diff options
Diffstat (limited to 'sm/certchain.c')
| -rw-r--r-- | sm/certchain.c | 132 |
1 files changed, 108 insertions, 24 deletions
diff --git a/sm/certchain.c b/sm/certchain.c index a21a38a07..04b7e05ff 100644 --- a/sm/certchain.c +++ b/sm/certchain.c @@ -60,7 +60,7 @@ struct chain_item_s typedef struct chain_item_s *chain_item_t; -static int get_regtp_ca_info (ksba_cert_t cert, int *chainlen); +static int get_regtp_ca_info (ctrl_t ctrl, ksba_cert_t cert, int *chainlen); /* This function returns true if we already asked during this session @@ -259,7 +259,8 @@ unknown_criticals (ksba_cert_t cert, int listmode, estream_t fp) BasicConstraints extension. The function returns 0 on success and the awlloed length of the chain at CHAINLEN. */ static int -allowed_ca (ksba_cert_t cert, int *chainlen, int listmode, estream_t fp) +allowed_ca (ctrl_t ctrl, + ksba_cert_t cert, int *chainlen, int listmode, estream_t fp) { gpg_error_t err; int flag; @@ -269,7 +270,7 @@ allowed_ca (ksba_cert_t cert, int *chainlen, int listmode, estream_t fp) return err; if (!flag) { - if (get_regtp_ca_info (cert, chainlen)) + if (get_regtp_ca_info (ctrl, cert, chainlen)) { /* Note that dirmngr takes a different way to cope with such certs. */ @@ -417,7 +418,7 @@ check_cert_policy (ksba_cert_t cert, int listmode, estream_t fplist) /* Helper function for find_up. This resets the key handle and search for an issuer ISSUER with a subjectKeyIdentifier of KEYID. Returns - 0 obn success or -1 when not found. */ + 0 on success or -1 when not found. */ static int find_up_search_by_keyid (KEYDB_HANDLE kh, const char *issuer, ksba_sexp_t keyid) @@ -464,9 +465,10 @@ find_up_store_certs_cb (void *cb_value, ksba_cert_t cert) external lookup. KH is the keydb context we are currently using. On success 0 is returned and the certificate may be retrieved from the keydb using keydb_get_cert(). KEYID is the keyIdentifier from - the AKI or NULL. */ + the AKI or NULL. */ static int -find_up_external (KEYDB_HANDLE kh, const char *issuer, ksba_sexp_t keyid) +find_up_external (ctrl_t ctrl, KEYDB_HANDLE kh, + const char *issuer, ksba_sexp_t keyid) { int rc; strlist_t names = NULL; @@ -476,14 +478,13 @@ find_up_external (KEYDB_HANDLE kh, const char *issuer, ksba_sexp_t keyid) if (opt.verbose) log_info (_("looking up issuer at external location\n")); - /* The DIRMNGR process is confused about unknown attributes. As a + /* The Dirmngr process is confused about unknown attributes. As a quick and ugly hack we locate the CN and use the issuer string starting at this attribite. Fixme: we should have far better - parsing in the dirmngr. */ + parsing for external lookups in the Dirmngr. */ s = strstr (issuer, "CN="); if (!s || s == issuer || s[-1] != ',') s = issuer; - pattern = xtrymalloc (strlen (s)+2); if (!pattern) return gpg_error_from_syserror (); @@ -491,7 +492,7 @@ find_up_external (KEYDB_HANDLE kh, const char *issuer, ksba_sexp_t keyid) add_to_strlist (&names, pattern); xfree (pattern); - rc = gpgsm_dirmngr_lookup (NULL, names, find_up_store_certs_cb, &count); + rc = gpgsm_dirmngr_lookup (ctrl, names, 0, find_up_store_certs_cb, &count); free_strlist (names); if (opt.verbose) @@ -522,6 +523,54 @@ find_up_external (KEYDB_HANDLE kh, const char *issuer, ksba_sexp_t keyid) } +/* Helper for find_up(). Ask the dirmngr for the certificate for + ISSUER with optional SERIALNO. KH is the keydb context we are + currently using. With SUBJECT_MODE set, ISSUER is searched as the + subject. On success 0 is returned and the certificate is available + in the ephemeral DB. */ +static int +find_up_dirmngr (ctrl_t ctrl, KEYDB_HANDLE kh, + ksba_sexp_t serialno, const char *issuer, int subject_mode) +{ + int rc; + strlist_t names = NULL; + int count = 0; + char *pattern; + + if (opt.verbose) + log_info (_("looking up issuer from the Dirmngr cache\n")); + if (subject_mode) + { + pattern = xtrymalloc (strlen (issuer)+2); + if (pattern) + strcpy (stpcpy (pattern, "/"), issuer); + } + else if (serialno) + pattern = gpgsm_format_sn_issuer (serialno, issuer); + else + { + pattern = xtrymalloc (strlen (issuer)+3); + if (pattern) + strcpy (stpcpy (pattern, "#/"), issuer); + } + if (!pattern) + return gpg_error_from_syserror (); + add_to_strlist (&names, pattern); + xfree (pattern); + + rc = gpgsm_dirmngr_lookup (ctrl, names, 1, find_up_store_certs_cb, &count); + free_strlist (names); + + if (opt.verbose) + log_info (_("number of matching certificates: %d\n"), count); + if (rc) + log_info (_("dirmngr cache-only key lookup failed: %s\n"), + gpg_strerror (rc)); + return (!rc && count)? 0 : -1; +} + + + /* Locate issuing certificate for CERT. ISSUER is the name of the issuer used as a fallback if the other methods don't work. If FIND_NEXT is true, the function shall return the next possible @@ -529,7 +578,8 @@ find_up_external (KEYDB_HANDLE kh, const char *issuer, ksba_sexp_t keyid) keydb_get_cert on the keyDb context KH will return it. Returns 0 on success, -1 if not found or an error code. */ static int -find_up (KEYDB_HANDLE kh, ksba_cert_t cert, const char *issuer, int find_next) +find_up (ctrl_t ctrl, KEYDB_HANDLE kh, + ksba_cert_t cert, const char *issuer, int find_next) { ksba_name_t authid; ksba_sexp_t authidno; @@ -545,6 +595,14 @@ find_up (KEYDB_HANDLE kh, ksba_cert_t cert, const char *issuer, int find_next) if (rc) keydb_search_reset (kh); + /* In case of an error, try to get the certifcate from the + dirmngr. That is done by trying to put that certifcate + into the ephemeral DB and let the code below do the + actual retrieve. Thus there is no error checking. + Skipped in find_next mode as usual. */ + if (rc == -1 && !find_next) + find_up_dirmngr (ctrl, kh, authidno, s, 0); + /* In case of an error try the ephemeral DB. We can't do that in find_next mode because we can't keep the search state then. */ @@ -559,7 +617,8 @@ find_up (KEYDB_HANDLE kh, ksba_cert_t cert, const char *issuer, int find_next) } keydb_set_ephemeral (kh, old); } - + if (rc) + rc = -1; /* Need to make sure to have this error code. */ } if (rc == -1 && keyid && !find_next) @@ -568,6 +627,7 @@ find_up (KEYDB_HANDLE kh, ksba_cert_t cert, const char *issuer, int find_next) instead. Loop over all certificates with that issuer as subject and stop for the one with a matching subjectKeyIdentifier. */ + /* Fixme: Should we also search in the dirmngr? */ rc = find_up_search_by_keyid (kh, issuer, keyid); if (rc) { @@ -580,9 +640,29 @@ find_up (KEYDB_HANDLE kh, ksba_cert_t cert, const char *issuer, int find_next) rc = -1; /* Need to make sure to have this error code. */ } + /* If we still didn't found it, try to find it via the subject + from the dirmngr-cache. */ + if (rc == -1 && !find_next) + { + if (!find_up_dirmngr (ctrl, kh, NULL, issuer, 1)) + { + int old = keydb_set_ephemeral (kh, 1); + if (keyid) + rc = find_up_search_by_keyid (kh, issuer, keyid); + else + { + keydb_search_reset (kh); + rc = keydb_search_subject (kh, issuer); + } + keydb_set_ephemeral (kh, old); + } + if (rc) + rc = -1; /* Need to make sure to have this error code. */ + } + /* If we still didn't found it, try an external lookup. */ if (rc == -1 && opt.auto_issuer_key_retrieve && !find_next) - rc = find_up_external (kh, issuer, keyid); + rc = find_up_external (ctrl, kh, issuer, keyid); /* Print a note so that the user does not feel too helpless when an issuer certificate was found and gpgsm prints BAD @@ -617,6 +697,10 @@ find_up (KEYDB_HANDLE kh, ksba_cert_t cert, const char *issuer, int find_next) rc = keydb_search_subject (kh, issuer); if (rc == -1 && !find_next) { + /* Also try to get it from the Dirmngr cache. The function + merely puts it into the ephemeral database. */ + find_up_dirmngr (ctrl, kh, NULL, issuer, 0); + /* Not found, let us see whether we have one in the ephemeral key DB. */ int old = keydb_set_ephemeral (kh, 1); if (!old) @@ -629,7 +713,7 @@ find_up (KEYDB_HANDLE kh, ksba_cert_t cert, const char *issuer, int find_next) /* Still not found. If enabled, try an external lookup. */ if (rc == -1 && opt.auto_issuer_key_retrieve && !find_next) - rc = find_up_external (kh, issuer, NULL); + rc = find_up_external (ctrl, kh, issuer, NULL); return rc; } @@ -638,7 +722,7 @@ find_up (KEYDB_HANDLE kh, ksba_cert_t cert, const char *issuer, int find_next) /* Return the next certificate up in the chain starting at START. Returns -1 when there are no more certificates. */ int -gpgsm_walk_cert_chain (ksba_cert_t start, ksba_cert_t *r_next) +gpgsm_walk_cert_chain (ctrl_t ctrl, ksba_cert_t start, ksba_cert_t *r_next) { int rc = 0; char *issuer = NULL; @@ -674,7 +758,7 @@ gpgsm_walk_cert_chain (ksba_cert_t start, ksba_cert_t *r_next) goto leave; } - rc = find_up (kh, start, issuer, 0); + rc = find_up (ctrl, kh, start, issuer, 0); if (rc) { /* It is quite common not to have a certificate, so better don't @@ -1194,7 +1278,7 @@ do_validate_chain (ctrl_t ctrl, ksba_cert_t cert, ksba_isotime_t checktime_arg, } if (!rootca_flags->relax) { - rc = allowed_ca (subject_cert, NULL, listmode, listfp); + rc = allowed_ca (ctrl, subject_cert, NULL, listmode, listfp); if (rc) goto leave; } @@ -1301,7 +1385,7 @@ do_validate_chain (ctrl_t ctrl, ksba_cert_t cert, ksba_isotime_t checktime_arg, /* Find the next cert up the tree. */ keydb_search_reset (kh); - rc = find_up (kh, subject_cert, issuer, 0); + rc = find_up (ctrl, kh, subject_cert, issuer, 0); if (rc) { if (rc == -1) @@ -1353,7 +1437,7 @@ do_validate_chain (ctrl_t ctrl, ksba_cert_t cert, ksba_isotime_t checktime_arg, root certificates. */ /* FIXME: Do this only if we don't have an AKI.keyIdentifier */ - rc = find_up (kh, subject_cert, issuer, 1); + rc = find_up (ctrl, kh, subject_cert, issuer, 1); if (!rc) { ksba_cert_t tmp_cert; @@ -1393,7 +1477,7 @@ do_validate_chain (ctrl_t ctrl, ksba_cert_t cert, ksba_isotime_t checktime_arg, { int chainlen; - rc = allowed_ca (issuer_cert, &chainlen, listmode, listfp); + rc = allowed_ca (ctrl, issuer_cert, &chainlen, listmode, listfp); if (rc) { /* Not allowed. Check whether this is a trusted root @@ -1656,7 +1740,7 @@ gpgsm_validate_chain (ctrl_t ctrl, ksba_cert_t cert, ksba_isotime_t checktime, the DB and that this one is valid; which it should be because it has been checked using this function. */ int -gpgsm_basic_cert_check (ksba_cert_t cert) +gpgsm_basic_cert_check (ctrl_t ctrl, ksba_cert_t cert) { int rc = 0; char *issuer = NULL; @@ -1706,7 +1790,7 @@ gpgsm_basic_cert_check (ksba_cert_t cert) { /* Find the next cert up the tree. */ keydb_search_reset (kh); - rc = find_up (kh, cert, issuer, 0); + rc = find_up (ctrl, kh, cert, issuer, 0); if (rc) { if (rc == -1) @@ -1771,7 +1855,7 @@ gpgsm_basic_cert_check (ksba_cert_t cert) receive the length of the chain which is either 0 or 1. */ static int -get_regtp_ca_info (ksba_cert_t cert, int *chainlen) +get_regtp_ca_info (ctrl_t ctrl, ksba_cert_t cert, int *chainlen) { gpg_error_t err; ksba_cert_t next; @@ -1816,7 +1900,7 @@ get_regtp_ca_info (ksba_cert_t cert, int *chainlen) ksba_cert_ref (cert); array[depth++] = cert; ksba_cert_ref (cert); - while (depth < DIM(array) && !(rc=gpgsm_walk_cert_chain (cert, &next))) + while (depth < DIM(array) && !(rc=gpgsm_walk_cert_chain (ctrl, cert, &next))) { ksba_cert_release (cert); ksba_cert_ref (next); |