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