diff options
Diffstat (limited to 'dirmngr/crlcache.c')
| -rw-r--r-- | dirmngr/crlcache.c | 2741 |
1 files changed, 2741 insertions, 0 deletions
diff --git a/dirmngr/crlcache.c b/dirmngr/crlcache.c new file mode 100644 index 0000000..2380369 --- /dev/null +++ b/dirmngr/crlcache.c @@ -0,0 +1,2741 @@ +/* crlcache.c - LDAP access + * Copyright (C) 2002 Klarälvdalens Datakonsult AB + * Copyright (C) 2003, 2004, 2005, 2008 g10 Code GmbH + * + * This file is part of DirMngr. + * + * DirMngr is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * DirMngr is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses/>. + */ + +/* + + 1. To keep track of the CRLs actually cached and to store the meta + information of the CRLs a simple record oriented text file is + used. Fields in the file are colon (':') separated and values + containing colons or linefeeds are percent escaped (e.g. a colon + itself is represented as "%3A"). + + The first field is a record type identifier, so that the file is + useful to keep track of other meta data too. + + The name of the file is "DIR.txt". + + + 1.1. Comment record + + Field 1: Constant beginning with "#". + + Other fields are not defined and such a record is simply + skipped during processing. + + 1.2. Version record + + Field 1: Constant "v" + Field 2: Version number of this file. Must be 1. + + This record must be the first non-comment record and + there shall only exist one record of this type. + + 1.3. CRL cache record + + Field 1: Constant "c", "u" or "i". + A "c" or "u" indicate a valid cache entry, however + "u" requires that a user root certificate check needs + to be done. + An "i" indicates an invalid cache entry which should + not be used but still exists so that it can be + updated at NEXT_UPDATE. + Field 2: Hexadecimal encoded SHA-1 hash of the issuer DN using + uppercase letters. + Field 3: Issuer DN in RFC-2253 notation. + Field 4: URL used to retrieve the corresponding CRL. + Field 5: 15 character ISO timestamp with THIS_UPDATE. + Field 6: 15 character ISO timestamp with NEXT_UPDATE. + Field 7: Hexadecimal encoded MD-5 hash of the DB file to detect + accidental modified (i.e. deleted and created) cache files. + Field 8: optional CRL number as a hex string. + Field 9: AuthorityKeyID.issuer, each Name separated by 0x01 + Field 10: AuthorityKeyID.serial + Field 11: Hex fingerprint of trust anchor if field 1 is 'u'. + + 2. Layout of the standard CRL Cache DB file: + + We use records of variable length with this structure + + n bytes Serialnumber (binary) used as key + thus there is no need to store the length explicitly with DB2. + 1 byte Reason for revocation + (currently the KSBA reason flags are used) + 15 bytes ISO date of revocation (e.g. 19980815T142000) + Note that there is no terminating 0 stored. + + The filename used is the hexadecimal (using uppercase letters) + SHA-1 hash value of the issuer DN prefixed with a "crl-" and + suffixed with a ".db". Thus the length of the filename is 47. + + +*/ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <errno.h> +#include <string.h> +#include <sys/stat.h> +#include <assert.h> +#include <dirent.h> +#include <fcntl.h> +#include <unistd.h> +#ifndef HAVE_W32_SYSTEM +#include <sys/utsname.h> +#endif + +#include "dirmngr.h" +#include "validate.h" +#include "certcache.h" +#include "crlcache.h" +#include "crlfetch.h" +#include "misc.h" +#include "cdb.h" + +/* Change this whenever the format changes */ +#define DBDIR_D "crls.d" +#define DBDIRFILE "DIR.txt" +#define DBDIRVERSION 1 + +/* The number of DB files we may have open at one time. We need to + limit this because there is no guarantee that the number of issuers + has a upper limit. We are currently using mmap, so it is a good + idea anyway to limit the number of opened cache files. */ +#define MAX_OPEN_DB_FILES 5 + +#ifndef O_BINARY +# define O_BINARY 0 +#endif + +static const char oidstr_crlNumber[] = "2.5.29.20"; +/* static const char oidstr_issuingDistributionPoint[] = "2.5.29.28"; */ +static const char oidstr_authorityKeyIdentifier[] = "2.5.29.35"; + + +/* Definition of one cached item. */ +struct crl_cache_entry_s +{ + struct crl_cache_entry_s *next; + int deleted; /* True if marked for deletion. */ + int mark; /* Internally used by update_dir. */ + unsigned int lineno;/* A 0 indicates a new entry. */ + char *release_ptr; /* The actual allocated memory. */ + char *url; /* Points into RELEASE_PTR. */ + char *issuer; /* Ditto. */ + char *issuer_hash; /* Ditto. */ + char *dbfile_hash; /* MD5 sum of the cache file, points into RELEASE_PTR.*/ + int invalid; /* Can't use this CRL. */ + int user_trust_req; /* User supplied root certificate required. */ + char *check_trust_anchor; /* Malloced fingerprint. */ + ksba_isotime_t this_update; + ksba_isotime_t next_update; + ksba_isotime_t last_refresh; /* Use for the force_crl_refresh feature. */ + char *crl_number; + char *authority_issuer; + char *authority_serialno; + + struct cdb *cdb; /* The cache file handle or NULL if not open. */ + + unsigned int cdb_use_count; /* Current use count. */ + unsigned int cdb_lru_count; /* Used for LRU purposes. */ + int dbfile_checked; /* Set to true if the dbfile_hash value has + been checked one. */ +}; + + +/* Definition of the entire cache object. */ +struct crl_cache_s +{ + crl_cache_entry_t entries; +}; + +typedef struct crl_cache_s *crl_cache_t; + + +/* Prototypes. */ +static crl_cache_entry_t find_entry (crl_cache_entry_t first, + const char *issuer_hash); + + + +/* The currently loaded cache object. This is usually initialized + right at startup. */ +static crl_cache_t current_cache; + + + + + +/* Return the current cache object or bail out if it is has not yet + been initialized. */ +static crl_cache_t +get_current_cache (void) +{ + if (!current_cache) + log_fatal ("CRL cache has not yet been initialized\n"); + return current_cache; +} + + +/* + Create ae directory if it does not yet exists. Returns on + success, or -1 on error. + */ +static int +create_directory_if_needed (const char *name) +{ + gnupg_dir_t dir; + char *fname; + + fname = make_filename (opt.homedir_cache, name, NULL); + dir = gnupg_opendir (fname); + if (!dir) + { + log_info (_("creating directory '%s'\n"), fname); + if (gnupg_mkdir (fname, "-rwx")) + { + int save_errno = errno; + log_error (_("error creating directory '%s': %s\n"), + fname, strerror (errno)); + xfree (fname); + gpg_err_set_errno (save_errno); + return -1; + } + } + else + gnupg_closedir (dir); + xfree (fname); + return 0; +} + +/* Remove all files from the cache directory. If FORCE is not true, + some sanity checks on the filenames are done. Return 0 if + everything went fine. */ +static int +cleanup_cache_dir (int force) +{ + char *dname = make_filename (opt.homedir_cache, DBDIR_D, NULL); + gnupg_dir_t dir; + gnupg_dirent_t de; + int problem = 0; + + if (!force) + { /* Very minor sanity checks. */ + if (!strcmp (dname, "~/") || !strcmp (dname, "/" )) + { + log_error (_("ignoring database dir '%s'\n"), dname); + xfree (dname); + return -1; + } + } + + dir = gnupg_opendir (dname); + if (!dir) + { + log_error (_("error reading directory '%s': %s\n"), + dname, strerror (errno)); + xfree (dname); + return -1; + } + + while ((de = gnupg_readdir (dir))) + { + if (strcmp (de->d_name, "." ) && strcmp (de->d_name, "..")) + { + char *cdbname = make_filename (dname, de->d_name, NULL); + int okay; + struct stat sbuf; + + if (force) + okay = 1; + else + okay = (!gnupg_stat (cdbname, &sbuf) && S_ISREG (sbuf.st_mode)); + + if (okay) + { + log_info (_("removing cache file '%s'\n"), cdbname); + if (gnupg_remove (cdbname)) + { + log_error ("failed to remove '%s': %s\n", + cdbname, strerror (errno)); + problem = -1; + } + } + else + log_info (_("not removing file '%s'\n"), cdbname); + xfree (cdbname); + } + } + xfree (dname); + gnupg_closedir (dir); + return problem; +} + + +/* Read the next line from the file FP and return the line in an + malloced buffer. Return NULL on error or EOF. There is no + limitation os the line length. The trailing linefeed has been + removed, the function will read the last line of a file, even if + that is not terminated by a LF. */ +static char * +next_line_from_file (estream_t fp, gpg_error_t *r_err) +{ + char buf[300]; + char *largebuf = NULL; + size_t buflen; + size_t len = 0; + unsigned char *p; + int c; + char *tmpbuf; + + *r_err = 0; + p = buf; + buflen = sizeof buf - 1; + while ((c=es_getc (fp)) != EOF && c != '\n') + { + if (len >= buflen) + { + if (!largebuf) + { + buflen += 1024; + largebuf = xtrymalloc ( buflen + 1 ); + if (!largebuf) + { + *r_err = gpg_error_from_syserror (); + return NULL; + } + memcpy (largebuf, buf, len); + } + else + { + buflen += 1024; + tmpbuf = xtryrealloc (largebuf, buflen + 1); + if (!tmpbuf) + { + *r_err = gpg_error_from_syserror (); + xfree (largebuf); + return NULL; + } + largebuf = tmpbuf; + } + p = largebuf; + } + p[len++] = c; + } + if (c == EOF && !len) + return NULL; + p[len] = 0; + + if (largebuf) + tmpbuf = xtryrealloc (largebuf, len+1); + else + tmpbuf = xtrystrdup (buf); + if (!tmpbuf) + { + *r_err = gpg_error_from_syserror (); + xfree (largebuf); + } + return tmpbuf; +} + + +/* Release one cache entry. */ +static void +release_one_cache_entry (crl_cache_entry_t entry) +{ + if (entry) + { + if (entry->cdb) + { + int fd = cdb_fileno (entry->cdb); + cdb_free (entry->cdb); + xfree (entry->cdb); + if (close (fd)) + log_error (_("error closing cache file: %s\n"), strerror(errno)); + } + xfree (entry->release_ptr); + xfree (entry->check_trust_anchor); + xfree (entry); + } +} + + +/* Release the CACHE object. */ +static void +release_cache (crl_cache_t cache) +{ + crl_cache_entry_t entry, entry2; + + if (!cache) + return; + + for (entry = cache->entries; entry; entry = entry2) + { + entry2 = entry->next; + release_one_cache_entry (entry); + } + cache->entries = NULL; + xfree (cache); +} + + +/* Open the dir file FNAME or create a new one if it does not yet + exist. */ +static estream_t +open_dir_file (const char *fname) +{ + estream_t fp; + + fp = es_fopen (fname, "r"); + if (!fp) + { + log_error (_("failed to open cache dir file '%s': %s\n"), + fname, strerror (errno)); + + /* Make sure that the directory exists, try to create if otherwise. */ + if (create_directory_if_needed (NULL) + || create_directory_if_needed (DBDIR_D)) + return NULL; + fp = es_fopen (fname, "w"); + if (!fp) + { + log_error (_("error creating new cache dir file '%s': %s\n"), + fname, strerror (errno)); + return NULL; + } + es_fprintf (fp, "v:%d:\n", DBDIRVERSION); + if (es_ferror (fp)) + { + log_error (_("error writing new cache dir file '%s': %s\n"), + fname, strerror (errno)); + es_fclose (fp); + return NULL; + } + if (es_fclose (fp)) + { + log_error (_("error closing new cache dir file '%s': %s\n"), + fname, strerror (errno)); + return NULL; + } + + log_info (_("new cache dir file '%s' created\n"), fname); + + fp = es_fopen (fname, "r"); + if (!fp) + { + log_error (_("failed to re-open cache dir file '%s': %s\n"), + fname, strerror (errno)); + return NULL; + } + } + + return fp; +} + +/* Helper for open_dir. */ +static gpg_error_t +check_dir_version (estream_t *fpadr, const char *fname, + unsigned int *lineno, + int cleanup_on_mismatch) +{ + char *line; + gpg_error_t lineerr = 0; + estream_t fp = *fpadr; + int created = 0; + + retry: + while ((line = next_line_from_file (fp, &lineerr))) + { + ++*lineno; + if (*line == 'v' && line[1] == ':') + break; + else if (*line != '#') + { + log_error (_("first record of '%s' is not the version\n"), fname); + xfree (line); + return gpg_error (GPG_ERR_CONFIGURATION); + } + xfree (line); + } + if (lineerr) + return lineerr; + + /* The !line catches the case of an empty DIR file. We handle this + the same as a non-matching version. */ + if (!line || strtol (line+2, NULL, 10) != DBDIRVERSION) + { + if (!created && cleanup_on_mismatch) + { + log_error (_("old version of cache directory - cleaning up\n")); + es_fclose (fp); + *fpadr = NULL; + if (!cleanup_cache_dir (1)) + { + *lineno = 0; + fp = *fpadr = open_dir_file (fname); + if (!fp) + { + xfree (line); + return gpg_error (GPG_ERR_CONFIGURATION); + } + created = 1; + goto retry; + } + } + log_error (_("old version of cache directory - giving up\n")); + xfree (line); + return gpg_error (GPG_ERR_CONFIGURATION); + } + xfree (line); + return 0; +} + + +/* Open the dir file and read in all available information. Store + that in a newly allocated cache object and return that if + everything worked out fine. Create the cache directory and the dir + if it does not yet exist. Remove all files in that directory if + the version does not match. */ +static gpg_error_t +open_dir (crl_cache_t *r_cache) +{ + crl_cache_t cache; + char *fname; + char *line = NULL; + gpg_error_t lineerr = 0; + estream_t fp; + crl_cache_entry_t entry, *entrytail; + unsigned int lineno; + gpg_error_t err = 0; + int anyerr = 0; + + cache = xtrycalloc (1, sizeof *cache); + if (!cache) + return gpg_error_from_syserror (); + + fname = make_filename (opt.homedir_cache, DBDIR_D, DBDIRFILE, NULL); + + lineno = 0; + fp = open_dir_file (fname); + if (!fp) + { + err = gpg_error (GPG_ERR_CONFIGURATION); + goto leave; + } + + err = check_dir_version (&fp, fname, &lineno, 1); + if (err) + goto leave; + + + /* Read in all supported entries from the dir file. */ + cache->entries = NULL; + entrytail = &cache->entries; + xfree (line); + while ((line = next_line_from_file (fp, &lineerr))) + { + int fieldno; + char *p, *endp; + + lineno++; + if ( *line == 'c' || *line == 'u' || *line == 'i' ) + { + entry = xtrycalloc (1, sizeof *entry); + if (!entry) + { + err = gpg_error_from_syserror (); + goto leave; + } + entry->lineno = lineno; + entry->release_ptr = line; + if (*line == 'i') + { + entry->invalid = atoi (line+1); + if (entry->invalid < 1) + entry->invalid = 1; + } + else if (*line == 'u') + entry->user_trust_req = 1; + + for (fieldno=1, p = line; p; p = endp, fieldno++) + { + endp = strchr (p, ':'); + if (endp) + *endp++ = '\0'; + + switch (fieldno) + { + case 1: /* record type */ break; + case 2: entry->issuer_hash = p; break; + case 3: entry->issuer = unpercent_string (p); break; + case 4: entry->url = unpercent_string (p); break; + case 5: + strncpy (entry->this_update, p, 15); + entry->this_update[15] = 0; + break; + case 6: + strncpy (entry->next_update, p, 15); + entry->next_update[15] = 0; + break; + case 7: entry->dbfile_hash = p; break; + case 8: if (*p) entry->crl_number = p; break; + case 9: + if (*p) + entry->authority_issuer = unpercent_string (p); + break; + case 10: + if (*p) + entry->authority_serialno = unpercent_string (p); + break; + case 11: + if (*p) + entry->check_trust_anchor = xtrystrdup (p); + break; + default: + if (*p) + log_info (_("extra field detected in crl record of " + "'%s' line %u\n"), fname, lineno); + break; + } + } + + if (!entry->issuer_hash) + { + log_info (_("invalid line detected in '%s' line %u\n"), + fname, lineno); + xfree (entry); + entry = NULL; + } + else if (find_entry (cache->entries, entry->issuer_hash)) + { + /* Fixme: The duplicate checking used is not very + effective for large numbers of issuers. */ + log_info (_("duplicate entry detected in '%s' line %u\n"), + fname, lineno); + xfree (entry); + entry = NULL; + } + else + { + line = NULL; + *entrytail = entry; + entrytail = &entry->next; + } + } + else if (*line == '#') + ; + else + log_info (_("unsupported record type in '%s' line %u skipped\n"), + fname, lineno); + + if (line) + xfree (line); + } + if (lineerr) + { + err = lineerr; + log_error (_("error reading '%s': %s\n"), fname, gpg_strerror (err)); + goto leave; + } + if (es_ferror (fp)) + { + log_error (_("error reading '%s': %s\n"), fname, strerror (errno)); + err = gpg_error (GPG_ERR_CONFIGURATION); + goto leave; + } + + /* Now do some basic checks on the data. */ + for (entry = cache->entries; entry; entry = entry->next) + { + assert (entry->lineno); + if (strlen (entry->issuer_hash) != 40) + { + anyerr++; + log_error (_("invalid issuer hash in '%s' line %u\n"), + fname, entry->lineno); + } + else if ( !*entry->issuer ) + { + anyerr++; + log_error (_("no issuer DN in '%s' line %u\n"), + fname, entry->lineno); + } + else if ( check_isotime (entry->this_update) + || check_isotime (entry->next_update)) + { + anyerr++; + log_error (_("invalid timestamp in '%s' line %u\n"), + fname, entry->lineno); + } + + /* Checks not leading to an immediate fail. */ + if (strlen (entry->dbfile_hash) != 32) + log_info (_("WARNING: invalid cache file hash in '%s' line %u\n"), + fname, entry->lineno); + } + + if (anyerr) + { + log_error (_("detected errors in cache dir file\n")); + log_info (_("please check the reason and manually delete that file\n")); + err = gpg_error (GPG_ERR_CONFIGURATION); + } + + + leave: + es_fclose (fp); + xfree (line); + xfree (fname); + if (err) + { + release_cache (cache); + cache = NULL; + } + *r_cache = cache; + return err; +} + +static void +write_percented_string (const char *s, estream_t fp) +{ + for (; *s; s++) + if (*s == ':') + es_fputs ("%3A", fp); + else if (*s == '\n') + es_fputs ("%0A", fp); + else if (*s == '\r') + es_fputs ("%0D", fp); + else + es_putc (*s, fp); +} + + +static void +write_dir_line_crl (estream_t fp, crl_cache_entry_t e) +{ + if (e->invalid) + es_fprintf (fp, "i%d", e->invalid); + else if (e->user_trust_req) + es_putc ('u', fp); + else + es_putc ('c', fp); + es_putc (':', fp); + es_fputs (e->issuer_hash, fp); + es_putc (':', fp); + write_percented_string (e->issuer, fp); + es_putc (':', fp); + write_percented_string (e->url, fp); + es_putc (':', fp); + es_fwrite (e->this_update, 15, 1, fp); + es_putc (':', fp); + es_fwrite (e->next_update, 15, 1, fp); + es_putc (':', fp); + es_fputs (e->dbfile_hash, fp); + es_putc (':', fp); + if (e->crl_number) + es_fputs (e->crl_number, fp); + es_putc (':', fp); + if (e->authority_issuer) + write_percented_string (e->authority_issuer, fp); + es_putc (':', fp); + if (e->authority_serialno) + es_fputs (e->authority_serialno, fp); + es_putc (':', fp); + if (e->check_trust_anchor && e->user_trust_req) + es_fputs (e->check_trust_anchor, fp); + es_putc ('\n', fp); +} + + +/* Update the current dir file using the cache. */ +static gpg_error_t +update_dir (crl_cache_t cache) +{ + char *fname = NULL; + char *tmpfname = NULL; + char *line = NULL; + gpg_error_t lineerr = 0; + estream_t fp; + estream_t fpout = NULL; + crl_cache_entry_t e; + unsigned int lineno; + gpg_error_t err = 0; + + fname = make_filename (opt.homedir_cache, DBDIR_D, DBDIRFILE, NULL); + + /* Fixme: Take an update file lock here. */ + + for (e= cache->entries; e; e = e->next) + e->mark = 1; + + lineno = 0; + fp = es_fopen (fname, "r"); + if (!fp) + { + err = gpg_error_from_errno (errno); + log_error (_("failed to open cache dir file '%s': %s\n"), + fname, strerror (errno)); + goto leave; + } + err = check_dir_version (&fp, fname, &lineno, 0); + if (err) + goto leave; + es_rewind (fp); + lineno = 0; + + /* Create a temporary DIR file. */ + { + char *tmpbuf, *p; + const char *nodename; +#ifndef HAVE_W32_SYSTEM + struct utsname utsbuf; +#endif + +#ifdef HAVE_W32_SYSTEM + nodename = "unknown"; +#else + if (uname (&utsbuf)) + nodename = "unknown"; + else + nodename = utsbuf.nodename; +#endif + + gpgrt_asprintf (&tmpbuf, "DIR-tmp-%s-%u-%p.txt.tmp", + nodename, (unsigned int)getpid (), &tmpbuf); + if (!tmpbuf) + { + err = gpg_error_from_errno (errno); + log_error (_("failed to create temporary cache dir file '%s': %s\n"), + tmpfname, strerror (errno)); + goto leave; + } + for (p=tmpbuf; *p; p++) + if (*p == '/') + *p = '.'; + tmpfname = make_filename (opt.homedir_cache, DBDIR_D, tmpbuf, NULL); + xfree (tmpbuf); + } + fpout = es_fopen (tmpfname, "w"); + if (!fpout) + { + err = gpg_error_from_errno (errno); + log_error (_("failed to create temporary cache dir file '%s': %s\n"), + tmpfname, strerror (errno)); + goto leave; + } + + while ((line = next_line_from_file (fp, &lineerr))) + { + lineno++; + if (*line == 'c' || *line == 'u' || *line == 'i') + { + /* Extract the issuer hash field. */ + char *fieldp, *endp; + + fieldp = strchr (line, ':'); + endp = fieldp? strchr (++fieldp, ':') : NULL; + if (endp) + { + /* There should be no percent within the issuer hash + field, thus we can compare it pretty easily. */ + *endp = 0; + e = find_entry ( cache->entries, fieldp); + *endp = ':'; /* Restore original line. */ + if (e && e->deleted) + { + /* Marked for deletion, so don't write it. */ + e->mark = 0; + } + else if (e) + { + /* Yep, this is valid entry we know about; write it out */ + write_dir_line_crl (fpout, e); + e->mark = 0; + } + else + { /* We ignore entries we don't have in our cache + because they may have been added in the meantime + by other instances of dirmngr. */ + es_fprintf (fpout, "# Next line added by " + "another process; our pid is %lu\n", + (unsigned long)getpid ()); + es_fputs (line, fpout); + es_putc ('\n', fpout); + } + } + else + { + es_fputs ("# Invalid line detected: ", fpout); + es_fputs (line, fpout); + es_putc ('\n', fpout); + } + } + else + { + /* Write out all non CRL lines as they are. */ + es_fputs (line, fpout); + es_putc ('\n', fpout); + } + + xfree (line); + } + if (!es_ferror (fp) && !es_ferror (fpout) && !lineerr) + { + /* Write out the remaining entries. */ + for (e= cache->entries; e; e = e->next) + if (e->mark) + { + if (!e->deleted) + write_dir_line_crl (fpout, e); + e->mark = 0; + } + } + if (lineerr) + { + err = lineerr; + log_error (_("error reading '%s': %s\n"), fname, gpg_strerror (err)); + goto leave; + } + if (es_ferror (fp)) + { + err = gpg_error_from_errno (errno); + log_error (_("error reading '%s': %s\n"), fname, strerror (errno)); + } + if (es_ferror (fpout)) + { + err = gpg_error_from_errno (errno); + log_error (_("error writing '%s': %s\n"), tmpfname, strerror (errno)); + } + if (err) + goto leave; + + /* Rename the files. */ + es_fclose (fp); + fp = NULL; + if (es_fclose (fpout)) + { + err = gpg_error_from_errno (errno); + log_error (_("error closing '%s': %s\n"), tmpfname, strerror (errno)); + goto leave; + } + fpout = NULL; + +#ifdef HAVE_W32_SYSTEM + /* No atomic mv on W32 systems. */ + gnupg_remove (fname); +#endif + if (rename (tmpfname, fname)) + { + err = gpg_error_from_errno (errno); + log_error (_("error renaming '%s' to '%s': %s\n"), + tmpfname, fname, strerror (errno)); + goto leave; + } + + leave: + /* Fixme: Relinquish update lock. */ + xfree (line); + es_fclose (fp); + xfree (fname); + if (fpout) + { + es_fclose (fpout); + if (err && tmpfname) + gnupg_remove (tmpfname); + } + xfree (tmpfname); + return err; +} + + + + +/* Create the filename for the cache file from the 40 byte ISSUER_HASH + string. Caller must release the return string. */ +static char * +make_db_file_name (const char *issuer_hash) +{ + char bname[50]; + + assert (strlen (issuer_hash) == 40); + memcpy (bname, "crl-", 4); + memcpy (bname + 4, issuer_hash, 40); + strcpy (bname + 44, ".db"); + return make_filename (opt.homedir_cache, DBDIR_D, bname, NULL); +} + + +/* Hash the file FNAME and return the MD5 digest in MD5BUFFER. The + caller must allocate MD%buffer wityh at least 16 bytes. Returns 0 + on success. */ +static int +hash_dbfile (const char *fname, unsigned char *md5buffer) +{ + estream_t fp; + char *buffer; + size_t n; + gcry_md_hd_t md5; + gpg_error_t err; + + buffer = xtrymalloc (65536); + fp = buffer? es_fopen (fname, "rb") : NULL; + if (!fp) + { + log_error (_("can't hash '%s': %s\n"), fname, strerror (errno)); + xfree (buffer); + return -1; + } + + err = gcry_md_open (&md5, GCRY_MD_MD5, 0); + if (err) + { + log_error (_("error setting up MD5 hash context: %s\n"), + gpg_strerror (err)); + xfree (buffer); + es_fclose (fp); + return -1; + } + + /* We better hash some information about the cache file layout in. */ + sprintf (buffer, "%.100s/%.100s:%d", DBDIR_D, DBDIRFILE, DBDIRVERSION); + gcry_md_write (md5, buffer, strlen (buffer)); + + for (;;) + { + n = es_fread (buffer, 1, 65536, fp); + if (n < 65536 && es_ferror (fp)) + { + log_error (_("error hashing '%s': %s\n"), fname, strerror (errno)); + xfree (buffer); + es_fclose (fp); + gcry_md_close (md5); + return -1; + } + if (!n) + break; + gcry_md_write (md5, buffer, n); + } + es_fclose (fp); + xfree (buffer); + gcry_md_final (md5); + + memcpy (md5buffer, gcry_md_read (md5, GCRY_MD_MD5), 16); + gcry_md_close (md5); + return 0; +} + +/* Compare the file FNAME against the dexified MD5 hash MD5HASH and + return 0 if they match. */ +static int +check_dbfile (const char *fname, const char *md5hexvalue) +{ + unsigned char buffer1[16], buffer2[16]; + + if (strlen (md5hexvalue) != 32) + { + log_error (_("invalid formatted checksum for '%s'\n"), fname); + return -1; + } + unhexify (buffer1, md5hexvalue); + + if (hash_dbfile (fname, buffer2)) + return -1; + + return memcmp (buffer1, buffer2, 16); +} + + +/* Open the cache file for ENTRY. This function implements a caching + strategy and might close unused cache files. It is required to use + unlock_db_file after using the file. */ +static struct cdb * +lock_db_file (crl_cache_t cache, crl_cache_entry_t entry) +{ + char *fname; + int fd; + int open_count; + crl_cache_entry_t e; + + if (entry->cdb) + { + entry->cdb_use_count++; + return entry->cdb; + } + + for (open_count = 0, e = cache->entries; e; e = e->next) + { + if (e->cdb) + open_count++; +/* log_debug ("CACHE: cdb=%p use_count=%u lru_count=%u\n", */ +/* e->cdb,e->cdb_use_count,e->cdb_lru_count); */ + } + + /* If there are too many file open, find the least recent used DB + file and close it. Note that for Pth thread safeness we need to + use a loop here. */ + while (open_count >= MAX_OPEN_DB_FILES ) + { + crl_cache_entry_t last_e = NULL; + unsigned int last_lru = (unsigned int)(-1); + + for (e = cache->entries; e; e = e->next) + if (e->cdb && !e->cdb_use_count && e->cdb_lru_count < last_lru) + { + last_lru = e->cdb_lru_count; + last_e = e; + } + if (!last_e) + { + log_error (_("too many open cache files; can't open anymore\n")); + return NULL; + } + +/* log_debug ("CACHE: closing file at cdb=%p\n", last_e->cdb); */ + + fd = cdb_fileno (last_e->cdb); + cdb_free (last_e->cdb); + xfree (last_e->cdb); + last_e->cdb = NULL; + if (close (fd)) + log_error (_("error closing cache file: %s\n"), strerror(errno)); + open_count--; + } + + + fname = make_db_file_name (entry->issuer_hash); + if (opt.verbose) + log_info (_("opening cache file '%s'\n"), fname ); + + if (!entry->dbfile_checked) + { + if (!check_dbfile (fname, entry->dbfile_hash)) + entry->dbfile_checked = 1; + /* Note, in case of an error we don't print an error here but + let require the caller to do that check. */ + } + + entry->cdb = xtrycalloc (1, sizeof *entry->cdb); + if (!entry->cdb) + { + xfree (fname); + return NULL; + } + fd = gnupg_open (fname, O_RDONLY | O_BINARY, 0); + if (fd == -1) + { + log_error (_("error opening cache file '%s': %s\n"), + fname, strerror (errno)); + xfree (entry->cdb); + entry->cdb = NULL; + xfree (fname); + return NULL; + } + if (cdb_init (entry->cdb, fd)) + { + log_error (_("error initializing cache file '%s' for reading: %s\n"), + fname, strerror (errno)); + xfree (entry->cdb); + entry->cdb = NULL; + close (fd); + xfree (fname); + return NULL; + } + xfree (fname); + + entry->cdb_use_count = 1; + entry->cdb_lru_count = 0; + + return entry->cdb; +} + +/* Unlock a cache file, so that it can be reused. */ +static void +unlock_db_file (crl_cache_t cache, crl_cache_entry_t entry) +{ + if (!entry->cdb) + log_error (_("calling unlock_db_file on a closed file\n")); + else if (!entry->cdb_use_count) + log_error (_("calling unlock_db_file on an unlocked file\n")); + else + { + entry->cdb_use_count--; + entry->cdb_lru_count++; + } + + /* If the entry was marked for deletion in the meantime do it now. + We do this for the sake of Pth thread safeness. */ + if (!entry->cdb_use_count && entry->deleted) + { + crl_cache_entry_t eprev, enext; + + enext = entry->next; + for (eprev = cache->entries; + eprev && eprev->next != entry; eprev = eprev->next) + ; + assert (eprev); + if (eprev == cache->entries) + cache->entries = enext; + else + eprev->next = enext; + /* FIXME: Do we leak ENTRY? */ + } +} + + +/* Find ISSUER_HASH in our cache FIRST. This may be used to enumerate + the linked list we use to keep the CRLs of an issuer. */ +static crl_cache_entry_t +find_entry (crl_cache_entry_t first, const char *issuer_hash) +{ + while (first && (first->deleted || strcmp (issuer_hash, first->issuer_hash))) + first = first->next; + return first; +} + + +/* Create a new CRL cache. This function is usually called only once. + never fail. */ +void +crl_cache_init(void) +{ + crl_cache_t cache = NULL; + gpg_error_t err; + + if (current_cache) + { + log_error ("crl cache has already been initialized - not doing twice\n"); + return; + } + + err = open_dir (&cache); + if (err) + log_fatal (_("failed to create a new cache object: %s\n"), + gpg_strerror (err)); + current_cache = cache; +} + + +/* Remove the cache information and all its resources. Note that we + still keep the cache on disk. */ +void +crl_cache_deinit (void) +{ + if (current_cache) + { + release_cache (current_cache); + current_cache = NULL; + } +} + + +/* Delete the cache from disk and memory. Return 0 on success.*/ +int +crl_cache_flush (void) +{ + int rc; + + crl_cache_deinit (); + rc = cleanup_cache_dir (0)? -1 : 0; + crl_cache_init (); + + return rc; +} + + +/* Check whether the certificate identified by ISSUER_HASH and + SN/SNLEN is valid; i.e. not listed in our cache. With + FORCE_REFRESH set to true, a new CRL will be retrieved even if the + cache has not yet expired. We use a 30 minutes threshold here so + that invoking this function several times won't load the CRL over + and over. */ +static crl_cache_result_t +cache_isvalid (ctrl_t ctrl, const char *issuer_hash, + const unsigned char *sn, size_t snlen, + int force_refresh) +{ + crl_cache_t cache = get_current_cache (); + crl_cache_result_t retval; + struct cdb *cdb; + int rc; + crl_cache_entry_t entry; + gnupg_isotime_t current_time; + size_t n; + + (void)ctrl; + + entry = find_entry (cache->entries, issuer_hash); + if (!entry) + { + log_info (_("no CRL available for issuer id %s\n"), issuer_hash ); + return CRL_CACHE_DONTKNOW; + } + + gnupg_get_isotime (current_time); + if (strcmp (entry->next_update, current_time) < 0 ) + { + log_info (_("cached CRL for issuer id %s too old; update required\n"), + issuer_hash); + return CRL_CACHE_DONTKNOW; + } + if (force_refresh) + { + gnupg_isotime_t tmptime; + + if (*entry->last_refresh) + { + gnupg_copy_time (tmptime, entry->last_refresh); + add_seconds_to_isotime (tmptime, 30 * 60); + if (strcmp (tmptime, current_time) < 0 ) + { + log_info (_("force-crl-refresh active and %d minutes passed for" + " issuer id %s; update required\n"), + 30, issuer_hash); + return CRL_CACHE_DONTKNOW; + } + } + else + { + log_info (_("force-crl-refresh active for" + " issuer id %s; update required\n"), + issuer_hash); + return CRL_CACHE_DONTKNOW; + } + } + + if (entry->invalid) + { + log_info (_("available CRL for issuer ID %s can't be used\n"), + issuer_hash); + return CRL_CACHE_CANTUSE; + } + + cdb = lock_db_file (cache, entry); + if (!cdb) + return CRL_CACHE_DONTKNOW; /* Hmmm, not the best error code. */ + + if (!entry->dbfile_checked) + { + log_error (_("cached CRL for issuer id %s tampered; we need to update\n") + , issuer_hash); + unlock_db_file (cache, entry); + return CRL_CACHE_DONTKNOW; + } + + rc = cdb_find (cdb, sn, snlen); + if (rc == 1) + { + n = cdb_datalen (cdb); + if (n != 16) + { + log_error (_("WARNING: invalid cache record length for S/N ")); + log_printf ("0x"); + log_printhex (sn, snlen, ""); + } + else if (opt.verbose) + { + unsigned char record[16]; + char *tmp = hexify_data (sn, snlen, 1); + + if (cdb_read (cdb, record, n, cdb_datapos (cdb))) + log_error (_("problem reading cache record for S/N %s: %s\n"), + tmp, strerror (errno)); + else + log_info (_("S/N %s is not valid; reason=%02X date=%.15s\n"), + tmp, *record, record+1); + xfree (tmp); + } + retval = CRL_CACHE_INVALID; + } + else if (!rc) + { + if (opt.verbose) + { + char *serialno = hexify_data (sn, snlen, 1); + log_info (_("S/N %s is valid, it is not listed in the CRL\n"), + serialno ); + xfree (serialno); + } + retval = CRL_CACHE_VALID; + } + else + { + log_error (_("error getting data from cache file: %s\n"), + strerror (errno)); + retval = CRL_CACHE_DONTKNOW; + } + + + if (entry->user_trust_req + && (retval == CRL_CACHE_VALID || retval == CRL_CACHE_INVALID)) + { + if (!entry->check_trust_anchor) + { + log_error ("inconsistent data on user trust check\n"); + retval = CRL_CACHE_CANTUSE; + } + else if (get_istrusted_from_client (ctrl, entry->check_trust_anchor)) + { + if (opt.verbose) + log_info ("no system trust and client does not trust either\n"); + retval = CRL_CACHE_CANTUSE; + } + else + { + /* Okay, the CRL is considered valid by the client and thus + we can return the result as is. */ + } + } + + unlock_db_file (cache, entry); + + return retval; +} + + +/* Check whether the certificate identified by ISSUER_HASH and + SERIALNO is valid; i.e. not listed in our cache. With + FORCE_REFRESH set to true, a new CRL will be retrieved even if the + cache has not yet expired. We use a 30 minutes threshold here so + that invoking this function several times won't load the CRL over + and over. */ +crl_cache_result_t +crl_cache_isvalid (ctrl_t ctrl, const char *issuer_hash, const char *serialno, + int force_refresh) +{ + crl_cache_result_t result; + unsigned char snbuf_buffer[50]; + unsigned char *snbuf; + size_t n; + + n = strlen (serialno)/2+1; + if (n < sizeof snbuf_buffer - 1) + snbuf = snbuf_buffer; + else + { + snbuf = xtrymalloc (n); + if (!snbuf) + return CRL_CACHE_DONTKNOW; + } + + n = unhexify (snbuf, serialno); + + result = cache_isvalid (ctrl, issuer_hash, snbuf, n, force_refresh); + + if (snbuf != snbuf_buffer) + xfree (snbuf); + + return result; +} + + +/* Check whether the certificate CERT is valid; i.e. not listed in our + cache. With FORCE_REFRESH set to true, a new CRL will be retrieved + even if the cache has not yet expired. We use a 30 minutes + threshold here so that invoking this function several times won't + load the CRL over and over. */ +gpg_error_t +crl_cache_cert_isvalid (ctrl_t ctrl, ksba_cert_t cert, + int force_refresh) +{ + gpg_error_t err; + crl_cache_result_t result; + unsigned char issuerhash[20]; + char issuerhash_hex[41]; + ksba_sexp_t serial; + unsigned char *sn; + size_t snlen; + char *endp, *tmp; + int i; + + /* Compute the hash value of the issuer name. */ + tmp = ksba_cert_get_issuer (cert, 0); + if (!tmp) + { + log_error ("oops: issuer missing in certificate\n"); + return gpg_error (GPG_ERR_INV_CERT_OBJ); + } + gcry_md_hash_buffer (GCRY_MD_SHA1, issuerhash, tmp, strlen (tmp)); + xfree (tmp); + for (i=0,tmp=issuerhash_hex; i < 20; i++, tmp += 2) + sprintf (tmp, "%02X", issuerhash[i]); + + /* Get the serial number. */ + serial = ksba_cert_get_serial (cert); + if (!serial) + { + log_error ("oops: S/N missing in certificate\n"); + return gpg_error (GPG_ERR_INV_CERT_OBJ); + } + sn = serial; + if (*sn != '(') + { + log_error ("oops: invalid S/N\n"); + xfree (serial); + return gpg_error (GPG_ERR_INV_CERT_OBJ); + } + sn++; + snlen = strtoul (sn, &endp, 10); + sn = endp; + if (*sn != ':') + { + log_error ("oops: invalid S/N\n"); + xfree (serial); + return gpg_error (GPG_ERR_INV_CERT_OBJ); + } + sn++; + + /* Check the cache. */ + result = cache_isvalid (ctrl, issuerhash_hex, sn, snlen, force_refresh); + switch (result) + { + case CRL_CACHE_VALID: + err = 0; + break; + case CRL_CACHE_INVALID: + err = gpg_error (GPG_ERR_CERT_REVOKED); + break; + case CRL_CACHE_DONTKNOW: + err = gpg_error (GPG_ERR_NO_CRL_KNOWN); + break; + case CRL_CACHE_CANTUSE: + err = gpg_error (GPG_ERR_NO_CRL_KNOWN); + break; + default: + log_fatal ("cache_isvalid returned invalid status code %d\n", result); + } + + xfree (serial); + return err; +} + + +/* Return the hash algorithm's algo id from its name given in the + * non-null termnated string in (buffer,buflen). Returns 0 on failure + * or if the algo is not known. */ +static int +hash_algo_from_buffer (const void *buffer, size_t buflen) +{ + char *string; + int algo; + + string = xtrymalloc (buflen + 1); + if (!string) + { + log_error (_("out of core\n")); + return 0; + } + memcpy (string, buffer, buflen); + string[buflen] = 0; + algo = gcry_md_map_name (string); + if (!algo) + log_error ("unknown digest algorithm '%s' used in certificate\n", string); + xfree (string); + return algo; +} + + +/* Return an unsigned integer from the non-null termnated string + * (buffer,buflen). Returns 0 on failure. */ +static unsigned int +uint_from_buffer (const void *buffer, size_t buflen) +{ + char *string; + unsigned int val; + + string = xtrymalloc (buflen + 1); + if (!string) + { + log_error (_("out of core\n")); + return 0; + } + memcpy (string, buffer, buflen); + string[buflen] = 0; + val = strtoul (string, NULL, 10); + xfree (string); + return val; +} + + +/* Prepare a hash context for the signature verification. Input is + the CRL and the output is the hash context MD as well as the uses + algorithm identifier ALGO. */ +static gpg_error_t +start_sig_check (ksba_crl_t crl, gcry_md_hd_t *md, int *algo, int *use_pss) +{ + gpg_error_t err; + const char *algoid; + + *use_pss = 0; + algoid = ksba_crl_get_digest_algo (crl); + if (algoid && !strcmp (algoid, "1.2.840.113549.1.1.10")) + { + /* Parse rsaPSS parameter. */ + gcry_buffer_t ioarray[1] = { {0} }; + ksba_sexp_t pssparam; + size_t n; + gcry_sexp_t psssexp; + + pssparam = ksba_crl_get_sig_val (crl); + n = gcry_sexp_canon_len (pssparam, 0, NULL, NULL); + if (!n) + { + ksba_free (pssparam); + log_error (_("got an invalid S-expression from libksba\n")); + return gpg_error (GPG_ERR_INV_SEXP); + } + err = gcry_sexp_sscan (&psssexp, NULL, pssparam, n); + ksba_free (pssparam); + if (err) + { + log_error (_("converting S-expression failed: %s\n"), + gcry_strerror (err)); + return err; + } + + err = gcry_sexp_extract_param (psssexp, "sig-val", + "&'hash-algo'", ioarray, NULL); + gcry_sexp_release (psssexp); + if (err) + { + log_error ("extracting params from PSS failed: %s\n", + gpg_strerror (err)); + return err; + } + *algo = hash_algo_from_buffer (ioarray[0].data, ioarray[0].len); + xfree (ioarray[0].data); + *use_pss = 1; + } + else + *algo = gcry_md_map_name (algoid); + if (!*algo) + { + log_error (_("unknown hash algorithm '%s'\n"), algoid? algoid:"?"); + return gpg_error (GPG_ERR_DIGEST_ALGO); + } + + err = gcry_md_open (md, *algo, 0); + if (err) + { + log_error (_("gcry_md_open for algorithm %d failed: %s\n"), + *algo, gcry_strerror (err)); + return err; + } + if (DBG_HASHING) + gcry_md_debug (*md, "hash.cert"); + + ksba_crl_set_hash_function (crl, HASH_FNC, *md); + return 0; +} + + +/* Finish a hash context and verify the signature. This function + should return 0 on a good signature, GPG_ERR_BAD_SIGNATURE if the + signature does not verify or any other error code. CRL is the CRL + object we are working on, MD the hash context and ISSUER_CERT the + certificate of the CRL issuer. This function takes ownership of MD. */ +static gpg_error_t +finish_sig_check (ksba_crl_t crl, gcry_md_hd_t md, int algo, + ksba_cert_t issuer_cert, int use_pss) +{ + gpg_error_t err; + ksba_sexp_t sigval = NULL, pubkey = NULL; + size_t n; + gcry_sexp_t s_sig = NULL, s_hash = NULL, s_pkey = NULL; + unsigned int saltlen = 0; /* (used only with use_pss) */ + + /* This also stops debugging on the MD. */ + gcry_md_final (md); + + /* Get and convert the signature value. */ + sigval = ksba_crl_get_sig_val (crl); + n = gcry_sexp_canon_len (sigval, 0, NULL, NULL); + if (!n) + { + log_error (_("got an invalid S-expression from libksba\n")); + err = gpg_error (GPG_ERR_INV_SEXP); + goto leave; + } + err = gcry_sexp_sscan (&s_sig, NULL, sigval, n); + if (err) + { + log_error (_("converting S-expression failed: %s\n"), + gcry_strerror (err)); + goto leave; + } + + if (use_pss) + { + /* Parse rsaPSS parameter which we should find in S_SIG. */ + gcry_buffer_t ioarray[2] = { {0}, {0} }; + ksba_sexp_t pssparam; + gcry_sexp_t psssexp; + int hashalgo; + + pssparam = ksba_crl_get_sig_val (crl); + n = gcry_sexp_canon_len (pssparam, 0, NULL, NULL); + if (!n) + { + ksba_free (pssparam); + log_error (_("got an invalid S-expression from libksba\n")); + err = gpg_error (GPG_ERR_INV_SEXP); + goto leave; + } + err = gcry_sexp_sscan (&psssexp, NULL, pssparam, n); + ksba_free (pssparam); + if (err) + { + log_error (_("converting S-expression failed: %s\n"), + gcry_strerror (err)); + goto leave; + } + + err = gcry_sexp_extract_param (psssexp, "sig-val", + "&'hash-algo''salt-length'", + ioarray+0, ioarray+1, NULL); + gcry_sexp_release (psssexp); + if (err) + { + log_error ("extracting params from PSS failed: %s\n", + gpg_strerror (err)); + goto leave; + } + hashalgo = hash_algo_from_buffer (ioarray[0].data, ioarray[0].len); + saltlen = uint_from_buffer (ioarray[1].data, ioarray[1].len); + xfree (ioarray[0].data); + xfree (ioarray[1].data); + if (hashalgo != algo) + { + log_error ("hash algo mismatch: %d announced but %d used\n", + algo, hashalgo); + return gpg_error (GPG_ERR_INV_CRL); + } + /* Add some restrictions; see ../sm/certcheck.c for details. */ + switch (algo) + { + case GCRY_MD_SHA1: + case GCRY_MD_SHA256: + case GCRY_MD_SHA384: + case GCRY_MD_SHA512: + case GCRY_MD_SHA3_256: + case GCRY_MD_SHA3_384: + case GCRY_MD_SHA3_512: + break; + default: + log_error ("PSS hash algorithm '%s' rejected\n", + gcry_md_algo_name (algo)); + return gpg_error (GPG_ERR_DIGEST_ALGO); + } + + if (gcry_md_get_algo_dlen (algo) != saltlen) + { + log_error ("PSS hash algorithm '%s' rejected due to salt length %u\n", + gcry_md_algo_name (algo), saltlen); + return gpg_error (GPG_ERR_DIGEST_ALGO); + } + } + + + /* Get and convert the public key for the issuer certificate. */ + if (DBG_X509) + dump_cert ("crl_issuer_cert", issuer_cert); + pubkey = ksba_cert_get_public_key (issuer_cert); + n = gcry_sexp_canon_len (pubkey, 0, NULL, NULL); + if (!n) + { + log_error (_("got an invalid S-expression from libksba\n")); + err = gpg_error (GPG_ERR_INV_SEXP); + goto leave; + } + err = gcry_sexp_sscan (&s_pkey, NULL, pubkey, n); + if (err) + { + log_error (_("converting S-expression failed: %s\n"), + gcry_strerror (err)); + goto leave; + } + + /* Create an S-expression with the actual hash value. */ + if (use_pss) + { + err = gcry_sexp_build (&s_hash, NULL, + "(data (flags pss)" + "(hash %s %b)" + "(salt-length %u))", + hash_algo_to_string (algo), + (int)gcry_md_get_algo_dlen (algo), + gcry_md_read (md, algo), + saltlen); + } + else + { + err = gcry_sexp_build (&s_hash, NULL, + "(data(flags pkcs1)(hash %s %b))", + hash_algo_to_string (algo), + (int)gcry_md_get_algo_dlen (algo), + gcry_md_read (md, algo)); + } + if (err) + { + log_error (_("creating S-expression failed: %s\n"), gcry_strerror (err)); + goto leave; + } + + /* Pass this on to the signature verification. */ + err = gcry_pk_verify (s_sig, s_hash, s_pkey); + if (DBG_X509) + log_debug ("gcry_pk_verify: %s\n", gpg_strerror (err)); + + leave: + xfree (sigval); + xfree (pubkey); + gcry_sexp_release (s_sig); + gcry_sexp_release (s_hash); + gcry_sexp_release (s_pkey); + gcry_md_close (md); + + return err; +} + + +/* Call this to match a start_sig_check that can not be completed + normally. Takes ownership of MD if MD is not NULL. */ +static void +abort_sig_check (ksba_crl_t crl, gcry_md_hd_t md) +{ + (void)crl; + if (md) + gcry_md_close (md); +} + + +/* Workhorse of the CRL loading machinery. The CRL is read using the + CRL object and stored in the data base file DB with the name FNAME + (only used for printing error messages). That DB should be a + temporary one and not the actual one. If the function fails the + caller should delete this temporary database file. CTRL is + required to retrieve certificates using the general dirmngr + callback service. R_CRLISSUER returns an allocated string with the + crl-issuer DN, THIS_UPDATE and NEXT_UPDATE are filled with the + corresponding data from the CRL. Note that these values might get + set even if the CRL processing fails at a later step; thus the + caller should free *R_ISSUER even if the function returns with an + error. R_TRUST_ANCHOR is set on exit to NULL or a string with the + hexified fingerprint of the root certificate, if checking this + certificate for trustiness is required. +*/ +static int +crl_parse_insert (ctrl_t ctrl, ksba_crl_t crl, + struct cdb_make *cdb, const char *fname, + char **r_crlissuer, + ksba_isotime_t thisupdate, ksba_isotime_t nextupdate, + char **r_trust_anchor) +{ + gpg_error_t err; + ksba_stop_reason_t stopreason; + ksba_cert_t crlissuer_cert = NULL; + gcry_md_hd_t md = NULL; + int algo = 0; + int use_pss = 0; + size_t n; + + (void)fname; + + *r_crlissuer = NULL; + *thisupdate = *nextupdate = 0; + *r_trust_anchor = NULL; + + /* Start of the KSBA parser loop. */ + do + { + err = ksba_crl_parse (crl, &stopreason); + if (err) + { + log_error (_("ksba_crl_parse failed: %s\n"), gpg_strerror (err) ); + goto failure; + } + + switch (stopreason) + { + case KSBA_SR_BEGIN_ITEMS: + { + err = start_sig_check (crl, &md, &algo, &use_pss); + if (err) + goto failure; + + err = ksba_crl_get_update_times (crl, thisupdate, nextupdate); + if (err) + { + log_error (_("error getting update times of CRL: %s\n"), + gpg_strerror (err)); + err = gpg_error (GPG_ERR_INV_CRL); + goto failure; + } + + if (opt.verbose || !*nextupdate) + log_info (_("update times of this CRL: this=%s next=%s\n"), + thisupdate, nextupdate); + if (!*nextupdate) + { + log_info (_("nextUpdate not given; " + "assuming a validity period of one day\n")); + gnupg_copy_time (nextupdate, thisupdate); + add_seconds_to_isotime (nextupdate, 86400); + } + } + break; + + case KSBA_SR_GOT_ITEM: + { + ksba_sexp_t serial; + const unsigned char *p; + ksba_isotime_t rdate; + ksba_crl_reason_t reason; + int rc; + unsigned char record[1+15]; + + err = ksba_crl_get_item (crl, &serial, rdate, &reason); + if (err) + { + log_error (_("error getting CRL item: %s\n"), + gpg_strerror (err)); + err = gpg_error (GPG_ERR_INV_CRL); + ksba_free (serial); + goto failure; + } + p = serial_to_buffer (serial, &n); + if (!p) + BUG (); + record[0] = (reason & 0xff); + memcpy (record+1, rdate, 15); + rc = cdb_make_add (cdb, p, n, record, 1+15); + if (rc) + { + err = gpg_error_from_errno (errno); + log_error (_("error inserting item into " + "temporary cache file: %s\n"), + strerror (errno)); + goto failure; + } + + ksba_free (serial); + } + break; + + case KSBA_SR_END_ITEMS: + break; + + case KSBA_SR_READY: + { + char *crlissuer; + ksba_name_t authid; + ksba_sexp_t authidsn; + ksba_sexp_t keyid; + + /* We need to look for the issuer only after having read + all items. The issuer itselfs comes before the items + but the optional authorityKeyIdentifier comes after the + items. */ + err = ksba_crl_get_issuer (crl, &crlissuer); + if( err ) + { + log_error (_("no CRL issuer found in CRL: %s\n"), + gpg_strerror (err) ); + err = gpg_error (GPG_ERR_INV_CRL); + goto failure; + } + /* Note: This should be released by ksba_free, not xfree. + May need a memory reallocation dance. */ + *r_crlissuer = crlissuer; /* (Do it here so we don't need + to free it later) */ + + if (!ksba_crl_get_auth_key_id (crl, &keyid, &authid, &authidsn)) + { + const char *s; + + if (opt.verbose) + log_info (_("locating CRL issuer certificate by " + "authorityKeyIdentifier\n")); + + s = ksba_name_enum (authid, 0); + if (s && *authidsn) + crlissuer_cert = find_cert_bysn (ctrl, s, authidsn); + if (!crlissuer_cert && keyid) + crlissuer_cert = find_cert_bysubject (ctrl, + crlissuer, keyid); + + if (!crlissuer_cert) + { + log_info ("CRL issuer certificate "); + if (keyid) + { + log_printf ("{"); + dump_serial (keyid); + log_printf ("} "); + } + if (authidsn) + { + log_printf ("(#"); + dump_serial (authidsn); + log_printf ("/"); + dump_string (s); + log_printf (") "); + } + log_printf ("not found\n"); + } + ksba_name_release (authid); + xfree (authidsn); + xfree (keyid); + } + else + crlissuer_cert = find_cert_bysubject (ctrl, crlissuer, NULL); + err = 0; + if (!crlissuer_cert) + { + err = gpg_error (GPG_ERR_MISSING_CERT); + goto failure; + } + + err = finish_sig_check (crl, md, algo, crlissuer_cert, use_pss); + md = NULL; /* Closed. */ + if (err) + { + log_error (_("CRL signature verification failed: %s\n"), + gpg_strerror (err)); + goto failure; + } + + err = validate_cert_chain (ctrl, crlissuer_cert, NULL, + (VALIDATE_FLAG_TRUST_CONFIG + | VALIDATE_FLAG_CRL + | VALIDATE_FLAG_RECURSIVE), + r_trust_anchor); + if (err) + { + log_error (_("error checking validity of CRL " + "issuer certificate: %s\n"), + gpg_strerror (err)); + goto failure; + } + + } + break; + + default: + log_debug ("crl_parse_insert: unknown stop reason\n"); + err = gpg_error (GPG_ERR_BUG); + goto failure; + } + } + while (stopreason != KSBA_SR_READY); + assert (!err); + + + failure: + abort_sig_check (crl, md); + ksba_cert_release (crlissuer_cert); + return err; +} + + + +/* Return the crlNumber extension as an allocated hex string or NULL + if there is none. */ +static char * +get_crl_number (ksba_crl_t crl) +{ + gpg_error_t err; + ksba_sexp_t number; + char *string; + + err = ksba_crl_get_crl_number (crl, &number); + if (err) + return NULL; + string = serial_hex (number); + ksba_free (number); + return string; +} + + +/* Return the authorityKeyIdentifier or NULL if it is not available. + The issuer name may consists of several parts - they are delimted by + 0x01. */ +static char * +get_auth_key_id (ksba_crl_t crl, char **serialno) +{ + gpg_error_t err; + ksba_name_t name; + ksba_sexp_t sn; + int idx; + const char *s; + char *string; + size_t length; + + *serialno = NULL; + err = ksba_crl_get_auth_key_id (crl, NULL, &name, &sn); + if (err) + return NULL; + *serialno = serial_hex (sn); + ksba_free (sn); + + if (!name) + return xstrdup (""); + + length = 0; + for (idx=0; (s = ksba_name_enum (name, idx)); idx++) + { + char *p = ksba_name_get_uri (name, idx); + length += strlen (p?p:s) + 1; + xfree (p); + } + string = xtrymalloc (length+1); + if (string) + { + *string = 0; + for (idx=0; (s = ksba_name_enum (name, idx)); idx++) + { + char *p = ksba_name_get_uri (name, idx); + if (*string) + strcat (string, "\x01"); + strcat (string, p?p:s); + xfree (p); + } + } + ksba_name_release (name); + return string; +} + + + +/* Insert the CRL retrieved using URL into the cache specified by + CACHE. The CRL itself will be read from the stream FP and is + expected in binary format. + + Called by: + crl_cache_load + cmd_loadcrl + --load-crl + crl_cache_reload_crl + cmd_isvalid + cmd_checkcrl + cmd_loadcrl + --fetch-crl + + */ +gpg_error_t +crl_cache_insert (ctrl_t ctrl, const char *url, ksba_reader_t reader) +{ + crl_cache_t cache = get_current_cache (); + gpg_error_t err, err2; + ksba_crl_t crl; + char *fname = NULL; + char *newfname = NULL; + struct cdb_make cdb; + int fd_cdb = -1; + char *issuer = NULL; + char *issuer_hash = NULL; + ksba_isotime_t thisupdate, nextupdate; + crl_cache_entry_t entry = NULL; + crl_cache_entry_t e; + gnupg_isotime_t current_time; + char *checksum = NULL; + int invalidate_crl = 0; + int idx; + const char *oid; + int critical; + char *trust_anchor = NULL; + + /* FIXME: We should acquire a mutex for the URL, so that we don't + simultaneously enter the same CRL twice. However this needs to be + interweaved with the checking function.*/ + + err2 = 0; + + err = ksba_crl_new (&crl); + if (err) + { + log_error (_("ksba_crl_new failed: %s\n"), gpg_strerror (err)); + goto leave; + } + + err = ksba_crl_set_reader (crl, reader); + if ( err ) + { + log_error (_("ksba_crl_set_reader failed: %s\n"), gpg_strerror (err)); + goto leave; + } + + /* Create a temporary cache file to load the CRL into. */ + { + char *tmpfname, *p; + const char *nodename; +#ifndef HAVE_W32_SYSTEM + struct utsname utsbuf; +#endif + +#ifdef HAVE_W32_SYSTEM + nodename = "unknown"; +#else + if (uname (&utsbuf)) + nodename = "unknown"; + else + nodename = utsbuf.nodename; +#endif + + gpgrt_asprintf (&tmpfname, "crl-tmp-%s-%u-%p.db.tmp", + nodename, (unsigned int)getpid (), &tmpfname); + if (!tmpfname) + { + err = gpg_error_from_syserror (); + goto leave; + } + for (p=tmpfname; *p; p++) + if (*p == '/') + *p = '.'; + fname = make_filename (opt.homedir_cache, DBDIR_D, tmpfname, NULL); + xfree (tmpfname); + if (!gnupg_remove (fname)) + log_info (_("removed stale temporary cache file '%s'\n"), fname); + else if (errno != ENOENT) + { + err = gpg_error_from_syserror (); + log_error (_("problem removing stale temporary cache file '%s': %s\n"), + fname, gpg_strerror (err)); + goto leave; + } + } + + fd_cdb = gnupg_open (fname, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); + if (fd_cdb == -1) + { + err = gpg_error_from_errno (errno); + log_error (_("error creating temporary cache file '%s': %s\n"), + fname, strerror (errno)); + goto leave; + } + cdb_make_start(&cdb, fd_cdb); + + err = crl_parse_insert (ctrl, crl, &cdb, fname, + &issuer, thisupdate, nextupdate, &trust_anchor); + if (err) + { + log_error (_("crl_parse_insert failed: %s\n"), gpg_strerror (err)); + /* Error in cleanup ignored. */ + cdb_make_finish (&cdb); + goto leave; + } + + /* Finish the database. */ + if (cdb_make_finish (&cdb)) + { + err = gpg_error_from_errno (errno); + log_error (_("error finishing temporary cache file '%s': %s\n"), + fname, strerror (errno)); + goto leave; + } + if (close (fd_cdb)) + { + err = gpg_error_from_errno (errno); + log_error (_("error closing temporary cache file '%s': %s\n"), + fname, strerror (errno)); + goto leave; + } + fd_cdb = -1; + + + /* Create a checksum. */ + { + unsigned char md5buf[16]; + + if (hash_dbfile (fname, md5buf)) + { + err = gpg_error (GPG_ERR_CHECKSUM); + goto leave; + } + checksum = hexify_data (md5buf, 16, 0); + } + + + /* Check whether that new CRL is still not expired. */ + gnupg_get_isotime (current_time); + if (strcmp (nextupdate, current_time) < 0 ) + { + if (opt.force) + log_info (_("WARNING: new CRL still too old; it expired on %s " + "- loading anyway\n"), nextupdate); + else + { + log_error (_("new CRL still too old; it expired on %s\n"), + nextupdate); + if (!err2) + err2 = gpg_error (GPG_ERR_CRL_TOO_OLD); + invalidate_crl |= 1; + } + } + + /* Check for unknown critical extensions. */ + for (idx=0; !(err=ksba_crl_get_extension (crl, idx, &oid, &critical, + NULL, NULL)); idx++) + { + if (!critical + || !strcmp (oid, oidstr_authorityKeyIdentifier) + || !strcmp (oid, oidstr_crlNumber) ) + continue; + log_error (_("unknown critical CRL extension %s\n"), oid); + if (!err2) + err2 = gpg_error (GPG_ERR_INV_CRL); + invalidate_crl |= 2; + } + if (gpg_err_code (err) == GPG_ERR_EOF + || gpg_err_code (err) == GPG_ERR_NO_DATA ) + err = 0; + if (err) + { + log_error (_("error reading CRL extensions: %s\n"), gpg_strerror (err)); + err = gpg_error (GPG_ERR_INV_CRL); + } + + + /* Create an hex encoded SHA-1 hash of the issuer DN to be + used as the key for the cache. */ + issuer_hash = hashify_data (issuer, strlen (issuer)); + + /* Create an ENTRY. */ + entry = xtrycalloc (1, sizeof *entry); + if (!entry) + { + err = gpg_error_from_syserror (); + goto leave; + } + entry->release_ptr = xtrymalloc (strlen (issuer_hash) + 1 + + strlen (issuer) + 1 + + strlen (url) + 1 + + strlen (checksum) + 1); + if (!entry->release_ptr) + { + err = gpg_error_from_syserror (); + xfree (entry); + entry = NULL; + goto leave; + } + entry->issuer_hash = entry->release_ptr; + entry->issuer = stpcpy (entry->issuer_hash, issuer_hash) + 1; + entry->url = stpcpy (entry->issuer, issuer) + 1; + entry->dbfile_hash = stpcpy (entry->url, url) + 1; + strcpy (entry->dbfile_hash, checksum); + gnupg_copy_time (entry->this_update, thisupdate); + gnupg_copy_time (entry->next_update, nextupdate); + gnupg_copy_time (entry->last_refresh, current_time); + entry->crl_number = get_crl_number (crl); + entry->authority_issuer = get_auth_key_id (crl, &entry->authority_serialno); + entry->invalid = invalidate_crl; + entry->user_trust_req = !!trust_anchor; + entry->check_trust_anchor = trust_anchor; + trust_anchor = NULL; + + /* Check whether we already have an entry for this issuer and mark + it as deleted. We better use a loop, just in case duplicates got + somehow into the list. */ + for (e = cache->entries; (e=find_entry (e, entry->issuer_hash)); e = e->next) + e->deleted = 1; + + /* Rename the temporary DB to the real name. */ + newfname = make_db_file_name (entry->issuer_hash); + if (opt.verbose) + log_info (_("creating cache file '%s'\n"), newfname); + + /* Just in case close unused matching files. Actually we need this + only under Windows but saving file descriptors is never bad. */ + { + int any; + do + { + any = 0; + for (e = cache->entries; e; e = e->next) + if (!e->cdb_use_count && e->cdb + && !strcmp (e->issuer_hash, entry->issuer_hash)) + { + int fd = cdb_fileno (e->cdb); + cdb_free (e->cdb); + xfree (e->cdb); + e->cdb = NULL; + if (close (fd)) + log_error (_("error closing cache file: %s\n"), + strerror(errno)); + any = 1; + break; + } + } + while (any); + } +#ifdef HAVE_W32_SYSTEM + gnupg_remove (newfname); +#endif + if (rename (fname, newfname)) + { + err = gpg_error_from_syserror (); + log_error (_("problem renaming '%s' to '%s': %s\n"), + fname, newfname, gpg_strerror (err)); + goto leave; + } + xfree (fname); fname = NULL; /*(let the cleanup code not try to remove it)*/ + + /* Link the new entry in. */ + entry->next = cache->entries; + cache->entries = entry; + entry = NULL; + + err = update_dir (cache); + if (err) + { + log_error (_("updating the DIR file failed - " + "cache entry will get lost with the next program start\n")); + err = 0; /* Keep on running. */ + } + + + leave: + release_one_cache_entry (entry); + if (fd_cdb != -1) + close (fd_cdb); + if (fname) + { + gnupg_remove (fname); + xfree (fname); + } + xfree (newfname); + ksba_crl_release (crl); + xfree (issuer); + xfree (issuer_hash); + xfree (checksum); + xfree (trust_anchor); + return err ? err : err2; +} + + +/* Print one cached entry E in a human readable format to stream + FP. Return 0 on success. */ +static gpg_error_t +list_one_crl_entry (crl_cache_t cache, crl_cache_entry_t e, estream_t fp) +{ + struct cdb_find cdbfp; + struct cdb *cdb; + int rc; + int warn = 0; + const unsigned char *s; + + es_fputs ("--------------------------------------------------------\n", fp ); + es_fprintf (fp, _("Begin CRL dump (retrieved via %s)\n"), e->url ); + es_fprintf (fp, " Issuer:\t%s\n", e->issuer ); + es_fprintf (fp, " Issuer Hash:\t%s\n", e->issuer_hash ); + es_fprintf (fp, " This Update:\t%s\n", e->this_update ); + es_fprintf (fp, " Next Update:\t%s\n", e->next_update ); + es_fprintf (fp, " CRL Number :\t%s\n", e->crl_number? e->crl_number: "none"); + es_fprintf (fp, " AuthKeyId :\t%s\n", + e->authority_serialno? e->authority_serialno:"none"); + if (e->authority_serialno && e->authority_issuer) + { + es_fputs (" \t", fp); + for (s=e->authority_issuer; *s; s++) + if (*s == '\x01') + es_fputs ("\n \t", fp); + else + es_putc (*s, fp); + es_putc ('\n', fp); + } + es_fprintf (fp, " Trust Check:\t%s\n", + !e->user_trust_req? "[system]" : + e->check_trust_anchor? e->check_trust_anchor:"[missing]"); + + if ((e->invalid & 1)) + es_fprintf (fp, _(" ERROR: The CRL will not be used " + "because it was still too old after an update!\n")); + if ((e->invalid & 2)) + es_fprintf (fp, _(" ERROR: The CRL will not be used " + "due to an unknown critical extension!\n")); + if ((e->invalid & ~3)) + es_fprintf (fp, _(" ERROR: The CRL will not be used\n")); + + cdb = lock_db_file (cache, e); + if (!cdb) + return gpg_error (GPG_ERR_GENERAL); + + if (!e->dbfile_checked) + es_fprintf (fp, _(" ERROR: This cached CRL may have been tampered with!\n")); + + es_putc ('\n', fp); + + rc = cdb_findinit (&cdbfp, cdb, NULL, 0); + while (!rc && (rc=cdb_findnext (&cdbfp)) > 0 ) + { + unsigned char keyrecord[256]; + unsigned char record[16]; + int reason; + int any = 0; + cdbi_t n; + cdbi_t i; + + rc = 0; + n = cdb_datalen (cdb); + if (n != 16) + { + log_error (_(" WARNING: invalid cache record length\n")); + warn = 1; + continue; + } + + if (cdb_read (cdb, record, n, cdb_datapos (cdb))) + { + log_error (_("problem reading cache record: %s\n"), + strerror (errno)); + warn = 1; + continue; + } + + n = cdb_keylen (cdb); + if (n > sizeof keyrecord) + n = sizeof keyrecord; + if (cdb_read (cdb, keyrecord, n, cdb_keypos (cdb))) + { + log_error (_("problem reading cache key: %s\n"), strerror (errno)); + warn = 1; + continue; + } + + reason = *record; + es_fputs (" ", fp); + for (i = 0; i < n; i++) + es_fprintf (fp, "%02X", keyrecord[i]); + es_fputs (":\t reasons( ", fp); + + if (reason & KSBA_CRLREASON_UNSPECIFIED) + es_fputs( "unspecified ", fp ), any = 1; + if (reason & KSBA_CRLREASON_KEY_COMPROMISE ) + es_fputs( "key_compromise ", fp ), any = 1; + if (reason & KSBA_CRLREASON_CA_COMPROMISE ) + es_fputs( "ca_compromise ", fp ), any = 1; + if (reason & KSBA_CRLREASON_AFFILIATION_CHANGED ) + es_fputs( "affiliation_changed ", fp ), any = 1; + if (reason & KSBA_CRLREASON_SUPERSEDED ) + es_fputs( "superseded", fp ), any = 1; + if (reason & KSBA_CRLREASON_CESSATION_OF_OPERATION ) + es_fputs( "cessation_of_operation", fp ), any = 1; + if (reason & KSBA_CRLREASON_CERTIFICATE_HOLD ) + es_fputs( "certificate_hold", fp ), any = 1; + if (reason && !any) + es_fputs( "other", fp ); + + es_fprintf (fp, ") rdate: %.15s\n", record+1); + } + if (rc) + log_error (_("error reading cache entry from db: %s\n"), strerror (rc)); + + unlock_db_file (cache, e); + es_fprintf (fp, _("End CRL dump\n") ); + es_putc ('\n', fp); + + return (rc||warn)? gpg_error (GPG_ERR_GENERAL) : 0; +} + + +/* Print the contents of the CRL CACHE in a human readable format to + stream FP. */ +gpg_error_t +crl_cache_list (estream_t fp) +{ + crl_cache_t cache = get_current_cache (); + crl_cache_entry_t entry; + gpg_error_t err = 0; + + for (entry = cache->entries; + entry && !entry->deleted && !err; + entry = entry->next ) + err = list_one_crl_entry (cache, entry, fp); + + return err; +} + + +/* Load the CRL containing the file named FILENAME into our CRL cache. */ +gpg_error_t +crl_cache_load (ctrl_t ctrl, const char *filename) +{ + gpg_error_t err; + estream_t fp; + ksba_reader_t reader; + + fp = es_fopen (filename, "rb"); + if (!fp) + { + err = gpg_error_from_errno (errno); + log_error (_("can't open '%s': %s\n"), filename, strerror (errno)); + return err; + } + + err = create_estream_ksba_reader (&reader, fp); + if (!err) + { + err = crl_cache_insert (ctrl, filename, reader); + ksba_reader_release (reader); + } + es_fclose (fp); + return err; +} + + +/* Locate the corresponding CRL for the certificate CERT, read and + verify the CRL and store it in the cache. */ +gpg_error_t +crl_cache_reload_crl (ctrl_t ctrl, ksba_cert_t cert) +{ + gpg_error_t err; + ksba_reader_t reader = NULL; + char *issuer = NULL; + ksba_name_t distpoint = NULL; + ksba_name_t issuername = NULL; + char *distpoint_uri = NULL; + int any_dist_point = 0; + int seq; + gpg_error_t last_err = 0; + + /* Loop over all distribution points, get the CRLs and put them into + the cache. */ + if (opt.verbose) + log_info ("checking distribution points\n"); + seq = 0; + while (xfree (distpoint), xfree (issuername), + !(err = ksba_cert_get_crl_dist_point (cert, seq++, + &distpoint, + &issuername, NULL ))) + { + int name_seq; + + if (!distpoint && !issuername) + { + if (opt.verbose) + log_info ("no issuer name and no distribution point\n"); + break; /* Not allowed; i.e. an invalid certificate. We give + up here and hope that the default method returns a + suitable CRL. */ + } + + /* Get the URIs. We do this in a loop to iterate over all names + in the crlDP. */ + for (name_seq=0; ksba_name_enum (distpoint, name_seq); name_seq++) + { + xfree (distpoint_uri); + distpoint_uri = ksba_name_get_uri (distpoint, name_seq); + if (!distpoint_uri) + continue; + + if (!strncmp (distpoint_uri, "ldap:", 5) + || !strncmp (distpoint_uri, "ldaps:", 6)) + { + if (opt.ignore_ldap_dp) + continue; + } + else if (!strncmp (distpoint_uri, "http:", 5) + || !strncmp (distpoint_uri, "https:", 6)) + { + if (opt.ignore_http_dp) + continue; + } + else + continue; /* Skip unknown schemes. */ + + any_dist_point = 1; + + if (opt.verbose) + log_info ("fetching CRL from '%s'\n", distpoint_uri); + crl_close_reader (reader); + err = crl_fetch (ctrl, distpoint_uri, &reader); + if (err) + { + log_error (_("crl_fetch via DP failed: %s\n"), + gpg_strerror (err)); + last_err = err; + continue; /* with the next name. */ + } + + if (opt.verbose) + log_info ("inserting CRL (reader %p)\n", reader); + err = crl_cache_insert (ctrl, distpoint_uri, reader); + if (err) + { + log_error (_("crl_cache_insert via DP failed: %s\n"), + gpg_strerror (err)); + last_err = err; + continue; /* with the next name. */ + } + goto leave; /* Ready - we got the CRL. */ + } + } + if (gpg_err_code (err) == GPG_ERR_EOF) + err = 0; + if (!err && last_err) + { + err = last_err; + goto leave; + } + + /* If we did not found any distpoint, try something reasonable. */ + if (!any_dist_point ) + { + if (opt.verbose) + log_info ("no distribution point - trying issuer name\n"); + + issuer = ksba_cert_get_issuer (cert, 0); + if (!issuer) + { + log_error ("oops: issuer missing in certificate\n"); + err = gpg_error (GPG_ERR_INV_CERT_OBJ); + goto leave; + } + + if (opt.verbose) + log_info ("fetching CRL from default location\n"); + crl_close_reader (reader); + err = crl_fetch_default (ctrl, issuer, &reader); + if (err) + { + log_error ("crl_fetch via issuer failed: %s\n", + gpg_strerror (err)); + goto leave; + } + + if (opt.verbose) + log_info ("inserting CRL (reader %p)\n", reader); + err = crl_cache_insert (ctrl, "default location(s)", reader); + if (err) + { + log_error (_("crl_cache_insert via issuer failed: %s\n"), + gpg_strerror (err)); + goto leave; + } + } + + leave: + crl_close_reader (reader); + xfree (distpoint_uri); + ksba_name_release (distpoint); + ksba_name_release (issuername); + ksba_free (issuer); + return err; +} |