1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * _ __ ___ ___ __| | ___ ___| | mod_ssl
19 * | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL
20 * | | | | | | (_) | (_| | \__ \__ \ |
21 * |_| |_| |_|\___/ \__,_|___|___/___/_|
24 * Variable Lookup Facility
26 /* ``Those of you who think they
27 know everything are very annoying
28 to those of us who do.''
30 #include "ssl_private.h"
36 /* _________________________________________________________________
39 ** _________________________________________________________________
42 static char *ssl_var_lookup_ssl(apr_pool_t *p, conn_rec *c, request_rec *r, char *var);
43 static char *ssl_var_lookup_ssl_cert(apr_pool_t *p, request_rec *r, X509 *xs, char *var);
44 static char *ssl_var_lookup_ssl_cert_dn(apr_pool_t *p, X509_NAME *xsname, char *var);
45 static char *ssl_var_lookup_ssl_cert_valid(apr_pool_t *p, ASN1_TIME *tm);
46 static char *ssl_var_lookup_ssl_cert_remain(apr_pool_t *p, ASN1_TIME *tm);
47 static char *ssl_var_lookup_ssl_cert_serial(apr_pool_t *p, X509 *xs);
48 static char *ssl_var_lookup_ssl_cert_chain(apr_pool_t *p, STACK_OF(X509) *sk, char *var);
49 static char *ssl_var_lookup_ssl_cert_PEM(apr_pool_t *p, X509 *xs);
50 static char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, conn_rec *c);
51 static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, conn_rec *c, char *var);
52 static void ssl_var_lookup_ssl_cipher_bits(SSL *ssl, int *usekeysize, int *algkeysize);
53 static char *ssl_var_lookup_ssl_version(apr_pool_t *p, char *var);
54 static char *ssl_var_lookup_ssl_compress_meth(SSL *ssl);
56 static int ssl_is_https(conn_rec *c)
58 SSLConnRec *sslconn = myConnConfig(c);
59 return sslconn && sslconn->ssl;
62 static const char var_interface[] = "mod_ssl/" AP_SERVER_BASEREVISION;
63 static char var_library_interface[] = SSL_LIBRARY_TEXT;
64 static char *var_library = NULL;
66 static apr_array_header_t *expr_peer_ext_list_fn(ap_expr_eval_ctx_t *ctx,
70 return ssl_ext_list(ctx->p, ctx->c, 1, arg);
73 static const char *expr_var_fn(ap_expr_eval_ctx_t *ctx, const void *data)
75 char *var = (char *)data;
76 return ssl_var_lookup_ssl(ctx->p, ctx->c, ctx->r, var);
79 static int ssl_expr_lookup(ap_expr_lookup_parms *parms)
81 switch (parms->type) {
82 case AP_EXPR_FUNC_VAR:
83 /* for now, we just handle everything that starts with SSL_, but
84 * register our hook as APR_HOOK_LAST
85 * XXX: This can be optimized
87 if (strcEQn(parms->name, "SSL_", 4)) {
88 *parms->func = expr_var_fn;
89 *parms->data = parms->name + 4;
93 case AP_EXPR_FUNC_LIST:
94 if (strcEQ(parms->name, "PeerExtList")) {
95 *parms->func = expr_peer_ext_list_fn;
96 *parms->data = "PeerExtList";
105 void ssl_var_register(apr_pool_t *p)
109 APR_REGISTER_OPTIONAL_FN(ssl_is_https);
110 APR_REGISTER_OPTIONAL_FN(ssl_var_lookup);
111 APR_REGISTER_OPTIONAL_FN(ssl_ext_list);
113 /* Perform once-per-process library version determination: */
114 var_library = apr_pstrdup(p, SSL_LIBRARY_DYNTEXT);
116 if ((cp = strchr(var_library, ' ')) != NULL) {
118 if ((cp2 = strchr(cp, ' ')) != NULL)
122 if ((cp = strchr(var_library_interface, ' ')) != NULL) {
124 if ((cp2 = strchr(cp, ' ')) != NULL)
128 ap_hook_expr_lookup(ssl_expr_lookup, NULL, NULL, APR_HOOK_MIDDLE);
131 /* This function must remain safe to use for a non-SSL connection. */
132 char *ssl_var_lookup(apr_pool_t *p, server_rec *s, conn_rec *c, request_rec *r, char *var)
134 SSLModConfigRec *mc = myModConfig(s);
143 * When no pool is given try to find one
155 * Request dependent stuff
161 if (strcEQ(var, "HTTP_USER_AGENT"))
162 result = apr_table_get(r->headers_in, "User-Agent");
163 else if (strcEQ(var, "HTTP_REFERER"))
164 result = apr_table_get(r->headers_in, "Referer");
165 else if (strcEQ(var, "HTTP_COOKIE"))
166 result = apr_table_get(r->headers_in, "Cookie");
167 else if (strcEQ(var, "HTTP_FORWARDED"))
168 result = apr_table_get(r->headers_in, "Forwarded");
169 else if (strcEQ(var, "HTTP_HOST"))
170 result = apr_table_get(r->headers_in, "Host");
171 else if (strcEQ(var, "HTTP_PROXY_CONNECTION"))
172 result = apr_table_get(r->headers_in, "Proxy-Connection");
173 else if (strcEQ(var, "HTTP_ACCEPT"))
174 result = apr_table_get(r->headers_in, "Accept");
175 else if (strlen(var) > 5 && strcEQn(var, "HTTP:", 5))
176 /* all other headers from which we are still not know about */
177 result = apr_table_get(r->headers_in, var+5);
182 if (strcEQ(var, "REQUEST_METHOD"))
184 else if (strcEQ(var, "REQUEST_SCHEME"))
185 result = ap_http_scheme(r);
186 else if (strcEQ(var, "REQUEST_URI"))
188 else if (strcEQ(var, "REQUEST_FILENAME"))
189 result = r->filename;
190 else if (strcEQ(var, "REMOTE_ADDR"))
191 result = r->useragent_ip;
192 else if (strcEQ(var, "REMOTE_HOST"))
193 result = ap_get_remote_host(r->connection, r->per_dir_config,
195 else if (strcEQ(var, "REMOTE_IDENT"))
196 result = ap_get_remote_logname(r);
197 else if (strcEQ(var, "REMOTE_USER"))
203 if (strcEQn(var, "SSL", 3)) break; /* shortcut common case */
205 if (strcEQ(var, "SERVER_ADMIN"))
206 result = r->server->server_admin;
207 else if (strcEQ(var, "SERVER_NAME"))
208 result = ap_get_server_name_for_url(r);
209 else if (strcEQ(var, "SERVER_PORT"))
210 result = apr_psprintf(p, "%u", ap_get_server_port(r));
211 else if (strcEQ(var, "SERVER_PROTOCOL"))
212 result = r->protocol;
213 else if (strcEQ(var, "SCRIPT_FILENAME"))
214 result = r->filename;
218 if (strcEQ(var, "PATH_INFO"))
219 result = r->path_info;
220 else if (strcEQ(var, "QUERY_STRING"))
222 else if (strcEQ(var, "IS_SUBREQ"))
223 result = (r->main != NULL ? "true" : "false");
224 else if (strcEQ(var, "DOCUMENT_ROOT"))
225 result = ap_document_root(r);
226 else if (strcEQ(var, "AUTH_TYPE"))
227 result = r->ap_auth_type;
228 else if (strcEQ(var, "THE_REQUEST"))
229 result = r->the_request;
230 else if (strlen(var) > 4 && strcEQn(var, "ENV:", 4)) {
231 result = apr_table_get(r->notes, var+4);
233 result = apr_table_get(r->subprocess_env, var+4);
242 if (result == NULL && c != NULL) {
243 SSLConnRec *sslconn = myConnConfig(c);
244 if (strlen(var) > 4 && strcEQn(var, "SSL_", 4)
245 && sslconn && sslconn->ssl)
246 result = ssl_var_lookup_ssl(p, c, r, var+4);
247 else if (strcEQ(var, "HTTPS")) {
248 if (sslconn && sslconn->ssl)
256 * Totally independent stuff
258 if (result == NULL) {
259 if (strlen(var) > 12 && strcEQn(var, "SSL_VERSION_", 12))
260 result = ssl_var_lookup_ssl_version(p, var+12);
261 else if (strcEQ(var, "SERVER_SOFTWARE"))
262 result = ap_get_server_banner();
263 else if (strcEQ(var, "API_VERSION")) {
264 result = apr_itoa(p, MODULE_MAGIC_NUMBER);
267 else if (strcEQ(var, "TIME_YEAR")) {
268 apr_time_exp_lt(&tm, apr_time_now());
269 result = apr_psprintf(p, "%02d%02d",
270 (tm.tm_year / 100) + 19, tm.tm_year % 100);
273 #define MKTIMESTR(format, tmfield) \
274 apr_time_exp_lt(&tm, apr_time_now()); \
275 result = apr_psprintf(p, format, tm.tmfield); \
277 else if (strcEQ(var, "TIME_MON")) {
278 MKTIMESTR("%02d", tm_mon+1)
280 else if (strcEQ(var, "TIME_DAY")) {
281 MKTIMESTR("%02d", tm_mday)
283 else if (strcEQ(var, "TIME_HOUR")) {
284 MKTIMESTR("%02d", tm_hour)
286 else if (strcEQ(var, "TIME_MIN")) {
287 MKTIMESTR("%02d", tm_min)
289 else if (strcEQ(var, "TIME_SEC")) {
290 MKTIMESTR("%02d", tm_sec)
292 else if (strcEQ(var, "TIME_WDAY")) {
293 MKTIMESTR("%d", tm_wday)
295 else if (strcEQ(var, "TIME")) {
296 apr_time_exp_lt(&tm, apr_time_now());
297 result = apr_psprintf(p,
298 "%02d%02d%02d%02d%02d%02d%02d", (tm.tm_year / 100) + 19,
299 (tm.tm_year % 100), tm.tm_mon+1, tm.tm_mday,
300 tm.tm_hour, tm.tm_min, tm.tm_sec);
303 /* all other env-variables from the parent Apache process */
304 else if (strlen(var) > 4 && strcEQn(var, "ENV:", 4)) {
305 result = getenv(var+4);
309 if (result != NULL && resdup)
310 result = apr_pstrdup(p, result);
313 return (char *)result;
316 static char *ssl_var_lookup_ssl(apr_pool_t *p, conn_rec *c, request_rec *r,
319 SSLConnRec *sslconn = myConnConfig(c);
328 if (strlen(var) > 8 && strcEQn(var, "VERSION_", 8)) {
329 result = ssl_var_lookup_ssl_version(p, var+8);
331 else if (ssl != NULL && strcEQ(var, "PROTOCOL")) {
332 result = (char *)SSL_get_version(ssl);
334 else if (ssl != NULL && strcEQ(var, "SESSION_ID")) {
335 char buf[SSL_SESSION_ID_STRING_LEN];
336 SSL_SESSION *pSession = SSL_get_session(ssl);
338 result = apr_pstrdup(p, SSL_SESSION_id2sz(
339 pSession->session_id,
340 pSession->session_id_length,
344 else if(ssl != NULL && strcEQ(var, "SESSION_RESUMED")) {
345 if (SSL_session_reused(ssl) == 1)
350 else if (ssl != NULL && strlen(var) >= 6 && strcEQn(var, "CIPHER", 6)) {
351 result = ssl_var_lookup_ssl_cipher(p, c, var+6);
353 else if (ssl != NULL && strlen(var) > 18 && strcEQn(var, "CLIENT_CERT_CHAIN_", 18)) {
354 sk = SSL_get_peer_cert_chain(ssl);
355 result = ssl_var_lookup_ssl_cert_chain(p, sk, var+18);
357 else if (ssl != NULL && strcEQ(var, "CLIENT_VERIFY")) {
358 result = ssl_var_lookup_ssl_cert_verify(p, c);
360 else if (ssl != NULL && strlen(var) > 7 && strcEQn(var, "CLIENT_", 7)) {
361 if ((xs = SSL_get_peer_certificate(ssl)) != NULL) {
362 result = ssl_var_lookup_ssl_cert(p, r, xs, var+7);
366 else if (ssl != NULL && strlen(var) > 7 && strcEQn(var, "SERVER_", 7)) {
367 if ((xs = SSL_get_certificate(ssl)) != NULL) {
368 result = ssl_var_lookup_ssl_cert(p, r, xs, var+7);
369 /* SSL_get_certificate is different from SSL_get_peer_certificate.
370 * No need to X509_free(xs).
374 else if (ssl != NULL && strcEQ(var, "COMPRESS_METHOD")) {
375 result = ssl_var_lookup_ssl_compress_meth(ssl);
377 #ifndef OPENSSL_NO_TLSEXT
378 else if (ssl != NULL && strcEQ(var, "TLS_SNI")) {
379 result = apr_pstrdup(p, SSL_get_servername(ssl,
380 TLSEXT_NAMETYPE_host_name));
383 else if (ssl != NULL && strcEQ(var, "SECURE_RENEG")) {
385 #ifdef SSL_get_secure_renegotiation_support
386 flag = SSL_get_secure_renegotiation_support(ssl);
388 result = apr_pstrdup(p, flag ? "true" : "false");
394 static char *ssl_var_lookup_ssl_cert_dn_oneline(apr_pool_t *p, request_rec *r,
399 int legacy_format = 0;
402 legacy_format = dc->nOptions & SSL_OPT_LEGACYDNFORMAT;
405 char *cp = X509_NAME_oneline(xsname, NULL, 0);
406 result = apr_pstrdup(p, cp);
412 unsigned long flags = XN_FLAG_RFC2253 & ~ASN1_STRFLGS_ESC_MSB;
413 if ((bio = BIO_new(BIO_s_mem())) == NULL)
415 X509_NAME_print_ex(bio, xsname, 0, flags);
416 n = BIO_pending(bio);
418 result = apr_palloc(p, n+1);
419 n = BIO_read(bio, result, n);
427 static char *ssl_var_lookup_ssl_cert(apr_pool_t *p, request_rec *r, X509 *xs,
438 if (strcEQ(var, "M_VERSION")) {
439 result = apr_psprintf(p, "%lu", X509_get_version(xs)+1);
442 else if (strcEQ(var, "M_SERIAL")) {
443 result = ssl_var_lookup_ssl_cert_serial(p, xs);
445 else if (strcEQ(var, "V_START")) {
446 result = ssl_var_lookup_ssl_cert_valid(p, X509_get_notBefore(xs));
448 else if (strcEQ(var, "V_END")) {
449 result = ssl_var_lookup_ssl_cert_valid(p, X509_get_notAfter(xs));
451 else if (strcEQ(var, "V_REMAIN")) {
452 result = ssl_var_lookup_ssl_cert_remain(p, X509_get_notAfter(xs));
455 else if (*var && strcEQ(var+1, "_DN")) {
457 xsname = X509_get_subject_name(xs);
458 else if (*var == 'I')
459 xsname = X509_get_issuer_name(xs);
462 result = ssl_var_lookup_ssl_cert_dn_oneline(p, r, xsname);
465 else if (strlen(var) > 5 && strcEQn(var+1, "_DN_", 4)) {
467 xsname = X509_get_subject_name(xs);
468 else if (*var == 'I')
469 xsname = X509_get_issuer_name(xs);
472 result = ssl_var_lookup_ssl_cert_dn(p, xsname, var+5);
475 else if (strcEQ(var, "A_SIG")) {
476 nid = OBJ_obj2nid((ASN1_OBJECT *)(xs->cert_info->signature->algorithm));
477 result = apr_pstrdup(p,
478 (nid == NID_undef) ? "UNKNOWN" : OBJ_nid2ln(nid));
481 else if (strcEQ(var, "A_KEY")) {
482 nid = OBJ_obj2nid((ASN1_OBJECT *)(xs->cert_info->key->algor->algorithm));
483 result = apr_pstrdup(p,
484 (nid == NID_undef) ? "UNKNOWN" : OBJ_nid2ln(nid));
487 else if (strcEQ(var, "CERT")) {
488 result = ssl_var_lookup_ssl_cert_PEM(p, xs);
491 if (result != NULL && resdup)
492 result = apr_pstrdup(p, result);
496 /* In this table, .extract is non-zero if RDNs using the NID should be
497 * extracted to for the SSL_{CLIENT,SERVER}_{I,S}_DN_* environment
499 static const struct {
503 } ssl_var_lookup_ssl_cert_dn_rec[] = {
504 { "C", NID_countryName, 1 },
505 { "ST", NID_stateOrProvinceName, 1 }, /* officially (RFC2156) */
506 { "SP", NID_stateOrProvinceName, 0 }, /* compatibility (SSLeay) */
507 { "L", NID_localityName, 1 },
508 { "O", NID_organizationName, 1 },
509 { "OU", NID_organizationalUnitName, 1 },
510 { "CN", NID_commonName, 1 },
511 { "T", NID_title, 1 },
512 { "I", NID_initials, 1 },
513 { "G", NID_givenName, 1 },
514 { "S", NID_surname, 1 },
515 { "D", NID_description, 1 },
517 { "UID", NID_userId, 1 },
519 { "Email", NID_pkcs9_emailAddress, 1 },
523 static char *ssl_var_lookup_ssl_cert_dn(apr_pool_t *p, X509_NAME *xsname, char *var)
526 X509_NAME_ENTRY *xsne;
527 int i, j, n, idx = 0;
530 /* if an _N suffix is used, find the Nth attribute of given name */
531 ptr = strchr(var, '_');
532 if (ptr != NULL && strspn(ptr + 1, "0123456789") == strlen(ptr + 1)) {
536 varlen = strlen(var);
541 for (i = 0; ssl_var_lookup_ssl_cert_dn_rec[i].name != NULL; i++) {
542 if (strEQn(var, ssl_var_lookup_ssl_cert_dn_rec[i].name, varlen)
543 && strlen(ssl_var_lookup_ssl_cert_dn_rec[i].name) == varlen) {
544 for (j = 0; j < sk_X509_NAME_ENTRY_num((STACK_OF(X509_NAME_ENTRY) *)
547 xsne = sk_X509_NAME_ENTRY_value((STACK_OF(X509_NAME_ENTRY) *)
550 n =OBJ_obj2nid((ASN1_OBJECT *)X509_NAME_ENTRY_get_object(xsne));
552 if (n == ssl_var_lookup_ssl_cert_dn_rec[i].nid && idx-- == 0) {
553 result = SSL_X509_NAME_ENTRY_to_string(p, xsne);
563 static char *ssl_var_lookup_ssl_cert_valid(apr_pool_t *p, ASN1_TIME *tm)
569 if ((bio = BIO_new(BIO_s_mem())) == NULL)
571 ASN1_TIME_print(bio, tm);
572 n = BIO_pending(bio);
573 result = apr_pcalloc(p, n+1);
574 n = BIO_read(bio, result, n);
580 #define DIGIT2NUM(x) (((x)[0] - '0') * 10 + (x)[1] - '0')
582 /* Return a string giving the number of days remaining until 'tm', or
583 * "0" if this can't be determined. */
584 static char *ssl_var_lookup_ssl_cert_remain(apr_pool_t *p, ASN1_TIME *tm)
586 apr_time_t then, now = apr_time_now();
587 apr_time_exp_t exp = {0};
591 /* Fail if the time isn't a valid ASN.1 TIME; RFC3280 mandates
592 * that the seconds digits are present even though ASN.1
594 if ((tm->type == V_ASN1_UTCTIME && tm->length < 11) ||
595 (tm->type == V_ASN1_GENERALIZEDTIME && tm->length < 13) ||
596 !ASN1_TIME_check(tm)) {
597 return apr_pstrdup(p, "0");
600 if (tm->type == V_ASN1_UTCTIME) {
601 exp.tm_year = DIGIT2NUM(tm->data);
602 if (exp.tm_year <= 50) exp.tm_year += 100;
605 exp.tm_year = DIGIT2NUM(tm->data) * 100 + DIGIT2NUM(tm->data + 2) - 1900;
609 exp.tm_mon = DIGIT2NUM(dp) - 1;
610 exp.tm_mday = DIGIT2NUM(dp + 2) + 1;
611 exp.tm_hour = DIGIT2NUM(dp + 4);
612 exp.tm_min = DIGIT2NUM(dp + 6);
613 exp.tm_sec = DIGIT2NUM(dp + 8);
615 if (apr_time_exp_gmt_get(&then, &exp) != APR_SUCCESS) {
616 return apr_pstrdup(p, "0");
619 diff = (long)((apr_time_sec(then) - apr_time_sec(now)) / (60*60*24));
621 return diff > 0 ? apr_ltoa(p, diff) : apr_pstrdup(p, "0");
624 static char *ssl_var_lookup_ssl_cert_serial(apr_pool_t *p, X509 *xs)
630 if ((bio = BIO_new(BIO_s_mem())) == NULL)
632 i2a_ASN1_INTEGER(bio, X509_get_serialNumber(xs));
633 n = BIO_pending(bio);
634 result = apr_pcalloc(p, n+1);
635 n = BIO_read(bio, result, n);
641 static char *ssl_var_lookup_ssl_cert_chain(apr_pool_t *p, STACK_OF(X509) *sk, char *var)
649 if (strspn(var, "0123456789") == strlen(var)) {
651 if (n < sk_X509_num(sk)) {
652 xs = sk_X509_value(sk, n);
653 result = ssl_var_lookup_ssl_cert_PEM(p, xs);
660 static char *ssl_var_lookup_ssl_cert_PEM(apr_pool_t *p, X509 *xs)
666 if ((bio = BIO_new(BIO_s_mem())) == NULL)
668 PEM_write_bio_X509(bio, xs);
669 n = BIO_pending(bio);
670 result = apr_pcalloc(p, n+1);
671 n = BIO_read(bio, result, n);
677 static char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, conn_rec *c)
679 SSLConnRec *sslconn = myConnConfig(c);
689 verr = sslconn->verify_error;
690 vinfo = sslconn->verify_info;
691 vrc = SSL_get_verify_result(ssl);
692 xs = SSL_get_peer_certificate(ssl);
694 if (vrc == X509_V_OK && verr == NULL && xs == NULL)
695 /* no client verification done at all */
697 else if (vrc == X509_V_OK && verr == NULL && vinfo == NULL && xs != NULL)
698 /* client verification done successful */
700 else if (vrc == X509_V_OK && vinfo != NULL && strEQ(vinfo, "GENEROUS"))
701 /* client verification done in generous way */
704 /* client verification failed */
705 result = apr_psprintf(p, "FAILED:%s",
706 verr ? verr : X509_verify_cert_error_string(vrc));
713 static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, conn_rec *c, char *var)
715 SSLConnRec *sslconn = myConnConfig(c);
718 int usekeysize, algkeysize;
725 ssl_var_lookup_ssl_cipher_bits(ssl, &usekeysize, &algkeysize);
727 if (ssl && strEQ(var, "")) {
728 MODSSL_SSL_CIPHER_CONST SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
729 result = (cipher != NULL ? (char *)SSL_CIPHER_get_name(cipher) : NULL);
731 else if (strcEQ(var, "_EXPORT"))
732 result = (usekeysize < 56 ? "true" : "false");
733 else if (strcEQ(var, "_USEKEYSIZE")) {
734 result = apr_itoa(p, usekeysize);
737 else if (strcEQ(var, "_ALGKEYSIZE")) {
738 result = apr_itoa(p, algkeysize);
742 if (result != NULL && resdup)
743 result = apr_pstrdup(p, result);
747 static void ssl_var_lookup_ssl_cipher_bits(SSL *ssl, int *usekeysize, int *algkeysize)
749 MODSSL_SSL_CIPHER_CONST SSL_CIPHER *cipher;
754 if ((cipher = SSL_get_current_cipher(ssl)) != NULL)
755 *usekeysize = SSL_CIPHER_get_bits(cipher, algkeysize);
759 static char *ssl_var_lookup_ssl_version(apr_pool_t *p, char *var)
761 if (strEQ(var, "INTERFACE")) {
762 return apr_pstrdup(p, var_interface);
764 else if (strEQ(var, "LIBRARY_INTERFACE")) {
765 return apr_pstrdup(p, var_library_interface);
767 else if (strEQ(var, "LIBRARY")) {
768 return apr_pstrdup(p, var_library);
773 /* Add each RDN in 'xn' to the table 't' where the NID is present in
774 * 'nids', using key prefix 'pfx'. */
775 static void extract_dn(apr_table_t *t, apr_hash_t *nids, const char *pfx,
776 X509_NAME *xn, apr_pool_t *p)
778 STACK_OF(X509_NAME_ENTRY) *ents = xn->entries;
779 X509_NAME_ENTRY *xsne;
783 /* Hash of (int) NID -> (int *) counter to count each time an RDN
784 * with the given NID has been seen. */
785 count = apr_hash_make(p);
787 /* For each RDN... */
788 for (i = 0; i < sk_X509_NAME_ENTRY_num(ents); i++) {
791 xsne = sk_X509_NAME_ENTRY_value(ents, i);
793 /* Retrieve the nid, and check whether this is one of the nids
794 * which are to be extracted. */
795 nid = OBJ_obj2nid((ASN1_OBJECT *)X509_NAME_ENTRY_get_object(xsne));
797 tag = apr_hash_get(nids, &nid, sizeof nid);
803 /* Check whether a variable with this nid was already
804 * been used; if so, use the foo_N=bar syntax. */
805 dup = apr_hash_get(count, &nid, sizeof nid);
807 key = apr_psprintf(p, "%s%s_%d", pfx, tag, ++(*dup));
810 /* Otherwise, use the plain foo=bar syntax. */
811 dup = apr_pcalloc(p, sizeof *dup);
812 apr_hash_set(count, &nid, sizeof nid, dup);
813 key = apr_pstrcat(p, pfx, tag, NULL);
815 value = SSL_X509_NAME_ENTRY_to_string(p, xsne);
816 apr_table_setn(t, key, value);
821 void modssl_var_extract_dns(apr_table_t *t, SSL *ssl, apr_pool_t *p)
827 /* Build up a hash table of (int *)NID->(char *)short-name for all
828 * the tags which are to be extracted: */
829 nids = apr_hash_make(p);
830 for (n = 0; ssl_var_lookup_ssl_cert_dn_rec[n].name; n++) {
831 if (ssl_var_lookup_ssl_cert_dn_rec[n].extract) {
832 apr_hash_set(nids, &ssl_var_lookup_ssl_cert_dn_rec[n].nid,
833 sizeof(ssl_var_lookup_ssl_cert_dn_rec[0].nid),
834 ssl_var_lookup_ssl_cert_dn_rec[n].name);
838 /* Extract the server cert DNS -- note that the refcount does NOT
840 xs = SSL_get_certificate(ssl);
842 extract_dn(t, nids, "SSL_SERVER_S_DN_", X509_get_subject_name(xs), p);
843 extract_dn(t, nids, "SSL_SERVER_I_DN_", X509_get_issuer_name(xs), p);
846 /* Extract the client cert DNs -- note that the refcount DOES
848 xs = SSL_get_peer_certificate(ssl);
850 extract_dn(t, nids, "SSL_CLIENT_S_DN_", X509_get_subject_name(xs), p);
851 extract_dn(t, nids, "SSL_CLIENT_I_DN_", X509_get_issuer_name(xs), p);
856 /* For an extension type which OpenSSL does not recognize, attempt to
857 * parse the extension type as a primitive string. This will fail for
858 * any structured extension type per the docs. Returns non-zero on
859 * success and writes the string to the given bio. */
860 static int dump_extn_value(BIO *bio, ASN1_OCTET_STRING *str)
862 MODSSL_D2I_ASN1_type_bytes_CONST unsigned char *pp = str->data;
863 ASN1_STRING *ret = ASN1_STRING_new();
866 /* This allows UTF8String, IA5String, VisibleString, or BMPString;
867 * conversion to UTF-8 is forced. */
868 if (d2i_DISPLAYTEXT(&ret, &pp, str->length)) {
869 ASN1_STRING_print_ex(bio, ret, ASN1_STRFLGS_UTF8_CONVERT);
873 ASN1_STRING_free(ret);
877 apr_array_header_t *ssl_ext_list(apr_pool_t *p, conn_rec *c, int peer,
878 const char *extension)
880 SSLConnRec *sslconn = myConnConfig(c);
882 apr_array_header_t *array = NULL;
884 ASN1_OBJECT *oid = NULL;
887 if (!sslconn || !sslconn->ssl || !extension) {
892 /* We accept the "extension" string to be converted as
893 * a long name (nsComment), short name (DN) or
894 * numeric OID (1.2.3.4).
896 oid = OBJ_txt2obj(extension, 0);
898 ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01970)
899 "could not parse OID '%s'", extension);
904 xs = peer ? SSL_get_peer_certificate(ssl) : SSL_get_certificate(ssl);
909 count = X509_get_ext_count(xs);
910 /* Create an array large enough to accomodate every extension. This is
911 * likely overkill, but safe.
913 array = apr_array_make(p, count, sizeof(char *));
914 for (j = 0; j < count; j++) {
915 X509_EXTENSION *ext = X509_get_ext(xs, j);
917 if (OBJ_cmp(ext->object, oid) == 0) {
918 BIO *bio = BIO_new(BIO_s_mem());
920 /* We want to obtain a string representation of the extensions
921 * value and add it to the array we're building.
922 * X509V3_EXT_print() doesn't know about all the possible
923 * data types, but the value is stored as an ASN1_OCTET_STRING
924 * allowing us a fallback in case of X509V3_EXT_print
925 * not knowing how to handle the data.
927 if (X509V3_EXT_print(bio, ext, 0, 0) == 1 ||
928 dump_extn_value(bio, X509_EXTENSION_get_data(ext)) == 1) {
930 char **ptr = apr_array_push(array);
931 BIO_get_mem_ptr(bio, &buf);
932 *ptr = apr_pstrmemdup(p, buf->data, buf->length);
934 ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01971)
935 "Found an extension '%s', but failed to "
936 "create a string from it", extension);
942 if (array->nelts == 0)
946 /* only SSL_get_peer_certificate raises the refcount */
950 ASN1_OBJECT_free(oid);
955 static char *ssl_var_lookup_ssl_compress_meth(SSL *ssl)
957 char *result = "NULL";
958 #if (OPENSSL_VERSION_NUMBER >= 0x00908000)
959 SSL_SESSION *pSession = SSL_get_session(ssl);
962 switch (pSession->compress_meth) {
964 /* default "NULL" already set */
967 /* Defined by RFC 3749, deflate is coded by "1" */
972 /* IANA assigned compression number for LZS */
986 /* _________________________________________________________________
988 ** SSL Extension to mod_log_config
989 ** _________________________________________________________________
992 #include "../../modules/loggers/mod_log_config.h"
994 static const char *ssl_var_log_handler_c(request_rec *r, char *a);
995 static const char *ssl_var_log_handler_x(request_rec *r, char *a);
998 * register us for the mod_log_config function registering phase
999 * to establish %{...}c and to be able to expand %{...}x variables.
1001 void ssl_var_log_config_register(apr_pool_t *p)
1003 static APR_OPTIONAL_FN_TYPE(ap_register_log_handler) *log_pfn_register;
1005 log_pfn_register = APR_RETRIEVE_OPTIONAL_FN(ap_register_log_handler);
1007 if (log_pfn_register) {
1008 log_pfn_register(p, "c", ssl_var_log_handler_c, 0);
1009 log_pfn_register(p, "x", ssl_var_log_handler_x, 0);
1015 * implement the %{..}c log function
1016 * (we are the only function)
1018 static const char *ssl_var_log_handler_c(request_rec *r, char *a)
1020 SSLConnRec *sslconn = myConnConfig(r->connection);
1023 if (sslconn == NULL || sslconn->ssl == NULL)
1026 if (strEQ(a, "version"))
1027 result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_PROTOCOL");
1028 else if (strEQ(a, "cipher"))
1029 result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_CIPHER");
1030 else if (strEQ(a, "subjectdn") || strEQ(a, "clientcert"))
1031 result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_CLIENT_S_DN");
1032 else if (strEQ(a, "issuerdn") || strEQ(a, "cacert"))
1033 result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_CLIENT_I_DN");
1034 else if (strEQ(a, "errcode"))
1036 else if (strEQ(a, "errstr"))
1037 result = (char *)sslconn->verify_error;
1038 if (result != NULL && result[0] == NUL)
1044 * extend the implementation of the %{..}x log function
1045 * (there can be more functions)
1047 static const char *ssl_var_log_handler_x(request_rec *r, char *a)
1051 result = ssl_var_lookup(r->pool, r->server, r->connection, r, a);
1052 if (result != NULL && result[0] == NUL)