/*------------------------------------------------------------------------- * * hba.c * Routines to handle host based authentication (that's the scheme * wherein you authenticate a user by seeing what IP address the system * says he comes from and choosing authentication method based on it). * * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * * IDENTIFICATION * src/backend/libpq/hba.c * *------------------------------------------------------------------------- */ #include "postgres.h" #include #include #include #include #include #include #include #include #include #include "catalog/pg_collation.h" #include "common/ip.h" #include "common/string.h" #include "libpq/hba.h" #include "libpq/ifaddr.h" #include "libpq/libpq-be.h" #include "libpq/oauth.h" #include "postmaster/postmaster.h" #include "regex/regex.h" #include "replication/walsender.h" #include "storage/fd.h" #include "utils/acl.h" #include "utils/conffiles.h" #include "utils/guc.h" #include "utils/memutils.h" #include "utils/varlena.h" #ifdef USE_LDAP #ifdef WIN32 #include #else #include #endif #endif /* callback data for check_network_callback */ typedef struct check_network_data { IPCompareMethod method; /* test method */ SockAddr *raddr; /* client's actual address */ bool result; /* set to true if match */ } check_network_data; typedef struct { const char *filename; int linenum; } tokenize_error_callback_arg; #define token_has_regexp(t) (t->regex != NULL) #define token_is_member_check(t) (!t->quoted && t->string[0] == '+') #define token_is_keyword(t, k) (!t->quoted && strcmp(t->string, k) == 0) #define token_matches(t, k) (strcmp(t->string, k) == 0) #define token_matches_insensitive(t,k) (pg_strcasecmp(t->string, k) == 0) /* * Memory context holding the list of TokenizedAuthLines when parsing * HBA or ident configuration files. This is created when opening the first * file (depth of CONF_FILE_START_DEPTH). */ static MemoryContext tokenize_context = NULL; /* * pre-parsed content of HBA config file: list of HbaLine structs. * parsed_hba_context is the memory context where it lives. */ static List *parsed_hba_lines = NIL; static MemoryContext parsed_hba_context = NULL; /* * pre-parsed content of ident mapping file: list of IdentLine structs. * parsed_ident_context is the memory context where it lives. */ static List *parsed_ident_lines = NIL; static MemoryContext parsed_ident_context = NULL; /* * The following character array represents the names of the authentication * methods that are supported by PostgreSQL. * * Note: keep this in sync with the UserAuth enum in hba.h. */ static const char *const UserAuthName[] = { "reject", "implicit reject", /* Not a user-visible option */ "trust", "ident", "password", "md5", "scram-sha-256", "gss", "sspi", "pam", "bsd", "ldap", "cert", "radius", "peer", "oauth", }; /* * Make sure UserAuthName[] tracks additions to the UserAuth enum */ StaticAssertDecl(lengthof(UserAuthName) == USER_AUTH_LAST + 1, "UserAuthName[] must match the UserAuth enum"); static List *tokenize_expand_file(List *tokens, const char *outer_filename, const char *inc_filename, int elevel, int depth, char **err_msg); static bool parse_hba_auth_opt(char *name, char *val, HbaLine *hbaline, int elevel, char **err_msg); static int regcomp_auth_token(AuthToken *token, char *filename, int line_num, char **err_msg, int elevel); static int regexec_auth_token(const char *match, AuthToken *token, size_t nmatch, regmatch_t pmatch[]); static void tokenize_error_callback(void *arg); /* * isblank() exists in the ISO C99 spec, but it's not very portable yet, * so provide our own version. */ bool pg_isblank(const char c) { return c == ' ' || c == '\t' || c == '\r'; } /* * Grab one token out of the string pointed to by *lineptr. * * Tokens are strings of non-blank characters bounded by blank characters, * commas, beginning of line, and end of line. Blank means space or tab. * * Tokens can be delimited by double quotes (this allows the inclusion of * commas, blanks, and '#', but not newlines). As in SQL, write two * double-quotes to represent a double quote. * * Comments (started by an unquoted '#') are skipped, i.e. the remainder * of the line is ignored. * * (Note that line continuation processing happens before tokenization. * Thus, if a continuation occurs within quoted text or a comment, the * quoted text or comment is considered to continue to the next line.) * * The token, if any, is returned into buf (replacing any previous * contents), and *lineptr is advanced past the token. * * Also, we set *initial_quote to indicate whether there was quoting before * the first character. (We use that to prevent "@x" from being treated * as a file inclusion request. Note that @"x" should be so treated; * we want to allow that to support embedded spaces in file paths.) * * We set *terminating_comma to indicate whether the token is terminated by a * comma (which is not returned, nor advanced over). * * The only possible error condition is lack of terminating quote, but we * currently do not detect that, but just return the rest of the line. * * If successful: store dequoted token in buf and return true. * If no more tokens on line: set buf to empty and return false. */ static bool next_token(char **lineptr, StringInfo buf, bool *initial_quote, bool *terminating_comma) { int c; bool in_quote = false; bool was_quote = false; bool saw_quote = false; /* Initialize output parameters */ resetStringInfo(buf); *initial_quote = false; *terminating_comma = false; /* Move over any whitespace and commas preceding the next token */ while ((c = (*(*lineptr)++)) != '\0' && (pg_isblank(c) || c == ',')) ; /* * Build a token in buf of next characters up to EOL, unquoted comma, or * unquoted whitespace. */ while (c != '\0' && (!pg_isblank(c) || in_quote)) { /* skip comments to EOL */ if (c == '#' && !in_quote) { while ((c = (*(*lineptr)++)) != '\0') ; break; } /* we do not pass back a terminating comma in the token */ if (c == ',' && !in_quote) { *terminating_comma = true; break; } if (c != '"' || was_quote) appendStringInfoChar(buf, c); /* Literal double-quote is two double-quotes */ if (in_quote && c == '"') was_quote = !was_quote; else was_quote = false; if (c == '"') { in_quote = !in_quote; saw_quote = true; if (buf->len == 0) *initial_quote = true; } c = *(*lineptr)++; } /* * Un-eat the char right after the token (critical in case it is '\0', * else next call will read past end of string). */ (*lineptr)--; return (saw_quote || buf->len > 0); } /* * Construct a palloc'd AuthToken struct, copying the given string. */ static AuthToken * make_auth_token(const char *token, bool quoted) { AuthToken *authtoken; int toklen; toklen = strlen(token); /* we copy string into same palloc block as the struct */ authtoken = (AuthToken *) palloc0(sizeof(AuthToken) + toklen + 1); authtoken->string = (char *) authtoken + sizeof(AuthToken); authtoken->quoted = quoted; authtoken->regex = NULL; memcpy(authtoken->string, token, toklen + 1); return authtoken; } /* * Free an AuthToken, that may include a regular expression that needs * to be cleaned up explicitly. */ static void free_auth_token(AuthToken *token) { if (token_has_regexp(token)) pg_regfree(token->regex); } /* * Copy a AuthToken struct into freshly palloc'd memory. */ static AuthToken * copy_auth_token(AuthToken *in) { AuthToken *out = make_auth_token(in->string, in->quoted); return out; } /* * Compile the regular expression and store it in the AuthToken given in * input. Returns the result of pg_regcomp(). On error, the details are * stored in "err_msg". */ static int regcomp_auth_token(AuthToken *token, char *filename, int line_num, char **err_msg, int elevel) { pg_wchar *wstr; int wlen; int rc; Assert(token->regex == NULL); if (token->string[0] != '/') return 0; /* nothing to compile */ token->regex = (regex_t *) palloc0(sizeof(regex_t)); wstr = palloc((strlen(token->string + 1) + 1) * sizeof(pg_wchar)); wlen = pg_mb2wchar_with_len(token->string + 1, wstr, strlen(token->string + 1)); rc = pg_regcomp(token->regex, wstr, wlen, REG_ADVANCED, C_COLLATION_OID); if (rc) { char errstr[100]; pg_regerror(rc, token->regex, errstr, sizeof(errstr)); ereport(elevel, (errcode(ERRCODE_INVALID_REGULAR_EXPRESSION), errmsg("invalid regular expression \"%s\": %s", token->string + 1, errstr), errcontext("line %d of configuration file \"%s\"", line_num, filename))); *err_msg = psprintf("invalid regular expression \"%s\": %s", token->string + 1, errstr); } pfree(wstr); return rc; } /* * Execute a regular expression computed in an AuthToken, checking for a match * with the string specified in "match". The caller may optionally give an * array to store the matches. Returns the result of pg_regexec(). */ static int regexec_auth_token(const char *match, AuthToken *token, size_t nmatch, regmatch_t pmatch[]) { pg_wchar *wmatchstr; int wmatchlen; int r; Assert(token->string[0] == '/' && token->regex); wmatchstr = palloc((strlen(match) + 1) * sizeof(pg_wchar)); wmatchlen = pg_mb2wchar_with_len(match, wmatchstr, strlen(match)); r = pg_regexec(token->regex, wmatchstr, wmatchlen, 0, NULL, nmatch, pmatch, 0); pfree(wmatchstr); return r; } /* * Tokenize one HBA field from a line, handling file inclusion and comma lists. * * filename: current file's pathname (needed to resolve relative pathnames) * *lineptr: current line pointer, which will be advanced past field * * In event of an error, log a message at ereport level elevel, and also * set *err_msg to a string describing the error. Note that the result * may be non-NIL anyway, so *err_msg must be tested to determine whether * there was an error. * * The result is a List of AuthToken structs, one for each token in the field, * or NIL if we reached EOL. */ static List * next_field_expand(const char *filename, char **lineptr, int elevel, int depth, char **err_msg) { StringInfoData buf; bool trailing_comma; bool initial_quote; List *tokens = NIL; initStringInfo(&buf); do { if (!next_token(lineptr, &buf, &initial_quote, &trailing_comma)) break; /* Is this referencing a file? */ if (!initial_quote && buf.len > 1 && buf.data[0] == '@') tokens = tokenize_expand_file(tokens, filename, buf.data + 1, elevel, depth + 1, err_msg); else { MemoryContext oldcxt; /* * lappend() may do its own allocations, so move to the context * for the list of tokens. */ oldcxt = MemoryContextSwitchTo(tokenize_context); tokens = lappend(tokens, make_auth_token(buf.data, initial_quote)); MemoryContextSwitchTo(oldcxt); } } while (trailing_comma && (*err_msg == NULL)); pfree(buf.data); return tokens; } /* * tokenize_include_file * Include a file from another file into an hba "field". * * Opens and tokenises a file included from another authentication file * with one of the include records ("include", "include_if_exists" or * "include_dir"), and assign all values found to an existing list of * list of AuthTokens. * * All new tokens are allocated in the memory context dedicated to the * tokenization, aka tokenize_context. * * If missing_ok is true, ignore a missing file. * * In event of an error, log a message at ereport level elevel, and also * set *err_msg to a string describing the error. Note that the result * may be non-NIL anyway, so *err_msg must be tested to determine whether * there was an error. */ static void tokenize_include_file(const char *outer_filename, const char *inc_filename, List **tok_lines, int elevel, int depth, bool missing_ok, char **err_msg) { char *inc_fullname; FILE *inc_file; inc_fullname = AbsoluteConfigLocation(inc_filename, outer_filename); inc_file = open_auth_file(inc_fullname, elevel, depth, err_msg); if (!inc_file) { if (errno == ENOENT && missing_ok) { ereport(elevel, (errmsg("skipping missing authentication file \"%s\"", inc_fullname))); *err_msg = NULL; pfree(inc_fullname); return; } /* error in err_msg, so leave and report */ pfree(inc_fullname); Assert(err_msg); return; } tokenize_auth_file(inc_fullname, inc_file, tok_lines, elevel, depth); free_auth_file(inc_file, depth); pfree(inc_fullname); } /* * tokenize_expand_file * Expand a file included from another file into an hba "field" * * Opens and tokenises a file included from another HBA config file with @, * and returns all values found therein as a flat list of AuthTokens. If a * @-token or include record is found, recursively expand it. The newly * read tokens are appended to "tokens" (so that foo,bar,@baz does what you * expect). All new tokens are allocated in the memory context dedicated * to the list of TokenizedAuthLines, aka tokenize_context. * * In event of an error, log a message at ereport level elevel, and also * set *err_msg to a string describing the error. Note that the result * may be non-NIL anyway, so *err_msg must be tested to determine whether * there was an error. */ static List * tokenize_expand_file(List *tokens, const char *outer_filename, const char *inc_filename, int elevel, int depth, char **err_msg) { char *inc_fullname; FILE *inc_file; List *inc_lines = NIL; ListCell *inc_line; inc_fullname = AbsoluteConfigLocation(inc_filename, outer_filename); inc_file = open_auth_file(inc_fullname, elevel, depth, err_msg); if (inc_file == NULL) { /* error already logged */ pfree(inc_fullname); return tokens; } /* * There is possible recursion here if the file contains @ or an include * record. */ tokenize_auth_file(inc_fullname, inc_file, &inc_lines, elevel, depth); pfree(inc_fullname); /* * Move all the tokens found in the file to the tokens list. These are * already saved in tokenize_context. */ foreach(inc_line, inc_lines) { TokenizedAuthLine *tok_line = (TokenizedAuthLine *) lfirst(inc_line); ListCell *inc_field; /* If any line has an error, propagate that up to caller */ if (tok_line->err_msg) { *err_msg = pstrdup(tok_line->err_msg); break; } foreach(inc_field, tok_line->fields) { List *inc_tokens = lfirst(inc_field); ListCell *inc_token; foreach(inc_token, inc_tokens) { AuthToken *token = lfirst(inc_token); MemoryContext oldcxt; /* * lappend() may do its own allocations, so move to the * context for the list of tokens. */ oldcxt = MemoryContextSwitchTo(tokenize_context); tokens = lappend(tokens, token); MemoryContextSwitchTo(oldcxt); } } } free_auth_file(inc_file, depth); return tokens; } /* * free_auth_file * Free a file opened by open_auth_file(). */ void free_auth_file(FILE *file, int depth) { FreeFile(file); /* If this is the last cleanup, remove the tokenization context */ if (depth == CONF_FILE_START_DEPTH) { MemoryContextDelete(tokenize_context); tokenize_context = NULL; } } /* * open_auth_file * Open the given file. * * filename: the absolute path to the target file * elevel: message logging level * depth: recursion level when opening the file * err_msg: details about the error * * Return value is the opened file. On error, returns NULL with details * about the error stored in "err_msg". */ FILE * open_auth_file(const char *filename, int elevel, int depth, char **err_msg) { FILE *file; /* * Reject too-deep include nesting depth. This is just a safety check to * avoid dumping core due to stack overflow if an include file loops back * to itself. The maximum nesting depth is pretty arbitrary. */ if (depth > CONF_FILE_MAX_DEPTH) { ereport(elevel, (errcode_for_file_access(), errmsg("could not open file \"%s\": maximum nesting depth exceeded", filename))); if (err_msg) *err_msg = psprintf("could not open file \"%s\": maximum nesting depth exceeded", filename); return NULL; } file = AllocateFile(filename, "r"); if (file == NULL) { int save_errno = errno; ereport(elevel, (errcode_for_file_access(), errmsg("could not open file \"%s\": %m", filename))); if (err_msg) { errno = save_errno; *err_msg = psprintf("could not open file \"%s\": %m", filename); } /* the caller may care about some specific errno */ errno = save_errno; return NULL; } /* * When opening the top-level file, create the memory context used for the * tokenization. This will be closed with this file when coming back to * this level of cleanup. */ if (depth == CONF_FILE_START_DEPTH) { /* * A context may be present, but assume that it has been eliminated * already. */ tokenize_context = AllocSetContextCreate(CurrentMemoryContext, "tokenize_context", ALLOCSET_START_SMALL_SIZES); } return file; } /* * error context callback for tokenize_auth_file() */ static void tokenize_error_callback(void *arg) { tokenize_error_callback_arg *callback_arg = (tokenize_error_callback_arg *) arg; errcontext("line %d of configuration file \"%s\"", callback_arg->linenum, callback_arg->filename); } /* * tokenize_auth_file * Tokenize the given file. * * The output is a list of TokenizedAuthLine structs; see the struct definition * in libpq/hba.h. This is the central piece in charge of parsing the * authentication files. All the operations of this function happen in its own * local memory context, easing the cleanup of anything allocated here. This * matters a lot when reloading authentication files in the postmaster. * * filename: the absolute path to the target file * file: the already-opened target file * tok_lines: receives output list, saved into tokenize_context * elevel: message logging level * depth: level of recursion when tokenizing the target file * * Errors are reported by logging messages at ereport level elevel and by * adding TokenizedAuthLine structs containing non-null err_msg fields to the * output list. */ void tokenize_auth_file(const char *filename, FILE *file, List **tok_lines, int elevel, int depth) { int line_number = 1; StringInfoData buf; MemoryContext linecxt; MemoryContext funccxt; /* context of this function's caller */ ErrorContextCallback tokenerrcontext; tokenize_error_callback_arg callback_arg; Assert(tokenize_context); callback_arg.filename = filename; callback_arg.linenum = line_number; tokenerrcontext.callback = tokenize_error_callback; tokenerrcontext.arg = &callback_arg; tokenerrcontext.previous = error_context_stack; error_context_stack = &tokenerrcontext; /* * Do all the local tokenization in its own context, to ease the cleanup * of any memory allocated while tokenizing. */ linecxt = AllocSetContextCreate(CurrentMemoryContext, "tokenize_auth_file", ALLOCSET_SMALL_SIZES); funccxt = MemoryContextSwitchTo(linecxt); initStringInfo(&buf); if (depth == CONF_FILE_START_DEPTH) *tok_lines = NIL; while (!feof(file) && !ferror(file)) { TokenizedAuthLine *tok_line; MemoryContext oldcxt; char *lineptr; List *current_line = NIL; char *err_msg = NULL; int last_backslash_buflen = 0; int continuations = 0; /* Collect the next input line, handling backslash continuations */ resetStringInfo(&buf); while (pg_get_line_append(file, &buf, NULL)) { /* Strip trailing newline, including \r in case we're on Windows */ buf.len = pg_strip_crlf(buf.data); /* * Check for backslash continuation. The backslash must be after * the last place we found a continuation, else two backslashes * followed by two \n's would behave surprisingly. */ if (buf.len > last_backslash_buflen && buf.data[buf.len - 1] == '\\') { /* Continuation, so strip it and keep reading */ buf.data[--buf.len] = '\0'; last_backslash_buflen = buf.len; continuations++; continue; } /* Nope, so we have the whole line */ break; } if (ferror(file)) { /* I/O error! */ int save_errno = errno; ereport(elevel, (errcode_for_file_access(), errmsg("could not read file \"%s\": %m", filename))); errno = save_errno; err_msg = psprintf("could not read file \"%s\": %m", filename); break; } /* Parse fields */ lineptr = buf.data; while (*lineptr && err_msg == NULL) { List *current_field; current_field = next_field_expand(filename, &lineptr, elevel, depth, &err_msg); /* add field to line, unless we are at EOL or comment start */ if (current_field != NIL) { /* * lappend() may do its own allocations, so move to the * context for the list of tokens. */ oldcxt = MemoryContextSwitchTo(tokenize_context); current_line = lappend(current_line, current_field); MemoryContextSwitchTo(oldcxt); } } /* * Reached EOL; no need to emit line to TokenizedAuthLine list if it's * boring. */ if (current_line == NIL && err_msg == NULL) goto next_line; /* If the line is valid, check if that's an include directive */ if (err_msg == NULL && list_length(current_line) == 2) { AuthToken *first, *second; first = linitial(linitial_node(List, current_line)); second = linitial(lsecond_node(List, current_line)); if (strcmp(first->string, "include") == 0) { tokenize_include_file(filename, second->string, tok_lines, elevel, depth + 1, false, &err_msg); if (err_msg) goto process_line; /* * tokenize_auth_file() has taken care of creating the * TokenizedAuthLines. */ goto next_line; } else if (strcmp(first->string, "include_dir") == 0) { char **filenames; char *dir_name = second->string; int num_filenames; StringInfoData err_buf; filenames = GetConfFilesInDir(dir_name, filename, elevel, &num_filenames, &err_msg); if (!filenames) { /* the error is in err_msg, so create an entry */ goto process_line; } initStringInfo(&err_buf); for (int i = 0; i < num_filenames; i++) { tokenize_include_file(filename, filenames[i], tok_lines, elevel, depth + 1, false, &err_msg); /* cumulate errors if any */ if (err_msg) { if (err_buf.len > 0) appendStringInfoChar(&err_buf, '\n'); appendStringInfoString(&err_buf, err_msg); } } /* clean up things */ for (int i = 0; i < num_filenames; i++) pfree(filenames[i]); pfree(filenames); /* * If there were no errors, the line is fully processed, * bypass the general TokenizedAuthLine processing. */ if (err_buf.len == 0) goto next_line; /* Otherwise, process the cumulated errors, if any. */ err_msg = err_buf.data; goto process_line; } else if (strcmp(first->string, "include_if_exists") == 0) { tokenize_include_file(filename, second->string, tok_lines, elevel, depth + 1, true, &err_msg); if (err_msg) goto process_line; /* * tokenize_auth_file() has taken care of creating the * TokenizedAuthLines. */ goto next_line; } } process_line: /* * General processing: report the error if any and emit line to the * TokenizedAuthLine. This is saved in the memory context dedicated * to this list. */ oldcxt = MemoryContextSwitchTo(tokenize_context); tok_line = (TokenizedAuthLine *) palloc0(sizeof(TokenizedAuthLine)); tok_line->fields = current_line; tok_line->file_name = pstrdup(filename); tok_line->line_num = line_number; tok_line->raw_line = pstrdup(buf.data); tok_line->err_msg = err_msg ? pstrdup(err_msg) : NULL; *tok_lines = lappend(*tok_lines, tok_line); MemoryContextSwitchTo(oldcxt); next_line: line_number += continuations + 1; callback_arg.linenum = line_number; } MemoryContextSwitchTo(funccxt); MemoryContextDelete(linecxt); error_context_stack = tokenerrcontext.previous; } /* * Does user belong to role? * * userid is the OID of the role given as the attempted login identifier. * We check to see if it is a member of the specified role name. */ static bool is_member(Oid userid, const char *role) { Oid roleid; if (!OidIsValid(userid)) return false; /* if user not exist, say "no" */ roleid = get_role_oid(role, true); if (!OidIsValid(roleid)) return false; /* if target role not exist, say "no" */ /* * See if user is directly or indirectly a member of role. For this * purpose, a superuser is not considered to be automatically a member of * the role, so group auth only applies to explicit membership. */ return is_member_of_role_nosuper(userid, roleid); } /* * Check AuthToken list for a match to role, allowing group names. * * Each AuthToken listed is checked one-by-one. Keywords are processed * first (these cannot have regular expressions), followed by regular * expressions (if any), the case-insensitive match (if requested) and * the exact match. */ static bool check_role(const char *role, Oid roleid, List *tokens, bool case_insensitive) { ListCell *cell; AuthToken *tok; foreach(cell, tokens) { tok = lfirst(cell); if (token_is_member_check(tok)) { if (is_member(roleid, tok->string + 1)) return true; } else if (token_is_keyword(tok, "all")) return true; else if (token_has_regexp(tok)) { if (regexec_auth_token(role, tok, 0, NULL) == REG_OKAY) return true; } else if (case_insensitive) { if (token_matches_insensitive(tok, role)) return true; } else if (token_matches(tok, role)) return true; } return false; } /* * Check to see if db/role combination matches AuthToken list. * * Each AuthToken listed is checked one-by-one. Keywords are checked * first (these cannot have regular expressions), followed by regular * expressions (if any) and the exact match. */ static bool check_db(const char *dbname, const char *role, Oid roleid, List *tokens) { ListCell *cell; AuthToken *tok; foreach(cell, tokens) { tok = lfirst(cell); if (am_walsender && !am_db_walsender) { /* * physical replication walsender connections can only match * replication keyword */ if (token_is_keyword(tok, "replication")) return true; } else if (token_is_keyword(tok, "all")) return true; else if (token_is_keyword(tok, "sameuser")) { if (strcmp(dbname, role) == 0) return true; } else if (token_is_keyword(tok, "samegroup") || token_is_keyword(tok, "samerole")) { if (is_member(roleid, dbname)) return true; } else if (token_is_keyword(tok, "replication")) continue; /* never match this if not walsender */ else if (token_has_regexp(tok)) { if (regexec_auth_token(dbname, tok, 0, NULL) == REG_OKAY) return true; } else if (token_matches(tok, dbname)) return true; } return false; } static bool ipv4eq(struct sockaddr_in *a, struct sockaddr_in *b) { return (a->sin_addr.s_addr == b->sin_addr.s_addr); } static bool ipv6eq(struct sockaddr_in6 *a, struct sockaddr_in6 *b) { int i; for (i = 0; i < 16; i++) if (a->sin6_addr.s6_addr[i] != b->sin6_addr.s6_addr[i]) return false; return true; } /* * Check whether host name matches pattern. */ static bool hostname_match(const char *pattern, const char *actual_hostname) { if (pattern[0] == '.') /* suffix match */ { size_t plen = strlen(pattern); size_t hlen = strlen(actual_hostname); if (hlen < plen) return false; return (pg_strcasecmp(pattern, actual_hostname + (hlen - plen)) == 0); } else return (pg_strcasecmp(pattern, actual_hostname) == 0); } /* * Check to see if a connecting IP matches a given host name. */ static bool check_hostname(hbaPort *port, const char *hostname) { struct addrinfo *gai_result, *gai; int ret; bool found; /* Quick out if remote host name already known bad */ if (port->remote_hostname_resolv < 0) return false; /* Lookup remote host name if not already done */ if (!port->remote_hostname) { char remote_hostname[NI_MAXHOST]; ret = pg_getnameinfo_all(&port->raddr.addr, port->raddr.salen, remote_hostname, sizeof(remote_hostname), NULL, 0, NI_NAMEREQD); if (ret != 0) { /* remember failure; don't complain in the postmaster log yet */ port->remote_hostname_resolv = -2; port->remote_hostname_errcode = ret; return false; } port->remote_hostname = pstrdup(remote_hostname); } /* Now see if remote host name matches this pg_hba line */ if (!hostname_match(hostname, port->remote_hostname)) return false; /* If we already verified the forward lookup, we're done */ if (port->remote_hostname_resolv == +1) return true; /* Lookup IP from host name and check against original IP */ ret = getaddrinfo(port->remote_hostname, NULL, NULL, &gai_result); if (ret != 0) { /* remember failure; don't complain in the postmaster log yet */ port->remote_hostname_resolv = -2; port->remote_hostname_errcode = ret; return false; } found = false; for (gai = gai_result; gai; gai = gai->ai_next) { if (gai->ai_addr->sa_family == port->raddr.addr.ss_family) { if (gai->ai_addr->sa_family == AF_INET) { if (ipv4eq((struct sockaddr_in *) gai->ai_addr, (struct sockaddr_in *) &port->raddr.addr)) { found = true; break; } } else if (gai->ai_addr->sa_family == AF_INET6) { if (ipv6eq((struct sockaddr_in6 *) gai->ai_addr, (struct sockaddr_in6 *) &port->raddr.addr)) { found = true; break; } } } } if (gai_result) freeaddrinfo(gai_result); if (!found) elog(DEBUG2, "pg_hba.conf host name \"%s\" rejected because address resolution did not return a match with IP address of client", hostname); port->remote_hostname_resolv = found ? +1 : -1; return found; } /* * Check to see if a connecting IP matches the given address and netmask. */ static bool check_ip(SockAddr *raddr, struct sockaddr *addr, struct sockaddr *mask) { if (raddr->addr.ss_family == addr->sa_family && pg_range_sockaddr(&raddr->addr, (struct sockaddr_storage *) addr, (struct sockaddr_storage *) mask)) return true; return false; } /* * pg_foreach_ifaddr callback: does client addr match this machine interface? */ static void check_network_callback(struct sockaddr *addr, struct sockaddr *netmask, void *cb_data) { check_network_data *cn = (check_network_data *) cb_data; struct sockaddr_storage mask; /* Already found a match? */ if (cn->result) return; if (cn->method == ipCmpSameHost) { /* Make an all-ones netmask of appropriate length for family */ pg_sockaddr_cidr_mask(&mask, NULL, addr->sa_family); cn->result = check_ip(cn->raddr, addr, (struct sockaddr *) &mask); } else { /* Use the netmask of the interface itself */ cn->result = check_ip(cn->raddr, addr, netmask); } } /* * Use pg_foreach_ifaddr to check a samehost or samenet match */ static bool check_same_host_or_net(SockAddr *raddr, IPCompareMethod method) { check_network_data cn; cn.method = method; cn.raddr = raddr; cn.result = false; errno = 0; if (pg_foreach_ifaddr(check_network_callback, &cn) < 0) { ereport(LOG, (errmsg("error enumerating network interfaces: %m"))); return false; } return cn.result; } /* * Macros used to check and report on invalid configuration options. * On error: log a message at level elevel, set *err_msg, and exit the function. * These macros are not as general-purpose as they look, because they know * what the calling function's error-exit value is. * * INVALID_AUTH_OPTION = reports when an option is specified for a method where it's * not supported. * REQUIRE_AUTH_OPTION = same as INVALID_AUTH_OPTION, except it also checks if the * method is actually the one specified. Used as a shortcut when * the option is only valid for one authentication method. * MANDATORY_AUTH_ARG = check if a required option is set for an authentication method, * reporting error if it's not. */ #define INVALID_AUTH_OPTION(optname, validmethods) \ do { \ ereport(elevel, \ (errcode(ERRCODE_CONFIG_FILE_ERROR), \ /* translator: the second %s is a list of auth methods */ \ errmsg("authentication option \"%s\" is only valid for authentication methods %s", \ optname, _(validmethods)), \ errcontext("line %d of configuration file \"%s\"", \ line_num, file_name))); \ *err_msg = psprintf("authentication option \"%s\" is only valid for authentication methods %s", \ optname, validmethods); \ return false; \ } while (0) #define REQUIRE_AUTH_OPTION(methodval, optname, validmethods) \ do { \ if (hbaline->auth_method != methodval) \ INVALID_AUTH_OPTION(optname, validmethods); \ } while (0) #define MANDATORY_AUTH_ARG(argvar, argname, authname) \ do { \ if (argvar == NULL) { \ ereport(elevel, \ (errcode(ERRCODE_CONFIG_FILE_ERROR), \ errmsg("authentication method \"%s\" requires argument \"%s\" to be set", \ authname, argname), \ errcontext("line %d of configuration file \"%s\"", \ line_num, file_name))); \ *err_msg = psprintf("authentication method \"%s\" requires argument \"%s\" to be set", \ authname, argname); \ return NULL; \ } \ } while (0) /* * Macros for handling pg_ident problems, similar as above. * * IDENT_FIELD_ABSENT: * Reports when the given ident field ListCell is not populated. * * IDENT_MULTI_VALUE: * Reports when the given ident token List has more than one element. */ #define IDENT_FIELD_ABSENT(field) \ do { \ if (!field) { \ ereport(elevel, \ (errcode(ERRCODE_CONFIG_FILE_ERROR), \ errmsg("missing entry at end of line"), \ errcontext("line %d of configuration file \"%s\"", \ line_num, file_name))); \ *err_msg = pstrdup("missing entry at end of line"); \ return NULL; \ } \ } while (0) #define IDENT_MULTI_VALUE(tokens) \ do { \ if (tokens->length > 1) { \ ereport(elevel, \ (errcode(ERRCODE_CONFIG_FILE_ERROR), \ errmsg("multiple values in ident field"), \ errcontext("line %d of configuration file \"%s\"", \ line_num, file_name))); \ *err_msg = pstrdup("multiple values in ident field"); \ return NULL; \ } \ } while (0) /* * Parse one tokenised line from the hba config file and store the result in a * HbaLine structure. * * If parsing fails, log a message at ereport level elevel, store an error * string in tok_line->err_msg, and return NULL. (Some non-error conditions * can also result in such messages.) * * Note: this function leaks memory when an error occurs. Caller is expected * to have set a memory context that will be reset if this function returns * NULL. */ HbaLine * parse_hba_line(TokenizedAuthLine *tok_line, int elevel) { int line_num = tok_line->line_num; char *file_name = tok_line->file_name; char **err_msg = &tok_line->err_msg; char *str; struct addrinfo *gai_result; struct addrinfo hints; int ret; char *cidr_slash; char *unsupauth; ListCell *field; List *tokens; ListCell *tokencell; AuthToken *token; HbaLine *parsedline; parsedline = palloc0(sizeof(HbaLine)); parsedline->sourcefile = pstrdup(file_name); parsedline->linenumber = line_num; parsedline->rawline = pstrdup(tok_line->raw_line); /* Check the record type. */ Assert(tok_line->fields != NIL); field = list_head(tok_line->fields); tokens = lfirst(field); if (tokens->length > 1) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("multiple values specified for connection type"), errhint("Specify exactly one connection type per line."), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "multiple values specified for connection type"; return NULL; } token = linitial(tokens); if (strcmp(token->string, "local") == 0) { parsedline->conntype = ctLocal; } else if (strcmp(token->string, "host") == 0 || strcmp(token->string, "hostssl") == 0 || strcmp(token->string, "hostnossl") == 0 || strcmp(token->string, "hostgssenc") == 0 || strcmp(token->string, "hostnogssenc") == 0) { if (token->string[4] == 's') /* "hostssl" */ { parsedline->conntype = ctHostSSL; /* Log a warning if SSL support is not active */ #ifdef USE_SSL if (!EnableSSL) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("hostssl record cannot match because SSL is disabled"), errhint("Set \"ssl = on\" in postgresql.conf."), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "hostssl record cannot match because SSL is disabled"; } #else ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("hostssl record cannot match because SSL is not supported by this build"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "hostssl record cannot match because SSL is not supported by this build"; #endif } else if (token->string[4] == 'g') /* "hostgssenc" */ { parsedline->conntype = ctHostGSS; #ifndef ENABLE_GSS ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("hostgssenc record cannot match because GSSAPI is not supported by this build"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "hostgssenc record cannot match because GSSAPI is not supported by this build"; #endif } else if (token->string[4] == 'n' && token->string[6] == 's') parsedline->conntype = ctHostNoSSL; else if (token->string[4] == 'n' && token->string[6] == 'g') parsedline->conntype = ctHostNoGSS; else { /* "host" */ parsedline->conntype = ctHost; } } /* record type */ else { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid connection type \"%s\"", token->string), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("invalid connection type \"%s\"", token->string); return NULL; } /* Get the databases. */ field = lnext(tok_line->fields, field); if (!field) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("end-of-line before database specification"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "end-of-line before database specification"; return NULL; } parsedline->databases = NIL; tokens = lfirst(field); foreach(tokencell, tokens) { AuthToken *tok = copy_auth_token(lfirst(tokencell)); /* Compile a regexp for the database token, if necessary */ if (regcomp_auth_token(tok, file_name, line_num, err_msg, elevel)) return NULL; parsedline->databases = lappend(parsedline->databases, tok); } /* Get the roles. */ field = lnext(tok_line->fields, field); if (!field) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("end-of-line before role specification"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "end-of-line before role specification"; return NULL; } parsedline->roles = NIL; tokens = lfirst(field); foreach(tokencell, tokens) { AuthToken *tok = copy_auth_token(lfirst(tokencell)); /* Compile a regexp from the role token, if necessary */ if (regcomp_auth_token(tok, file_name, line_num, err_msg, elevel)) return NULL; parsedline->roles = lappend(parsedline->roles, tok); } if (parsedline->conntype != ctLocal) { /* Read the IP address field. (with or without CIDR netmask) */ field = lnext(tok_line->fields, field); if (!field) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("end-of-line before IP address specification"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "end-of-line before IP address specification"; return NULL; } tokens = lfirst(field); if (tokens->length > 1) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("multiple values specified for host address"), errhint("Specify one address range per line."), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "multiple values specified for host address"; return NULL; } token = linitial(tokens); if (token_is_keyword(token, "all")) { parsedline->ip_cmp_method = ipCmpAll; } else if (token_is_keyword(token, "samehost")) { /* Any IP on this host is allowed to connect */ parsedline->ip_cmp_method = ipCmpSameHost; } else if (token_is_keyword(token, "samenet")) { /* Any IP on the host's subnets is allowed to connect */ parsedline->ip_cmp_method = ipCmpSameNet; } else { /* IP and netmask are specified */ parsedline->ip_cmp_method = ipCmpMask; /* need a modifiable copy of token */ str = pstrdup(token->string); /* Check if it has a CIDR suffix and if so isolate it */ cidr_slash = strchr(str, '/'); if (cidr_slash) *cidr_slash = '\0'; /* Get the IP address either way */ hints.ai_flags = AI_NUMERICHOST; hints.ai_family = AF_UNSPEC; hints.ai_socktype = 0; hints.ai_protocol = 0; hints.ai_addrlen = 0; hints.ai_canonname = NULL; hints.ai_addr = NULL; hints.ai_next = NULL; ret = pg_getaddrinfo_all(str, NULL, &hints, &gai_result); if (ret == 0 && gai_result) { memcpy(&parsedline->addr, gai_result->ai_addr, gai_result->ai_addrlen); parsedline->addrlen = gai_result->ai_addrlen; } else if (ret == EAI_NONAME) parsedline->hostname = str; else { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid IP address \"%s\": %s", str, gai_strerror(ret)), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("invalid IP address \"%s\": %s", str, gai_strerror(ret)); if (gai_result) pg_freeaddrinfo_all(hints.ai_family, gai_result); return NULL; } pg_freeaddrinfo_all(hints.ai_family, gai_result); /* Get the netmask */ if (cidr_slash) { if (parsedline->hostname) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("specifying both host name and CIDR mask is invalid: \"%s\"", token->string), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("specifying both host name and CIDR mask is invalid: \"%s\"", token->string); return NULL; } if (pg_sockaddr_cidr_mask(&parsedline->mask, cidr_slash + 1, parsedline->addr.ss_family) < 0) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid CIDR mask in address \"%s\"", token->string), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("invalid CIDR mask in address \"%s\"", token->string); return NULL; } parsedline->masklen = parsedline->addrlen; pfree(str); } else if (!parsedline->hostname) { /* Read the mask field. */ pfree(str); field = lnext(tok_line->fields, field); if (!field) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("end-of-line before netmask specification"), errhint("Specify an address range in CIDR notation, or provide a separate netmask."), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "end-of-line before netmask specification"; return NULL; } tokens = lfirst(field); if (tokens->length > 1) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("multiple values specified for netmask"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "multiple values specified for netmask"; return NULL; } token = linitial(tokens); ret = pg_getaddrinfo_all(token->string, NULL, &hints, &gai_result); if (ret || !gai_result) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid IP mask \"%s\": %s", token->string, gai_strerror(ret)), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("invalid IP mask \"%s\": %s", token->string, gai_strerror(ret)); if (gai_result) pg_freeaddrinfo_all(hints.ai_family, gai_result); return NULL; } memcpy(&parsedline->mask, gai_result->ai_addr, gai_result->ai_addrlen); parsedline->masklen = gai_result->ai_addrlen; pg_freeaddrinfo_all(hints.ai_family, gai_result); if (parsedline->addr.ss_family != parsedline->mask.ss_family) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("IP address and mask do not match"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "IP address and mask do not match"; return NULL; } } } } /* != ctLocal */ /* Get the authentication method */ field = lnext(tok_line->fields, field); if (!field) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("end-of-line before authentication method"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "end-of-line before authentication method"; return NULL; } tokens = lfirst(field); if (tokens->length > 1) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("multiple values specified for authentication type"), errhint("Specify exactly one authentication type per line."), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "multiple values specified for authentication type"; return NULL; } token = linitial(tokens); unsupauth = NULL; if (strcmp(token->string, "trust") == 0) parsedline->auth_method = uaTrust; else if (strcmp(token->string, "ident") == 0) parsedline->auth_method = uaIdent; else if (strcmp(token->string, "peer") == 0) parsedline->auth_method = uaPeer; else if (strcmp(token->string, "password") == 0) parsedline->auth_method = uaPassword; else if (strcmp(token->string, "gss") == 0) #ifdef ENABLE_GSS parsedline->auth_method = uaGSS; #else unsupauth = "gss"; #endif else if (strcmp(token->string, "sspi") == 0) #ifdef ENABLE_SSPI parsedline->auth_method = uaSSPI; #else unsupauth = "sspi"; #endif else if (strcmp(token->string, "reject") == 0) parsedline->auth_method = uaReject; else if (strcmp(token->string, "md5") == 0) parsedline->auth_method = uaMD5; else if (strcmp(token->string, "scram-sha-256") == 0) parsedline->auth_method = uaSCRAM; else if (strcmp(token->string, "pam") == 0) #ifdef USE_PAM parsedline->auth_method = uaPAM; #else unsupauth = "pam"; #endif else if (strcmp(token->string, "bsd") == 0) #ifdef USE_BSD_AUTH parsedline->auth_method = uaBSD; #else unsupauth = "bsd"; #endif else if (strcmp(token->string, "ldap") == 0) #ifdef USE_LDAP parsedline->auth_method = uaLDAP; #else unsupauth = "ldap"; #endif else if (strcmp(token->string, "cert") == 0) #ifdef USE_SSL parsedline->auth_method = uaCert; #else unsupauth = "cert"; #endif else if (strcmp(token->string, "radius") == 0) parsedline->auth_method = uaRADIUS; else if (strcmp(token->string, "oauth") == 0) parsedline->auth_method = uaOAuth; else { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid authentication method \"%s\"", token->string), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("invalid authentication method \"%s\"", token->string); return NULL; } if (unsupauth) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid authentication method \"%s\": not supported by this build", token->string), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("invalid authentication method \"%s\": not supported by this build", token->string); return NULL; } /* * XXX: When using ident on local connections, change it to peer, for * backwards compatibility. */ if (parsedline->conntype == ctLocal && parsedline->auth_method == uaIdent) parsedline->auth_method = uaPeer; /* Invalid authentication combinations */ if (parsedline->conntype == ctLocal && parsedline->auth_method == uaGSS) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("gssapi authentication is not supported on local sockets"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "gssapi authentication is not supported on local sockets"; return NULL; } if (parsedline->conntype != ctLocal && parsedline->auth_method == uaPeer) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("peer authentication is only supported on local sockets"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "peer authentication is only supported on local sockets"; return NULL; } /* * SSPI authentication can never be enabled on ctLocal connections, * because it's only supported on Windows, where ctLocal isn't supported. */ if (parsedline->conntype != ctHostSSL && parsedline->auth_method == uaCert) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("cert authentication is only supported on hostssl connections"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "cert authentication is only supported on hostssl connections"; return NULL; } /* * For GSS and SSPI, set the default value of include_realm to true. * Having include_realm set to false is dangerous in multi-realm * situations and is generally considered bad practice. We keep the * capability around for backwards compatibility, but we might want to * remove it at some point in the future. Users who still need to strip * the realm off would be better served by using an appropriate regex in a * pg_ident.conf mapping. */ if (parsedline->auth_method == uaGSS || parsedline->auth_method == uaSSPI) parsedline->include_realm = true; /* * For SSPI, include_realm defaults to the SAM-compatible domain (aka * NetBIOS name) and user names instead of the Kerberos principal name for * compatibility. */ if (parsedline->auth_method == uaSSPI) { parsedline->compat_realm = true; parsedline->upn_username = false; } /* Parse remaining arguments */ while ((field = lnext(tok_line->fields, field)) != NULL) { tokens = lfirst(field); foreach(tokencell, tokens) { char *val; token = lfirst(tokencell); str = pstrdup(token->string); val = strchr(str, '='); if (val == NULL) { /* * Got something that's not a name=value pair. */ ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("authentication option not in name=value format: %s", token->string), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("authentication option not in name=value format: %s", token->string); return NULL; } *val++ = '\0'; /* str now holds "name", val holds "value" */ if (!parse_hba_auth_opt(str, val, parsedline, elevel, err_msg)) /* parse_hba_auth_opt already logged the error message */ return NULL; pfree(str); } } /* * Check if the selected authentication method has any mandatory arguments * that are not set. */ if (parsedline->auth_method == uaLDAP) { #ifndef HAVE_LDAP_INITIALIZE /* Not mandatory for OpenLDAP, because it can use DNS SRV records */ MANDATORY_AUTH_ARG(parsedline->ldapserver, "ldapserver", "ldap"); #endif /* * LDAP can operate in two modes: either with a direct bind, using * ldapprefix and ldapsuffix, or using a search+bind, using * ldapbasedn, ldapbinddn, ldapbindpasswd and one of * ldapsearchattribute or ldapsearchfilter. Disallow mixing these * parameters. */ if (parsedline->ldapprefix || parsedline->ldapsuffix) { if (parsedline->ldapbasedn || parsedline->ldapbinddn || parsedline->ldapbindpasswd || parsedline->ldapsearchattribute || parsedline->ldapsearchfilter) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("cannot mix options for simple bind and search+bind modes"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "cannot mix options for simple bind and search+bind modes"; return NULL; } } else if (!parsedline->ldapbasedn) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("authentication method \"ldap\" requires argument \"ldapbasedn\", \"ldapprefix\", or \"ldapsuffix\" to be set"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "authentication method \"ldap\" requires argument \"ldapbasedn\", \"ldapprefix\", or \"ldapsuffix\" to be set"; return NULL; } /* * When using search+bind, you can either use a simple attribute * (defaulting to "uid") or a fully custom search filter. You can't * do both. */ if (parsedline->ldapsearchattribute && parsedline->ldapsearchfilter) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("cannot use ldapsearchattribute together with ldapsearchfilter"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "cannot use ldapsearchattribute together with ldapsearchfilter"; return NULL; } } if (parsedline->auth_method == uaRADIUS) { MANDATORY_AUTH_ARG(parsedline->radiusservers, "radiusservers", "radius"); MANDATORY_AUTH_ARG(parsedline->radiussecrets, "radiussecrets", "radius"); if (parsedline->radiusservers == NIL) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("list of RADIUS servers cannot be empty"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "list of RADIUS servers cannot be empty"; return NULL; } if (parsedline->radiussecrets == NIL) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("list of RADIUS secrets cannot be empty"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "list of RADIUS secrets cannot be empty"; return NULL; } /* * Verify length of option lists - each can be 0 (except for secrets, * but that's already checked above), 1 (use the same value * everywhere) or the same as the number of servers. */ if (!(list_length(parsedline->radiussecrets) == 1 || list_length(parsedline->radiussecrets) == list_length(parsedline->radiusservers))) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("the number of RADIUS secrets (%d) must be 1 or the same as the number of RADIUS servers (%d)", list_length(parsedline->radiussecrets), list_length(parsedline->radiusservers)), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("the number of RADIUS secrets (%d) must be 1 or the same as the number of RADIUS servers (%d)", list_length(parsedline->radiussecrets), list_length(parsedline->radiusservers)); return NULL; } if (!(list_length(parsedline->radiusports) == 0 || list_length(parsedline->radiusports) == 1 || list_length(parsedline->radiusports) == list_length(parsedline->radiusservers))) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("the number of RADIUS ports (%d) must be 1 or the same as the number of RADIUS servers (%d)", list_length(parsedline->radiusports), list_length(parsedline->radiusservers)), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("the number of RADIUS ports (%d) must be 1 or the same as the number of RADIUS servers (%d)", list_length(parsedline->radiusports), list_length(parsedline->radiusservers)); return NULL; } if (!(list_length(parsedline->radiusidentifiers) == 0 || list_length(parsedline->radiusidentifiers) == 1 || list_length(parsedline->radiusidentifiers) == list_length(parsedline->radiusservers))) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("the number of RADIUS identifiers (%d) must be 1 or the same as the number of RADIUS servers (%d)", list_length(parsedline->radiusidentifiers), list_length(parsedline->radiusservers)), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("the number of RADIUS identifiers (%d) must be 1 or the same as the number of RADIUS servers (%d)", list_length(parsedline->radiusidentifiers), list_length(parsedline->radiusservers)); return NULL; } } /* * Enforce any parameters implied by other settings. */ if (parsedline->auth_method == uaCert) { /* * For auth method cert, client certificate validation is mandatory, * and it implies the level of verify-full. */ parsedline->clientcert = clientCertFull; } /* * Enforce proper configuration of OAuth authentication. */ if (parsedline->auth_method == uaOAuth) { MANDATORY_AUTH_ARG(parsedline->oauth_scope, "scope", "oauth"); MANDATORY_AUTH_ARG(parsedline->oauth_issuer, "issuer", "oauth"); /* Ensure a validator library is set and permitted by the config. */ if (!check_oauth_validator(parsedline, elevel, err_msg)) return NULL; /* * Supplying a usermap combined with the option to skip usermapping is * nonsensical and indicates a configuration error. */ if (parsedline->oauth_skip_usermap && parsedline->usermap != NULL) { ereport(elevel, errcode(ERRCODE_CONFIG_FILE_ERROR), /* translator: strings are replaced with hba options */ errmsg("%s cannot be used in combination with %s", "map", "delegate_ident_mapping"), errcontext("line %d of configuration file \"%s\"", line_num, file_name)); *err_msg = "map cannot be used in combination with delegate_ident_mapping"; return NULL; } } return parsedline; } /* * Parse one name-value pair as an authentication option into the given * HbaLine. Return true if we successfully parse the option, false if we * encounter an error. In the event of an error, also log a message at * ereport level elevel, and store a message string into *err_msg. */ static bool parse_hba_auth_opt(char *name, char *val, HbaLine *hbaline, int elevel, char **err_msg) { int line_num = hbaline->linenumber; char *file_name = hbaline->sourcefile; #ifdef USE_LDAP hbaline->ldapscope = LDAP_SCOPE_SUBTREE; #endif if (strcmp(name, "map") == 0) { if (hbaline->auth_method != uaIdent && hbaline->auth_method != uaPeer && hbaline->auth_method != uaGSS && hbaline->auth_method != uaSSPI && hbaline->auth_method != uaCert && hbaline->auth_method != uaOAuth) INVALID_AUTH_OPTION("map", gettext_noop("ident, peer, gssapi, sspi, cert, and oauth")); hbaline->usermap = pstrdup(val); } else if (strcmp(name, "clientcert") == 0) { if (hbaline->conntype != ctHostSSL) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("clientcert can only be configured for \"hostssl\" rows"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "clientcert can only be configured for \"hostssl\" rows"; return false; } if (strcmp(val, "verify-full") == 0) { hbaline->clientcert = clientCertFull; } else if (strcmp(val, "verify-ca") == 0) { if (hbaline->auth_method == uaCert) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("clientcert only accepts \"verify-full\" when using \"cert\" authentication"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "clientcert can only be set to \"verify-full\" when using \"cert\" authentication"; return false; } hbaline->clientcert = clientCertCA; } else { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid value for clientcert: \"%s\"", val), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); return false; } } else if (strcmp(name, "clientname") == 0) { if (hbaline->conntype != ctHostSSL) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("clientname can only be configured for \"hostssl\" rows"), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = "clientname can only be configured for \"hostssl\" rows"; return false; } if (strcmp(val, "CN") == 0) { hbaline->clientcertname = clientCertCN; } else if (strcmp(val, "DN") == 0) { hbaline->clientcertname = clientCertDN; } else { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid value for clientname: \"%s\"", val), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); return false; } } else if (strcmp(name, "pamservice") == 0) { REQUIRE_AUTH_OPTION(uaPAM, "pamservice", "pam"); hbaline->pamservice = pstrdup(val); } else if (strcmp(name, "pam_use_hostname") == 0) { REQUIRE_AUTH_OPTION(uaPAM, "pam_use_hostname", "pam"); if (strcmp(val, "1") == 0) hbaline->pam_use_hostname = true; else hbaline->pam_use_hostname = false; } else if (strcmp(name, "ldapurl") == 0) { #ifdef LDAP_API_FEATURE_X_OPENLDAP LDAPURLDesc *urldata; int rc; #endif REQUIRE_AUTH_OPTION(uaLDAP, "ldapurl", "ldap"); #ifdef LDAP_API_FEATURE_X_OPENLDAP rc = ldap_url_parse(val, &urldata); if (rc != LDAP_SUCCESS) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("could not parse LDAP URL \"%s\": %s", val, ldap_err2string(rc)))); *err_msg = psprintf("could not parse LDAP URL \"%s\": %s", val, ldap_err2string(rc)); return false; } if (strcmp(urldata->lud_scheme, "ldap") != 0 && strcmp(urldata->lud_scheme, "ldaps") != 0) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("unsupported LDAP URL scheme: %s", urldata->lud_scheme))); *err_msg = psprintf("unsupported LDAP URL scheme: %s", urldata->lud_scheme); ldap_free_urldesc(urldata); return false; } if (urldata->lud_scheme) hbaline->ldapscheme = pstrdup(urldata->lud_scheme); if (urldata->lud_host) hbaline->ldapserver = pstrdup(urldata->lud_host); hbaline->ldapport = urldata->lud_port; if (urldata->lud_dn) hbaline->ldapbasedn = pstrdup(urldata->lud_dn); if (urldata->lud_attrs) hbaline->ldapsearchattribute = pstrdup(urldata->lud_attrs[0]); /* only use first one */ hbaline->ldapscope = urldata->lud_scope; if (urldata->lud_filter) hbaline->ldapsearchfilter = pstrdup(urldata->lud_filter); ldap_free_urldesc(urldata); #else /* not OpenLDAP */ ereport(elevel, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("LDAP URLs not supported on this platform"))); *err_msg = "LDAP URLs not supported on this platform"; #endif /* not OpenLDAP */ } else if (strcmp(name, "ldaptls") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldaptls", "ldap"); if (strcmp(val, "1") == 0) hbaline->ldaptls = true; else hbaline->ldaptls = false; } else if (strcmp(name, "ldapscheme") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapscheme", "ldap"); if (strcmp(val, "ldap") != 0 && strcmp(val, "ldaps") != 0) ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid ldapscheme value: \"%s\"", val), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); hbaline->ldapscheme = pstrdup(val); } else if (strcmp(name, "ldapserver") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapserver", "ldap"); hbaline->ldapserver = pstrdup(val); } else if (strcmp(name, "ldapport") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapport", "ldap"); hbaline->ldapport = atoi(val); if (hbaline->ldapport == 0) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid LDAP port number: \"%s\"", val), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("invalid LDAP port number: \"%s\"", val); return false; } } else if (strcmp(name, "ldapbinddn") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapbinddn", "ldap"); hbaline->ldapbinddn = pstrdup(val); } else if (strcmp(name, "ldapbindpasswd") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapbindpasswd", "ldap"); hbaline->ldapbindpasswd = pstrdup(val); } else if (strcmp(name, "ldapsearchattribute") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapsearchattribute", "ldap"); hbaline->ldapsearchattribute = pstrdup(val); } else if (strcmp(name, "ldapsearchfilter") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapsearchfilter", "ldap"); hbaline->ldapsearchfilter = pstrdup(val); } else if (strcmp(name, "ldapbasedn") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapbasedn", "ldap"); hbaline->ldapbasedn = pstrdup(val); } else if (strcmp(name, "ldapprefix") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapprefix", "ldap"); hbaline->ldapprefix = pstrdup(val); } else if (strcmp(name, "ldapsuffix") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapsuffix", "ldap"); hbaline->ldapsuffix = pstrdup(val); } else if (strcmp(name, "krb_realm") == 0) { if (hbaline->auth_method != uaGSS && hbaline->auth_method != uaSSPI) INVALID_AUTH_OPTION("krb_realm", gettext_noop("gssapi and sspi")); hbaline->krb_realm = pstrdup(val); } else if (strcmp(name, "include_realm") == 0) { if (hbaline->auth_method != uaGSS && hbaline->auth_method != uaSSPI) INVALID_AUTH_OPTION("include_realm", gettext_noop("gssapi and sspi")); if (strcmp(val, "1") == 0) hbaline->include_realm = true; else hbaline->include_realm = false; } else if (strcmp(name, "compat_realm") == 0) { if (hbaline->auth_method != uaSSPI) INVALID_AUTH_OPTION("compat_realm", gettext_noop("sspi")); if (strcmp(val, "1") == 0) hbaline->compat_realm = true; else hbaline->compat_realm = false; } else if (strcmp(name, "upn_username") == 0) { if (hbaline->auth_method != uaSSPI) INVALID_AUTH_OPTION("upn_username", gettext_noop("sspi")); if (strcmp(val, "1") == 0) hbaline->upn_username = true; else hbaline->upn_username = false; } else if (strcmp(name, "radiusservers") == 0) { struct addrinfo *gai_result; struct addrinfo hints; int ret; List *parsed_servers; ListCell *l; char *dupval = pstrdup(val); REQUIRE_AUTH_OPTION(uaRADIUS, "radiusservers", "radius"); if (!SplitGUCList(dupval, ',', &parsed_servers)) { /* syntax error in list */ ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("could not parse RADIUS server list \"%s\"", val), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); return false; } /* For each entry in the list, translate it */ foreach(l, parsed_servers) { MemSet(&hints, 0, sizeof(hints)); hints.ai_socktype = SOCK_DGRAM; hints.ai_family = AF_UNSPEC; ret = pg_getaddrinfo_all((char *) lfirst(l), NULL, &hints, &gai_result); if (ret || !gai_result) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("could not translate RADIUS server name \"%s\" to address: %s", (char *) lfirst(l), gai_strerror(ret)), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); if (gai_result) pg_freeaddrinfo_all(hints.ai_family, gai_result); list_free(parsed_servers); return false; } pg_freeaddrinfo_all(hints.ai_family, gai_result); } /* All entries are OK, so store them */ hbaline->radiusservers = parsed_servers; hbaline->radiusservers_s = pstrdup(val); } else if (strcmp(name, "radiusports") == 0) { List *parsed_ports; ListCell *l; char *dupval = pstrdup(val); REQUIRE_AUTH_OPTION(uaRADIUS, "radiusports", "radius"); if (!SplitGUCList(dupval, ',', &parsed_ports)) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("could not parse RADIUS port list \"%s\"", val), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("invalid RADIUS port number: \"%s\"", val); return false; } foreach(l, parsed_ports) { if (atoi(lfirst(l)) == 0) { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid RADIUS port number: \"%s\"", val), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); return false; } } hbaline->radiusports = parsed_ports; hbaline->radiusports_s = pstrdup(val); } else if (strcmp(name, "radiussecrets") == 0) { List *parsed_secrets; char *dupval = pstrdup(val); REQUIRE_AUTH_OPTION(uaRADIUS, "radiussecrets", "radius"); if (!SplitGUCList(dupval, ',', &parsed_secrets)) { /* syntax error in list */ ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("could not parse RADIUS secret list \"%s\"", val), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); return false; } hbaline->radiussecrets = parsed_secrets; hbaline->radiussecrets_s = pstrdup(val); } else if (strcmp(name, "radiusidentifiers") == 0) { List *parsed_identifiers; char *dupval = pstrdup(val); REQUIRE_AUTH_OPTION(uaRADIUS, "radiusidentifiers", "radius"); if (!SplitGUCList(dupval, ',', &parsed_identifiers)) { /* syntax error in list */ ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("could not parse RADIUS identifiers list \"%s\"", val), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); return false; } hbaline->radiusidentifiers = parsed_identifiers; hbaline->radiusidentifiers_s = pstrdup(val); } else if (strcmp(name, "issuer") == 0) { REQUIRE_AUTH_OPTION(uaOAuth, "issuer", "oauth"); hbaline->oauth_issuer = pstrdup(val); } else if (strcmp(name, "scope") == 0) { REQUIRE_AUTH_OPTION(uaOAuth, "scope", "oauth"); hbaline->oauth_scope = pstrdup(val); } else if (strcmp(name, "validator") == 0) { REQUIRE_AUTH_OPTION(uaOAuth, "validator", "oauth"); hbaline->oauth_validator = pstrdup(val); } else if (strcmp(name, "delegate_ident_mapping") == 0) { REQUIRE_AUTH_OPTION(uaOAuth, "delegate_ident_mapping", "oauth"); if (strcmp(val, "1") == 0) hbaline->oauth_skip_usermap = true; else hbaline->oauth_skip_usermap = false; } else { ereport(elevel, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("unrecognized authentication option name: \"%s\"", name), errcontext("line %d of configuration file \"%s\"", line_num, file_name))); *err_msg = psprintf("unrecognized authentication option name: \"%s\"", name); return false; } return true; } /* * Scan the pre-parsed hba file, looking for a match to the port's connection * request. */ static void check_hba(hbaPort *port) { Oid roleid; ListCell *line; HbaLine *hba; /* Get the target role's OID. Note we do not error out for bad role. */ roleid = get_role_oid(port->user_name, true); foreach(line, parsed_hba_lines) { hba = (HbaLine *) lfirst(line); /* Check connection type */ if (hba->conntype == ctLocal) { if (port->raddr.addr.ss_family != AF_UNIX) continue; } else { if (port->raddr.addr.ss_family == AF_UNIX) continue; /* Check SSL state */ if (port->ssl_in_use) { /* Connection is SSL, match both "host" and "hostssl" */ if (hba->conntype == ctHostNoSSL) continue; } else { /* Connection is not SSL, match both "host" and "hostnossl" */ if (hba->conntype == ctHostSSL) continue; } /* Check GSSAPI state */ #ifdef ENABLE_GSS if (port->gss && port->gss->enc && hba->conntype == ctHostNoGSS) continue; else if (!(port->gss && port->gss->enc) && hba->conntype == ctHostGSS) continue; #else if (hba->conntype == ctHostGSS) continue; #endif /* Check IP address */ switch (hba->ip_cmp_method) { case ipCmpMask: if (hba->hostname) { if (!check_hostname(port, hba->hostname)) continue; } else { if (!check_ip(&port->raddr, (struct sockaddr *) &hba->addr, (struct sockaddr *) &hba->mask)) continue; } break; case ipCmpAll: break; case ipCmpSameHost: case ipCmpSameNet: if (!check_same_host_or_net(&port->raddr, hba->ip_cmp_method)) continue; break; default: /* shouldn't get here, but deem it no-match if so */ continue; } } /* != ctLocal */ /* Check database and role */ if (!check_db(port->database_name, port->user_name, roleid, hba->databases)) continue; if (!check_role(port->user_name, roleid, hba->roles, false)) continue; /* Found a record that matched! */ port->hba = hba; return; } /* If no matching entry was found, then implicitly reject. */ hba = palloc0(sizeof(HbaLine)); hba->auth_method = uaImplicitReject; port->hba = hba; } /* * Read the config file and create a List of HbaLine records for the contents. * * The configuration is read into a temporary list, and if any parse error * occurs the old list is kept in place and false is returned. Only if the * whole file parses OK is the list replaced, and the function returns true. * * On a false result, caller will take care of reporting a FATAL error in case * this is the initial startup. If it happens on reload, we just keep running * with the old data. */ bool load_hba(void) { FILE *file; List *hba_lines = NIL; ListCell *line; List *new_parsed_lines = NIL; bool ok = true; MemoryContext oldcxt; MemoryContext hbacxt; file = open_auth_file(HbaFileName, LOG, 0, NULL); if (file == NULL) { /* error already logged */ return false; } tokenize_auth_file(HbaFileName, file, &hba_lines, LOG, 0); /* Now parse all the lines */ Assert(PostmasterContext); hbacxt = AllocSetContextCreate(PostmasterContext, "hba parser context", ALLOCSET_SMALL_SIZES); oldcxt = MemoryContextSwitchTo(hbacxt); foreach(line, hba_lines) { TokenizedAuthLine *tok_line = (TokenizedAuthLine *) lfirst(line); HbaLine *newline; /* don't parse lines that already have errors */ if (tok_line->err_msg != NULL) { ok = false; continue; } if ((newline = parse_hba_line(tok_line, LOG)) == NULL) { /* Parse error; remember there's trouble */ ok = false; /* * Keep parsing the rest of the file so we can report errors on * more than the first line. Error has already been logged, no * need for more chatter here. */ continue; } new_parsed_lines = lappend(new_parsed_lines, newline); } /* * A valid HBA file must have at least one entry; else there's no way to * connect to the postmaster. But only complain about this if we didn't * already have parsing errors. */ if (ok && new_parsed_lines == NIL) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("configuration file \"%s\" contains no entries", HbaFileName))); ok = false; } /* Free tokenizer memory */ free_auth_file(file, 0); MemoryContextSwitchTo(oldcxt); if (!ok) { /* * File contained one or more errors, so bail out. MemoryContextDelete * is enough to clean up everything, including regexes. */ MemoryContextDelete(hbacxt); return false; } /* Loaded new file successfully, replace the one we use */ if (parsed_hba_context != NULL) MemoryContextDelete(parsed_hba_context); parsed_hba_context = hbacxt; parsed_hba_lines = new_parsed_lines; return true; } /* * Parse one tokenised line from the ident config file and store the result in * an IdentLine structure. * * If parsing fails, log a message at ereport level elevel, store an error * string in tok_line->err_msg and return NULL. * * If ident_user is a regular expression (ie. begins with a slash), it is * compiled and stored in IdentLine structure. * * Note: this function leaks memory when an error occurs. Caller is expected * to have set a memory context that will be reset if this function returns * NULL. */ IdentLine * parse_ident_line(TokenizedAuthLine *tok_line, int elevel) { int line_num = tok_line->line_num; char *file_name = tok_line->file_name; char **err_msg = &tok_line->err_msg; ListCell *field; List *tokens; AuthToken *token; IdentLine *parsedline; Assert(tok_line->fields != NIL); field = list_head(tok_line->fields); parsedline = palloc0(sizeof(IdentLine)); parsedline->linenumber = line_num; /* Get the map token (must exist) */ tokens = lfirst(field); IDENT_MULTI_VALUE(tokens); token = linitial(tokens); parsedline->usermap = pstrdup(token->string); /* Get the ident user token */ field = lnext(tok_line->fields, field); IDENT_FIELD_ABSENT(field); tokens = lfirst(field); IDENT_MULTI_VALUE(tokens); token = linitial(tokens); /* Copy the ident user token */ parsedline->system_user = copy_auth_token(token); /* Get the PG rolename token */ field = lnext(tok_line->fields, field); IDENT_FIELD_ABSENT(field); tokens = lfirst(field); IDENT_MULTI_VALUE(tokens); token = linitial(tokens); parsedline->pg_user = copy_auth_token(token); /* * Now that the field validation is done, compile a regex from the user * tokens, if necessary. */ if (regcomp_auth_token(parsedline->system_user, file_name, line_num, err_msg, elevel)) { /* err_msg includes the error to report */ return NULL; } if (regcomp_auth_token(parsedline->pg_user, file_name, line_num, err_msg, elevel)) { /* err_msg includes the error to report */ return NULL; } return parsedline; } /* * Process one line from the parsed ident config lines. * * Compare input parsed ident line to the needed map, pg_user and system_user. * *found_p and *error_p are set according to our results. */ static void check_ident_usermap(IdentLine *identLine, const char *usermap_name, const char *pg_user, const char *system_user, bool case_insensitive, bool *found_p, bool *error_p) { Oid roleid; *found_p = false; *error_p = false; if (strcmp(identLine->usermap, usermap_name) != 0) /* Line does not match the map name we're looking for, so just abort */ return; /* Get the target role's OID. Note we do not error out for bad role. */ roleid = get_role_oid(pg_user, true); /* Match? */ if (token_has_regexp(identLine->system_user)) { /* * Process the system username as a regular expression that returns * exactly one match. This is replaced for \1 in the database username * string, if present. */ int r; regmatch_t matches[2]; char *ofs; AuthToken *expanded_pg_user_token; bool created_temporary_token = false; r = regexec_auth_token(system_user, identLine->system_user, 2, matches); if (r) { char errstr[100]; if (r != REG_NOMATCH) { /* REG_NOMATCH is not an error, everything else is */ pg_regerror(r, identLine->system_user->regex, errstr, sizeof(errstr)); ereport(LOG, (errcode(ERRCODE_INVALID_REGULAR_EXPRESSION), errmsg("regular expression match for \"%s\" failed: %s", identLine->system_user->string + 1, errstr))); *error_p = true; } return; } /* * Replace \1 with the first captured group unless the field already * has some special meaning, like a group membership or a regexp-based * check. */ if (!token_is_member_check(identLine->pg_user) && !token_has_regexp(identLine->pg_user) && (ofs = strstr(identLine->pg_user->string, "\\1")) != NULL) { char *expanded_pg_user; int offset; /* substitution of the first argument requested */ if (matches[1].rm_so < 0) { ereport(LOG, (errcode(ERRCODE_INVALID_REGULAR_EXPRESSION), errmsg("regular expression \"%s\" has no subexpressions as requested by backreference in \"%s\"", identLine->system_user->string + 1, identLine->pg_user->string))); *error_p = true; return; } /* * length: original length minus length of \1 plus length of match * plus null terminator */ expanded_pg_user = palloc0(strlen(identLine->pg_user->string) - 2 + (matches[1].rm_eo - matches[1].rm_so) + 1); offset = ofs - identLine->pg_user->string; memcpy(expanded_pg_user, identLine->pg_user->string, offset); memcpy(expanded_pg_user + offset, system_user + matches[1].rm_so, matches[1].rm_eo - matches[1].rm_so); strcat(expanded_pg_user, ofs + 2); /* * Mark the token as quoted, so it will only be compared literally * and not for some special meaning, such as "all" or a group * membership check. */ expanded_pg_user_token = make_auth_token(expanded_pg_user, true); created_temporary_token = true; pfree(expanded_pg_user); } else { expanded_pg_user_token = identLine->pg_user; } /* check the Postgres user */ *found_p = check_role(pg_user, roleid, list_make1(expanded_pg_user_token), case_insensitive); if (created_temporary_token) free_auth_token(expanded_pg_user_token); return; } else { /* * Not a regular expression, so make a complete match. If the system * user does not match, just leave. */ if (case_insensitive) { if (!token_matches_insensitive(identLine->system_user, system_user)) return; } else { if (!token_matches(identLine->system_user, system_user)) return; } /* check the Postgres user */ *found_p = check_role(pg_user, roleid, list_make1(identLine->pg_user), case_insensitive); } } /* * Scan the (pre-parsed) ident usermap file line by line, looking for a match * * See if the system user with ident username "system_user" is allowed to act as * Postgres user "pg_user" according to usermap "usermap_name". * * Special case: Usermap NULL, equivalent to what was previously called * "sameuser" or "samerole", means don't look in the usermap file. * That's an implied map wherein "pg_user" must be identical to * "system_user" in order to be authorized. * * Iff authorized, return STATUS_OK, otherwise return STATUS_ERROR. */ int check_usermap(const char *usermap_name, const char *pg_user, const char *system_user, bool case_insensitive) { bool found_entry = false, error = false; if (usermap_name == NULL || usermap_name[0] == '\0') { if (case_insensitive) { if (pg_strcasecmp(pg_user, system_user) == 0) return STATUS_OK; } else { if (strcmp(pg_user, system_user) == 0) return STATUS_OK; } ereport(LOG, (errmsg("provided user name (%s) and authenticated user name (%s) do not match", pg_user, system_user))); return STATUS_ERROR; } else { ListCell *line_cell; foreach(line_cell, parsed_ident_lines) { check_ident_usermap(lfirst(line_cell), usermap_name, pg_user, system_user, case_insensitive, &found_entry, &error); if (found_entry || error) break; } } if (!found_entry && !error) { ereport(LOG, (errmsg("no match in usermap \"%s\" for user \"%s\" authenticated as \"%s\"", usermap_name, pg_user, system_user))); } return found_entry ? STATUS_OK : STATUS_ERROR; } /* * Read the ident config file and create a List of IdentLine records for * the contents. * * This works the same as load_hba(), but for the user config file. */ bool load_ident(void) { FILE *file; List *ident_lines = NIL; ListCell *line_cell; List *new_parsed_lines = NIL; bool ok = true; MemoryContext oldcxt; MemoryContext ident_context; IdentLine *newline; /* not FATAL ... we just won't do any special ident maps */ file = open_auth_file(IdentFileName, LOG, 0, NULL); if (file == NULL) { /* error already logged */ return false; } tokenize_auth_file(IdentFileName, file, &ident_lines, LOG, 0); /* Now parse all the lines */ Assert(PostmasterContext); ident_context = AllocSetContextCreate(PostmasterContext, "ident parser context", ALLOCSET_SMALL_SIZES); oldcxt = MemoryContextSwitchTo(ident_context); foreach(line_cell, ident_lines) { TokenizedAuthLine *tok_line = (TokenizedAuthLine *) lfirst(line_cell); /* don't parse lines that already have errors */ if (tok_line->err_msg != NULL) { ok = false; continue; } if ((newline = parse_ident_line(tok_line, LOG)) == NULL) { /* Parse error; remember there's trouble */ ok = false; /* * Keep parsing the rest of the file so we can report errors on * more than the first line. Error has already been logged, no * need for more chatter here. */ continue; } new_parsed_lines = lappend(new_parsed_lines, newline); } /* Free tokenizer memory */ free_auth_file(file, 0); MemoryContextSwitchTo(oldcxt); if (!ok) { /* * File contained one or more errors, so bail out. MemoryContextDelete * is enough to clean up everything, including regexes. */ MemoryContextDelete(ident_context); return false; } /* Loaded new file successfully, replace the one we use */ if (parsed_ident_context != NULL) MemoryContextDelete(parsed_ident_context); parsed_ident_context = ident_context; parsed_ident_lines = new_parsed_lines; return true; } /* * Determine what authentication method should be used when accessing database * "database" from frontend "raddr", user "user". Return the method and * an optional argument (stored in fields of *port), and STATUS_OK. * * If the file does not contain any entry matching the request, we return * method = uaImplicitReject. */ void hba_getauthmethod(hbaPort *port) { check_hba(port); } /* * Return the name of the auth method in use ("gss", "md5", "trust", etc.). * * The return value is statically allocated (see the UserAuthName array) and * should not be freed. */ const char * hba_authname(UserAuth auth_method) { return UserAuthName[auth_method]; }