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