/*------------------------------------------------------------------------- * * 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) 1996-2009, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * * IDENTIFICATION * $PostgreSQL: pgsql/src/backend/libpq/hba.c,v 1.180 2009/01/07 13:09:21 mha Exp $ * *------------------------------------------------------------------------- */ #include "postgres.h" #include #include #include #include #include #include #include #include #include "libpq/ip.h" #include "libpq/libpq.h" #include "regex/regex.h" #include "storage/fd.h" #include "utils/flatfiles.h" #include "utils/guc.h" #define atooid(x) ((Oid) strtoul((x), NULL, 10)) #define atoxid(x) ((TransactionId) strtoul((x), NULL, 10)) /* This is used to separate values in multi-valued column strings */ #define MULTI_VALUE_SEP "\001" #define MAX_TOKEN 256 /* pre-parsed content of HBA config file */ static List *parsed_hba_lines = NIL; /* * These variables hold the pre-parsed contents of the ident * configuration files, as well as the flat auth file. * Each is a list of sublists, one sublist for * each (non-empty, non-comment) line of the file. Each sublist's * first item is an integer line number (so we can give somewhat-useful * location info in error messages). Remaining items are palloc'd strings, * one string per token on the line. Note there will always be at least * one token, since blank lines are not entered in the data structure. */ /* pre-parsed content of ident usermap file and corresponding line #s */ static List *ident_lines = NIL; static List *ident_line_nums = NIL; /* pre-parsed content of flat auth file and corresponding line #s */ static List *role_lines = NIL; static List *role_line_nums = NIL; /* sorted entries so we can do binary search lookups */ static List **role_sorted = NULL; /* sorted role list, for bsearch() */ static int role_length; static void tokenize_file(const char *filename, FILE *file, List **lines, List **line_nums); static char *tokenize_inc_file(const char *outer_filename, const char *inc_filename); /* * 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 fp. 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 blanks, but not newlines). * * The token, if any, is returned at *buf (a buffer of size bufsz). * * If successful: store null-terminated token at *buf and return TRUE. * If no more tokens on line: set *buf = '\0' and return FALSE. * * Leave file positioned at the character immediately after the token or EOF, * whichever comes first. If no more tokens on line, position the file to the * beginning of the next line or EOF, whichever comes first. * * Handle comments. Treat unquoted keywords that might be role names or * database names specially, by appending a newline to them. Also, when * a token is terminated by a comma, the comma is included in the returned * token. */ static bool next_token(FILE *fp, char *buf, int bufsz) { int c; char *start_buf = buf; char *end_buf = buf + (bufsz - 2); bool in_quote = false; bool was_quote = false; bool saw_quote = false; Assert(end_buf > start_buf); /* Move over initial whitespace and commas */ while ((c = getc(fp)) != EOF && (pg_isblank(c) || c == ',')) ; if (c == EOF || c == '\n') { *buf = '\0'; return false; } /* * Build a token in buf of next characters up to EOF, EOL, unquoted comma, * or unquoted whitespace. */ while (c != EOF && c != '\n' && (!pg_isblank(c) || in_quote)) { /* skip comments to EOL */ if (c == '#' && !in_quote) { while ((c = getc(fp)) != EOF && c != '\n') ; /* If only comment, consume EOL too; return EOL */ if (c != EOF && buf == start_buf) c = getc(fp); break; } if (buf >= end_buf) { *buf = '\0'; ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("authentication file token too long, skipping: \"%s\"", start_buf))); /* Discard remainder of line */ while ((c = getc(fp)) != EOF && c != '\n') ; break; } if (c != '"' || was_quote) *buf++ = c; /* We pass back the comma so the caller knows there is more */ if (c == ',' && !in_quote) break; /* 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; } c = getc(fp); } /* * Put back the char right after the token (critical in case it is EOL, * since we need to detect end-of-line at next call). */ if (c != EOF) ungetc(c, fp); *buf = '\0'; if (!saw_quote && (strcmp(start_buf, "all") == 0 || strcmp(start_buf, "sameuser") == 0 || strcmp(start_buf, "samegroup") == 0 || strcmp(start_buf, "samerole") == 0)) { /* append newline to a magical keyword */ *buf++ = '\n'; *buf = '\0'; } return (saw_quote || buf > start_buf); } /* * Tokenize file and handle file inclusion and comma lists. We have * to break apart the commas to expand any file names then * reconstruct with commas. * * The result is a palloc'd string, or NULL if we have reached EOL. */ static char * next_token_expand(const char *filename, FILE *file) { char buf[MAX_TOKEN]; char *comma_str = pstrdup(""); bool got_something = false; bool trailing_comma; char *incbuf; int needed; do { if (!next_token(file, buf, sizeof(buf))) break; got_something = true; if (strlen(buf) > 0 && buf[strlen(buf) - 1] == ',') { trailing_comma = true; buf[strlen(buf) - 1] = '\0'; } else trailing_comma = false; /* Is this referencing a file? */ if (buf[0] == '@') incbuf = tokenize_inc_file(filename, buf + 1); else incbuf = pstrdup(buf); needed = strlen(comma_str) + strlen(incbuf) + 1; if (trailing_comma) needed++; comma_str = repalloc(comma_str, needed); strcat(comma_str, incbuf); if (trailing_comma) strcat(comma_str, MULTI_VALUE_SEP); pfree(incbuf); } while (trailing_comma); if (!got_something) { pfree(comma_str); return NULL; } return comma_str; } /* * Free memory used by lines/tokens (i.e., structure built by tokenize_file) */ static void free_lines(List **lines, List **line_nums) { /* * Either both must be non-NULL, or both must be NULL */ Assert((*lines != NIL && *line_nums != NIL) || (*lines == NIL && *line_nums == NIL)); if (*lines) { /* * "lines" is a list of lists; each of those sublists consists of * palloc'ed tokens, so we want to free each pointed-to token in a * sublist, followed by the sublist itself, and finally the whole * list. */ ListCell *line; foreach(line, *lines) { List *ln = lfirst(line); ListCell *token; foreach(token, ln) pfree(lfirst(token)); /* free the sublist structure itself */ list_free(ln); } /* free the list structure itself */ list_free(*lines); /* clear the static variable */ *lines = NIL; } if (*line_nums) { list_free(*line_nums); *line_nums = NIL; } } static char * tokenize_inc_file(const char *outer_filename, const char *inc_filename) { char *inc_fullname; FILE *inc_file; List *inc_lines; List *inc_line_nums; ListCell *line; char *comma_str; if (is_absolute_path(inc_filename)) { /* absolute path is taken as-is */ inc_fullname = pstrdup(inc_filename); } else { /* relative path is relative to dir of calling file */ inc_fullname = (char *) palloc(strlen(outer_filename) + 1 + strlen(inc_filename) + 1); strcpy(inc_fullname, outer_filename); get_parent_directory(inc_fullname); join_path_components(inc_fullname, inc_fullname, inc_filename); canonicalize_path(inc_fullname); } inc_file = AllocateFile(inc_fullname, "r"); if (inc_file == NULL) { ereport(LOG, (errcode_for_file_access(), errmsg("could not open secondary authentication file \"@%s\" as \"%s\": %m", inc_filename, inc_fullname))); pfree(inc_fullname); /* return single space, it matches nothing */ return pstrdup(" "); } /* There is possible recursion here if the file contains @ */ tokenize_file(inc_fullname, inc_file, &inc_lines, &inc_line_nums); FreeFile(inc_file); pfree(inc_fullname); /* Create comma-separated string from List */ comma_str = pstrdup(""); foreach(line, inc_lines) { List *token_list = (List *) lfirst(line); ListCell *token; foreach(token, token_list) { int oldlen = strlen(comma_str); int needed; needed = oldlen + strlen(lfirst(token)) + 1; if (oldlen > 0) needed++; comma_str = repalloc(comma_str, needed); if (oldlen > 0) strcat(comma_str, MULTI_VALUE_SEP); strcat(comma_str, lfirst(token)); } } free_lines(&inc_lines, &inc_line_nums); /* if file is empty, return single space rather than empty string */ if (strlen(comma_str) == 0) { pfree(comma_str); return pstrdup(" "); } return comma_str; } /* * Tokenize the given file, storing the resulting data into two lists: * a list of sublists, each sublist containing the tokens in a line of * the file, and a list of line numbers. * * filename must be the absolute path to the target file. */ static void tokenize_file(const char *filename, FILE *file, List **lines, List **line_nums) { List *current_line = NIL; int line_number = 1; char *buf; *lines = *line_nums = NIL; while (!feof(file)) { buf = next_token_expand(filename, file); /* add token to list, unless we are at EOL or comment start */ if (buf) { if (current_line == NIL) { /* make a new line List, record its line number */ current_line = lappend(current_line, buf); *lines = lappend(*lines, current_line); *line_nums = lappend_int(*line_nums, line_number); } else { /* append token to current line's list */ current_line = lappend(current_line, buf); } } else { /* we are at real or logical EOL, so force a new line List */ current_line = NIL; /* Advance line number whenever we reach EOL */ line_number++; } } } /* * Compare two lines based on their role/member names. * * Used for bsearch() lookup. */ static int role_bsearch_cmp(const void *role, const void *list) { char *role2 = linitial(*(List **) list); return strcmp(role, role2); } /* * Lookup a role name in the pg_auth file */ List ** get_role_line(const char *role) { /* On some versions of Solaris, bsearch of zero items dumps core */ if (role_length == 0) return NULL; return (List **) bsearch((void *) role, (void *) role_sorted, role_length, sizeof(List *), role_bsearch_cmp); } /* * Does user belong to role? * * user is always the name given as the attempted login identifier. * We check to see if it is a member of the specified role name. */ static bool is_member(const char *user, const char *role) { List **line; ListCell *line_item; if ((line = get_role_line(user)) == NULL) return false; /* if user not exist, say "no" */ /* A user always belongs to its own role */ if (strcmp(user, role) == 0) return true; /* * skip over the role name, password, valuntil, examine all the membership * entries */ if (list_length(*line) < 4) return false; for_each_cell(line_item, lnext(lnext(lnext(list_head(*line))))) { if (strcmp((char *) lfirst(line_item), role) == 0) return true; } return false; } /* * Check comma-separated list for a match to role, allowing group names. * * NB: param_str is destructively modified! In current usage, this is * okay only because this code is run after forking off from the postmaster, * and so it doesn't matter that we clobber the stored hba info. */ static bool check_role(const char *role, char *param_str) { char *tok; for (tok = strtok(param_str, MULTI_VALUE_SEP); tok != NULL; tok = strtok(NULL, MULTI_VALUE_SEP)) { if (tok[0] == '+') { if (is_member(role, tok + 1)) return true; } else if (strcmp(tok, role) == 0 || strcmp(tok, "all\n") == 0) return true; } return false; } /* * Check to see if db/role combination matches param string. * * NB: param_str is destructively modified! In current usage, this is * okay only because this code is run after forking off from the postmaster, * and so it doesn't matter that we clobber the stored hba info. */ static bool check_db(const char *dbname, const char *role, char *param_str) { char *tok; for (tok = strtok(param_str, MULTI_VALUE_SEP); tok != NULL; tok = strtok(NULL, MULTI_VALUE_SEP)) { if (strcmp(tok, "all\n") == 0) return true; else if (strcmp(tok, "sameuser\n") == 0) { if (strcmp(dbname, role) == 0) return true; } else if (strcmp(tok, "samegroup\n") == 0 || strcmp(tok, "samerole\n") == 0) { if (is_member(role, dbname)) return true; } else if (strcmp(tok, dbname) == 0) return true; } return false; } /* * Macros used to check and report on invalid configuration options. * 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(LOG, \ (errcode(ERRCODE_CONFIG_FILE_ERROR), \ errmsg("authentication option '%s' is only valid for authentication methods '%s'", \ optname, validmethods), \ errcontext("line %d of configuration file \"%s\"", \ line_num, HbaFileName))); \ return false; \ } while (0); #define REQUIRE_AUTH_OPTION(methodval, optname, validmethods) do {\ if (parsedline->auth_method != methodval) \ INVALID_AUTH_OPTION(optname, validmethods); \ } while (0); #define MANDATORY_AUTH_ARG(argvar, argname, authname) do {\ if (argvar == NULL) {\ ereport(LOG, \ (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, HbaFileName))); \ return false; \ } \ } while (0); /* * Parse one line in the hba config file and store the result in * a HbaLine structure. */ static bool parse_hba_line(List *line, int line_num, HbaLine *parsedline) { char *token; struct addrinfo *gai_result; struct addrinfo hints; int ret; char *cidr_slash; char *unsupauth; ListCell *line_item; line_item = list_head(line); parsedline->linenumber = line_num; /* Check the record type. */ token = lfirst(line_item); if (strcmp(token, "local") == 0) { parsedline->conntype = ctLocal; } else if (strcmp(token, "host") == 0 || strcmp(token, "hostssl") == 0 || strcmp(token, "hostnossl") == 0) { if (token[4] == 's') /* "hostssl" */ { #ifdef USE_SSL parsedline->conntype = ctHostSSL; #else ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("hostssl not supported on this platform"), errhint("compile with --enable-ssl to use SSL connections"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; #endif } #ifdef USE_SSL else if (token[4] == 'n') /* "hostnossl" */ { parsedline->conntype = ctHostNoSSL; } #endif else { /* "host", or "hostnossl" and SSL support not built in */ parsedline->conntype = ctHost; } } /* record type */ else { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid connection type \"%s\"", token), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } /* Get the database. */ line_item = lnext(line_item); if (!line_item) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("end-of-line before database specification"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } parsedline->database = pstrdup(lfirst(line_item)); /* Get the role. */ line_item = lnext(line_item); if (!line_item) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("end-of-line before role specification"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } parsedline->role = pstrdup(lfirst(line_item)); if (parsedline->conntype != ctLocal) { /* Read the IP address field. (with or without CIDR netmask) */ line_item = lnext(line_item); if (!line_item) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("end-of-line before ip address specification"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } token = pstrdup(lfirst(line_item)); /* Check if it has a CIDR suffix and if so isolate it */ cidr_slash = strchr(token, '/'); if (cidr_slash) *cidr_slash = '\0'; /* Get the IP address either way */ hints.ai_flags = AI_NUMERICHOST; hints.ai_family = PF_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(token, NULL, &hints, &gai_result); if (ret || !gai_result) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid IP address \"%s\": %s", token, gai_strerror(ret)), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); if (cidr_slash) *cidr_slash = '/'; if (gai_result) pg_freeaddrinfo_all(hints.ai_family, gai_result); return false; } if (cidr_slash) *cidr_slash = '/'; memcpy(&parsedline->addr, gai_result->ai_addr, gai_result->ai_addrlen); pg_freeaddrinfo_all(hints.ai_family, gai_result); /* Get the netmask */ if (cidr_slash) { if (pg_sockaddr_cidr_mask(&parsedline->mask, cidr_slash + 1, parsedline->addr.ss_family) < 0) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid CIDR mask in address \"%s\"", token), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } } else { /* Read the mask field. */ line_item = lnext(line_item); if (!line_item) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("end-of-line before netmask specification"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } token = lfirst(line_item); ret = pg_getaddrinfo_all(token, NULL, &hints, &gai_result); if (ret || !gai_result) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid IP mask \"%s\": %s", token, gai_strerror(ret)), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); if (gai_result) pg_freeaddrinfo_all(hints.ai_family, gai_result); return false; } memcpy(&parsedline->mask, gai_result->ai_addr, gai_result->ai_addrlen); pg_freeaddrinfo_all(hints.ai_family, gai_result); if (parsedline->addr.ss_family != parsedline->mask.ss_family) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("IP address and mask do not match in file \"%s\" line %d", HbaFileName, line_num))); return false; } } } /* != ctLocal */ /* Get the authentication method */ line_item = lnext(line_item); if (!line_item) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("end-of-line before authentication method"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } token = lfirst(line_item); unsupauth = NULL; if (strcmp(token, "trust") == 0) parsedline->auth_method = uaTrust; else if (strcmp(token, "ident") == 0) parsedline->auth_method = uaIdent; else if (strcmp(token, "password") == 0) parsedline->auth_method = uaPassword; else if (strcmp(token, "krb5") == 0) #ifdef KRB5 parsedline->auth_method = uaKrb5; #else unsupauth = "krb5"; #endif else if (strcmp(token, "gss") == 0) #ifdef ENABLE_GSS parsedline->auth_method = uaGSS; #else unsupauth = "gss"; #endif else if (strcmp(token, "sspi") == 0) #ifdef ENABLE_SSPI parsedline->auth_method = uaSSPI; #else unsupauth = "sspi"; #endif else if (strcmp(token, "reject") == 0) parsedline->auth_method = uaReject; else if (strcmp(token, "md5") == 0) { if (Db_user_namespace) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("MD5 authentication is not supported when \"db_user_namespace\" is enabled"))); return false; } parsedline->auth_method = uaMD5; } else if (strcmp(token, "pam") == 0) #ifdef USE_PAM parsedline->auth_method = uaPAM; #else unsupauth = "pam"; #endif else if (strcmp(token, "ldap") == 0) #ifdef USE_LDAP parsedline->auth_method = uaLDAP; #else unsupauth = "ldap"; #endif else if (strcmp(token, "cert") == 0) #ifdef USE_SSL parsedline->auth_method = uaCert; #else unsupauth = "cert"; #endif else { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid authentication method \"%s\"", token), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } if (unsupauth) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid authentication method \"%s\": not supported on this platform", token), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } /* Invalid authentication combinations */ if (parsedline->conntype == ctLocal && parsedline->auth_method == uaKrb5) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("krb5 authentication is not supported on local sockets"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } if (parsedline->conntype != ctHostSSL && parsedline->auth_method == uaCert) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("cert authentication is only supported on hostssl connections"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } /* Parse remaining arguments */ while ((line_item = lnext(line_item)) != NULL) { char *c; token = lfirst(line_item); c = strchr(token, '='); if (c == NULL) { /* * Got something that's not a name=value pair. * * XXX: attempt to do some backwards compatible parsing here? */ ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("authentication option not in name=value format: %s", token), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } else { *c++ = '\0'; /* token now holds "name", c holds "value" */ if (strcmp(token, "map") == 0) { if (parsedline->auth_method != uaIdent && parsedline->auth_method != uaKrb5 && parsedline->auth_method != uaGSS && parsedline->auth_method != uaSSPI && parsedline->auth_method != uaCert) INVALID_AUTH_OPTION("map", "ident, krb5, gssapi, sspi and cert"); parsedline->usermap = pstrdup(c); } else if (strcmp(token, "clientcert") == 0) { /* * Since we require ctHostSSL, this really can never happen on non-SSL-enabled * builds, so don't bother checking for USE_SSL. */ if (parsedline->conntype != ctHostSSL) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("clientcert can only be configured for \"hostssl\" rows"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } if (strcmp(c, "1") == 0) { if (!secure_loaded_verify_locations()) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("client certificates can only be checked if a root certificate store is available"), errdetail("make sure the root certificate store is present and readable"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } parsedline->clientcert = true; } else { if (parsedline->auth_method == uaCert) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("clientcert can not be set to 0 when using \"cert\" authentication"), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } parsedline->clientcert = false; } } else if (strcmp(token, "pamservice") == 0) { REQUIRE_AUTH_OPTION(uaPAM, "pamservice", "pam"); parsedline->pamservice = pstrdup(c); } else if (strcmp(token, "ldaptls") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldaptls", "ldap"); if (strcmp(c, "1") == 0) parsedline->ldaptls = true; else parsedline->ldaptls = false; } else if (strcmp(token, "ldapserver") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapserver", "ldap"); parsedline->ldapserver = pstrdup(c); } else if (strcmp(token, "ldapport") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapport", "ldap"); parsedline->ldapport = atoi(c); if (parsedline->ldapport == 0) { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("invalid ldap port '%s'", c), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } } else if (strcmp(token, "ldapprefix") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapprefix", "ldap"); parsedline->ldapprefix = pstrdup(c); } else if (strcmp(token, "ldapsuffix") == 0) { REQUIRE_AUTH_OPTION(uaLDAP, "ldapsuffix", "ldap"); parsedline->ldapsuffix = pstrdup(c); } else if (strcmp(token, "krb_server_hostname") == 0) { REQUIRE_AUTH_OPTION(uaKrb5, "krb_server_hostname", "krb5"); parsedline->krb_server_hostname = pstrdup(c); } else if (strcmp(token, "krb_realm") == 0) { if (parsedline->auth_method != uaKrb5 && parsedline->auth_method != uaGSS && parsedline->auth_method != uaSSPI) INVALID_AUTH_OPTION("krb_realm", "krb5, gssapi and sspi"); parsedline->krb_realm = pstrdup(c); } else if (strcmp(token, "include_realm") == 0) { if (parsedline->auth_method != uaKrb5 && parsedline->auth_method != uaGSS && parsedline->auth_method != uaSSPI) INVALID_AUTH_OPTION("include_realm", "krb5, gssapi and sspi"); if (strcmp(c, "1") == 0) parsedline->include_realm = true; else parsedline->include_realm = false; } else { ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("unknown authentication option name '%s'", token), errcontext("line %d of configuration file \"%s\"", line_num, HbaFileName))); return false; } } } /* * Check if the selected authentication method has any mandatory arguments that * are not set. */ if (parsedline->auth_method == uaLDAP) { MANDATORY_AUTH_ARG(parsedline->ldapserver, "ldapserver", "ldap"); } /* * Enforce any parameters implied by other settings. */ if (parsedline->auth_method == uaCert) { parsedline->clientcert = true; } return true; } /* * Scan the (pre-parsed) hba file line by line, looking for a match * to the port's connection request. */ static bool check_hba(hbaPort *port) { ListCell *line; HbaLine *hba; foreach(line, parsed_hba_lines) { hba = (HbaLine *) lfirst(line); /* Check connection type */ if (hba->conntype == ctLocal) { if (!IS_AF_UNIX(port->raddr.addr.ss_family)) continue; } else { if (IS_AF_UNIX(port->raddr.addr.ss_family)) continue; /* Check SSL state */ #ifdef USE_SSL if (port->ssl) { /* 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; } #else /* No SSL support, so reject "hostssl" lines */ if (hba->conntype == ctHostSSL) continue; #endif /* Check IP address */ if (port->raddr.addr.ss_family == hba->addr.ss_family) { if (!pg_range_sockaddr(&port->raddr.addr, &hba->addr, &hba->mask)) continue; } #ifdef HAVE_IPV6 else if (hba->addr.ss_family == AF_INET && port->raddr.addr.ss_family == AF_INET6) { /* * Wrong address family. We allow only one case: if the file has * IPv4 and the port is IPv6, promote the file address to IPv6 and * try to match that way. */ struct sockaddr_storage addrcopy, maskcopy; memcpy(&addrcopy, &hba->addr, sizeof(addrcopy)); memcpy(&maskcopy, &hba->mask, sizeof(maskcopy)); pg_promote_v4_to_v6_addr(&addrcopy); pg_promote_v4_to_v6_mask(&maskcopy); if (!pg_range_sockaddr(&port->raddr.addr, &addrcopy, &maskcopy)) continue; } #endif /* HAVE_IPV6 */ else /* Wrong address family, no IPV6 */ continue; } /* != ctLocal */ /* Check database and role */ if (!check_db(port->database_name, port->user_name, hba->database)) continue; if (!check_role(port->user_name, hba->role)) continue; /* Found a record that matched! */ port->hba = hba; return true; } /* If no matching entry was found, synthesize 'reject' entry. */ hba = palloc0(sizeof(HbaLine)); hba->auth_method = uaReject; port->hba = hba; return true; /* XXX: * Return false only happens if we have a parsing error, which we can * no longer have (parsing now in postmaster). Consider changing API. */ } /* * Load role/password mapping file */ void load_role(void) { char *filename; FILE *role_file; /* Discard any old data */ if (role_lines || role_line_nums) free_lines(&role_lines, &role_line_nums); if (role_sorted) pfree(role_sorted); role_sorted = NULL; role_length = 0; /* Read in the file contents */ filename = auth_getflatfilename(); role_file = AllocateFile(filename, "r"); if (role_file == NULL) { /* no complaint if not there */ if (errno != ENOENT) ereport(LOG, (errcode_for_file_access(), errmsg("could not open file \"%s\": %m", filename))); pfree(filename); return; } tokenize_file(filename, role_file, &role_lines, &role_line_nums); FreeFile(role_file); pfree(filename); /* create array for binary searching */ role_length = list_length(role_lines); if (role_length) { int i = 0; ListCell *line; /* We assume the flat file was written already-sorted */ role_sorted = palloc(role_length * sizeof(List *)); foreach(line, role_lines) role_sorted[i++] = lfirst(line); } } /* * Free the contents of a hba record */ static void free_hba_record(HbaLine *record) { if (record->database) pfree(record->database); if (record->role) pfree(record->role); if (record->pamservice) pfree(record->pamservice); if (record->ldapserver) pfree(record->ldapserver); if (record->ldapprefix) pfree(record->ldapprefix); if (record->ldapsuffix) pfree(record->ldapsuffix); if (record->krb_server_hostname) pfree(record->krb_server_hostname); if (record->krb_realm) pfree(record->krb_realm); } /* * Free all records on the parsed HBA list */ static void clean_hba_list(List *lines) { ListCell *line; foreach(line, lines) { HbaLine *parsed = (HbaLine *)lfirst(line); if (parsed) free_hba_record(parsed); } list_free(lines); } /* * 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. */ bool load_hba(void) { FILE *file; List *hba_lines = NIL; List *hba_line_nums = NIL; ListCell *line, *line_num; List *new_parsed_lines = NIL; file = AllocateFile(HbaFileName, "r"); /* Failure is fatal since with no HBA entries we can do nothing... */ if (file == NULL) ereport(FATAL, (errcode_for_file_access(), errmsg("could not open configuration file \"%s\": %m", HbaFileName))); tokenize_file(HbaFileName, file, &hba_lines, &hba_line_nums); FreeFile(file); /* Now parse all the lines */ forboth(line, hba_lines, line_num, hba_line_nums) { HbaLine *newline; newline = palloc0(sizeof(HbaLine)); if (!parse_hba_line(lfirst(line), lfirst_int(line_num), newline)) { /* Parse error in the file, so bail out */ free_hba_record(newline); pfree(newline); clean_hba_list(new_parsed_lines); /* Error has already been reported in the parsing function */ return false; } new_parsed_lines = lappend(new_parsed_lines, newline); } /* Loaded new file successfully, replace the one we use */ clean_hba_list(parsed_hba_lines); parsed_hba_lines = new_parsed_lines; /* Free the temporary lists */ free_lines(&hba_lines, &hba_line_nums); return true; } /* * Read and parse one line from the flat pg_database file. * * Returns TRUE on success, FALSE if EOF; bad data causes elog(FATAL). * * Output parameters: * dbname: gets database name (must be of size NAMEDATALEN bytes) * dboid: gets database OID * dbtablespace: gets database's default tablespace's OID * dbfrozenxid: gets database's frozen XID * * This is not much related to the other functions in hba.c, but we put it * here because it uses the next_token() infrastructure. */ bool read_pg_database_line(FILE *fp, char *dbname, Oid *dboid, Oid *dbtablespace, TransactionId *dbfrozenxid) { char buf[MAX_TOKEN]; if (feof(fp)) return false; if (!next_token(fp, buf, sizeof(buf))) return false; if (strlen(buf) >= NAMEDATALEN) elog(FATAL, "bad data in flat pg_database file"); strcpy(dbname, buf); next_token(fp, buf, sizeof(buf)); if (!isdigit((unsigned char) buf[0])) elog(FATAL, "bad data in flat pg_database file"); *dboid = atooid(buf); next_token(fp, buf, sizeof(buf)); if (!isdigit((unsigned char) buf[0])) elog(FATAL, "bad data in flat pg_database file"); *dbtablespace = atooid(buf); next_token(fp, buf, sizeof(buf)); if (!isdigit((unsigned char) buf[0])) elog(FATAL, "bad data in flat pg_database file"); *dbfrozenxid = atoxid(buf); /* expect EOL next */ if (next_token(fp, buf, sizeof(buf))) elog(FATAL, "bad data in flat pg_database file"); return true; } /* * Process one line from the ident config file. * * Take the line and compare it to the needed map, pg_role and ident_user. * *found_p and *error_p are set according to our results. */ static void parse_ident_usermap(List *line, int line_number, const char *usermap_name, const char *pg_role, const char *ident_user, bool case_insensitive, bool *found_p, bool *error_p) { ListCell *line_item; char *token; char *file_map; char *file_pgrole; char *file_ident_user; *found_p = false; *error_p = false; Assert(line != NIL); line_item = list_head(line); /* Get the map token (must exist) */ token = lfirst(line_item); file_map = token; /* Get the ident user token */ line_item = lnext(line_item); if (!line_item) goto ident_syntax; token = lfirst(line_item); file_ident_user = token; /* Get the PG rolename token */ line_item = lnext(line_item); if (!line_item) goto ident_syntax; token = lfirst(line_item); file_pgrole = token; if (strcmp(file_map, usermap_name) != 0) /* Line does not match the map name we're looking for, so just abort */ return; /* Match? */ if (file_ident_user[0] == '/') { /* * When system username starts with a slash, treat it as a regular expression. * In this case, we 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; regex_t re; regmatch_t matches[2]; pg_wchar *wstr; int wlen; char *ofs; char *regexp_pgrole; wstr = palloc((strlen(file_ident_user+1) + 1) * sizeof(pg_wchar)); wlen = pg_mb2wchar_with_len(file_ident_user+1, wstr, strlen(file_ident_user+1)); /* * XXX: Major room for optimization: regexps could be compiled when the file is loaded * and then re-used in every connection. */ r = pg_regcomp(&re, wstr, wlen, REG_ADVANCED); if (r) { char errstr[100]; pg_regerror(r, &re, errstr, sizeof(errstr)); ereport(ERROR, (errcode(ERRCODE_INVALID_REGULAR_EXPRESSION), errmsg("invalid regular expression '%s': %s", file_ident_user+1, errstr))); pfree(wstr); *error_p = true; return; } pfree(wstr); wstr = palloc((strlen(ident_user) + 1) * sizeof(pg_wchar)); wlen = pg_mb2wchar_with_len(ident_user, wstr, strlen(ident_user)); r = pg_regexec(&re, wstr, wlen, 0, NULL, 2, matches,0); if (r) { char errstr[100]; if (r != REG_NOMATCH) { /* REG_NOMATCH is not an error, everything else is */ pg_regerror(r, &re, errstr, sizeof(errstr)); ereport(ERROR, (errcode(ERRCODE_INVALID_REGULAR_EXPRESSION), errmsg("regular expression match for '%s' failed: %s", file_ident_user+1, errstr))); *error_p = true; } pfree(wstr); pg_regfree(&re); return; } pfree(wstr); if ((ofs = strstr(file_pgrole, "\\1")) != NULL) { /* substitution of the first argument requested */ if (matches[1].rm_so < 0) ereport(ERROR, (errcode(ERRCODE_INVALID_REGULAR_EXPRESSION), errmsg("regular expression '%s' has no subexpressions as requested by backreference in '%s'", file_ident_user+1, file_pgrole))); /* length: original length minus length of \1 plus length of match plus null terminator */ regexp_pgrole = palloc0(strlen(file_pgrole) - 2 + (matches[1].rm_eo-matches[1].rm_so) + 1); strncpy(regexp_pgrole, file_pgrole, (ofs-file_pgrole)); memcpy(regexp_pgrole+strlen(regexp_pgrole), ident_user+matches[1].rm_so, matches[1].rm_eo-matches[1].rm_so); strcat(regexp_pgrole, ofs+2); } else { /* no substitution, so copy the match */ regexp_pgrole = pstrdup(file_pgrole); } pg_regfree(&re); /* now check if the username actually matched what the user is trying to connect as */ if (case_insensitive) { if (pg_strcasecmp(regexp_pgrole, pg_role) == 0) *found_p = true; } else { if (strcmp(regexp_pgrole, pg_role) == 0) *found_p = true; } pfree(regexp_pgrole); return; } else { /* Not regular expression, so make complete match */ if (case_insensitive) { if (pg_strcasecmp(file_pgrole, pg_role) == 0 && pg_strcasecmp(file_ident_user, ident_user) == 0) *found_p = true; } else { if (strcmp(file_pgrole, pg_role) == 0 && strcmp(file_ident_user, ident_user) == 0) *found_p = true; } } return; ident_syntax: ereport(LOG, (errcode(ERRCODE_CONFIG_FILE_ERROR), errmsg("missing entry in file \"%s\" at end of line %d", IdentFileName, line_number))); *error_p = true; } /* * Scan the (pre-parsed) ident usermap file line by line, looking for a match * * See if the user with ident username "ident_user" is allowed to act * as Postgres user "pgrole" according to usermap "usermap_name". * * Special case: Usermap NULL, equivalent to what was previously called * "sameuser" or "samerole", don't look in the usermap * file. That's an implied map where "pgrole" must be identical to * "ident_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_role, const char *auth_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_role, auth_user) == 0) return STATUS_OK; } else { if (strcmp(pg_role, auth_user) == 0) return STATUS_OK; } ereport(LOG, (errmsg("provided username (%s) and authenticated username (%s) don't match", auth_user, pg_role))); return STATUS_ERROR; } else { ListCell *line_cell, *num_cell; forboth(line_cell, ident_lines, num_cell, ident_line_nums) { parse_ident_usermap(lfirst(line_cell), lfirst_int(num_cell), usermap_name, pg_role, auth_user, case_insensitive, &found_entry, &error); if (found_entry || error) break; } } if (!found_entry && !error) { ereport(LOG, (errmsg("no match in usermap for user '%s' authenticated as '%s'", pg_role, auth_user), errcontext("usermap '%s'", usermap_name))); } return found_entry?STATUS_OK:STATUS_ERROR; } /* * Read the ident config file and create a List of Lists of tokens in the file. */ void load_ident(void) { FILE *file; if (ident_lines || ident_line_nums) free_lines(&ident_lines, &ident_line_nums); file = AllocateFile(IdentFileName, "r"); if (file == NULL) { /* not fatal ... we just won't do any special ident maps */ ereport(LOG, (errcode_for_file_access(), errmsg("could not open Ident usermap file \"%s\": %m", IdentFileName))); } else { tokenize_file(IdentFileName, file, &ident_lines, &ident_line_nums); FreeFile(file); } } /* * 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. * * Note that STATUS_ERROR indicates a problem with the hba config file. * If the file is OK but does not contain any entry matching the request, * we return STATUS_OK and method = uaReject. */ int hba_getauthmethod(hbaPort *port) { if (check_hba(port)) return STATUS_OK; else return STATUS_ERROR; }