Commit | Line | Data |
---|---|---|
aaba7d03 VD |
1 | /* |
2 | * Author: Viktor Dukhovni | |
3 | * License: THIS CODE IS IN THE PUBLIC DOMAIN. | |
80fea873 JH |
4 | * |
5 | * Copyright (c) The Exim Maintainers 2014 - 2016 | |
aaba7d03 | 6 | */ |
e682570f TL |
7 | #include <stdio.h> |
8 | #include <string.h> | |
9 | #include <stdint.h> | |
10 | ||
11 | #include <openssl/opensslv.h> | |
12 | #include <openssl/err.h> | |
13 | #include <openssl/crypto.h> | |
14 | #include <openssl/safestack.h> | |
15 | #include <openssl/objects.h> | |
16 | #include <openssl/x509.h> | |
17 | #include <openssl/x509v3.h> | |
18 | #include <openssl/evp.h> | |
aaba7d03 | 19 | #include <openssl/bn.h> |
e682570f TL |
20 | |
21 | #if OPENSSL_VERSION_NUMBER < 0x1000000fL | |
880a1e77 | 22 | # error "OpenSSL 1.0.0 or higher required" |
3376de6c | 23 | #endif |
e682570f | 24 | |
ae98657d JH |
25 | #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER) |
26 | # define X509_up_ref(x) CRYPTO_add(&((x)->references), 1, CRYPTO_LOCK_X509) | |
aaba7d03 | 27 | #endif |
c8dfb21d JH |
28 | #if OPENSSL_VERSION_NUMBER >= 0x10100000L |
29 | # define EXIM_HAVE_ASN1_MACROS | |
30 | # define EXIM_OPAQUE_X509 | |
e3555426 JH |
31 | #else |
32 | # define X509_STORE_CTX_get_verify(ctx) (ctx)->verify | |
33 | # define X509_STORE_CTX_get_verify_cb(ctx) (ctx)->verify_cb | |
34 | # define X509_STORE_CTX_get0_cert(ctx) (ctx)->cert | |
35 | # define X509_STORE_CTX_get0_chain(ctx) (ctx)->chain | |
36 | # define X509_STORE_CTX_get0_untrusted(ctx) (ctx)->untrusted | |
37 | ||
38 | # define X509_STORE_CTX_set_verify(ctx, verify_chain) (ctx)->verify = (verify_chain) | |
39 | # define X509_STORE_CTX_set0_verified_chain(ctx, sk) (ctx)->chain = (sk) | |
40 | # define X509_STORE_CTX_set_error_depth(ctx, val) (ctx)->error_depth = (val) | |
41 | # define X509_STORE_CTX_set_current_cert(ctx, cert) (ctx)->current_cert = (cert) | |
3376de6c JH |
42 | |
43 | # define ASN1_STRING_get0_data ASN1_STRING_data | |
44 | # define X509_getm_notBefore X509_get_notBefore | |
45 | # define X509_getm_notAfter X509_get_notAfter | |
46 | ||
47 | # define CRYPTO_ONCE_STATIC_INIT 0 | |
48 | # define CRYPTO_THREAD_run_once run_once | |
49 | typedef int CRYPTO_ONCE; | |
c8dfb21d JH |
50 | #endif |
51 | ||
aaba7d03 | 52 | |
e682570f TL |
53 | #include "danessl.h" |
54 | ||
aaba7d03 VD |
55 | #define DANESSL_F_ADD_SKID 100 |
56 | #define DANESSL_F_ADD_TLSA 101 | |
57 | #define DANESSL_F_CHECK_END_ENTITY 102 | |
58 | #define DANESSL_F_CTX_INIT 103 | |
59 | #define DANESSL_F_GROW_CHAIN 104 | |
60 | #define DANESSL_F_INIT 105 | |
61 | #define DANESSL_F_LIBRARY_INIT 106 | |
62 | #define DANESSL_F_LIST_ALLOC 107 | |
63 | #define DANESSL_F_MATCH 108 | |
64 | #define DANESSL_F_PUSH_EXT 109 | |
65 | #define DANESSL_F_SET_TRUST_ANCHOR 110 | |
66 | #define DANESSL_F_VERIFY_CERT 111 | |
67 | #define DANESSL_F_WRAP_CERT 112 | |
3376de6c | 68 | #define DANESSL_F_DANESSL_VERIFY_CHAIN 113 |
aaba7d03 VD |
69 | |
70 | #define DANESSL_R_BAD_CERT 100 | |
71 | #define DANESSL_R_BAD_CERT_PKEY 101 | |
72 | #define DANESSL_R_BAD_DATA_LENGTH 102 | |
73 | #define DANESSL_R_BAD_DIGEST 103 | |
74 | #define DANESSL_R_BAD_NULL_DATA 104 | |
75 | #define DANESSL_R_BAD_PKEY 105 | |
76 | #define DANESSL_R_BAD_SELECTOR 106 | |
77 | #define DANESSL_R_BAD_USAGE 107 | |
78 | #define DANESSL_R_INIT 108 | |
79 | #define DANESSL_R_LIBRARY_INIT 109 | |
80 | #define DANESSL_R_NOSIGN_KEY 110 | |
81 | #define DANESSL_R_SCTX_INIT 111 | |
82 | #define DANESSL_R_SUPPORT 112 | |
e682570f TL |
83 | |
84 | #ifndef OPENSSL_NO_ERR | |
aaba7d03 VD |
85 | #define DANESSL_F_PLACEHOLDER 0 /* FIRST! Value TBD */ |
86 | static ERR_STRING_DATA dane_str_functs[] = { | |
87 | {DANESSL_F_PLACEHOLDER, "DANE library"}, /* FIRST!!! */ | |
88 | {DANESSL_F_ADD_SKID, "add_skid"}, | |
89 | {DANESSL_F_ADD_TLSA, "DANESSL_add_tlsa"}, | |
90 | {DANESSL_F_CHECK_END_ENTITY, "check_end_entity"}, | |
91 | {DANESSL_F_CTX_INIT, "DANESSL_CTX_init"}, | |
92 | {DANESSL_F_GROW_CHAIN, "grow_chain"}, | |
93 | {DANESSL_F_INIT, "DANESSL_init"}, | |
94 | {DANESSL_F_LIBRARY_INIT, "DANESSL_library_init"}, | |
95 | {DANESSL_F_LIST_ALLOC, "list_alloc"}, | |
96 | {DANESSL_F_MATCH, "match"}, | |
97 | {DANESSL_F_PUSH_EXT, "push_ext"}, | |
98 | {DANESSL_F_SET_TRUST_ANCHOR, "set_trust_anchor"}, | |
99 | {DANESSL_F_VERIFY_CERT, "verify_cert"}, | |
100 | {DANESSL_F_WRAP_CERT, "wrap_cert"}, | |
101 | {0, NULL} | |
e682570f | 102 | }; |
aaba7d03 VD |
103 | static ERR_STRING_DATA dane_str_reasons[] = { |
104 | {DANESSL_R_BAD_CERT, "Bad TLSA record certificate"}, | |
105 | {DANESSL_R_BAD_CERT_PKEY, "Bad TLSA record certificate public key"}, | |
106 | {DANESSL_R_BAD_DATA_LENGTH, "Bad TLSA record digest length"}, | |
107 | {DANESSL_R_BAD_DIGEST, "Bad TLSA record digest"}, | |
108 | {DANESSL_R_BAD_NULL_DATA, "Bad TLSA record null data"}, | |
109 | {DANESSL_R_BAD_PKEY, "Bad TLSA record public key"}, | |
110 | {DANESSL_R_BAD_SELECTOR, "Bad TLSA record selector"}, | |
111 | {DANESSL_R_BAD_USAGE, "Bad TLSA record usage"}, | |
112 | {DANESSL_R_INIT, "DANESSL_init() required"}, | |
113 | {DANESSL_R_LIBRARY_INIT, "DANESSL_library_init() required"}, | |
114 | {DANESSL_R_NOSIGN_KEY, "Certificate usage 2 requires EC support"}, | |
115 | {DANESSL_R_SCTX_INIT, "DANESSL_CTX_init() required"}, | |
116 | {DANESSL_R_SUPPORT, "DANE library features not supported"}, | |
117 | {0, NULL} | |
e682570f | 118 | }; |
aaba7d03 | 119 | #endif |
e682570f TL |
120 | |
121 | #define DANEerr(f, r) ERR_PUT_error(err_lib_dane, (f), (r), __FILE__, __LINE__) | |
122 | ||
123 | static int err_lib_dane = -1; | |
124 | static int dane_idx = -1; | |
125 | ||
126 | #ifdef X509_V_FLAG_PARTIAL_CHAIN /* OpenSSL >= 1.0.2 */ | |
127 | static int wrap_to_root = 0; | |
128 | #else | |
129 | static int wrap_to_root = 1; | |
130 | #endif | |
131 | ||
132 | static void (*cert_free)(void *) = (void (*)(void *)) X509_free; | |
133 | static void (*pkey_free)(void *) = (void (*)(void *)) EVP_PKEY_free; | |
134 | ||
880a1e77 JH |
135 | typedef struct dane_list |
136 | { | |
e682570f TL |
137 | struct dane_list *next; |
138 | void *value; | |
139 | } *dane_list; | |
140 | ||
141 | #define LINSERT(h, e) do { (e)->next = (h); (h) = (e); } while (0) | |
142 | ||
880a1e77 JH |
143 | typedef struct dane_host_list |
144 | { | |
145 | struct dane_host_list *next; | |
e682570f | 146 | char *value; |
880a1e77 | 147 | } *dane_host_list; |
e682570f | 148 | |
880a1e77 JH |
149 | typedef struct dane_data |
150 | { | |
e682570f TL |
151 | size_t datalen; |
152 | unsigned char data[0]; | |
153 | } *dane_data; | |
154 | ||
880a1e77 JH |
155 | typedef struct dane_data_list |
156 | { | |
157 | struct dane_data_list *next; | |
e682570f | 158 | dane_data value; |
880a1e77 | 159 | } *dane_data_list; |
e682570f | 160 | |
880a1e77 JH |
161 | typedef struct dane_mtype |
162 | { | |
e682570f TL |
163 | int mdlen; |
164 | const EVP_MD *md; | |
880a1e77 | 165 | dane_data_list data; |
e682570f TL |
166 | } *dane_mtype; |
167 | ||
880a1e77 JH |
168 | typedef struct dane_mtype_list |
169 | { | |
170 | struct dane_mtype_list *next; | |
e682570f | 171 | dane_mtype value; |
880a1e77 | 172 | } *dane_mtype_list; |
e682570f | 173 | |
880a1e77 JH |
174 | typedef struct dane_selector |
175 | { | |
e682570f | 176 | uint8_t selector; |
880a1e77 | 177 | dane_mtype_list mtype; |
e682570f TL |
178 | } *dane_selector; |
179 | ||
880a1e77 JH |
180 | typedef struct dane_selector_list |
181 | { | |
182 | struct dane_selector_list *next; | |
e682570f | 183 | dane_selector value; |
880a1e77 | 184 | } *dane_selector_list; |
e682570f | 185 | |
880a1e77 JH |
186 | typedef struct dane_pkey_list |
187 | { | |
188 | struct dane_pkey_list *next; | |
e682570f | 189 | EVP_PKEY *value; |
880a1e77 | 190 | } *dane_pkey_list; |
e682570f | 191 | |
880a1e77 JH |
192 | typedef struct dane_cert_list |
193 | { | |
194 | struct dane_cert_list *next; | |
e682570f | 195 | X509 *value; |
880a1e77 | 196 | } *dane_cert_list; |
e682570f | 197 | |
880a1e77 JH |
198 | typedef struct ssl_dane |
199 | { | |
e682570f TL |
200 | int (*verify)(X509_STORE_CTX *); |
201 | STACK_OF(X509) *roots; | |
202 | STACK_OF(X509) *chain; | |
aaba7d03 VD |
203 | X509 *match; /* Matched cert */ |
204 | const char *thost; /* TLSA base domain */ | |
205 | char *mhost; /* Matched peer name */ | |
880a1e77 JH |
206 | dane_pkey_list pkeys; |
207 | dane_cert_list certs; | |
208 | dane_host_list hosts; | |
aaba7d03 | 209 | dane_selector_list selectors[DANESSL_USAGE_LAST + 1]; |
e682570f | 210 | int depth; |
aaba7d03 VD |
211 | int mdpth; /* Depth of matched cert */ |
212 | int multi; /* Multi-label wildcards? */ | |
213 | int count; /* Number of TLSA records */ | |
880a1e77 | 214 | } ssl_dane; |
e682570f TL |
215 | |
216 | #ifndef X509_V_ERR_HOSTNAME_MISMATCH | |
880a1e77 | 217 | # define X509_V_ERR_HOSTNAME_MISMATCH X509_V_ERR_APPLICATION_VERIFICATION |
e682570f TL |
218 | #endif |
219 | ||
f2f2c91b JH |
220 | |
221 | ||
880a1e77 JH |
222 | static int |
223 | match(dane_selector_list slist, X509 *cert, int depth) | |
e682570f | 224 | { |
880a1e77 | 225 | int matched; |
e682570f | 226 | |
880a1e77 JH |
227 | /* |
228 | * Note, set_trust_anchor() needs to know whether the match was for a | |
229 | * pkey digest or a certificate digest. We return MATCHED_PKEY or | |
230 | * MATCHED_CERT accordingly. | |
231 | */ | |
aaba7d03 VD |
232 | #define MATCHED_CERT (DANESSL_SELECTOR_CERT + 1) |
233 | #define MATCHED_PKEY (DANESSL_SELECTOR_SPKI + 1) | |
e682570f | 234 | |
880a1e77 JH |
235 | /* |
236 | * Loop over each selector, mtype, and associated data element looking | |
237 | * for a match. | |
238 | */ | |
aaba7d03 | 239 | for (matched = 0; !matched && slist; slist = slist->next) |
880a1e77 JH |
240 | { |
241 | dane_mtype_list m; | |
242 | unsigned char mdbuf[EVP_MAX_MD_SIZE]; | |
85098ee7 | 243 | unsigned char *buf = NULL; |
880a1e77 | 244 | unsigned char *buf2; |
85098ee7 | 245 | unsigned int len = 0; |
880a1e77 JH |
246 | |
247 | /* | |
248 | * Extract ASN.1 DER form of certificate or public key. | |
249 | */ | |
250 | switch(slist->value->selector) | |
251 | { | |
aaba7d03 | 252 | case DANESSL_SELECTOR_CERT: |
880a1e77 JH |
253 | len = i2d_X509(cert, NULL); |
254 | buf2 = buf = (unsigned char *) OPENSSL_malloc(len); | |
255 | if(buf) i2d_X509(cert, &buf2); | |
256 | break; | |
aaba7d03 | 257 | case DANESSL_SELECTOR_SPKI: |
880a1e77 JH |
258 | len = i2d_X509_PUBKEY(X509_get_X509_PUBKEY(cert), NULL); |
259 | buf2 = buf = (unsigned char *) OPENSSL_malloc(len); | |
260 | if(buf) i2d_X509_PUBKEY(X509_get_X509_PUBKEY(cert), &buf2); | |
261 | break; | |
262 | } | |
263 | ||
aaba7d03 | 264 | if (!buf) |
880a1e77 | 265 | { |
aaba7d03 | 266 | DANEerr(DANESSL_F_MATCH, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
267 | return 0; |
268 | } | |
269 | OPENSSL_assert(buf2 - buf == len); | |
270 | ||
271 | /* | |
272 | * Loop over each mtype and data element | |
273 | */ | |
aaba7d03 | 274 | for (m = slist->value->mtype; !matched && m; m = m->next) |
880a1e77 JH |
275 | { |
276 | dane_data_list d; | |
277 | unsigned char *cmpbuf = buf; | |
278 | unsigned int cmplen = len; | |
279 | ||
e682570f | 280 | /* |
880a1e77 JH |
281 | * If it is a digest, compute the corresponding digest of the |
282 | * DER data for comparison, otherwise, use the full object. | |
e682570f | 283 | */ |
aaba7d03 | 284 | if (m->value->md) |
880a1e77 JH |
285 | { |
286 | cmpbuf = mdbuf; | |
aaba7d03 | 287 | if (!EVP_Digest(buf, len, cmpbuf, &cmplen, m->value->md, 0)) |
880a1e77 JH |
288 | matched = -1; |
289 | } | |
aaba7d03 VD |
290 | for (d = m->value->data; !matched && d; d = d->next) |
291 | if ( cmplen == d->value->datalen | |
292 | && memcmp(cmpbuf, d->value->data, cmplen) == 0) | |
880a1e77 | 293 | matched = slist->value->selector + 1; |
e682570f TL |
294 | } |
295 | ||
880a1e77 JH |
296 | OPENSSL_free(buf); |
297 | } | |
e682570f | 298 | |
880a1e77 | 299 | return matched; |
e682570f TL |
300 | } |
301 | ||
880a1e77 JH |
302 | static int |
303 | push_ext(X509 *cert, X509_EXTENSION *ext) | |
e682570f | 304 | { |
3376de6c JH |
305 | if (ext) |
306 | { | |
307 | if (X509_add_ext(cert, ext, -1)) | |
308 | return 1; | |
309 | X509_EXTENSION_free(ext); | |
310 | } | |
311 | DANEerr(DANESSL_F_PUSH_EXT, ERR_R_MALLOC_FAILURE); | |
312 | return 0; | |
e682570f TL |
313 | } |
314 | ||
880a1e77 JH |
315 | static int |
316 | add_ext(X509 *issuer, X509 *subject, int ext_nid, char *ext_val) | |
e682570f | 317 | { |
880a1e77 | 318 | X509V3_CTX v3ctx; |
e682570f | 319 | |
880a1e77 JH |
320 | X509V3_set_ctx(&v3ctx, issuer, subject, 0, 0, 0); |
321 | return push_ext(subject, X509V3_EXT_conf_nid(0, &v3ctx, ext_nid, ext_val)); | |
e682570f TL |
322 | } |
323 | ||
880a1e77 JH |
324 | static int |
325 | set_serial(X509 *cert, AUTHORITY_KEYID *akid, X509 *subject) | |
e682570f | 326 | { |
880a1e77 JH |
327 | int ret = 0; |
328 | BIGNUM *bn; | |
329 | ||
aaba7d03 | 330 | if (akid && akid->serial) |
880a1e77 JH |
331 | return (X509_set_serialNumber(cert, akid->serial)); |
332 | ||
333 | /* | |
334 | * Add one to subject's serial to avoid collisions between TA serial and | |
335 | * serial of signing root. | |
336 | */ | |
aaba7d03 VD |
337 | if ( (bn = ASN1_INTEGER_to_BN(X509_get_serialNumber(subject), 0)) != 0 |
338 | && BN_add_word(bn, 1) | |
339 | && BN_to_ASN1_INTEGER(bn, X509_get_serialNumber(cert))) | |
880a1e77 JH |
340 | ret = 1; |
341 | ||
aaba7d03 | 342 | if (bn) |
880a1e77 JH |
343 | BN_free(bn); |
344 | return ret; | |
345 | } | |
e682570f | 346 | |
880a1e77 JH |
347 | static int |
348 | add_akid(X509 *cert, AUTHORITY_KEYID *akid) | |
349 | { | |
350 | int nid = NID_authority_key_identifier; | |
3376de6c | 351 | ASN1_OCTET_STRING *id; |
880a1e77 JH |
352 | unsigned char c = 0; |
353 | int ret = 0; | |
354 | ||
355 | /* | |
356 | * 0 will never be our subject keyid from a SHA-1 hash, but it could be | |
357 | * our subject keyid if forced from child's akid. If so, set our | |
358 | * authority keyid to 1. This way we are never self-signed, and thus | |
359 | * exempt from any potential (off by default for now in OpenSSL) | |
360 | * self-signature checks! | |
361 | */ | |
3376de6c JH |
362 | id = akid && akid->keyid ? akid->keyid : 0; |
363 | if (id && ASN1_STRING_length(id) == 1 && *ASN1_STRING_get0_data(id) == c) | |
880a1e77 JH |
364 | c = 1; |
365 | ||
aaba7d03 VD |
366 | if ( (akid = AUTHORITY_KEYID_new()) != 0 |
367 | && (akid->keyid = ASN1_OCTET_STRING_new()) != 0 | |
c8dfb21d JH |
368 | #ifdef EXIM_HAVE_ASN1_MACROS |
369 | && ASN1_OCTET_STRING_set(akid->keyid, (void *) &c, 1) | |
370 | #else | |
aaba7d03 | 371 | && M_ASN1_OCTET_STRING_set(akid->keyid, (void *) &c, 1) |
c8dfb21d | 372 | #endif |
aaba7d03 | 373 | && X509_add1_ext_i2d(cert, nid, akid, 0, X509V3_ADD_APPEND)) |
880a1e77 | 374 | ret = 1; |
aaba7d03 | 375 | if (akid) |
880a1e77 JH |
376 | AUTHORITY_KEYID_free(akid); |
377 | return ret; | |
e682570f TL |
378 | } |
379 | ||
880a1e77 JH |
380 | static int |
381 | add_skid(X509 *cert, AUTHORITY_KEYID *akid) | |
e682570f | 382 | { |
880a1e77 | 383 | int nid = NID_subject_key_identifier; |
e682570f | 384 | |
aaba7d03 | 385 | if (!akid || !akid->keyid) |
880a1e77 JH |
386 | return add_ext(0, cert, nid, "hash"); |
387 | return X509_add1_ext_i2d(cert, nid, akid->keyid, 0, X509V3_ADD_APPEND) > 0; | |
e682570f TL |
388 | } |
389 | ||
880a1e77 JH |
390 | static X509_NAME * |
391 | akid_issuer_name(AUTHORITY_KEYID *akid) | |
e682570f | 392 | { |
aaba7d03 | 393 | if (akid && akid->issuer) |
880a1e77 JH |
394 | { |
395 | int i; | |
396 | GENERAL_NAMES *gens = akid->issuer; | |
e682570f | 397 | |
aaba7d03 | 398 | for (i = 0; i < sk_GENERAL_NAME_num(gens); ++i) |
880a1e77 JH |
399 | { |
400 | GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, i); | |
e682570f | 401 | |
aaba7d03 | 402 | if (gn->type == GEN_DIRNAME) |
880a1e77 | 403 | return (gn->d.dirn); |
e682570f | 404 | } |
880a1e77 JH |
405 | } |
406 | return 0; | |
e682570f TL |
407 | } |
408 | ||
880a1e77 JH |
409 | static int |
410 | set_issuer_name(X509 *cert, AUTHORITY_KEYID *akid) | |
e682570f | 411 | { |
880a1e77 JH |
412 | X509_NAME *name = akid_issuer_name(akid); |
413 | ||
414 | /* | |
415 | * If subject's akid specifies an authority key identifer issuer name, we | |
416 | * must use that. | |
417 | */ | |
418 | return X509_set_issuer_name(cert, | |
419 | name ? name : X509_get_subject_name(cert)); | |
e682570f TL |
420 | } |
421 | ||
880a1e77 JH |
422 | static int |
423 | grow_chain(ssl_dane *dane, int trusted, X509 *cert) | |
e682570f | 424 | { |
880a1e77 JH |
425 | STACK_OF(X509) **xs = trusted ? &dane->roots : &dane->chain; |
426 | static ASN1_OBJECT *serverAuth = 0; | |
e682570f TL |
427 | |
428 | #define UNTRUSTED 0 | |
429 | #define TRUSTED 1 | |
430 | ||
aaba7d03 VD |
431 | if ( trusted && !serverAuth |
432 | && !(serverAuth = OBJ_nid2obj(NID_server_auth))) | |
880a1e77 | 433 | { |
aaba7d03 | 434 | DANEerr(DANESSL_F_GROW_CHAIN, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
435 | return 0; |
436 | } | |
aaba7d03 | 437 | if (!*xs && !(*xs = sk_X509_new_null())) |
880a1e77 | 438 | { |
aaba7d03 | 439 | DANEerr(DANESSL_F_GROW_CHAIN, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
440 | return 0; |
441 | } | |
442 | ||
aaba7d03 | 443 | if (cert) |
880a1e77 | 444 | { |
aaba7d03 | 445 | if (trusted && !X509_add1_trust_object(cert, serverAuth)) |
880a1e77 | 446 | return 0; |
c8dfb21d JH |
447 | #ifdef EXIM_OPAQUE_X509 |
448 | X509_up_ref(cert); | |
449 | #else | |
880a1e77 | 450 | CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); |
c8dfb21d | 451 | #endif |
880a1e77 JH |
452 | if (!sk_X509_push(*xs, cert)) |
453 | { | |
454 | X509_free(cert); | |
aaba7d03 | 455 | DANEerr(DANESSL_F_GROW_CHAIN, ERR_R_MALLOC_FAILURE); |
880a1e77 | 456 | return 0; |
e682570f | 457 | } |
880a1e77 JH |
458 | } |
459 | return 1; | |
e682570f TL |
460 | } |
461 | ||
880a1e77 JH |
462 | static int |
463 | wrap_issuer(ssl_dane *dane, EVP_PKEY *key, X509 *subject, int depth, int top) | |
e682570f | 464 | { |
880a1e77 JH |
465 | int ret = 1; |
466 | X509 *cert = 0; | |
467 | AUTHORITY_KEYID *akid; | |
468 | X509_NAME *name = X509_get_issuer_name(subject); | |
469 | EVP_PKEY *newkey = key ? key : X509_get_pubkey(subject); | |
e682570f TL |
470 | |
471 | #define WRAP_MID 0 /* Ensure intermediate. */ | |
472 | #define WRAP_TOP 1 /* Ensure self-signed. */ | |
473 | ||
aaba7d03 | 474 | if (!name || !newkey || !(cert = X509_new())) |
880a1e77 JH |
475 | return 0; |
476 | ||
477 | /* | |
478 | * Record the depth of the trust-anchor certificate. | |
479 | */ | |
aaba7d03 | 480 | if (dane->depth < 0) |
880a1e77 JH |
481 | dane->depth = depth + 1; |
482 | ||
483 | /* | |
484 | * XXX: Uncaught error condition: | |
485 | * | |
486 | * The return value is NULL both when the extension is missing, and when | |
487 | * OpenSSL rans out of memory while parsing the extension. | |
488 | */ | |
489 | ERR_clear_error(); | |
490 | akid = X509_get_ext_d2i(subject, NID_authority_key_identifier, 0, 0); | |
491 | /* XXX: Should we peek at the error stack here??? */ | |
492 | ||
493 | /* | |
494 | * If top is true generate a self-issued root CA, otherwise an | |
495 | * intermediate CA and possibly its self-signed issuer. | |
496 | * | |
497 | * CA cert valid for +/- 30 days | |
498 | */ | |
aaba7d03 VD |
499 | if ( !X509_set_version(cert, 2) |
500 | || !set_serial(cert, akid, subject) | |
aaba7d03 | 501 | || !set_issuer_name(cert, akid) |
3376de6c JH |
502 | || !X509_gmtime_adj(X509_getm_notBefore(cert), -30 * 86400L) |
503 | || !X509_gmtime_adj(X509_getm_notAfter(cert), 30 * 86400L) | |
504 | || !X509_set_subject_name(cert, name) | |
aaba7d03 VD |
505 | || !X509_set_pubkey(cert, newkey) |
506 | || !add_ext(0, cert, NID_basic_constraints, "CA:TRUE") | |
507 | || (!top && !add_akid(cert, akid)) | |
508 | || !add_skid(cert, akid) | |
509 | || ( !top && wrap_to_root | |
510 | && !wrap_issuer(dane, newkey, cert, depth, WRAP_TOP))) | |
880a1e77 JH |
511 | ret = 0; |
512 | ||
aaba7d03 | 513 | if (akid) |
880a1e77 | 514 | AUTHORITY_KEYID_free(akid); |
aaba7d03 | 515 | if (!key) |
880a1e77 | 516 | EVP_PKEY_free(newkey); |
aaba7d03 | 517 | if (ret) |
880a1e77 | 518 | ret = grow_chain(dane, !top && wrap_to_root ? UNTRUSTED : TRUSTED, cert); |
aaba7d03 | 519 | if (cert) |
880a1e77 JH |
520 | X509_free(cert); |
521 | return ret; | |
e682570f TL |
522 | } |
523 | ||
880a1e77 JH |
524 | static int |
525 | wrap_cert(ssl_dane *dane, X509 *tacert, int depth) | |
e682570f | 526 | { |
aaba7d03 | 527 | if (dane->depth < 0) |
880a1e77 JH |
528 | dane->depth = depth + 1; |
529 | ||
530 | /* | |
531 | * If the TA certificate is self-issued, or need not be, use it directly. | |
532 | * Otherwise, synthesize requisuite ancestors. | |
533 | */ | |
aaba7d03 VD |
534 | if ( !wrap_to_root |
535 | || X509_check_issued(tacert, tacert) == X509_V_OK) | |
880a1e77 JH |
536 | return grow_chain(dane, TRUSTED, tacert); |
537 | ||
aaba7d03 | 538 | if (wrap_issuer(dane, 0, tacert, depth, WRAP_MID)) |
880a1e77 JH |
539 | return grow_chain(dane, UNTRUSTED, tacert); |
540 | return 0; | |
e682570f TL |
541 | } |
542 | ||
880a1e77 JH |
543 | static int |
544 | ta_signed(ssl_dane *dane, X509 *cert, int depth) | |
e682570f | 545 | { |
880a1e77 JH |
546 | dane_cert_list x; |
547 | dane_pkey_list k; | |
548 | EVP_PKEY *pk; | |
549 | int done = 0; | |
550 | ||
551 | /* | |
552 | * First check whether issued and signed by a TA cert, this is cheaper | |
553 | * than the bare-public key checks below, since we can determine whether | |
554 | * the candidate TA certificate issued the certificate to be checked | |
555 | * first (name comparisons), before we bother with signature checks | |
556 | * (public key operations). | |
557 | */ | |
558 | for (x = dane->certs; !done && x; x = x->next) | |
559 | { | |
aaba7d03 | 560 | if (X509_check_issued(x->value, cert) == X509_V_OK) |
880a1e77 | 561 | { |
aaba7d03 | 562 | if (!(pk = X509_get_pubkey(x->value))) |
880a1e77 JH |
563 | { |
564 | /* | |
565 | * The cert originally contained a valid pkey, which does | |
566 | * not just vanish, so this is most likely a memory error. | |
567 | */ | |
568 | done = -1; | |
569 | break; | |
570 | } | |
571 | /* Check signature, since some other TA may work if not this. */ | |
aaba7d03 | 572 | if (X509_verify(cert, pk) > 0) |
880a1e77 JH |
573 | done = wrap_cert(dane, x->value, depth) ? 1 : -1; |
574 | EVP_PKEY_free(pk); | |
e682570f | 575 | } |
880a1e77 JH |
576 | } |
577 | ||
578 | /* | |
579 | * With bare TA public keys, we can't check whether the trust chain is | |
580 | * issued by the key, but we can determine whether it is signed by the | |
581 | * key, so we go with that. | |
582 | * | |
583 | * Ideally, the corresponding certificate was presented in the chain, and we | |
584 | * matched it by its public key digest one level up. This code is here | |
585 | * to handle adverse conditions imposed by sloppy administrators of | |
586 | * receiving systems with poorly constructed chains. | |
587 | * | |
588 | * We'd like to optimize out keys that should not match when the cert's | |
589 | * authority key id does not match the key id of this key computed via | |
590 | * the RFC keyid algorithm (SHA-1 digest of public key bit-string sans | |
591 | * ASN1 tag and length thus also excluding the unused bits field that is | |
592 | * logically part of the length). However, some CAs have a non-standard | |
593 | * authority keyid, so we lose. Too bad. | |
594 | * | |
595 | * This may push errors onto the stack when the certificate signature is | |
596 | * not of the right type or length, throw these away, | |
597 | */ | |
aaba7d03 VD |
598 | for (k = dane->pkeys; !done && k; k = k->next) |
599 | if (X509_verify(cert, k->value) > 0) | |
880a1e77 JH |
600 | done = wrap_issuer(dane, k->value, cert, depth, WRAP_MID) ? 1 : -1; |
601 | else | |
602 | ERR_clear_error(); | |
e682570f | 603 | |
880a1e77 | 604 | return done; |
e682570f TL |
605 | } |
606 | ||
880a1e77 JH |
607 | static int |
608 | set_trust_anchor(X509_STORE_CTX *ctx, ssl_dane *dane, X509 *cert) | |
e682570f | 609 | { |
880a1e77 JH |
610 | int matched = 0; |
611 | int n; | |
612 | int i; | |
613 | int depth = 0; | |
614 | EVP_PKEY *takey; | |
615 | X509 *ca; | |
e3555426 | 616 | STACK_OF(X509) *in = X509_STORE_CTX_get0_untrusted(ctx); |
880a1e77 | 617 | |
aaba7d03 | 618 | if (!grow_chain(dane, UNTRUSTED, 0)) |
880a1e77 JH |
619 | return -1; |
620 | ||
621 | /* | |
622 | * Accept a degenerate case: depth 0 self-signed trust-anchor. | |
623 | */ | |
aaba7d03 | 624 | if (X509_check_issued(cert, cert) == X509_V_OK) |
880a1e77 JH |
625 | { |
626 | dane->depth = 0; | |
aaba7d03 VD |
627 | matched = match(dane->selectors[DANESSL_USAGE_DANE_TA], cert, 0); |
628 | if (matched > 0 && !grow_chain(dane, TRUSTED, cert)) | |
880a1e77 JH |
629 | matched = -1; |
630 | return matched; | |
631 | } | |
632 | ||
633 | /* Make a shallow copy of the input untrusted chain. */ | |
aaba7d03 | 634 | if (!(in = sk_X509_dup(in))) |
880a1e77 | 635 | { |
aaba7d03 | 636 | DANEerr(DANESSL_F_SET_TRUST_ANCHOR, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
637 | return -1; |
638 | } | |
639 | ||
640 | /* | |
641 | * At each iteration we consume the issuer of the current cert. This | |
642 | * reduces the length of the "in" chain by one. If no issuer is found, | |
643 | * we are done. We also stop when a certificate matches a TA in the | |
644 | * peer's TLSA RRset. | |
645 | * | |
646 | * Caller ensures that the initial certificate is not self-signed. | |
647 | */ | |
aaba7d03 | 648 | for (n = sk_X509_num(in); n > 0; --n, ++depth) |
880a1e77 | 649 | { |
aaba7d03 VD |
650 | for (i = 0; i < n; ++i) |
651 | if (X509_check_issued(sk_X509_value(in, i), cert) == X509_V_OK) | |
880a1e77 JH |
652 | break; |
653 | ||
654 | /* | |
655 | * Final untrusted element with no issuer in the peer's chain, it may | |
656 | * however be signed by a pkey or cert obtained via a TLSA RR. | |
657 | */ | |
aaba7d03 | 658 | if (i == n) |
880a1e77 JH |
659 | break; |
660 | ||
661 | /* Peer's chain contains an issuer ca. */ | |
662 | ca = sk_X509_delete(in, i); | |
663 | ||
664 | /* If not a trust anchor, record untrusted ca and continue. */ | |
aaba7d03 VD |
665 | if ((matched = match(dane->selectors[DANESSL_USAGE_DANE_TA], ca, |
666 | depth + 1)) == 0) | |
880a1e77 | 667 | { |
aaba7d03 | 668 | if (grow_chain(dane, UNTRUSTED, ca)) |
880a1e77 | 669 | { |
aaba7d03 | 670 | if (!X509_check_issued(ca, ca) == X509_V_OK) |
880a1e77 JH |
671 | { |
672 | /* Restart with issuer as subject */ | |
673 | cert = ca; | |
674 | continue; | |
675 | } | |
676 | /* Final self-signed element, skip ta_signed() check. */ | |
677 | cert = 0; | |
678 | } | |
679 | else | |
680 | matched = -1; | |
e682570f | 681 | } |
880a1e77 JH |
682 | else if(matched == MATCHED_CERT) |
683 | { | |
684 | if(!wrap_cert(dane, ca, depth)) | |
685 | matched = -1; | |
e682570f | 686 | } |
880a1e77 JH |
687 | else if(matched == MATCHED_PKEY) |
688 | { | |
aaba7d03 VD |
689 | if ( !(takey = X509_get_pubkey(ca)) |
690 | || !wrap_issuer(dane, takey, cert, depth, WRAP_MID)) | |
880a1e77 | 691 | { |
aaba7d03 | 692 | if (takey) |
880a1e77 JH |
693 | EVP_PKEY_free(takey); |
694 | else | |
aaba7d03 | 695 | DANEerr(DANESSL_F_SET_TRUST_ANCHOR, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
696 | matched = -1; |
697 | } | |
e682570f | 698 | } |
880a1e77 JH |
699 | break; |
700 | } | |
e682570f | 701 | |
880a1e77 JH |
702 | /* Shallow free the duplicated input untrusted chain. */ |
703 | sk_X509_free(in); | |
e682570f | 704 | |
880a1e77 JH |
705 | /* |
706 | * When the loop exits, if "cert" is set, it is not self-signed and has | |
707 | * no issuer in the chain, we check for a possible signature via a DNS | |
708 | * obtained TA cert or public key. | |
709 | */ | |
aaba7d03 | 710 | if (matched == 0 && cert) |
880a1e77 | 711 | matched = ta_signed(dane, cert, depth); |
e682570f | 712 | |
880a1e77 | 713 | return matched; |
e682570f TL |
714 | } |
715 | ||
880a1e77 JH |
716 | static int |
717 | check_end_entity(X509_STORE_CTX *ctx, ssl_dane *dane, X509 *cert) | |
e682570f | 718 | { |
880a1e77 JH |
719 | int matched; |
720 | ||
aaba7d03 VD |
721 | matched = match(dane->selectors[DANESSL_USAGE_DANE_EE], cert, 0); |
722 | if (matched > 0) | |
723 | { | |
724 | dane->mdpth = 0; | |
725 | dane->match = cert; | |
726 | X509_up_ref(cert); | |
e3555426 | 727 | if(!X509_STORE_CTX_get0_chain(ctx)) |
85098ee7 | 728 | { |
e3555426 JH |
729 | STACK_OF(X509) * sk = sk_X509_new_null(); |
730 | if (sk && sk_X509_push(sk, cert)) | |
731 | { | |
aaba7d03 | 732 | X509_up_ref(cert); |
3376de6c | 733 | X509_STORE_CTX_set0_verified_chain(ctx, sk); |
e3555426 | 734 | } |
880a1e77 JH |
735 | else |
736 | { | |
3376de6c | 737 | if (sk) sk_X509_free(sk); |
aaba7d03 | 738 | DANEerr(DANESSL_F_CHECK_END_ENTITY, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
739 | return -1; |
740 | } | |
85098ee7 | 741 | } |
aaba7d03 | 742 | } |
880a1e77 | 743 | return matched; |
e682570f TL |
744 | } |
745 | ||
880a1e77 JH |
746 | static int |
747 | match_name(const char *certid, ssl_dane *dane) | |
e682570f | 748 | { |
880a1e77 JH |
749 | int multi = dane->multi; |
750 | dane_host_list hosts; | |
751 | ||
aaba7d03 | 752 | for (hosts = dane->hosts; hosts; hosts = hosts->next) |
880a1e77 JH |
753 | { |
754 | int match_subdomain = 0; | |
755 | const char *domain = hosts->value; | |
756 | const char *parent; | |
757 | int idlen; | |
758 | int domlen; | |
759 | ||
aaba7d03 | 760 | if (*domain == '.' && domain[1] != '\0') |
880a1e77 JH |
761 | { |
762 | ++domain; | |
763 | match_subdomain = 1; | |
e682570f | 764 | } |
880a1e77 JH |
765 | |
766 | /* | |
767 | * Sub-domain match: certid is any sub-domain of hostname. | |
768 | */ | |
769 | if(match_subdomain) | |
85098ee7 | 770 | { |
aaba7d03 VD |
771 | if ( (idlen = strlen(certid)) > (domlen = strlen(domain)) + 1 |
772 | && certid[idlen - domlen - 1] == '.' | |
773 | && !strcasecmp(certid + (idlen - domlen), domain)) | |
880a1e77 JH |
774 | return 1; |
775 | else | |
776 | continue; | |
85098ee7 | 777 | } |
880a1e77 JH |
778 | |
779 | /* | |
780 | * Exact match and initial "*" match. The initial "*" in a certid | |
781 | * matches one (if multi is false) or more hostname components under | |
782 | * the condition that the certid contains multiple hostname components. | |
783 | */ | |
aaba7d03 VD |
784 | if ( !strcasecmp(certid, domain) |
785 | || ( certid[0] == '*' && certid[1] == '.' && certid[2] != 0 | |
786 | && (parent = strchr(domain, '.')) != 0 | |
787 | && (idlen = strlen(certid + 1)) <= (domlen = strlen(parent)) | |
788 | && strcasecmp(multi ? parent + domlen - idlen : parent, certid+1) == 0)) | |
880a1e77 JH |
789 | return 1; |
790 | } | |
791 | return 0; | |
e682570f TL |
792 | } |
793 | ||
3376de6c JH |
794 | static const char * |
795 | check_name(const char *name, int len) | |
e682570f | 796 | { |
3376de6c | 797 | const char *cp = name + len; |
880a1e77 | 798 | |
aaba7d03 | 799 | while (len > 0 && !*--cp) |
880a1e77 | 800 | --len; /* Ignore trailing NULs */ |
aaba7d03 | 801 | if (len <= 0) |
880a1e77 | 802 | return 0; |
aaba7d03 | 803 | for (cp = name; *cp; cp++) |
880a1e77 JH |
804 | { |
805 | char c = *cp; | |
806 | if (!((c >= 'a' && c <= 'z') || | |
807 | (c >= '0' && c <= '9') || | |
808 | (c >= 'A' && c <= 'Z') || | |
809 | (c == '.' || c == '-') || | |
810 | (c == '*'))) | |
811 | return 0; /* Only LDH, '.' and '*' */ | |
812 | } | |
aaba7d03 | 813 | if (cp - name != len) /* Guard against internal NULs */ |
880a1e77 JH |
814 | return 0; |
815 | return name; | |
e682570f TL |
816 | } |
817 | ||
3376de6c | 818 | static const char * |
880a1e77 | 819 | parse_dns_name(const GENERAL_NAME *gn) |
e682570f | 820 | { |
aaba7d03 | 821 | if (gn->type != GEN_DNS) |
880a1e77 | 822 | return 0; |
aaba7d03 | 823 | if (ASN1_STRING_type(gn->d.ia5) != V_ASN1_IA5STRING) |
880a1e77 | 824 | return 0; |
3376de6c | 825 | return check_name((const char *) ASN1_STRING_get0_data(gn->d.ia5), |
880a1e77 | 826 | ASN1_STRING_length(gn->d.ia5)); |
e682570f TL |
827 | } |
828 | ||
880a1e77 JH |
829 | static char * |
830 | parse_subject_name(X509 *cert) | |
e682570f | 831 | { |
880a1e77 JH |
832 | X509_NAME *name = X509_get_subject_name(cert); |
833 | X509_NAME_ENTRY *entry; | |
834 | ASN1_STRING *entry_str; | |
835 | unsigned char *namebuf; | |
836 | int nid = NID_commonName; | |
837 | int len; | |
838 | int i; | |
839 | ||
aaba7d03 | 840 | if (!name || (i = X509_NAME_get_index_by_NID(name, nid, -1)) < 0) |
880a1e77 | 841 | return 0; |
aaba7d03 | 842 | if (!(entry = X509_NAME_get_entry(name, i))) |
880a1e77 | 843 | return 0; |
aaba7d03 | 844 | if (!(entry_str = X509_NAME_ENTRY_get_data(entry))) |
880a1e77 JH |
845 | return 0; |
846 | ||
aaba7d03 | 847 | if ((len = ASN1_STRING_to_UTF8(&namebuf, entry_str)) < 0) |
880a1e77 | 848 | return 0; |
aaba7d03 | 849 | if (len <= 0 || check_name((char *) namebuf, len) == 0) |
880a1e77 JH |
850 | { |
851 | OPENSSL_free(namebuf); | |
852 | return 0; | |
853 | } | |
854 | return (char *) namebuf; | |
e682570f TL |
855 | } |
856 | ||
880a1e77 JH |
857 | static int |
858 | name_check(ssl_dane *dane, X509 *cert) | |
e682570f | 859 | { |
880a1e77 JH |
860 | int matched = 0; |
861 | BOOL got_altname = FALSE; | |
862 | GENERAL_NAMES *gens; | |
863 | ||
864 | gens = X509_get_ext_d2i(cert, NID_subject_alt_name, 0, 0); | |
aaba7d03 | 865 | if (gens) |
880a1e77 JH |
866 | { |
867 | int n = sk_GENERAL_NAME_num(gens); | |
868 | int i; | |
869 | ||
aaba7d03 | 870 | for (i = 0; i < n; ++i) |
880a1e77 JH |
871 | { |
872 | const GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, i); | |
873 | const char *certid; | |
874 | ||
aaba7d03 | 875 | if (gn->type != GEN_DNS) |
880a1e77 JH |
876 | continue; |
877 | got_altname = TRUE; | |
878 | certid = parse_dns_name(gn); | |
aaba7d03 | 879 | if (certid && *certid) |
880a1e77 | 880 | { |
aaba7d03 | 881 | if ((matched = match_name(certid, dane)) == 0) |
880a1e77 | 882 | continue; |
aaba7d03 | 883 | if (!(dane->mhost = OPENSSL_strdup(certid))) |
880a1e77 | 884 | matched = -1; |
f2f2c91b | 885 | DEBUG(D_tls) debug_printf("Dane name_check: matched SAN %s\n", certid); |
880a1e77 JH |
886 | break; |
887 | } | |
e682570f | 888 | } |
880a1e77 JH |
889 | GENERAL_NAMES_free(gens); |
890 | } | |
891 | ||
892 | /* | |
893 | * XXX: Should the subjectName be skipped when *any* altnames are present, | |
894 | * or only when DNS altnames are present? | |
895 | */ | |
f2f2c91b | 896 | if (!got_altname) |
880a1e77 JH |
897 | { |
898 | char *certid = parse_subject_name(cert); | |
f2f2c91b JH |
899 | if (certid != 0 && *certid && (matched = match_name(certid, dane)) != 0) |
900 | { | |
901 | DEBUG(D_tls) debug_printf("Dane name_check: matched SN %s\n", certid); | |
aaba7d03 | 902 | dane->mhost = OPENSSL_strdup(certid); |
f2f2c91b JH |
903 | } |
904 | if (certid) | |
905 | OPENSSL_free(certid); | |
880a1e77 JH |
906 | } |
907 | return matched; | |
e682570f TL |
908 | } |
909 | ||
880a1e77 JH |
910 | static int |
911 | verify_chain(X509_STORE_CTX *ctx) | |
e682570f | 912 | { |
e3555426 JH |
913 | int (*cb)(int, X509_STORE_CTX *) = X509_STORE_CTX_get_verify_cb(ctx); |
914 | X509 *cert = X509_STORE_CTX_get0_cert(ctx); | |
3376de6c JH |
915 | STACK_OF(X509) * chain = X509_STORE_CTX_get0_chain(ctx); |
916 | int chain_length = sk_X509_num(chain); | |
880a1e77 JH |
917 | int ssl_idx = SSL_get_ex_data_X509_STORE_CTX_idx(); |
918 | SSL *ssl = X509_STORE_CTX_get_ex_data(ctx, ssl_idx); | |
919 | ssl_dane *dane = SSL_get_ex_data(ssl, dane_idx); | |
e3555426 JH |
920 | dane_selector_list issuer_rrs = dane->selectors[DANESSL_USAGE_PKIX_TA]; |
921 | dane_selector_list leaf_rrs = dane->selectors[DANESSL_USAGE_PKIX_EE]; | |
880a1e77 | 922 | int matched = 0; |
880a1e77 | 923 | |
f2f2c91b | 924 | DEBUG(D_tls) debug_printf("Dane verify_chain\n"); |
6634ac8d | 925 | |
3376de6c | 926 | /* Restore OpenSSL's internal_verify() as the signature check function */ |
e3555426 | 927 | X509_STORE_CTX_set_verify(ctx, dane->verify); |
880a1e77 | 928 | |
aaba7d03 | 929 | if ((matched = name_check(dane, cert)) < 0) |
880a1e77 JH |
930 | { |
931 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_OUT_OF_MEM); | |
932 | return 0; | |
933 | } | |
934 | ||
aaba7d03 | 935 | if (!matched) |
880a1e77 | 936 | { |
e3555426 JH |
937 | X509_STORE_CTX_set_error_depth(ctx, 0); |
938 | X509_STORE_CTX_set_current_cert(ctx, cert); | |
880a1e77 | 939 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH); |
aaba7d03 | 940 | if (!cb(0, ctx)) |
880a1e77 JH |
941 | return 0; |
942 | } | |
943 | matched = 0; | |
944 | ||
f2f2c91b JH |
945 | /* |
946 | * Satisfy at least one usage 0 or 1 constraint, unless we've already | |
947 | * matched a usage 2 trust anchor. | |
948 | * | |
949 | * XXX: internal_verify() doesn't callback with top certs that are not | |
3376de6c | 950 | * self-issued. This is fixed in OpenSSL 1.1.0. |
f2f2c91b JH |
951 | */ |
952 | if (dane->roots && sk_X509_num(dane->roots)) | |
953 | { | |
3376de6c | 954 | X509 *top = sk_X509_value(chain, dane->depth); |
880a1e77 | 955 | |
f2f2c91b JH |
956 | dane->mdpth = dane->depth; |
957 | dane->match = top; | |
958 | X509_up_ref(top); | |
aaba7d03 | 959 | |
3376de6c | 960 | #if OPENSSL_VERSION_NUMBER < 0x10100000L |
f2f2c91b JH |
961 | if (X509_check_issued(top, top) != X509_V_OK) |
962 | { | |
e3555426 JH |
963 | X509_STORE_CTX_set_error_depth(ctx, dane->depth); |
964 | X509_STORE_CTX_set_current_cert(ctx, top); | |
f2f2c91b JH |
965 | if (!cb(1, ctx)) |
966 | return 0; | |
967 | } | |
880a1e77 JH |
968 | #endif |
969 | /* Pop synthetic trust-anchor ancestors off the chain! */ | |
970 | while (--chain_length > dane->depth) | |
3376de6c | 971 | X509_free(sk_X509_pop(chain)); |
880a1e77 | 972 | } |
aaba7d03 | 973 | else |
880a1e77 | 974 | { |
aaba7d03 VD |
975 | int n = 0; |
976 | X509 *xn = cert; | |
880a1e77 JH |
977 | |
978 | /* | |
979 | * Check for an EE match, then a CA match at depths > 0, and | |
980 | * finally, if the EE cert is self-issued, for a depth 0 CA match. | |
981 | */ | |
aaba7d03 VD |
982 | if (leaf_rrs) |
983 | matched = match(leaf_rrs, xn, 0); | |
f2f2c91b | 984 | if (matched) DEBUG(D_tls) debug_printf("Dane verify_chain: matched EE\n"); |
880a1e77 | 985 | |
f92c5522 VD |
986 | if (!matched && issuer_rrs) |
987 | for (n = chain_length-1; !matched && n >= 0; --n) | |
aaba7d03 | 988 | { |
3376de6c | 989 | xn = sk_X509_value(chain, n); |
f92c5522 VD |
990 | if (n > 0 || X509_check_issued(xn, xn) == X509_V_OK) |
991 | matched = match(issuer_rrs, xn, n); | |
aaba7d03 | 992 | } |
f2f2c91b JH |
993 | if (matched) DEBUG(D_tls) debug_printf("Dane verify_chain: matched %s\n", |
994 | n>0 ? "CA" : "selfisssued EE"); | |
f92c5522 VD |
995 | |
996 | if (!matched) | |
997 | { | |
e3555426 JH |
998 | X509_STORE_CTX_set_error_depth(ctx, 0); |
999 | X509_STORE_CTX_set_current_cert(ctx, cert); | |
f92c5522 VD |
1000 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_CERT_UNTRUSTED); |
1001 | if (!cb(0, ctx)) | |
1002 | return 0; | |
1003 | } | |
1004 | else | |
1005 | { | |
1006 | dane->mdpth = n; | |
1007 | dane->match = xn; | |
1008 | X509_up_ref(xn); | |
e682570f | 1009 | } |
f92c5522 | 1010 | } |
e682570f | 1011 | |
3376de6c JH |
1012 | /* Tail recurse into OpenSSL's internal_verify */ |
1013 | return dane->verify(ctx); | |
aaba7d03 | 1014 | } |
e682570f | 1015 | |
aaba7d03 VD |
1016 | static void |
1017 | dane_reset(ssl_dane *dane) | |
1018 | { | |
1019 | dane->depth = -1; | |
1020 | if (dane->mhost) | |
1021 | { | |
1022 | OPENSSL_free(dane->mhost); | |
1023 | dane->mhost = 0; | |
880a1e77 | 1024 | } |
aaba7d03 VD |
1025 | if (dane->roots) |
1026 | { | |
1027 | sk_X509_pop_free(dane->roots, X509_free); | |
1028 | dane->roots = 0; | |
1029 | } | |
1030 | if (dane->chain) | |
1031 | { | |
1032 | sk_X509_pop_free(dane->chain, X509_free); | |
1033 | dane->chain = 0; | |
1034 | } | |
1035 | if (dane->match) | |
1036 | { | |
1037 | X509_free(dane->match); | |
1038 | dane->match = 0; | |
1039 | } | |
1040 | dane->mdpth = -1; | |
e682570f TL |
1041 | } |
1042 | ||
880a1e77 JH |
1043 | static int |
1044 | verify_cert(X509_STORE_CTX *ctx, void *unused_ctx) | |
e682570f | 1045 | { |
880a1e77 JH |
1046 | static int ssl_idx = -1; |
1047 | SSL *ssl; | |
1048 | ssl_dane *dane; | |
e3555426 JH |
1049 | int (*cb)(int, X509_STORE_CTX *) = X509_STORE_CTX_get_verify_cb(ctx); |
1050 | X509 *cert = X509_STORE_CTX_get0_cert(ctx); | |
880a1e77 | 1051 | int matched; |
880a1e77 | 1052 | |
f2f2c91b | 1053 | DEBUG(D_tls) debug_printf("Dane verify_cert\n"); |
6634ac8d | 1054 | |
aaba7d03 | 1055 | if (ssl_idx < 0) |
880a1e77 | 1056 | ssl_idx = SSL_get_ex_data_X509_STORE_CTX_idx(); |
aaba7d03 | 1057 | if (dane_idx < 0) |
880a1e77 | 1058 | { |
aaba7d03 | 1059 | DANEerr(DANESSL_F_VERIFY_CERT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1060 | return -1; |
1061 | } | |
1062 | ||
1063 | ssl = X509_STORE_CTX_get_ex_data(ctx, ssl_idx); | |
aaba7d03 | 1064 | if (!(dane = SSL_get_ex_data(ssl, dane_idx)) || !cert) |
880a1e77 JH |
1065 | return X509_verify_cert(ctx); |
1066 | ||
f2f2c91b | 1067 | /* Reset for verification of a new chain, perhaps a renegotiation. */ |
aaba7d03 VD |
1068 | dane_reset(dane); |
1069 | ||
1070 | if (dane->selectors[DANESSL_USAGE_DANE_EE]) | |
880a1e77 | 1071 | { |
aaba7d03 | 1072 | if ((matched = check_end_entity(ctx, dane, cert)) > 0) |
880a1e77 | 1073 | { |
e3555426 JH |
1074 | X509_STORE_CTX_set_error_depth(ctx, 0); |
1075 | X509_STORE_CTX_set_current_cert(ctx, cert); | |
880a1e77 | 1076 | return cb(1, ctx); |
e682570f | 1077 | } |
aaba7d03 | 1078 | if (matched < 0) |
880a1e77 JH |
1079 | { |
1080 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_OUT_OF_MEM); | |
1081 | return -1; | |
e682570f | 1082 | } |
880a1e77 | 1083 | } |
e682570f | 1084 | |
aaba7d03 | 1085 | if (dane->selectors[DANESSL_USAGE_DANE_TA]) |
880a1e77 | 1086 | { |
aaba7d03 VD |
1087 | if ((matched = set_trust_anchor(ctx, dane, cert)) < 0) |
1088 | { | |
1089 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_OUT_OF_MEM); | |
1090 | return -1; | |
1091 | } | |
1092 | if (matched) | |
1093 | { | |
1094 | /* | |
1095 | * Check that setting the untrusted chain updates the expected | |
1096 | * structure member at the expected offset. | |
1097 | */ | |
1098 | X509_STORE_CTX_trusted_stack(ctx, dane->roots); | |
1099 | X509_STORE_CTX_set_chain(ctx, dane->chain); | |
3376de6c | 1100 | OPENSSL_assert(dane->chain == X509_STORE_CTX_get0_untrusted(ctx)); |
aaba7d03 | 1101 | } |
880a1e77 | 1102 | } |
e682570f | 1103 | |
aaba7d03 VD |
1104 | /* |
1105 | * Name checks and usage 0/1 constraint enforcement are delayed until | |
1106 | * X509_verify_cert() builds the full chain and calls our verify_chain() | |
1107 | * wrapper. | |
1108 | */ | |
e3555426 JH |
1109 | dane->verify = X509_STORE_CTX_get_verify(ctx); |
1110 | X509_STORE_CTX_set_verify(ctx, verify_chain); | |
aaba7d03 VD |
1111 | |
1112 | if (X509_verify_cert(ctx)) | |
1113 | return 1; | |
880a1e77 | 1114 | |
aaba7d03 VD |
1115 | /* |
1116 | * If the chain is invalid, clear any matching cert or hostname, to | |
1117 | * protect callers that might erroneously rely on these alone without | |
1118 | * checking the validation status. | |
1119 | */ | |
1120 | if (dane->match) | |
1121 | { | |
1122 | X509_free(dane->match); | |
1123 | dane->match = 0; | |
1124 | } | |
1125 | if (dane->mhost) | |
1126 | { | |
1127 | OPENSSL_free(dane->mhost); | |
1128 | dane->mhost = 0; | |
1129 | } | |
1130 | return 0; | |
e682570f TL |
1131 | } |
1132 | ||
880a1e77 JH |
1133 | static dane_list |
1134 | list_alloc(size_t vsize) | |
e682570f | 1135 | { |
880a1e77 JH |
1136 | void *value = (void *) OPENSSL_malloc(vsize); |
1137 | dane_list l; | |
1138 | ||
aaba7d03 | 1139 | if (!value) |
880a1e77 | 1140 | { |
aaba7d03 | 1141 | DANEerr(DANESSL_F_LIST_ALLOC, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1142 | return 0; |
1143 | } | |
aaba7d03 | 1144 | if (!(l = (dane_list) OPENSSL_malloc(sizeof(*l)))) |
880a1e77 JH |
1145 | { |
1146 | OPENSSL_free(value); | |
aaba7d03 | 1147 | DANEerr(DANESSL_F_LIST_ALLOC, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1148 | return 0; |
1149 | } | |
1150 | l->next = 0; | |
1151 | l->value = value; | |
1152 | return l; | |
e682570f TL |
1153 | } |
1154 | ||
880a1e77 JH |
1155 | static void |
1156 | list_free(void *list, void (*f)(void *)) | |
e682570f | 1157 | { |
880a1e77 JH |
1158 | dane_list head; |
1159 | dane_list next; | |
1160 | ||
aaba7d03 | 1161 | for (head = (dane_list) list; head; head = next) |
880a1e77 JH |
1162 | { |
1163 | next = head->next; | |
1164 | if (f && head->value) | |
1165 | f(head->value); | |
1166 | OPENSSL_free(head); | |
1167 | } | |
e682570f TL |
1168 | } |
1169 | ||
3376de6c JH |
1170 | static void |
1171 | ossl_free(void * p) | |
1172 | { | |
1173 | OPENSSL_free(p); | |
1174 | } | |
1175 | ||
880a1e77 JH |
1176 | static void |
1177 | dane_mtype_free(void *p) | |
e682570f | 1178 | { |
3376de6c | 1179 | list_free(((dane_mtype) p)->data, ossl_free); |
880a1e77 | 1180 | OPENSSL_free(p); |
e682570f TL |
1181 | } |
1182 | ||
880a1e77 JH |
1183 | static void |
1184 | dane_selector_free(void *p) | |
e682570f | 1185 | { |
880a1e77 JH |
1186 | list_free(((dane_selector) p)->mtype, dane_mtype_free); |
1187 | OPENSSL_free(p); | |
e682570f TL |
1188 | } |
1189 | ||
946ecbe0 JH |
1190 | |
1191 | ||
1192 | /* | |
1193 | ||
1194 | Tidy up once the connection is finished with. | |
1195 | ||
1196 | Arguments | |
1197 | ssl The ssl connection handle | |
1198 | ||
1199 | => Before calling SSL_free() | |
1200 | tls_close() and tls_getc() [the error path] are the obvious places. | |
1201 | Could we do it earlier - right after verification? In tls_client_start() | |
1202 | right after SSL_connect() returns, in that case. | |
1203 | ||
1204 | */ | |
1205 | ||
880a1e77 JH |
1206 | void |
1207 | DANESSL_cleanup(SSL *ssl) | |
e682570f | 1208 | { |
880a1e77 JH |
1209 | ssl_dane *dane; |
1210 | int u; | |
1211 | ||
e5cccda9 | 1212 | DEBUG(D_tls) debug_printf("Dane lib-cleanup\n"); |
6634ac8d | 1213 | |
aaba7d03 | 1214 | if (dane_idx < 0 || !(dane = SSL_get_ex_data(ssl, dane_idx))) |
880a1e77 JH |
1215 | return; |
1216 | (void) SSL_set_ex_data(ssl, dane_idx, 0); | |
1217 | ||
aaba7d03 VD |
1218 | dane_reset(dane); |
1219 | if (dane->hosts) | |
3376de6c | 1220 | list_free(dane->hosts, ossl_free); |
aaba7d03 VD |
1221 | for (u = 0; u <= DANESSL_USAGE_LAST; ++u) |
1222 | if (dane->selectors[u]) | |
880a1e77 | 1223 | list_free(dane->selectors[u], dane_selector_free); |
aaba7d03 | 1224 | if (dane->pkeys) |
880a1e77 | 1225 | list_free(dane->pkeys, pkey_free); |
aaba7d03 | 1226 | if (dane->certs) |
880a1e77 | 1227 | list_free(dane->certs, cert_free); |
880a1e77 | 1228 | OPENSSL_free(dane); |
e682570f TL |
1229 | } |
1230 | ||
880a1e77 JH |
1231 | static dane_host_list |
1232 | host_list_init(const char **src) | |
e682570f | 1233 | { |
880a1e77 JH |
1234 | dane_host_list head = NULL; |
1235 | ||
aaba7d03 | 1236 | while (*src) |
880a1e77 JH |
1237 | { |
1238 | dane_host_list elem = (dane_host_list) OPENSSL_malloc(sizeof(*elem)); | |
aaba7d03 | 1239 | if (elem == 0) |
880a1e77 | 1240 | { |
3376de6c | 1241 | list_free(head, ossl_free); |
880a1e77 | 1242 | return 0; |
e682570f | 1243 | } |
880a1e77 JH |
1244 | elem->value = OPENSSL_strdup(*src++); |
1245 | LINSERT(head, elem); | |
1246 | } | |
1247 | return head; | |
e682570f TL |
1248 | } |
1249 | ||
946ecbe0 | 1250 | |
aaba7d03 VD |
1251 | int |
1252 | DANESSL_get_match_cert(SSL *ssl, X509 **match, const char **mhost, int *depth) | |
1253 | { | |
1254 | ssl_dane *dane; | |
1255 | ||
1256 | if (dane_idx < 0 || (dane = SSL_get_ex_data(ssl, dane_idx)) == 0) | |
1257 | { | |
1258 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_INIT); | |
1259 | return -1; | |
1260 | } | |
1261 | ||
1262 | if (dane->match) | |
1263 | { | |
1264 | if (match) | |
1265 | *match = dane->match; | |
1266 | if (mhost) | |
1267 | *mhost = dane->mhost; | |
1268 | if (depth) | |
1269 | *depth = dane->mdpth; | |
1270 | } | |
1271 | ||
1272 | return (dane->match != 0); | |
1273 | } | |
1274 | ||
1275 | ||
1276 | #ifdef never_called | |
1277 | int | |
1278 | DANESSL_verify_chain(SSL *ssl, STACK_OF(X509) *chain) | |
1279 | { | |
1280 | int ret; | |
1281 | X509 *cert; | |
3376de6c | 1282 | X509_STORE_CTX * store_ctx; |
aaba7d03 VD |
1283 | SSL_CTX *ssl_ctx = SSL_get_SSL_CTX(ssl); |
1284 | X509_STORE *store = SSL_CTX_get_cert_store(ssl_ctx); | |
1285 | int store_ctx_idx = SSL_get_ex_data_X509_STORE_CTX_idx(); | |
1286 | ||
1287 | cert = sk_X509_value(chain, 0); | |
3376de6c JH |
1288 | if (!(store_ctx = X509_STORE_CTX_new())) |
1289 | { | |
1290 | DANEerr(DANESSL_F_DANESSL_VERIFY_CHAIN, ERR_R_MALLOC_FAILURE); | |
1291 | return 0; | |
1292 | } | |
1293 | if (!X509_STORE_CTX_init(store_ctx, store, cert, chain)) | |
1294 | { | |
1295 | X509_STORE_CTX_free(store_ctx); | |
aaba7d03 | 1296 | return 0; |
3376de6c JH |
1297 | } |
1298 | X509_STORE_CTX_set_ex_data(store_ctx, store_ctx_idx, ssl); | |
aaba7d03 | 1299 | |
3376de6c | 1300 | X509_STORE_CTX_set_default(store_ctx, |
aaba7d03 | 1301 | SSL_is_server(ssl) ? "ssl_client" : "ssl_server"); |
3376de6c | 1302 | X509_VERIFY_PARAM_set1(X509_STORE_CTX_get0_param(store_ctx), |
aaba7d03 VD |
1303 | SSL_get0_param(ssl)); |
1304 | ||
1305 | if (SSL_get_verify_callback(ssl)) | |
3376de6c | 1306 | X509_STORE_CTX_set_verify_cb(store_ctx, SSL_get_verify_callback(ssl)); |
aaba7d03 | 1307 | |
3376de6c | 1308 | ret = verify_cert(store_ctx, NULL); |
aaba7d03 | 1309 | |
3376de6c JH |
1310 | SSL_set_verify_result(ssl, X509_STORE_CTX_get_error(store_ctx)); |
1311 | X509_STORE_CTX_cleanup(store_ctx); | |
aaba7d03 VD |
1312 | |
1313 | return (ret); | |
1314 | } | |
1315 | #endif | |
1316 | ||
1317 | ||
946ecbe0 JH |
1318 | |
1319 | ||
1320 | /* | |
1321 | ||
1322 | Call this for each TLSA record found for the target, after the | |
1323 | DANE setup has been done on the ssl connection handle. | |
1324 | ||
1325 | Arguments: | |
1326 | ssl Connection handle | |
1327 | usage TLSA record field | |
1328 | selector TLSA record field | |
1329 | mdname ??? message digest name? | |
1330 | data ??? TLSA record megalump? | |
1331 | dlen length of data | |
1332 | ||
1333 | Return | |
1334 | -1 on error | |
1335 | 0 action not taken | |
1336 | 1 record accepted | |
1337 | */ | |
1338 | ||
880a1e77 JH |
1339 | int |
1340 | DANESSL_add_tlsa(SSL *ssl, uint8_t usage, uint8_t selector, const char *mdname, | |
1341 | unsigned const char *data, size_t dlen) | |
e682570f | 1342 | { |
880a1e77 JH |
1343 | ssl_dane *dane; |
1344 | dane_selector_list s = 0; | |
1345 | dane_mtype_list m = 0; | |
1346 | dane_data_list d = 0; | |
1347 | dane_cert_list xlist = 0; | |
1348 | dane_pkey_list klist = 0; | |
1349 | const EVP_MD *md = 0; | |
1350 | ||
b4161d10 JH |
1351 | DEBUG(D_tls) debug_printf("Dane add-tlsa: usage %u sel %u mdname \"%s\"\n", |
1352 | usage, selector, mdname); | |
6634ac8d | 1353 | |
880a1e77 JH |
1354 | if(dane_idx < 0 || !(dane = SSL_get_ex_data(ssl, dane_idx))) |
1355 | { | |
aaba7d03 | 1356 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_INIT); |
880a1e77 JH |
1357 | return -1; |
1358 | } | |
1359 | ||
aaba7d03 | 1360 | if (usage > DANESSL_USAGE_LAST) |
880a1e77 | 1361 | { |
aaba7d03 | 1362 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_USAGE); |
880a1e77 JH |
1363 | return 0; |
1364 | } | |
aaba7d03 | 1365 | if (selector > DANESSL_SELECTOR_LAST) |
880a1e77 | 1366 | { |
aaba7d03 | 1367 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_SELECTOR); |
880a1e77 JH |
1368 | return 0; |
1369 | } | |
1370 | ||
aaba7d03 VD |
1371 | /* Support built-in standard one-digit mtypes */ |
1372 | if (mdname && *mdname && mdname[1] == '\0') | |
1373 | switch (*mdname - '0') | |
1374 | { | |
1375 | case DANESSL_MATCHING_FULL: mdname = 0; break; | |
1376 | case DANESSL_MATCHING_2256: mdname = "sha256"; break; | |
1377 | case DANESSL_MATCHING_2512: mdname = "sha512"; break; | |
1378 | } | |
1379 | if (mdname && *mdname && (md = EVP_get_digestbyname(mdname)) == 0) | |
1380 | { | |
1381 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_DIGEST); | |
1382 | return 0; | |
1383 | } | |
1384 | if (mdname && *mdname && dlen != EVP_MD_size(md)) | |
1385 | { | |
1386 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_DATA_LENGTH); | |
1387 | return 0; | |
1388 | } | |
1389 | if (!data) | |
1390 | { | |
1391 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_NULL_DATA); | |
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | /* | |
1396 | * Full Certificate or Public Key when NULL or empty digest name | |
1397 | */ | |
1398 | if (!mdname || !*mdname) | |
1399 | { | |
1400 | X509 *x = 0; | |
1401 | EVP_PKEY *k = 0; | |
1402 | const unsigned char *p = data; | |
e682570f TL |
1403 | |
1404 | #define xklistinit(lvar, ltype, var, freeFunc) do { \ | |
aaba7d03 VD |
1405 | (lvar) = (ltype) OPENSSL_malloc(sizeof(*(lvar))); \ |
1406 | if ((lvar) == 0) { \ | |
1407 | DANEerr(DANESSL_F_ADD_TLSA, ERR_R_MALLOC_FAILURE); \ | |
1408 | freeFunc((var)); \ | |
1409 | return 0; \ | |
1410 | } \ | |
1411 | (lvar)->next = 0; \ | |
1412 | lvar->value = var; \ | |
1413 | } while (0) | |
e682570f | 1414 | #define xkfreeret(ret) do { \ |
aaba7d03 VD |
1415 | if (xlist) list_free(xlist, cert_free); \ |
1416 | if (klist) list_free(klist, pkey_free); \ | |
1417 | return (ret); \ | |
1418 | } while (0) | |
880a1e77 | 1419 | |
aaba7d03 | 1420 | switch (selector) |
880a1e77 | 1421 | { |
aaba7d03 VD |
1422 | case DANESSL_SELECTOR_CERT: |
1423 | if (!d2i_X509(&x, &p, dlen) || dlen != p - data) | |
880a1e77 JH |
1424 | { |
1425 | if (x) | |
aaba7d03 VD |
1426 | X509_free(x); |
1427 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_CERT); | |
880a1e77 JH |
1428 | return 0; |
1429 | } | |
1430 | k = X509_get_pubkey(x); | |
1431 | EVP_PKEY_free(k); | |
aaba7d03 | 1432 | if (k == 0) |
880a1e77 JH |
1433 | { |
1434 | X509_free(x); | |
aaba7d03 | 1435 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_CERT_PKEY); |
880a1e77 JH |
1436 | return 0; |
1437 | } | |
aaba7d03 | 1438 | if (usage == DANESSL_USAGE_DANE_TA) |
880a1e77 JH |
1439 | xklistinit(xlist, dane_cert_list, x, X509_free); |
1440 | break; | |
1441 | ||
aaba7d03 VD |
1442 | case DANESSL_SELECTOR_SPKI: |
1443 | if (!d2i_PUBKEY(&k, &p, dlen) || dlen != p - data) | |
880a1e77 | 1444 | { |
aaba7d03 | 1445 | if (k) |
880a1e77 | 1446 | EVP_PKEY_free(k); |
aaba7d03 VD |
1447 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_PKEY); |
1448 | return 0; | |
880a1e77 | 1449 | } |
aaba7d03 | 1450 | if (usage == DANESSL_USAGE_DANE_TA) |
880a1e77 JH |
1451 | xklistinit(klist, dane_pkey_list, k, EVP_PKEY_free); |
1452 | break; | |
e682570f | 1453 | } |
880a1e77 JH |
1454 | } |
1455 | ||
1456 | /* Find insertion point and don't add duplicate elements. */ | |
aaba7d03 VD |
1457 | for (s = dane->selectors[usage]; s; s = s->next) |
1458 | if (s->value->selector == selector) | |
1459 | { | |
1460 | for (m = s->value->mtype; m; m = m->next) | |
1461 | if (m->value->md == md) | |
1462 | { | |
1463 | for (d = m->value->data; d; d = d->next) | |
1464 | if ( d->value->datalen == dlen | |
1465 | && memcmp(d->value->data, data, dlen) == 0) | |
880a1e77 | 1466 | xkfreeret(1); |
aaba7d03 VD |
1467 | break; |
1468 | } | |
1469 | break; | |
1470 | } | |
880a1e77 | 1471 | |
aaba7d03 | 1472 | if ((d = (dane_data_list) list_alloc(sizeof(*d->value) + dlen)) == 0) |
880a1e77 JH |
1473 | xkfreeret(0); |
1474 | d->value->datalen = dlen; | |
1475 | memcpy(d->value->data, data, dlen); | |
aaba7d03 | 1476 | if (!m) |
880a1e77 | 1477 | { |
aaba7d03 | 1478 | if ((m = (dane_mtype_list) list_alloc(sizeof(*m->value))) == 0) |
880a1e77 | 1479 | { |
3376de6c | 1480 | list_free(d, ossl_free); |
880a1e77 | 1481 | xkfreeret(0); |
e682570f | 1482 | } |
880a1e77 | 1483 | m->value->data = 0; |
aaba7d03 | 1484 | if ((m->value->md = md) != 0) |
880a1e77 | 1485 | m->value->mdlen = dlen; |
aaba7d03 | 1486 | if (!s) |
880a1e77 | 1487 | { |
aaba7d03 | 1488 | if ((s = (dane_selector_list) list_alloc(sizeof(*s->value))) == 0) |
880a1e77 JH |
1489 | { |
1490 | list_free(m, dane_mtype_free); | |
1491 | xkfreeret(0); | |
1492 | } | |
1493 | s->value->mtype = 0; | |
1494 | s->value->selector = selector; | |
1495 | LINSERT(dane->selectors[usage], s); | |
1496 | } | |
1497 | LINSERT(s->value->mtype, m); | |
1498 | } | |
1499 | LINSERT(m->value->data, d); | |
1500 | ||
aaba7d03 | 1501 | if (xlist) |
880a1e77 | 1502 | LINSERT(dane->certs, xlist); |
aaba7d03 | 1503 | else if (klist) |
880a1e77 JH |
1504 | LINSERT(dane->pkeys, klist); |
1505 | ++dane->count; | |
1506 | return 1; | |
e682570f TL |
1507 | } |
1508 | ||
946ecbe0 JH |
1509 | |
1510 | ||
1511 | ||
1512 | /* | |
1513 | Call this once we have an ssl connection handle but before | |
1514 | making the TLS connection. | |
1515 | ||
1516 | => In tls_client_start() after the call to SSL_new() | |
1517 | and before the call to SSL_connect(). Exactly where | |
1518 | probably does not matter. | |
1519 | We probably want to keep our existing SNI handling; | |
1520 | call this with NULL. | |
1521 | ||
1522 | Arguments: | |
1523 | ssl Connection handle | |
1524 | sni_domain Optional peer server name | |
868f5672 | 1525 | hostnames list of names to chack against peer cert |
946ecbe0 JH |
1526 | |
1527 | Return | |
1528 | -1 on fatal error | |
1529 | 0 nonfatal error | |
1530 | 1 success | |
1531 | */ | |
1532 | ||
880a1e77 JH |
1533 | int |
1534 | DANESSL_init(SSL *ssl, const char *sni_domain, const char **hostnames) | |
e682570f | 1535 | { |
880a1e77 JH |
1536 | ssl_dane *dane; |
1537 | int i; | |
e682570f | 1538 | |
aaba7d03 VD |
1539 | DEBUG(D_tls) debug_printf("Dane ssl_init\n"); |
1540 | if (dane_idx < 0) | |
880a1e77 | 1541 | { |
aaba7d03 | 1542 | DANEerr(DANESSL_F_INIT, DANESSL_R_LIBRARY_INIT); |
880a1e77 JH |
1543 | return -1; |
1544 | } | |
e682570f | 1545 | |
aaba7d03 VD |
1546 | if (sni_domain && !SSL_set_tlsext_host_name(ssl, sni_domain)) |
1547 | return 0; | |
e682570f | 1548 | |
aaba7d03 | 1549 | if ((dane = (ssl_dane *) OPENSSL_malloc(sizeof(ssl_dane))) == 0) |
880a1e77 | 1550 | { |
aaba7d03 | 1551 | DANEerr(DANESSL_F_INIT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1552 | return 0; |
1553 | } | |
aaba7d03 | 1554 | if (!SSL_set_ex_data(ssl, dane_idx, dane)) |
880a1e77 | 1555 | { |
aaba7d03 | 1556 | DANEerr(DANESSL_F_INIT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1557 | OPENSSL_free(dane); |
1558 | return 0; | |
1559 | } | |
1560 | ||
6634ac8d JH |
1561 | dane->verify = 0; |
1562 | dane->hosts = 0; | |
1563 | dane->thost = 0; | |
880a1e77 JH |
1564 | dane->pkeys = 0; |
1565 | dane->certs = 0; | |
1566 | dane->chain = 0; | |
aaba7d03 | 1567 | dane->match = 0; |
880a1e77 JH |
1568 | dane->roots = 0; |
1569 | dane->depth = -1; | |
aaba7d03 VD |
1570 | dane->mhost = 0; /* Future SSL control interface */ |
1571 | dane->mdpth = 0; /* Future SSL control interface */ | |
1572 | dane->multi = 0; /* Future SSL control interface */ | |
880a1e77 | 1573 | dane->count = 0; |
aaba7d03 | 1574 | dane->hosts = 0; |
880a1e77 | 1575 | |
aaba7d03 VD |
1576 | for (i = 0; i <= DANESSL_USAGE_LAST; ++i) |
1577 | dane->selectors[i] = 0; | |
880a1e77 | 1578 | |
aaba7d03 | 1579 | if (hostnames && (dane->hosts = host_list_init(hostnames)) == 0) |
880a1e77 | 1580 | { |
aaba7d03 | 1581 | DANEerr(DANESSL_F_INIT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1582 | DANESSL_cleanup(ssl); |
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | return 1; | |
e682570f TL |
1587 | } |
1588 | ||
946ecbe0 JH |
1589 | |
1590 | /* | |
1591 | ||
1592 | Call this once we have a context to work with, but | |
1593 | before DANESSL_init() | |
1594 | ||
1595 | => in tls_client_start(), after tls_init() call gives us the ctx, | |
1596 | if we decide we want to (policy) and can (TLSA records available) | |
1597 | replacing (? what about fallback) everything from testing tls_verify_hosts | |
1598 | down to just before calling SSL_new() for the conn handle. | |
1599 | ||
1600 | Arguments | |
1601 | ctx SSL context | |
1602 | ||
1603 | Return | |
1604 | -1 Error | |
1605 | 1 Success | |
1606 | */ | |
1607 | ||
880a1e77 JH |
1608 | int |
1609 | DANESSL_CTX_init(SSL_CTX *ctx) | |
e682570f | 1610 | { |
6634ac8d | 1611 | DEBUG(D_tls) debug_printf("Dane ctx-init\n"); |
aaba7d03 | 1612 | if (dane_idx >= 0) |
880a1e77 JH |
1613 | { |
1614 | SSL_CTX_set_cert_verify_callback(ctx, verify_cert, 0); | |
1615 | return 1; | |
1616 | } | |
aaba7d03 | 1617 | DANEerr(DANESSL_F_CTX_INIT, DANESSL_R_LIBRARY_INIT); |
880a1e77 | 1618 | return -1; |
e682570f TL |
1619 | } |
1620 | ||
880a1e77 JH |
1621 | static void |
1622 | dane_init(void) | |
e682570f | 1623 | { |
880a1e77 JH |
1624 | /* |
1625 | * Store library id in zeroth function slot, used to locate the library | |
1626 | * name. This must be done before we load the error strings. | |
1627 | */ | |
3376de6c JH |
1628 | err_lib_dane = ERR_get_next_error_library(); |
1629 | ||
e682570f | 1630 | #ifndef OPENSSL_NO_ERR |
3376de6c JH |
1631 | if (err_lib_dane > 0) |
1632 | { | |
1633 | dane_str_functs[0].error |= ERR_PACK(err_lib_dane, 0, 0); | |
1634 | ERR_load_strings(err_lib_dane, dane_str_functs); | |
1635 | ERR_load_strings(err_lib_dane, dane_str_reasons); | |
1636 | } | |
e682570f TL |
1637 | #endif |
1638 | ||
880a1e77 JH |
1639 | /* |
1640 | * Register SHA-2 digests, if implemented and not already registered. | |
1641 | */ | |
e682570f | 1642 | #if defined(LN_sha256) && defined(NID_sha256) && !defined(OPENSSL_NO_SHA256) |
aaba7d03 VD |
1643 | if (!EVP_get_digestbyname(LN_sha224)) EVP_add_digest(EVP_sha224()); |
1644 | if (!EVP_get_digestbyname(LN_sha256)) EVP_add_digest(EVP_sha256()); | |
e682570f TL |
1645 | #endif |
1646 | #if defined(LN_sha512) && defined(NID_sha512) && !defined(OPENSSL_NO_SHA512) | |
aaba7d03 VD |
1647 | if (!EVP_get_digestbyname(LN_sha384)) EVP_add_digest(EVP_sha384()); |
1648 | if (!EVP_get_digestbyname(LN_sha512)) EVP_add_digest(EVP_sha512()); | |
e682570f TL |
1649 | #endif |
1650 | ||
880a1e77 JH |
1651 | /* |
1652 | * Register an SSL index for the connection-specific ssl_dane structure. | |
1653 | * Using a separate index makes it possible to add DANE support to | |
1654 | * existing OpenSSL releases that don't have a suitable pointer in the | |
1655 | * SSL structure. | |
1656 | */ | |
1657 | dane_idx = SSL_get_ex_new_index(0, 0, 0, 0, 0); | |
e682570f TL |
1658 | } |
1659 | ||
946ecbe0 | 1660 | |
3376de6c JH |
1661 | #if OPENSSL_VERSION_NUMBER < 0x10100000L |
1662 | static void | |
1663 | run_once(volatile int * once, void (*init)(void)) | |
1664 | { | |
1665 | int wlock = 0; | |
1666 | ||
1667 | CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); | |
1668 | if (!*once) | |
1669 | { | |
1670 | CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); | |
1671 | CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); | |
1672 | wlock = 1; | |
1673 | if (!*once) | |
1674 | { | |
1675 | *once = 1; | |
1676 | init(); | |
1677 | } | |
1678 | } | |
1679 | if (wlock) | |
1680 | CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); | |
1681 | else | |
1682 | CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); | |
1683 | } | |
1684 | #endif | |
1685 | ||
1686 | ||
946ecbe0 JH |
1687 | |
1688 | /* | |
1689 | ||
1690 | Call this once. Probably early in startup will do; may need | |
1691 | to be after SSL library init. | |
1692 | ||
043b1248 JH |
1693 | => put after call to tls_init() for now |
1694 | ||
1695 | Return | |
1696 | 1 Success | |
1697 | 0 Fail | |
946ecbe0 JH |
1698 | */ |
1699 | ||
880a1e77 JH |
1700 | int |
1701 | DANESSL_library_init(void) | |
e682570f | 1702 | { |
3376de6c JH |
1703 | static CRYPTO_ONCE once = CRYPTO_ONCE_STATIC_INIT; |
1704 | ||
6634ac8d | 1705 | DEBUG(D_tls) debug_printf("Dane lib-init\n"); |
3376de6c | 1706 | (void) CRYPTO_THREAD_run_once(&once, dane_init); |
e682570f TL |
1707 | |
1708 | #if defined(LN_sha256) | |
880a1e77 | 1709 | /* No DANE without SHA256 support */ |
aaba7d03 | 1710 | if (dane_idx >= 0 && EVP_get_digestbyname(LN_sha256) != 0) |
880a1e77 | 1711 | return 1; |
e682570f | 1712 | #endif |
aaba7d03 | 1713 | DANEerr(DANESSL_F_LIBRARY_INIT, DANESSL_R_SUPPORT); |
880a1e77 | 1714 | return 0; |
e682570f TL |
1715 | } |
1716 | ||
946ecbe0 | 1717 | |
880a1e77 JH |
1718 | /* vi: aw ai sw=2 |
1719 | */ |