Commit | Line | Data |
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aaba7d03 VD |
1 | /* |
2 | * Author: Viktor Dukhovni | |
3 | * License: THIS CODE IS IN THE PUBLIC DOMAIN. | |
80fea873 | 4 | * |
f9ba5e22 | 5 | * Copyright (c) The Exim Maintainers 2014 - 2018 |
aaba7d03 | 6 | */ |
e682570f TL |
7 | #include <stdio.h> |
8 | #include <string.h> | |
9 | #include <stdint.h> | |
10 | ||
11 | #include <openssl/opensslv.h> | |
12 | #include <openssl/err.h> | |
13 | #include <openssl/crypto.h> | |
14 | #include <openssl/safestack.h> | |
15 | #include <openssl/objects.h> | |
16 | #include <openssl/x509.h> | |
17 | #include <openssl/x509v3.h> | |
18 | #include <openssl/evp.h> | |
aaba7d03 | 19 | #include <openssl/bn.h> |
e682570f TL |
20 | |
21 | #if OPENSSL_VERSION_NUMBER < 0x1000000fL | |
880a1e77 | 22 | # error "OpenSSL 1.0.0 or higher required" |
3376de6c | 23 | #endif |
e682570f | 24 | |
ae98657d JH |
25 | #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER) |
26 | # define X509_up_ref(x) CRYPTO_add(&((x)->references), 1, CRYPTO_LOCK_X509) | |
aaba7d03 | 27 | #endif |
278293d3 | 28 | #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER) |
c8dfb21d JH |
29 | # define EXIM_HAVE_ASN1_MACROS |
30 | # define EXIM_OPAQUE_X509 | |
e3555426 JH |
31 | #else |
32 | # define X509_STORE_CTX_get_verify(ctx) (ctx)->verify | |
33 | # define X509_STORE_CTX_get_verify_cb(ctx) (ctx)->verify_cb | |
34 | # define X509_STORE_CTX_get0_cert(ctx) (ctx)->cert | |
35 | # define X509_STORE_CTX_get0_chain(ctx) (ctx)->chain | |
36 | # define X509_STORE_CTX_get0_untrusted(ctx) (ctx)->untrusted | |
37 | ||
38 | # define X509_STORE_CTX_set_verify(ctx, verify_chain) (ctx)->verify = (verify_chain) | |
39 | # define X509_STORE_CTX_set0_verified_chain(ctx, sk) (ctx)->chain = (sk) | |
40 | # define X509_STORE_CTX_set_error_depth(ctx, val) (ctx)->error_depth = (val) | |
41 | # define X509_STORE_CTX_set_current_cert(ctx, cert) (ctx)->current_cert = (cert) | |
3376de6c JH |
42 | |
43 | # define ASN1_STRING_get0_data ASN1_STRING_data | |
44 | # define X509_getm_notBefore X509_get_notBefore | |
45 | # define X509_getm_notAfter X509_get_notAfter | |
46 | ||
47 | # define CRYPTO_ONCE_STATIC_INIT 0 | |
48 | # define CRYPTO_THREAD_run_once run_once | |
49 | typedef int CRYPTO_ONCE; | |
c8dfb21d JH |
50 | #endif |
51 | ||
aaba7d03 | 52 | |
e682570f TL |
53 | #include "danessl.h" |
54 | ||
aaba7d03 VD |
55 | #define DANESSL_F_ADD_SKID 100 |
56 | #define DANESSL_F_ADD_TLSA 101 | |
57 | #define DANESSL_F_CHECK_END_ENTITY 102 | |
58 | #define DANESSL_F_CTX_INIT 103 | |
59 | #define DANESSL_F_GROW_CHAIN 104 | |
60 | #define DANESSL_F_INIT 105 | |
61 | #define DANESSL_F_LIBRARY_INIT 106 | |
62 | #define DANESSL_F_LIST_ALLOC 107 | |
63 | #define DANESSL_F_MATCH 108 | |
64 | #define DANESSL_F_PUSH_EXT 109 | |
65 | #define DANESSL_F_SET_TRUST_ANCHOR 110 | |
66 | #define DANESSL_F_VERIFY_CERT 111 | |
67 | #define DANESSL_F_WRAP_CERT 112 | |
3376de6c | 68 | #define DANESSL_F_DANESSL_VERIFY_CHAIN 113 |
aaba7d03 VD |
69 | |
70 | #define DANESSL_R_BAD_CERT 100 | |
71 | #define DANESSL_R_BAD_CERT_PKEY 101 | |
72 | #define DANESSL_R_BAD_DATA_LENGTH 102 | |
73 | #define DANESSL_R_BAD_DIGEST 103 | |
74 | #define DANESSL_R_BAD_NULL_DATA 104 | |
75 | #define DANESSL_R_BAD_PKEY 105 | |
76 | #define DANESSL_R_BAD_SELECTOR 106 | |
77 | #define DANESSL_R_BAD_USAGE 107 | |
78 | #define DANESSL_R_INIT 108 | |
79 | #define DANESSL_R_LIBRARY_INIT 109 | |
80 | #define DANESSL_R_NOSIGN_KEY 110 | |
81 | #define DANESSL_R_SCTX_INIT 111 | |
82 | #define DANESSL_R_SUPPORT 112 | |
e682570f TL |
83 | |
84 | #ifndef OPENSSL_NO_ERR | |
aaba7d03 VD |
85 | #define DANESSL_F_PLACEHOLDER 0 /* FIRST! Value TBD */ |
86 | static ERR_STRING_DATA dane_str_functs[] = { | |
f2ed27cf | 87 | /* error string */ |
aaba7d03 VD |
88 | {DANESSL_F_PLACEHOLDER, "DANE library"}, /* FIRST!!! */ |
89 | {DANESSL_F_ADD_SKID, "add_skid"}, | |
90 | {DANESSL_F_ADD_TLSA, "DANESSL_add_tlsa"}, | |
91 | {DANESSL_F_CHECK_END_ENTITY, "check_end_entity"}, | |
92 | {DANESSL_F_CTX_INIT, "DANESSL_CTX_init"}, | |
93 | {DANESSL_F_GROW_CHAIN, "grow_chain"}, | |
94 | {DANESSL_F_INIT, "DANESSL_init"}, | |
95 | {DANESSL_F_LIBRARY_INIT, "DANESSL_library_init"}, | |
96 | {DANESSL_F_LIST_ALLOC, "list_alloc"}, | |
97 | {DANESSL_F_MATCH, "match"}, | |
98 | {DANESSL_F_PUSH_EXT, "push_ext"}, | |
99 | {DANESSL_F_SET_TRUST_ANCHOR, "set_trust_anchor"}, | |
100 | {DANESSL_F_VERIFY_CERT, "verify_cert"}, | |
101 | {DANESSL_F_WRAP_CERT, "wrap_cert"}, | |
102 | {0, NULL} | |
e682570f | 103 | }; |
aaba7d03 | 104 | static ERR_STRING_DATA dane_str_reasons[] = { |
f2ed27cf | 105 | /* error string */ |
aaba7d03 VD |
106 | {DANESSL_R_BAD_CERT, "Bad TLSA record certificate"}, |
107 | {DANESSL_R_BAD_CERT_PKEY, "Bad TLSA record certificate public key"}, | |
108 | {DANESSL_R_BAD_DATA_LENGTH, "Bad TLSA record digest length"}, | |
109 | {DANESSL_R_BAD_DIGEST, "Bad TLSA record digest"}, | |
110 | {DANESSL_R_BAD_NULL_DATA, "Bad TLSA record null data"}, | |
111 | {DANESSL_R_BAD_PKEY, "Bad TLSA record public key"}, | |
112 | {DANESSL_R_BAD_SELECTOR, "Bad TLSA record selector"}, | |
113 | {DANESSL_R_BAD_USAGE, "Bad TLSA record usage"}, | |
114 | {DANESSL_R_INIT, "DANESSL_init() required"}, | |
115 | {DANESSL_R_LIBRARY_INIT, "DANESSL_library_init() required"}, | |
116 | {DANESSL_R_NOSIGN_KEY, "Certificate usage 2 requires EC support"}, | |
117 | {DANESSL_R_SCTX_INIT, "DANESSL_CTX_init() required"}, | |
118 | {DANESSL_R_SUPPORT, "DANE library features not supported"}, | |
119 | {0, NULL} | |
e682570f | 120 | }; |
aaba7d03 | 121 | #endif |
e682570f TL |
122 | |
123 | #define DANEerr(f, r) ERR_PUT_error(err_lib_dane, (f), (r), __FILE__, __LINE__) | |
124 | ||
125 | static int err_lib_dane = -1; | |
126 | static int dane_idx = -1; | |
127 | ||
128 | #ifdef X509_V_FLAG_PARTIAL_CHAIN /* OpenSSL >= 1.0.2 */ | |
129 | static int wrap_to_root = 0; | |
130 | #else | |
131 | static int wrap_to_root = 1; | |
132 | #endif | |
133 | ||
134 | static void (*cert_free)(void *) = (void (*)(void *)) X509_free; | |
135 | static void (*pkey_free)(void *) = (void (*)(void *)) EVP_PKEY_free; | |
136 | ||
880a1e77 JH |
137 | typedef struct dane_list |
138 | { | |
e682570f TL |
139 | struct dane_list *next; |
140 | void *value; | |
141 | } *dane_list; | |
142 | ||
143 | #define LINSERT(h, e) do { (e)->next = (h); (h) = (e); } while (0) | |
144 | ||
880a1e77 JH |
145 | typedef struct dane_host_list |
146 | { | |
147 | struct dane_host_list *next; | |
e682570f | 148 | char *value; |
880a1e77 | 149 | } *dane_host_list; |
e682570f | 150 | |
880a1e77 JH |
151 | typedef struct dane_data |
152 | { | |
e682570f TL |
153 | size_t datalen; |
154 | unsigned char data[0]; | |
155 | } *dane_data; | |
156 | ||
880a1e77 JH |
157 | typedef struct dane_data_list |
158 | { | |
159 | struct dane_data_list *next; | |
e682570f | 160 | dane_data value; |
880a1e77 | 161 | } *dane_data_list; |
e682570f | 162 | |
880a1e77 JH |
163 | typedef struct dane_mtype |
164 | { | |
e682570f TL |
165 | int mdlen; |
166 | const EVP_MD *md; | |
880a1e77 | 167 | dane_data_list data; |
e682570f TL |
168 | } *dane_mtype; |
169 | ||
880a1e77 JH |
170 | typedef struct dane_mtype_list |
171 | { | |
172 | struct dane_mtype_list *next; | |
e682570f | 173 | dane_mtype value; |
880a1e77 | 174 | } *dane_mtype_list; |
e682570f | 175 | |
880a1e77 JH |
176 | typedef struct dane_selector |
177 | { | |
e682570f | 178 | uint8_t selector; |
880a1e77 | 179 | dane_mtype_list mtype; |
e682570f TL |
180 | } *dane_selector; |
181 | ||
880a1e77 JH |
182 | typedef struct dane_selector_list |
183 | { | |
184 | struct dane_selector_list *next; | |
e682570f | 185 | dane_selector value; |
880a1e77 | 186 | } *dane_selector_list; |
e682570f | 187 | |
880a1e77 JH |
188 | typedef struct dane_pkey_list |
189 | { | |
190 | struct dane_pkey_list *next; | |
e682570f | 191 | EVP_PKEY *value; |
880a1e77 | 192 | } *dane_pkey_list; |
e682570f | 193 | |
880a1e77 JH |
194 | typedef struct dane_cert_list |
195 | { | |
196 | struct dane_cert_list *next; | |
e682570f | 197 | X509 *value; |
880a1e77 | 198 | } *dane_cert_list; |
e682570f | 199 | |
880a1e77 JH |
200 | typedef struct ssl_dane |
201 | { | |
e682570f TL |
202 | int (*verify)(X509_STORE_CTX *); |
203 | STACK_OF(X509) *roots; | |
204 | STACK_OF(X509) *chain; | |
aaba7d03 VD |
205 | X509 *match; /* Matched cert */ |
206 | const char *thost; /* TLSA base domain */ | |
207 | char *mhost; /* Matched peer name */ | |
880a1e77 JH |
208 | dane_pkey_list pkeys; |
209 | dane_cert_list certs; | |
210 | dane_host_list hosts; | |
aaba7d03 | 211 | dane_selector_list selectors[DANESSL_USAGE_LAST + 1]; |
e682570f | 212 | int depth; |
aaba7d03 VD |
213 | int mdpth; /* Depth of matched cert */ |
214 | int multi; /* Multi-label wildcards? */ | |
215 | int count; /* Number of TLSA records */ | |
880a1e77 | 216 | } ssl_dane; |
e682570f TL |
217 | |
218 | #ifndef X509_V_ERR_HOSTNAME_MISMATCH | |
880a1e77 | 219 | # define X509_V_ERR_HOSTNAME_MISMATCH X509_V_ERR_APPLICATION_VERIFICATION |
e682570f TL |
220 | #endif |
221 | ||
f2f2c91b JH |
222 | |
223 | ||
880a1e77 JH |
224 | static int |
225 | match(dane_selector_list slist, X509 *cert, int depth) | |
e682570f | 226 | { |
880a1e77 | 227 | int matched; |
e682570f | 228 | |
880a1e77 JH |
229 | /* |
230 | * Note, set_trust_anchor() needs to know whether the match was for a | |
231 | * pkey digest or a certificate digest. We return MATCHED_PKEY or | |
232 | * MATCHED_CERT accordingly. | |
233 | */ | |
aaba7d03 VD |
234 | #define MATCHED_CERT (DANESSL_SELECTOR_CERT + 1) |
235 | #define MATCHED_PKEY (DANESSL_SELECTOR_SPKI + 1) | |
e682570f | 236 | |
880a1e77 JH |
237 | /* |
238 | * Loop over each selector, mtype, and associated data element looking | |
239 | * for a match. | |
240 | */ | |
aaba7d03 | 241 | for (matched = 0; !matched && slist; slist = slist->next) |
880a1e77 | 242 | { |
880a1e77 | 243 | unsigned char mdbuf[EVP_MAX_MD_SIZE]; |
85098ee7 | 244 | unsigned char *buf = NULL; |
880a1e77 | 245 | unsigned char *buf2; |
85098ee7 | 246 | unsigned int len = 0; |
880a1e77 JH |
247 | |
248 | /* | |
249 | * Extract ASN.1 DER form of certificate or public key. | |
250 | */ | |
251 | switch(slist->value->selector) | |
252 | { | |
aaba7d03 | 253 | case DANESSL_SELECTOR_CERT: |
880a1e77 | 254 | len = i2d_X509(cert, NULL); |
5903c6ff | 255 | buf2 = buf = US OPENSSL_malloc(len); |
880a1e77 JH |
256 | if(buf) i2d_X509(cert, &buf2); |
257 | break; | |
aaba7d03 | 258 | case DANESSL_SELECTOR_SPKI: |
880a1e77 | 259 | len = i2d_X509_PUBKEY(X509_get_X509_PUBKEY(cert), NULL); |
5903c6ff | 260 | buf2 = buf = US OPENSSL_malloc(len); |
880a1e77 JH |
261 | if(buf) i2d_X509_PUBKEY(X509_get_X509_PUBKEY(cert), &buf2); |
262 | break; | |
263 | } | |
264 | ||
aaba7d03 | 265 | if (!buf) |
880a1e77 | 266 | { |
aaba7d03 | 267 | DANEerr(DANESSL_F_MATCH, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
268 | return 0; |
269 | } | |
270 | OPENSSL_assert(buf2 - buf == len); | |
271 | ||
272 | /* | |
273 | * Loop over each mtype and data element | |
274 | */ | |
d7978c0f | 275 | for (dane_mtype_list m = slist->value->mtype; !matched && m; m = m->next) |
880a1e77 | 276 | { |
880a1e77 JH |
277 | unsigned char *cmpbuf = buf; |
278 | unsigned int cmplen = len; | |
279 | ||
e682570f | 280 | /* |
880a1e77 JH |
281 | * If it is a digest, compute the corresponding digest of the |
282 | * DER data for comparison, otherwise, use the full object. | |
e682570f | 283 | */ |
aaba7d03 | 284 | if (m->value->md) |
880a1e77 JH |
285 | { |
286 | cmpbuf = mdbuf; | |
aaba7d03 | 287 | if (!EVP_Digest(buf, len, cmpbuf, &cmplen, m->value->md, 0)) |
880a1e77 JH |
288 | matched = -1; |
289 | } | |
d7978c0f | 290 | for (dane_data_list d = m->value->data; !matched && d; d = d->next) |
aaba7d03 VD |
291 | if ( cmplen == d->value->datalen |
292 | && memcmp(cmpbuf, d->value->data, cmplen) == 0) | |
880a1e77 | 293 | matched = slist->value->selector + 1; |
e682570f TL |
294 | } |
295 | ||
880a1e77 JH |
296 | OPENSSL_free(buf); |
297 | } | |
e682570f | 298 | |
880a1e77 | 299 | return matched; |
e682570f TL |
300 | } |
301 | ||
880a1e77 JH |
302 | static int |
303 | push_ext(X509 *cert, X509_EXTENSION *ext) | |
e682570f | 304 | { |
3376de6c JH |
305 | if (ext) |
306 | { | |
307 | if (X509_add_ext(cert, ext, -1)) | |
308 | return 1; | |
309 | X509_EXTENSION_free(ext); | |
310 | } | |
311 | DANEerr(DANESSL_F_PUSH_EXT, ERR_R_MALLOC_FAILURE); | |
312 | return 0; | |
e682570f TL |
313 | } |
314 | ||
880a1e77 JH |
315 | static int |
316 | add_ext(X509 *issuer, X509 *subject, int ext_nid, char *ext_val) | |
e682570f | 317 | { |
880a1e77 | 318 | X509V3_CTX v3ctx; |
e682570f | 319 | |
880a1e77 JH |
320 | X509V3_set_ctx(&v3ctx, issuer, subject, 0, 0, 0); |
321 | return push_ext(subject, X509V3_EXT_conf_nid(0, &v3ctx, ext_nid, ext_val)); | |
e682570f TL |
322 | } |
323 | ||
880a1e77 JH |
324 | static int |
325 | set_serial(X509 *cert, AUTHORITY_KEYID *akid, X509 *subject) | |
e682570f | 326 | { |
880a1e77 JH |
327 | int ret = 0; |
328 | BIGNUM *bn; | |
329 | ||
aaba7d03 | 330 | if (akid && akid->serial) |
880a1e77 JH |
331 | return (X509_set_serialNumber(cert, akid->serial)); |
332 | ||
333 | /* | |
334 | * Add one to subject's serial to avoid collisions between TA serial and | |
335 | * serial of signing root. | |
336 | */ | |
aaba7d03 VD |
337 | if ( (bn = ASN1_INTEGER_to_BN(X509_get_serialNumber(subject), 0)) != 0 |
338 | && BN_add_word(bn, 1) | |
339 | && BN_to_ASN1_INTEGER(bn, X509_get_serialNumber(cert))) | |
880a1e77 JH |
340 | ret = 1; |
341 | ||
aaba7d03 | 342 | if (bn) |
880a1e77 JH |
343 | BN_free(bn); |
344 | return ret; | |
345 | } | |
e682570f | 346 | |
880a1e77 JH |
347 | static int |
348 | add_akid(X509 *cert, AUTHORITY_KEYID *akid) | |
349 | { | |
350 | int nid = NID_authority_key_identifier; | |
3376de6c | 351 | ASN1_OCTET_STRING *id; |
880a1e77 JH |
352 | unsigned char c = 0; |
353 | int ret = 0; | |
354 | ||
355 | /* | |
356 | * 0 will never be our subject keyid from a SHA-1 hash, but it could be | |
357 | * our subject keyid if forced from child's akid. If so, set our | |
358 | * authority keyid to 1. This way we are never self-signed, and thus | |
359 | * exempt from any potential (off by default for now in OpenSSL) | |
360 | * self-signature checks! | |
361 | */ | |
3376de6c JH |
362 | id = akid && akid->keyid ? akid->keyid : 0; |
363 | if (id && ASN1_STRING_length(id) == 1 && *ASN1_STRING_get0_data(id) == c) | |
880a1e77 JH |
364 | c = 1; |
365 | ||
aaba7d03 VD |
366 | if ( (akid = AUTHORITY_KEYID_new()) != 0 |
367 | && (akid->keyid = ASN1_OCTET_STRING_new()) != 0 | |
c8dfb21d JH |
368 | #ifdef EXIM_HAVE_ASN1_MACROS |
369 | && ASN1_OCTET_STRING_set(akid->keyid, (void *) &c, 1) | |
370 | #else | |
aaba7d03 | 371 | && M_ASN1_OCTET_STRING_set(akid->keyid, (void *) &c, 1) |
c8dfb21d | 372 | #endif |
aaba7d03 | 373 | && X509_add1_ext_i2d(cert, nid, akid, 0, X509V3_ADD_APPEND)) |
880a1e77 | 374 | ret = 1; |
aaba7d03 | 375 | if (akid) |
880a1e77 JH |
376 | AUTHORITY_KEYID_free(akid); |
377 | return ret; | |
e682570f TL |
378 | } |
379 | ||
880a1e77 JH |
380 | static int |
381 | add_skid(X509 *cert, AUTHORITY_KEYID *akid) | |
e682570f | 382 | { |
880a1e77 | 383 | int nid = NID_subject_key_identifier; |
e682570f | 384 | |
aaba7d03 | 385 | if (!akid || !akid->keyid) |
880a1e77 JH |
386 | return add_ext(0, cert, nid, "hash"); |
387 | return X509_add1_ext_i2d(cert, nid, akid->keyid, 0, X509V3_ADD_APPEND) > 0; | |
e682570f TL |
388 | } |
389 | ||
880a1e77 JH |
390 | static X509_NAME * |
391 | akid_issuer_name(AUTHORITY_KEYID *akid) | |
e682570f | 392 | { |
aaba7d03 | 393 | if (akid && akid->issuer) |
880a1e77 | 394 | { |
880a1e77 | 395 | GENERAL_NAMES *gens = akid->issuer; |
e682570f | 396 | |
d7978c0f | 397 | for (int i = 0; i < sk_GENERAL_NAME_num(gens); ++i) |
880a1e77 JH |
398 | { |
399 | GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, i); | |
e682570f | 400 | |
aaba7d03 | 401 | if (gn->type == GEN_DIRNAME) |
880a1e77 | 402 | return (gn->d.dirn); |
e682570f | 403 | } |
880a1e77 JH |
404 | } |
405 | return 0; | |
e682570f TL |
406 | } |
407 | ||
880a1e77 | 408 | static int |
4f5830fe | 409 | set_issuer_name(X509 *cert, AUTHORITY_KEYID *akid, X509_NAME *subj) |
e682570f | 410 | { |
880a1e77 JH |
411 | X509_NAME *name = akid_issuer_name(akid); |
412 | ||
413 | /* | |
aded2255 | 414 | * If subject's akid specifies an authority key identifier issuer name, we |
880a1e77 JH |
415 | * must use that. |
416 | */ | |
417 | return X509_set_issuer_name(cert, | |
4f5830fe | 418 | name ? name : subj); |
e682570f TL |
419 | } |
420 | ||
880a1e77 JH |
421 | static int |
422 | grow_chain(ssl_dane *dane, int trusted, X509 *cert) | |
e682570f | 423 | { |
880a1e77 JH |
424 | STACK_OF(X509) **xs = trusted ? &dane->roots : &dane->chain; |
425 | static ASN1_OBJECT *serverAuth = 0; | |
e682570f TL |
426 | |
427 | #define UNTRUSTED 0 | |
428 | #define TRUSTED 1 | |
429 | ||
aaba7d03 VD |
430 | if ( trusted && !serverAuth |
431 | && !(serverAuth = OBJ_nid2obj(NID_server_auth))) | |
880a1e77 | 432 | { |
aaba7d03 | 433 | DANEerr(DANESSL_F_GROW_CHAIN, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
434 | return 0; |
435 | } | |
aaba7d03 | 436 | if (!*xs && !(*xs = sk_X509_new_null())) |
880a1e77 | 437 | { |
aaba7d03 | 438 | DANEerr(DANESSL_F_GROW_CHAIN, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
439 | return 0; |
440 | } | |
441 | ||
aaba7d03 | 442 | if (cert) |
880a1e77 | 443 | { |
aaba7d03 | 444 | if (trusted && !X509_add1_trust_object(cert, serverAuth)) |
880a1e77 | 445 | return 0; |
c8dfb21d JH |
446 | #ifdef EXIM_OPAQUE_X509 |
447 | X509_up_ref(cert); | |
448 | #else | |
880a1e77 | 449 | CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); |
c8dfb21d | 450 | #endif |
880a1e77 JH |
451 | if (!sk_X509_push(*xs, cert)) |
452 | { | |
453 | X509_free(cert); | |
aaba7d03 | 454 | DANEerr(DANESSL_F_GROW_CHAIN, ERR_R_MALLOC_FAILURE); |
880a1e77 | 455 | return 0; |
e682570f | 456 | } |
880a1e77 JH |
457 | } |
458 | return 1; | |
e682570f TL |
459 | } |
460 | ||
880a1e77 JH |
461 | static int |
462 | wrap_issuer(ssl_dane *dane, EVP_PKEY *key, X509 *subject, int depth, int top) | |
e682570f | 463 | { |
880a1e77 JH |
464 | int ret = 1; |
465 | X509 *cert = 0; | |
466 | AUTHORITY_KEYID *akid; | |
467 | X509_NAME *name = X509_get_issuer_name(subject); | |
468 | EVP_PKEY *newkey = key ? key : X509_get_pubkey(subject); | |
e682570f TL |
469 | |
470 | #define WRAP_MID 0 /* Ensure intermediate. */ | |
471 | #define WRAP_TOP 1 /* Ensure self-signed. */ | |
472 | ||
aaba7d03 | 473 | if (!name || !newkey || !(cert = X509_new())) |
880a1e77 JH |
474 | return 0; |
475 | ||
476 | /* | |
477 | * Record the depth of the trust-anchor certificate. | |
478 | */ | |
aaba7d03 | 479 | if (dane->depth < 0) |
880a1e77 JH |
480 | dane->depth = depth + 1; |
481 | ||
482 | /* | |
483 | * XXX: Uncaught error condition: | |
484 | * | |
485 | * The return value is NULL both when the extension is missing, and when | |
486 | * OpenSSL rans out of memory while parsing the extension. | |
487 | */ | |
488 | ERR_clear_error(); | |
489 | akid = X509_get_ext_d2i(subject, NID_authority_key_identifier, 0, 0); | |
490 | /* XXX: Should we peek at the error stack here??? */ | |
491 | ||
492 | /* | |
493 | * If top is true generate a self-issued root CA, otherwise an | |
494 | * intermediate CA and possibly its self-signed issuer. | |
495 | * | |
496 | * CA cert valid for +/- 30 days | |
497 | */ | |
aaba7d03 VD |
498 | if ( !X509_set_version(cert, 2) |
499 | || !set_serial(cert, akid, subject) | |
4f5830fe | 500 | || !set_issuer_name(cert, akid, name) |
3376de6c JH |
501 | || !X509_gmtime_adj(X509_getm_notBefore(cert), -30 * 86400L) |
502 | || !X509_gmtime_adj(X509_getm_notAfter(cert), 30 * 86400L) | |
503 | || !X509_set_subject_name(cert, name) | |
aaba7d03 VD |
504 | || !X509_set_pubkey(cert, newkey) |
505 | || !add_ext(0, cert, NID_basic_constraints, "CA:TRUE") | |
506 | || (!top && !add_akid(cert, akid)) | |
507 | || !add_skid(cert, akid) | |
508 | || ( !top && wrap_to_root | |
509 | && !wrap_issuer(dane, newkey, cert, depth, WRAP_TOP))) | |
880a1e77 JH |
510 | ret = 0; |
511 | ||
aaba7d03 | 512 | if (akid) |
880a1e77 | 513 | AUTHORITY_KEYID_free(akid); |
aaba7d03 | 514 | if (!key) |
880a1e77 | 515 | EVP_PKEY_free(newkey); |
aaba7d03 | 516 | if (ret) |
880a1e77 | 517 | ret = grow_chain(dane, !top && wrap_to_root ? UNTRUSTED : TRUSTED, cert); |
aaba7d03 | 518 | if (cert) |
880a1e77 JH |
519 | X509_free(cert); |
520 | return ret; | |
e682570f TL |
521 | } |
522 | ||
880a1e77 JH |
523 | static int |
524 | wrap_cert(ssl_dane *dane, X509 *tacert, int depth) | |
e682570f | 525 | { |
aaba7d03 | 526 | if (dane->depth < 0) |
880a1e77 JH |
527 | dane->depth = depth + 1; |
528 | ||
529 | /* | |
530 | * If the TA certificate is self-issued, or need not be, use it directly. | |
4c04137d | 531 | * Otherwise, synthesize requisite ancestors. |
880a1e77 | 532 | */ |
aaba7d03 VD |
533 | if ( !wrap_to_root |
534 | || X509_check_issued(tacert, tacert) == X509_V_OK) | |
880a1e77 JH |
535 | return grow_chain(dane, TRUSTED, tacert); |
536 | ||
aaba7d03 | 537 | if (wrap_issuer(dane, 0, tacert, depth, WRAP_MID)) |
880a1e77 JH |
538 | return grow_chain(dane, UNTRUSTED, tacert); |
539 | return 0; | |
e682570f TL |
540 | } |
541 | ||
880a1e77 JH |
542 | static int |
543 | ta_signed(ssl_dane *dane, X509 *cert, int depth) | |
e682570f | 544 | { |
880a1e77 JH |
545 | EVP_PKEY *pk; |
546 | int done = 0; | |
547 | ||
548 | /* | |
549 | * First check whether issued and signed by a TA cert, this is cheaper | |
550 | * than the bare-public key checks below, since we can determine whether | |
551 | * the candidate TA certificate issued the certificate to be checked | |
552 | * first (name comparisons), before we bother with signature checks | |
553 | * (public key operations). | |
554 | */ | |
d7978c0f | 555 | for (dane_cert_list x = dane->certs; !done && x; x = x->next) |
880a1e77 | 556 | { |
aaba7d03 | 557 | if (X509_check_issued(x->value, cert) == X509_V_OK) |
880a1e77 | 558 | { |
aaba7d03 | 559 | if (!(pk = X509_get_pubkey(x->value))) |
880a1e77 JH |
560 | { |
561 | /* | |
562 | * The cert originally contained a valid pkey, which does | |
563 | * not just vanish, so this is most likely a memory error. | |
564 | */ | |
565 | done = -1; | |
566 | break; | |
567 | } | |
568 | /* Check signature, since some other TA may work if not this. */ | |
aaba7d03 | 569 | if (X509_verify(cert, pk) > 0) |
880a1e77 JH |
570 | done = wrap_cert(dane, x->value, depth) ? 1 : -1; |
571 | EVP_PKEY_free(pk); | |
e682570f | 572 | } |
880a1e77 JH |
573 | } |
574 | ||
575 | /* | |
576 | * With bare TA public keys, we can't check whether the trust chain is | |
577 | * issued by the key, but we can determine whether it is signed by the | |
578 | * key, so we go with that. | |
579 | * | |
580 | * Ideally, the corresponding certificate was presented in the chain, and we | |
581 | * matched it by its public key digest one level up. This code is here | |
582 | * to handle adverse conditions imposed by sloppy administrators of | |
583 | * receiving systems with poorly constructed chains. | |
584 | * | |
585 | * We'd like to optimize out keys that should not match when the cert's | |
586 | * authority key id does not match the key id of this key computed via | |
587 | * the RFC keyid algorithm (SHA-1 digest of public key bit-string sans | |
588 | * ASN1 tag and length thus also excluding the unused bits field that is | |
589 | * logically part of the length). However, some CAs have a non-standard | |
590 | * authority keyid, so we lose. Too bad. | |
591 | * | |
592 | * This may push errors onto the stack when the certificate signature is | |
593 | * not of the right type or length, throw these away, | |
594 | */ | |
d7978c0f | 595 | for (dane_pkey_list k = dane->pkeys; !done && k; k = k->next) |
aaba7d03 | 596 | if (X509_verify(cert, k->value) > 0) |
880a1e77 JH |
597 | done = wrap_issuer(dane, k->value, cert, depth, WRAP_MID) ? 1 : -1; |
598 | else | |
599 | ERR_clear_error(); | |
e682570f | 600 | |
880a1e77 | 601 | return done; |
e682570f TL |
602 | } |
603 | ||
880a1e77 JH |
604 | static int |
605 | set_trust_anchor(X509_STORE_CTX *ctx, ssl_dane *dane, X509 *cert) | |
e682570f | 606 | { |
880a1e77 | 607 | int matched = 0; |
880a1e77 JH |
608 | int depth = 0; |
609 | EVP_PKEY *takey; | |
610 | X509 *ca; | |
e3555426 | 611 | STACK_OF(X509) *in = X509_STORE_CTX_get0_untrusted(ctx); |
880a1e77 | 612 | |
aaba7d03 | 613 | if (!grow_chain(dane, UNTRUSTED, 0)) |
880a1e77 JH |
614 | return -1; |
615 | ||
616 | /* | |
617 | * Accept a degenerate case: depth 0 self-signed trust-anchor. | |
618 | */ | |
aaba7d03 | 619 | if (X509_check_issued(cert, cert) == X509_V_OK) |
880a1e77 JH |
620 | { |
621 | dane->depth = 0; | |
aaba7d03 VD |
622 | matched = match(dane->selectors[DANESSL_USAGE_DANE_TA], cert, 0); |
623 | if (matched > 0 && !grow_chain(dane, TRUSTED, cert)) | |
880a1e77 JH |
624 | matched = -1; |
625 | return matched; | |
626 | } | |
627 | ||
628 | /* Make a shallow copy of the input untrusted chain. */ | |
aaba7d03 | 629 | if (!(in = sk_X509_dup(in))) |
880a1e77 | 630 | { |
aaba7d03 | 631 | DANEerr(DANESSL_F_SET_TRUST_ANCHOR, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
632 | return -1; |
633 | } | |
634 | ||
635 | /* | |
636 | * At each iteration we consume the issuer of the current cert. This | |
637 | * reduces the length of the "in" chain by one. If no issuer is found, | |
638 | * we are done. We also stop when a certificate matches a TA in the | |
639 | * peer's TLSA RRset. | |
640 | * | |
641 | * Caller ensures that the initial certificate is not self-signed. | |
642 | */ | |
d7978c0f | 643 | for (int n = sk_X509_num(in); n > 0; --n, ++depth) |
880a1e77 | 644 | { |
d7978c0f | 645 | int i; |
aaba7d03 VD |
646 | for (i = 0; i < n; ++i) |
647 | if (X509_check_issued(sk_X509_value(in, i), cert) == X509_V_OK) | |
880a1e77 JH |
648 | break; |
649 | ||
650 | /* | |
651 | * Final untrusted element with no issuer in the peer's chain, it may | |
652 | * however be signed by a pkey or cert obtained via a TLSA RR. | |
653 | */ | |
aaba7d03 | 654 | if (i == n) |
880a1e77 JH |
655 | break; |
656 | ||
657 | /* Peer's chain contains an issuer ca. */ | |
658 | ca = sk_X509_delete(in, i); | |
659 | ||
660 | /* If not a trust anchor, record untrusted ca and continue. */ | |
aaba7d03 VD |
661 | if ((matched = match(dane->selectors[DANESSL_USAGE_DANE_TA], ca, |
662 | depth + 1)) == 0) | |
880a1e77 | 663 | { |
aaba7d03 | 664 | if (grow_chain(dane, UNTRUSTED, ca)) |
880a1e77 | 665 | { |
a1ffb971 | 666 | if (X509_check_issued(ca, ca) != X509_V_OK) |
880a1e77 JH |
667 | { |
668 | /* Restart with issuer as subject */ | |
669 | cert = ca; | |
670 | continue; | |
671 | } | |
672 | /* Final self-signed element, skip ta_signed() check. */ | |
673 | cert = 0; | |
674 | } | |
675 | else | |
676 | matched = -1; | |
e682570f | 677 | } |
880a1e77 JH |
678 | else if(matched == MATCHED_CERT) |
679 | { | |
680 | if(!wrap_cert(dane, ca, depth)) | |
681 | matched = -1; | |
e682570f | 682 | } |
880a1e77 JH |
683 | else if(matched == MATCHED_PKEY) |
684 | { | |
aaba7d03 VD |
685 | if ( !(takey = X509_get_pubkey(ca)) |
686 | || !wrap_issuer(dane, takey, cert, depth, WRAP_MID)) | |
880a1e77 | 687 | { |
aaba7d03 | 688 | if (takey) |
880a1e77 JH |
689 | EVP_PKEY_free(takey); |
690 | else | |
aaba7d03 | 691 | DANEerr(DANESSL_F_SET_TRUST_ANCHOR, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
692 | matched = -1; |
693 | } | |
e682570f | 694 | } |
880a1e77 JH |
695 | break; |
696 | } | |
e682570f | 697 | |
880a1e77 JH |
698 | /* Shallow free the duplicated input untrusted chain. */ |
699 | sk_X509_free(in); | |
e682570f | 700 | |
880a1e77 JH |
701 | /* |
702 | * When the loop exits, if "cert" is set, it is not self-signed and has | |
703 | * no issuer in the chain, we check for a possible signature via a DNS | |
704 | * obtained TA cert or public key. | |
705 | */ | |
aaba7d03 | 706 | if (matched == 0 && cert) |
880a1e77 | 707 | matched = ta_signed(dane, cert, depth); |
e682570f | 708 | |
880a1e77 | 709 | return matched; |
e682570f TL |
710 | } |
711 | ||
880a1e77 JH |
712 | static int |
713 | check_end_entity(X509_STORE_CTX *ctx, ssl_dane *dane, X509 *cert) | |
e682570f | 714 | { |
880a1e77 JH |
715 | int matched; |
716 | ||
aaba7d03 VD |
717 | matched = match(dane->selectors[DANESSL_USAGE_DANE_EE], cert, 0); |
718 | if (matched > 0) | |
719 | { | |
720 | dane->mdpth = 0; | |
721 | dane->match = cert; | |
722 | X509_up_ref(cert); | |
e3555426 | 723 | if(!X509_STORE_CTX_get0_chain(ctx)) |
85098ee7 | 724 | { |
e3555426 JH |
725 | STACK_OF(X509) * sk = sk_X509_new_null(); |
726 | if (sk && sk_X509_push(sk, cert)) | |
727 | { | |
aaba7d03 | 728 | X509_up_ref(cert); |
3376de6c | 729 | X509_STORE_CTX_set0_verified_chain(ctx, sk); |
e3555426 | 730 | } |
880a1e77 JH |
731 | else |
732 | { | |
3376de6c | 733 | if (sk) sk_X509_free(sk); |
aaba7d03 | 734 | DANEerr(DANESSL_F_CHECK_END_ENTITY, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
735 | return -1; |
736 | } | |
85098ee7 | 737 | } |
aaba7d03 | 738 | } |
880a1e77 | 739 | return matched; |
e682570f TL |
740 | } |
741 | ||
880a1e77 JH |
742 | static int |
743 | match_name(const char *certid, ssl_dane *dane) | |
e682570f | 744 | { |
880a1e77 | 745 | int multi = dane->multi; |
880a1e77 | 746 | |
d7978c0f | 747 | for (dane_host_list hosts = dane->hosts; hosts; hosts = hosts->next) |
880a1e77 JH |
748 | { |
749 | int match_subdomain = 0; | |
750 | const char *domain = hosts->value; | |
751 | const char *parent; | |
752 | int idlen; | |
753 | int domlen; | |
754 | ||
aaba7d03 | 755 | if (*domain == '.' && domain[1] != '\0') |
880a1e77 JH |
756 | { |
757 | ++domain; | |
758 | match_subdomain = 1; | |
e682570f | 759 | } |
880a1e77 JH |
760 | |
761 | /* | |
762 | * Sub-domain match: certid is any sub-domain of hostname. | |
763 | */ | |
764 | if(match_subdomain) | |
85098ee7 | 765 | { |
aaba7d03 VD |
766 | if ( (idlen = strlen(certid)) > (domlen = strlen(domain)) + 1 |
767 | && certid[idlen - domlen - 1] == '.' | |
768 | && !strcasecmp(certid + (idlen - domlen), domain)) | |
880a1e77 JH |
769 | return 1; |
770 | else | |
771 | continue; | |
85098ee7 | 772 | } |
880a1e77 JH |
773 | |
774 | /* | |
775 | * Exact match and initial "*" match. The initial "*" in a certid | |
776 | * matches one (if multi is false) or more hostname components under | |
777 | * the condition that the certid contains multiple hostname components. | |
778 | */ | |
aaba7d03 VD |
779 | if ( !strcasecmp(certid, domain) |
780 | || ( certid[0] == '*' && certid[1] == '.' && certid[2] != 0 | |
781 | && (parent = strchr(domain, '.')) != 0 | |
782 | && (idlen = strlen(certid + 1)) <= (domlen = strlen(parent)) | |
783 | && strcasecmp(multi ? parent + domlen - idlen : parent, certid+1) == 0)) | |
880a1e77 JH |
784 | return 1; |
785 | } | |
786 | return 0; | |
e682570f TL |
787 | } |
788 | ||
3376de6c JH |
789 | static const char * |
790 | check_name(const char *name, int len) | |
e682570f | 791 | { |
3376de6c | 792 | const char *cp = name + len; |
880a1e77 | 793 | |
aaba7d03 | 794 | while (len > 0 && !*--cp) |
880a1e77 | 795 | --len; /* Ignore trailing NULs */ |
aaba7d03 | 796 | if (len <= 0) |
880a1e77 | 797 | return 0; |
aaba7d03 | 798 | for (cp = name; *cp; cp++) |
880a1e77 JH |
799 | { |
800 | char c = *cp; | |
801 | if (!((c >= 'a' && c <= 'z') || | |
802 | (c >= '0' && c <= '9') || | |
803 | (c >= 'A' && c <= 'Z') || | |
804 | (c == '.' || c == '-') || | |
805 | (c == '*'))) | |
806 | return 0; /* Only LDH, '.' and '*' */ | |
807 | } | |
aaba7d03 | 808 | if (cp - name != len) /* Guard against internal NULs */ |
880a1e77 JH |
809 | return 0; |
810 | return name; | |
e682570f TL |
811 | } |
812 | ||
3376de6c | 813 | static const char * |
880a1e77 | 814 | parse_dns_name(const GENERAL_NAME *gn) |
e682570f | 815 | { |
aaba7d03 | 816 | if (gn->type != GEN_DNS) |
880a1e77 | 817 | return 0; |
aaba7d03 | 818 | if (ASN1_STRING_type(gn->d.ia5) != V_ASN1_IA5STRING) |
880a1e77 | 819 | return 0; |
5903c6ff | 820 | return check_name(CCS ASN1_STRING_get0_data(gn->d.ia5), |
880a1e77 | 821 | ASN1_STRING_length(gn->d.ia5)); |
e682570f TL |
822 | } |
823 | ||
880a1e77 JH |
824 | static char * |
825 | parse_subject_name(X509 *cert) | |
e682570f | 826 | { |
880a1e77 JH |
827 | X509_NAME *name = X509_get_subject_name(cert); |
828 | X509_NAME_ENTRY *entry; | |
829 | ASN1_STRING *entry_str; | |
830 | unsigned char *namebuf; | |
831 | int nid = NID_commonName; | |
832 | int len; | |
833 | int i; | |
834 | ||
aaba7d03 | 835 | if (!name || (i = X509_NAME_get_index_by_NID(name, nid, -1)) < 0) |
880a1e77 | 836 | return 0; |
aaba7d03 | 837 | if (!(entry = X509_NAME_get_entry(name, i))) |
880a1e77 | 838 | return 0; |
aaba7d03 | 839 | if (!(entry_str = X509_NAME_ENTRY_get_data(entry))) |
880a1e77 JH |
840 | return 0; |
841 | ||
aaba7d03 | 842 | if ((len = ASN1_STRING_to_UTF8(&namebuf, entry_str)) < 0) |
880a1e77 | 843 | return 0; |
5903c6ff | 844 | if (len <= 0 || check_name(CS namebuf, len) == 0) |
880a1e77 JH |
845 | { |
846 | OPENSSL_free(namebuf); | |
847 | return 0; | |
848 | } | |
5903c6ff | 849 | return CS namebuf; |
e682570f TL |
850 | } |
851 | ||
880a1e77 JH |
852 | static int |
853 | name_check(ssl_dane *dane, X509 *cert) | |
e682570f | 854 | { |
880a1e77 JH |
855 | int matched = 0; |
856 | BOOL got_altname = FALSE; | |
857 | GENERAL_NAMES *gens; | |
858 | ||
859 | gens = X509_get_ext_d2i(cert, NID_subject_alt_name, 0, 0); | |
aaba7d03 | 860 | if (gens) |
880a1e77 JH |
861 | { |
862 | int n = sk_GENERAL_NAME_num(gens); | |
880a1e77 | 863 | |
d7978c0f | 864 | for (int i = 0; i < n; ++i) |
880a1e77 JH |
865 | { |
866 | const GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, i); | |
867 | const char *certid; | |
868 | ||
aaba7d03 | 869 | if (gn->type != GEN_DNS) |
880a1e77 JH |
870 | continue; |
871 | got_altname = TRUE; | |
872 | certid = parse_dns_name(gn); | |
aaba7d03 | 873 | if (certid && *certid) |
880a1e77 | 874 | { |
aaba7d03 | 875 | if ((matched = match_name(certid, dane)) == 0) |
880a1e77 | 876 | continue; |
aaba7d03 | 877 | if (!(dane->mhost = OPENSSL_strdup(certid))) |
880a1e77 | 878 | matched = -1; |
f2f2c91b | 879 | DEBUG(D_tls) debug_printf("Dane name_check: matched SAN %s\n", certid); |
880a1e77 JH |
880 | break; |
881 | } | |
e682570f | 882 | } |
880a1e77 JH |
883 | GENERAL_NAMES_free(gens); |
884 | } | |
885 | ||
886 | /* | |
887 | * XXX: Should the subjectName be skipped when *any* altnames are present, | |
888 | * or only when DNS altnames are present? | |
889 | */ | |
f2f2c91b | 890 | if (!got_altname) |
880a1e77 JH |
891 | { |
892 | char *certid = parse_subject_name(cert); | |
f2f2c91b JH |
893 | if (certid != 0 && *certid && (matched = match_name(certid, dane)) != 0) |
894 | { | |
895 | DEBUG(D_tls) debug_printf("Dane name_check: matched SN %s\n", certid); | |
aaba7d03 | 896 | dane->mhost = OPENSSL_strdup(certid); |
f2f2c91b JH |
897 | } |
898 | if (certid) | |
899 | OPENSSL_free(certid); | |
880a1e77 JH |
900 | } |
901 | return matched; | |
e682570f TL |
902 | } |
903 | ||
880a1e77 JH |
904 | static int |
905 | verify_chain(X509_STORE_CTX *ctx) | |
e682570f | 906 | { |
e3555426 JH |
907 | int (*cb)(int, X509_STORE_CTX *) = X509_STORE_CTX_get_verify_cb(ctx); |
908 | X509 *cert = X509_STORE_CTX_get0_cert(ctx); | |
3376de6c JH |
909 | STACK_OF(X509) * chain = X509_STORE_CTX_get0_chain(ctx); |
910 | int chain_length = sk_X509_num(chain); | |
880a1e77 JH |
911 | int ssl_idx = SSL_get_ex_data_X509_STORE_CTX_idx(); |
912 | SSL *ssl = X509_STORE_CTX_get_ex_data(ctx, ssl_idx); | |
913 | ssl_dane *dane = SSL_get_ex_data(ssl, dane_idx); | |
e3555426 JH |
914 | dane_selector_list issuer_rrs = dane->selectors[DANESSL_USAGE_PKIX_TA]; |
915 | dane_selector_list leaf_rrs = dane->selectors[DANESSL_USAGE_PKIX_EE]; | |
880a1e77 | 916 | int matched = 0; |
880a1e77 | 917 | |
f2f2c91b | 918 | DEBUG(D_tls) debug_printf("Dane verify_chain\n"); |
6634ac8d | 919 | |
3376de6c | 920 | /* Restore OpenSSL's internal_verify() as the signature check function */ |
e3555426 | 921 | X509_STORE_CTX_set_verify(ctx, dane->verify); |
880a1e77 | 922 | |
aaba7d03 | 923 | if ((matched = name_check(dane, cert)) < 0) |
880a1e77 JH |
924 | { |
925 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_OUT_OF_MEM); | |
926 | return 0; | |
927 | } | |
928 | ||
aaba7d03 | 929 | if (!matched) |
880a1e77 | 930 | { |
e3555426 JH |
931 | X509_STORE_CTX_set_error_depth(ctx, 0); |
932 | X509_STORE_CTX_set_current_cert(ctx, cert); | |
880a1e77 | 933 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH); |
aaba7d03 | 934 | if (!cb(0, ctx)) |
880a1e77 JH |
935 | return 0; |
936 | } | |
937 | matched = 0; | |
938 | ||
f2f2c91b JH |
939 | /* |
940 | * Satisfy at least one usage 0 or 1 constraint, unless we've already | |
941 | * matched a usage 2 trust anchor. | |
942 | * | |
943 | * XXX: internal_verify() doesn't callback with top certs that are not | |
3376de6c | 944 | * self-issued. This is fixed in OpenSSL 1.1.0. |
f2f2c91b JH |
945 | */ |
946 | if (dane->roots && sk_X509_num(dane->roots)) | |
947 | { | |
3376de6c | 948 | X509 *top = sk_X509_value(chain, dane->depth); |
880a1e77 | 949 | |
f2f2c91b JH |
950 | dane->mdpth = dane->depth; |
951 | dane->match = top; | |
952 | X509_up_ref(top); | |
aaba7d03 | 953 | |
3376de6c | 954 | #if OPENSSL_VERSION_NUMBER < 0x10100000L |
f2f2c91b JH |
955 | if (X509_check_issued(top, top) != X509_V_OK) |
956 | { | |
e3555426 JH |
957 | X509_STORE_CTX_set_error_depth(ctx, dane->depth); |
958 | X509_STORE_CTX_set_current_cert(ctx, top); | |
f2f2c91b JH |
959 | if (!cb(1, ctx)) |
960 | return 0; | |
961 | } | |
880a1e77 JH |
962 | #endif |
963 | /* Pop synthetic trust-anchor ancestors off the chain! */ | |
964 | while (--chain_length > dane->depth) | |
3376de6c | 965 | X509_free(sk_X509_pop(chain)); |
880a1e77 | 966 | } |
aaba7d03 | 967 | else |
880a1e77 | 968 | { |
aaba7d03 VD |
969 | int n = 0; |
970 | X509 *xn = cert; | |
880a1e77 JH |
971 | |
972 | /* | |
973 | * Check for an EE match, then a CA match at depths > 0, and | |
974 | * finally, if the EE cert is self-issued, for a depth 0 CA match. | |
975 | */ | |
aaba7d03 VD |
976 | if (leaf_rrs) |
977 | matched = match(leaf_rrs, xn, 0); | |
f2f2c91b | 978 | if (matched) DEBUG(D_tls) debug_printf("Dane verify_chain: matched EE\n"); |
880a1e77 | 979 | |
f92c5522 VD |
980 | if (!matched && issuer_rrs) |
981 | for (n = chain_length-1; !matched && n >= 0; --n) | |
aaba7d03 | 982 | { |
3376de6c | 983 | xn = sk_X509_value(chain, n); |
f92c5522 VD |
984 | if (n > 0 || X509_check_issued(xn, xn) == X509_V_OK) |
985 | matched = match(issuer_rrs, xn, n); | |
aaba7d03 | 986 | } |
f2f2c91b JH |
987 | if (matched) DEBUG(D_tls) debug_printf("Dane verify_chain: matched %s\n", |
988 | n>0 ? "CA" : "selfisssued EE"); | |
f92c5522 VD |
989 | |
990 | if (!matched) | |
991 | { | |
e3555426 JH |
992 | X509_STORE_CTX_set_error_depth(ctx, 0); |
993 | X509_STORE_CTX_set_current_cert(ctx, cert); | |
f92c5522 VD |
994 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_CERT_UNTRUSTED); |
995 | if (!cb(0, ctx)) | |
996 | return 0; | |
997 | } | |
998 | else | |
999 | { | |
1000 | dane->mdpth = n; | |
1001 | dane->match = xn; | |
1002 | X509_up_ref(xn); | |
e682570f | 1003 | } |
f92c5522 | 1004 | } |
e682570f | 1005 | |
3376de6c JH |
1006 | /* Tail recurse into OpenSSL's internal_verify */ |
1007 | return dane->verify(ctx); | |
aaba7d03 | 1008 | } |
e682570f | 1009 | |
aaba7d03 VD |
1010 | static void |
1011 | dane_reset(ssl_dane *dane) | |
1012 | { | |
1013 | dane->depth = -1; | |
1014 | if (dane->mhost) | |
1015 | { | |
1016 | OPENSSL_free(dane->mhost); | |
1017 | dane->mhost = 0; | |
880a1e77 | 1018 | } |
aaba7d03 VD |
1019 | if (dane->roots) |
1020 | { | |
1021 | sk_X509_pop_free(dane->roots, X509_free); | |
1022 | dane->roots = 0; | |
1023 | } | |
1024 | if (dane->chain) | |
1025 | { | |
1026 | sk_X509_pop_free(dane->chain, X509_free); | |
1027 | dane->chain = 0; | |
1028 | } | |
1029 | if (dane->match) | |
1030 | { | |
1031 | X509_free(dane->match); | |
1032 | dane->match = 0; | |
1033 | } | |
1034 | dane->mdpth = -1; | |
e682570f TL |
1035 | } |
1036 | ||
880a1e77 JH |
1037 | static int |
1038 | verify_cert(X509_STORE_CTX *ctx, void *unused_ctx) | |
e682570f | 1039 | { |
880a1e77 JH |
1040 | static int ssl_idx = -1; |
1041 | SSL *ssl; | |
1042 | ssl_dane *dane; | |
e3555426 JH |
1043 | int (*cb)(int, X509_STORE_CTX *) = X509_STORE_CTX_get_verify_cb(ctx); |
1044 | X509 *cert = X509_STORE_CTX_get0_cert(ctx); | |
880a1e77 | 1045 | int matched; |
880a1e77 | 1046 | |
f2f2c91b | 1047 | DEBUG(D_tls) debug_printf("Dane verify_cert\n"); |
6634ac8d | 1048 | |
aaba7d03 | 1049 | if (ssl_idx < 0) |
880a1e77 | 1050 | ssl_idx = SSL_get_ex_data_X509_STORE_CTX_idx(); |
aaba7d03 | 1051 | if (dane_idx < 0) |
880a1e77 | 1052 | { |
aaba7d03 | 1053 | DANEerr(DANESSL_F_VERIFY_CERT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1054 | return -1; |
1055 | } | |
1056 | ||
1057 | ssl = X509_STORE_CTX_get_ex_data(ctx, ssl_idx); | |
aaba7d03 | 1058 | if (!(dane = SSL_get_ex_data(ssl, dane_idx)) || !cert) |
880a1e77 JH |
1059 | return X509_verify_cert(ctx); |
1060 | ||
f2f2c91b | 1061 | /* Reset for verification of a new chain, perhaps a renegotiation. */ |
aaba7d03 VD |
1062 | dane_reset(dane); |
1063 | ||
1064 | if (dane->selectors[DANESSL_USAGE_DANE_EE]) | |
880a1e77 | 1065 | { |
aaba7d03 | 1066 | if ((matched = check_end_entity(ctx, dane, cert)) > 0) |
880a1e77 | 1067 | { |
e3555426 JH |
1068 | X509_STORE_CTX_set_error_depth(ctx, 0); |
1069 | X509_STORE_CTX_set_current_cert(ctx, cert); | |
880a1e77 | 1070 | return cb(1, ctx); |
e682570f | 1071 | } |
aaba7d03 | 1072 | if (matched < 0) |
880a1e77 JH |
1073 | { |
1074 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_OUT_OF_MEM); | |
1075 | return -1; | |
e682570f | 1076 | } |
880a1e77 | 1077 | } |
e682570f | 1078 | |
aaba7d03 | 1079 | if (dane->selectors[DANESSL_USAGE_DANE_TA]) |
880a1e77 | 1080 | { |
aaba7d03 VD |
1081 | if ((matched = set_trust_anchor(ctx, dane, cert)) < 0) |
1082 | { | |
1083 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_OUT_OF_MEM); | |
1084 | return -1; | |
1085 | } | |
1086 | if (matched) | |
1087 | { | |
1088 | /* | |
1089 | * Check that setting the untrusted chain updates the expected | |
1090 | * structure member at the expected offset. | |
1091 | */ | |
1092 | X509_STORE_CTX_trusted_stack(ctx, dane->roots); | |
1093 | X509_STORE_CTX_set_chain(ctx, dane->chain); | |
3376de6c | 1094 | OPENSSL_assert(dane->chain == X509_STORE_CTX_get0_untrusted(ctx)); |
aaba7d03 | 1095 | } |
880a1e77 | 1096 | } |
e682570f | 1097 | |
aaba7d03 VD |
1098 | /* |
1099 | * Name checks and usage 0/1 constraint enforcement are delayed until | |
1100 | * X509_verify_cert() builds the full chain and calls our verify_chain() | |
1101 | * wrapper. | |
1102 | */ | |
e3555426 JH |
1103 | dane->verify = X509_STORE_CTX_get_verify(ctx); |
1104 | X509_STORE_CTX_set_verify(ctx, verify_chain); | |
aaba7d03 VD |
1105 | |
1106 | if (X509_verify_cert(ctx)) | |
1107 | return 1; | |
880a1e77 | 1108 | |
aaba7d03 VD |
1109 | /* |
1110 | * If the chain is invalid, clear any matching cert or hostname, to | |
1111 | * protect callers that might erroneously rely on these alone without | |
1112 | * checking the validation status. | |
1113 | */ | |
1114 | if (dane->match) | |
1115 | { | |
1116 | X509_free(dane->match); | |
1117 | dane->match = 0; | |
1118 | } | |
1119 | if (dane->mhost) | |
1120 | { | |
1121 | OPENSSL_free(dane->mhost); | |
1122 | dane->mhost = 0; | |
1123 | } | |
1124 | return 0; | |
e682570f TL |
1125 | } |
1126 | ||
880a1e77 JH |
1127 | static dane_list |
1128 | list_alloc(size_t vsize) | |
e682570f | 1129 | { |
880a1e77 JH |
1130 | void *value = (void *) OPENSSL_malloc(vsize); |
1131 | dane_list l; | |
1132 | ||
aaba7d03 | 1133 | if (!value) |
880a1e77 | 1134 | { |
aaba7d03 | 1135 | DANEerr(DANESSL_F_LIST_ALLOC, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1136 | return 0; |
1137 | } | |
aaba7d03 | 1138 | if (!(l = (dane_list) OPENSSL_malloc(sizeof(*l)))) |
880a1e77 JH |
1139 | { |
1140 | OPENSSL_free(value); | |
aaba7d03 | 1141 | DANEerr(DANESSL_F_LIST_ALLOC, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1142 | return 0; |
1143 | } | |
1144 | l->next = 0; | |
1145 | l->value = value; | |
1146 | return l; | |
e682570f TL |
1147 | } |
1148 | ||
880a1e77 JH |
1149 | static void |
1150 | list_free(void *list, void (*f)(void *)) | |
e682570f | 1151 | { |
880a1e77 JH |
1152 | dane_list next; |
1153 | ||
d7978c0f | 1154 | for (dane_list head = (dane_list) list; head; head = next) |
880a1e77 JH |
1155 | { |
1156 | next = head->next; | |
1157 | if (f && head->value) | |
1158 | f(head->value); | |
1159 | OPENSSL_free(head); | |
1160 | } | |
e682570f TL |
1161 | } |
1162 | ||
3376de6c JH |
1163 | static void |
1164 | ossl_free(void * p) | |
1165 | { | |
1166 | OPENSSL_free(p); | |
1167 | } | |
1168 | ||
880a1e77 JH |
1169 | static void |
1170 | dane_mtype_free(void *p) | |
e682570f | 1171 | { |
3376de6c | 1172 | list_free(((dane_mtype) p)->data, ossl_free); |
880a1e77 | 1173 | OPENSSL_free(p); |
e682570f TL |
1174 | } |
1175 | ||
880a1e77 JH |
1176 | static void |
1177 | dane_selector_free(void *p) | |
e682570f | 1178 | { |
880a1e77 JH |
1179 | list_free(((dane_selector) p)->mtype, dane_mtype_free); |
1180 | OPENSSL_free(p); | |
e682570f TL |
1181 | } |
1182 | ||
946ecbe0 JH |
1183 | |
1184 | ||
1185 | /* | |
1186 | ||
1187 | Tidy up once the connection is finished with. | |
1188 | ||
1189 | Arguments | |
1190 | ssl The ssl connection handle | |
1191 | ||
1192 | => Before calling SSL_free() | |
1193 | tls_close() and tls_getc() [the error path] are the obvious places. | |
1194 | Could we do it earlier - right after verification? In tls_client_start() | |
1195 | right after SSL_connect() returns, in that case. | |
1196 | ||
1197 | */ | |
1198 | ||
880a1e77 JH |
1199 | void |
1200 | DANESSL_cleanup(SSL *ssl) | |
e682570f | 1201 | { |
880a1e77 | 1202 | ssl_dane *dane; |
880a1e77 | 1203 | |
e5cccda9 | 1204 | DEBUG(D_tls) debug_printf("Dane lib-cleanup\n"); |
6634ac8d | 1205 | |
aaba7d03 | 1206 | if (dane_idx < 0 || !(dane = SSL_get_ex_data(ssl, dane_idx))) |
880a1e77 JH |
1207 | return; |
1208 | (void) SSL_set_ex_data(ssl, dane_idx, 0); | |
1209 | ||
aaba7d03 VD |
1210 | dane_reset(dane); |
1211 | if (dane->hosts) | |
3376de6c | 1212 | list_free(dane->hosts, ossl_free); |
d7978c0f | 1213 | for (int u = 0; u <= DANESSL_USAGE_LAST; ++u) |
aaba7d03 | 1214 | if (dane->selectors[u]) |
880a1e77 | 1215 | list_free(dane->selectors[u], dane_selector_free); |
aaba7d03 | 1216 | if (dane->pkeys) |
880a1e77 | 1217 | list_free(dane->pkeys, pkey_free); |
aaba7d03 | 1218 | if (dane->certs) |
880a1e77 | 1219 | list_free(dane->certs, cert_free); |
880a1e77 | 1220 | OPENSSL_free(dane); |
e682570f TL |
1221 | } |
1222 | ||
880a1e77 JH |
1223 | static dane_host_list |
1224 | host_list_init(const char **src) | |
e682570f | 1225 | { |
880a1e77 JH |
1226 | dane_host_list head = NULL; |
1227 | ||
aaba7d03 | 1228 | while (*src) |
880a1e77 JH |
1229 | { |
1230 | dane_host_list elem = (dane_host_list) OPENSSL_malloc(sizeof(*elem)); | |
aaba7d03 | 1231 | if (elem == 0) |
880a1e77 | 1232 | { |
3376de6c | 1233 | list_free(head, ossl_free); |
880a1e77 | 1234 | return 0; |
e682570f | 1235 | } |
880a1e77 JH |
1236 | elem->value = OPENSSL_strdup(*src++); |
1237 | LINSERT(head, elem); | |
1238 | } | |
1239 | return head; | |
e682570f TL |
1240 | } |
1241 | ||
946ecbe0 | 1242 | |
aaba7d03 VD |
1243 | int |
1244 | DANESSL_get_match_cert(SSL *ssl, X509 **match, const char **mhost, int *depth) | |
1245 | { | |
1246 | ssl_dane *dane; | |
1247 | ||
1248 | if (dane_idx < 0 || (dane = SSL_get_ex_data(ssl, dane_idx)) == 0) | |
1249 | { | |
1250 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_INIT); | |
1251 | return -1; | |
1252 | } | |
1253 | ||
1254 | if (dane->match) | |
1255 | { | |
1256 | if (match) | |
1257 | *match = dane->match; | |
1258 | if (mhost) | |
1259 | *mhost = dane->mhost; | |
1260 | if (depth) | |
1261 | *depth = dane->mdpth; | |
1262 | } | |
1263 | ||
1264 | return (dane->match != 0); | |
1265 | } | |
1266 | ||
1267 | ||
1268 | #ifdef never_called | |
1269 | int | |
1270 | DANESSL_verify_chain(SSL *ssl, STACK_OF(X509) *chain) | |
1271 | { | |
1272 | int ret; | |
1273 | X509 *cert; | |
3376de6c | 1274 | X509_STORE_CTX * store_ctx; |
aaba7d03 VD |
1275 | SSL_CTX *ssl_ctx = SSL_get_SSL_CTX(ssl); |
1276 | X509_STORE *store = SSL_CTX_get_cert_store(ssl_ctx); | |
1277 | int store_ctx_idx = SSL_get_ex_data_X509_STORE_CTX_idx(); | |
1278 | ||
1279 | cert = sk_X509_value(chain, 0); | |
3376de6c JH |
1280 | if (!(store_ctx = X509_STORE_CTX_new())) |
1281 | { | |
1282 | DANEerr(DANESSL_F_DANESSL_VERIFY_CHAIN, ERR_R_MALLOC_FAILURE); | |
1283 | return 0; | |
1284 | } | |
1285 | if (!X509_STORE_CTX_init(store_ctx, store, cert, chain)) | |
1286 | { | |
1287 | X509_STORE_CTX_free(store_ctx); | |
aaba7d03 | 1288 | return 0; |
3376de6c JH |
1289 | } |
1290 | X509_STORE_CTX_set_ex_data(store_ctx, store_ctx_idx, ssl); | |
aaba7d03 | 1291 | |
3376de6c | 1292 | X509_STORE_CTX_set_default(store_ctx, |
aaba7d03 | 1293 | SSL_is_server(ssl) ? "ssl_client" : "ssl_server"); |
3376de6c | 1294 | X509_VERIFY_PARAM_set1(X509_STORE_CTX_get0_param(store_ctx), |
aaba7d03 VD |
1295 | SSL_get0_param(ssl)); |
1296 | ||
1297 | if (SSL_get_verify_callback(ssl)) | |
3376de6c | 1298 | X509_STORE_CTX_set_verify_cb(store_ctx, SSL_get_verify_callback(ssl)); |
aaba7d03 | 1299 | |
3376de6c | 1300 | ret = verify_cert(store_ctx, NULL); |
aaba7d03 | 1301 | |
3376de6c JH |
1302 | SSL_set_verify_result(ssl, X509_STORE_CTX_get_error(store_ctx)); |
1303 | X509_STORE_CTX_cleanup(store_ctx); | |
aaba7d03 VD |
1304 | |
1305 | return (ret); | |
1306 | } | |
1307 | #endif | |
1308 | ||
1309 | ||
946ecbe0 JH |
1310 | |
1311 | ||
1312 | /* | |
1313 | ||
1314 | Call this for each TLSA record found for the target, after the | |
1315 | DANE setup has been done on the ssl connection handle. | |
1316 | ||
1317 | Arguments: | |
1318 | ssl Connection handle | |
1319 | usage TLSA record field | |
1320 | selector TLSA record field | |
1321 | mdname ??? message digest name? | |
1322 | data ??? TLSA record megalump? | |
1323 | dlen length of data | |
1324 | ||
1325 | Return | |
1326 | -1 on error | |
1327 | 0 action not taken | |
1328 | 1 record accepted | |
1329 | */ | |
1330 | ||
880a1e77 JH |
1331 | int |
1332 | DANESSL_add_tlsa(SSL *ssl, uint8_t usage, uint8_t selector, const char *mdname, | |
1333 | unsigned const char *data, size_t dlen) | |
e682570f | 1334 | { |
880a1e77 JH |
1335 | ssl_dane *dane; |
1336 | dane_selector_list s = 0; | |
1337 | dane_mtype_list m = 0; | |
1338 | dane_data_list d = 0; | |
1339 | dane_cert_list xlist = 0; | |
1340 | dane_pkey_list klist = 0; | |
1341 | const EVP_MD *md = 0; | |
1342 | ||
b4161d10 JH |
1343 | DEBUG(D_tls) debug_printf("Dane add-tlsa: usage %u sel %u mdname \"%s\"\n", |
1344 | usage, selector, mdname); | |
6634ac8d | 1345 | |
880a1e77 JH |
1346 | if(dane_idx < 0 || !(dane = SSL_get_ex_data(ssl, dane_idx))) |
1347 | { | |
aaba7d03 | 1348 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_INIT); |
880a1e77 JH |
1349 | return -1; |
1350 | } | |
1351 | ||
aaba7d03 | 1352 | if (usage > DANESSL_USAGE_LAST) |
880a1e77 | 1353 | { |
aaba7d03 | 1354 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_USAGE); |
880a1e77 JH |
1355 | return 0; |
1356 | } | |
aaba7d03 | 1357 | if (selector > DANESSL_SELECTOR_LAST) |
880a1e77 | 1358 | { |
aaba7d03 | 1359 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_SELECTOR); |
880a1e77 JH |
1360 | return 0; |
1361 | } | |
1362 | ||
854586e1 JH |
1363 | /* Support built-in standard one-digit mtypes */ |
1364 | if (mdname && *mdname && mdname[1] == '\0') | |
1365 | switch (*mdname - '0') | |
1366 | { | |
1367 | case DANESSL_MATCHING_FULL: mdname = 0; break; | |
1368 | case DANESSL_MATCHING_2256: mdname = "sha256"; break; | |
1369 | case DANESSL_MATCHING_2512: mdname = "sha512"; break; | |
1370 | } | |
1371 | if (mdname && *mdname && !(md = EVP_get_digestbyname(mdname))) | |
1372 | { | |
1373 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_DIGEST); | |
1374 | return 0; | |
1375 | } | |
1376 | if (mdname && *mdname && dlen != EVP_MD_size(md)) | |
1377 | { | |
1378 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_DATA_LENGTH); | |
1379 | return 0; | |
1380 | } | |
1381 | if (!data) | |
1382 | { | |
1383 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_NULL_DATA); | |
1384 | return 0; | |
1385 | } | |
aaba7d03 | 1386 | |
854586e1 JH |
1387 | /* |
1388 | * Full Certificate or Public Key when NULL or empty digest name | |
1389 | */ | |
1390 | if (!mdname || !*mdname) | |
1391 | { | |
1392 | X509 *x = 0; | |
1393 | EVP_PKEY *k = 0; | |
1394 | const unsigned char *p = data; | |
e682570f TL |
1395 | |
1396 | #define xklistinit(lvar, ltype, var, freeFunc) do { \ | |
aaba7d03 VD |
1397 | (lvar) = (ltype) OPENSSL_malloc(sizeof(*(lvar))); \ |
1398 | if ((lvar) == 0) { \ | |
1399 | DANEerr(DANESSL_F_ADD_TLSA, ERR_R_MALLOC_FAILURE); \ | |
1400 | freeFunc((var)); \ | |
1401 | return 0; \ | |
1402 | } \ | |
1403 | (lvar)->next = 0; \ | |
1404 | lvar->value = var; \ | |
1405 | } while (0) | |
e682570f | 1406 | #define xkfreeret(ret) do { \ |
aaba7d03 VD |
1407 | if (xlist) list_free(xlist, cert_free); \ |
1408 | if (klist) list_free(klist, pkey_free); \ | |
1409 | return (ret); \ | |
1410 | } while (0) | |
880a1e77 | 1411 | |
aaba7d03 | 1412 | switch (selector) |
880a1e77 | 1413 | { |
aaba7d03 VD |
1414 | case DANESSL_SELECTOR_CERT: |
1415 | if (!d2i_X509(&x, &p, dlen) || dlen != p - data) | |
880a1e77 JH |
1416 | { |
1417 | if (x) | |
aaba7d03 VD |
1418 | X509_free(x); |
1419 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_CERT); | |
880a1e77 JH |
1420 | return 0; |
1421 | } | |
1422 | k = X509_get_pubkey(x); | |
1423 | EVP_PKEY_free(k); | |
aaba7d03 | 1424 | if (k == 0) |
880a1e77 JH |
1425 | { |
1426 | X509_free(x); | |
aaba7d03 | 1427 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_CERT_PKEY); |
880a1e77 JH |
1428 | return 0; |
1429 | } | |
aaba7d03 | 1430 | if (usage == DANESSL_USAGE_DANE_TA) |
880a1e77 JH |
1431 | xklistinit(xlist, dane_cert_list, x, X509_free); |
1432 | break; | |
1433 | ||
aaba7d03 VD |
1434 | case DANESSL_SELECTOR_SPKI: |
1435 | if (!d2i_PUBKEY(&k, &p, dlen) || dlen != p - data) | |
880a1e77 | 1436 | { |
aaba7d03 | 1437 | if (k) |
880a1e77 | 1438 | EVP_PKEY_free(k); |
aaba7d03 VD |
1439 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_PKEY); |
1440 | return 0; | |
880a1e77 | 1441 | } |
aaba7d03 | 1442 | if (usage == DANESSL_USAGE_DANE_TA) |
880a1e77 JH |
1443 | xklistinit(klist, dane_pkey_list, k, EVP_PKEY_free); |
1444 | break; | |
e682570f | 1445 | } |
880a1e77 JH |
1446 | } |
1447 | ||
1448 | /* Find insertion point and don't add duplicate elements. */ | |
aaba7d03 VD |
1449 | for (s = dane->selectors[usage]; s; s = s->next) |
1450 | if (s->value->selector == selector) | |
1451 | { | |
1452 | for (m = s->value->mtype; m; m = m->next) | |
1453 | if (m->value->md == md) | |
1454 | { | |
1455 | for (d = m->value->data; d; d = d->next) | |
1456 | if ( d->value->datalen == dlen | |
1457 | && memcmp(d->value->data, data, dlen) == 0) | |
880a1e77 | 1458 | xkfreeret(1); |
aaba7d03 VD |
1459 | break; |
1460 | } | |
1461 | break; | |
1462 | } | |
880a1e77 | 1463 | |
aaba7d03 | 1464 | if ((d = (dane_data_list) list_alloc(sizeof(*d->value) + dlen)) == 0) |
880a1e77 JH |
1465 | xkfreeret(0); |
1466 | d->value->datalen = dlen; | |
1467 | memcpy(d->value->data, data, dlen); | |
aaba7d03 | 1468 | if (!m) |
880a1e77 | 1469 | { |
aaba7d03 | 1470 | if ((m = (dane_mtype_list) list_alloc(sizeof(*m->value))) == 0) |
880a1e77 | 1471 | { |
3376de6c | 1472 | list_free(d, ossl_free); |
880a1e77 | 1473 | xkfreeret(0); |
e682570f | 1474 | } |
880a1e77 | 1475 | m->value->data = 0; |
aaba7d03 | 1476 | if ((m->value->md = md) != 0) |
880a1e77 | 1477 | m->value->mdlen = dlen; |
aaba7d03 | 1478 | if (!s) |
880a1e77 | 1479 | { |
aaba7d03 | 1480 | if ((s = (dane_selector_list) list_alloc(sizeof(*s->value))) == 0) |
880a1e77 JH |
1481 | { |
1482 | list_free(m, dane_mtype_free); | |
1483 | xkfreeret(0); | |
1484 | } | |
1485 | s->value->mtype = 0; | |
1486 | s->value->selector = selector; | |
1487 | LINSERT(dane->selectors[usage], s); | |
1488 | } | |
1489 | LINSERT(s->value->mtype, m); | |
1490 | } | |
1491 | LINSERT(m->value->data, d); | |
1492 | ||
aaba7d03 | 1493 | if (xlist) |
880a1e77 | 1494 | LINSERT(dane->certs, xlist); |
aaba7d03 | 1495 | else if (klist) |
880a1e77 JH |
1496 | LINSERT(dane->pkeys, klist); |
1497 | ++dane->count; | |
1498 | return 1; | |
e682570f TL |
1499 | } |
1500 | ||
946ecbe0 JH |
1501 | |
1502 | ||
1503 | ||
1504 | /* | |
1505 | Call this once we have an ssl connection handle but before | |
1506 | making the TLS connection. | |
1507 | ||
1508 | => In tls_client_start() after the call to SSL_new() | |
1509 | and before the call to SSL_connect(). Exactly where | |
1510 | probably does not matter. | |
1511 | We probably want to keep our existing SNI handling; | |
1512 | call this with NULL. | |
1513 | ||
1514 | Arguments: | |
1515 | ssl Connection handle | |
1516 | sni_domain Optional peer server name | |
868f5672 | 1517 | hostnames list of names to chack against peer cert |
946ecbe0 JH |
1518 | |
1519 | Return | |
1520 | -1 on fatal error | |
1521 | 0 nonfatal error | |
1522 | 1 success | |
1523 | */ | |
1524 | ||
880a1e77 JH |
1525 | int |
1526 | DANESSL_init(SSL *ssl, const char *sni_domain, const char **hostnames) | |
e682570f | 1527 | { |
880a1e77 | 1528 | ssl_dane *dane; |
e682570f | 1529 | |
aaba7d03 VD |
1530 | DEBUG(D_tls) debug_printf("Dane ssl_init\n"); |
1531 | if (dane_idx < 0) | |
880a1e77 | 1532 | { |
aaba7d03 | 1533 | DANEerr(DANESSL_F_INIT, DANESSL_R_LIBRARY_INIT); |
880a1e77 JH |
1534 | return -1; |
1535 | } | |
e682570f | 1536 | |
aaba7d03 VD |
1537 | if (sni_domain && !SSL_set_tlsext_host_name(ssl, sni_domain)) |
1538 | return 0; | |
e682570f | 1539 | |
aaba7d03 | 1540 | if ((dane = (ssl_dane *) OPENSSL_malloc(sizeof(ssl_dane))) == 0) |
880a1e77 | 1541 | { |
aaba7d03 | 1542 | DANEerr(DANESSL_F_INIT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1543 | return 0; |
1544 | } | |
aaba7d03 | 1545 | if (!SSL_set_ex_data(ssl, dane_idx, dane)) |
880a1e77 | 1546 | { |
aaba7d03 | 1547 | DANEerr(DANESSL_F_INIT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1548 | OPENSSL_free(dane); |
1549 | return 0; | |
1550 | } | |
1551 | ||
6634ac8d JH |
1552 | dane->verify = 0; |
1553 | dane->hosts = 0; | |
1554 | dane->thost = 0; | |
880a1e77 JH |
1555 | dane->pkeys = 0; |
1556 | dane->certs = 0; | |
1557 | dane->chain = 0; | |
aaba7d03 | 1558 | dane->match = 0; |
880a1e77 JH |
1559 | dane->roots = 0; |
1560 | dane->depth = -1; | |
aaba7d03 VD |
1561 | dane->mhost = 0; /* Future SSL control interface */ |
1562 | dane->mdpth = 0; /* Future SSL control interface */ | |
1563 | dane->multi = 0; /* Future SSL control interface */ | |
880a1e77 | 1564 | dane->count = 0; |
aaba7d03 | 1565 | dane->hosts = 0; |
880a1e77 | 1566 | |
d7978c0f | 1567 | for (int i = 0; i <= DANESSL_USAGE_LAST; ++i) |
aaba7d03 | 1568 | dane->selectors[i] = 0; |
880a1e77 | 1569 | |
aaba7d03 | 1570 | if (hostnames && (dane->hosts = host_list_init(hostnames)) == 0) |
880a1e77 | 1571 | { |
aaba7d03 | 1572 | DANEerr(DANESSL_F_INIT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1573 | DANESSL_cleanup(ssl); |
1574 | return 0; | |
1575 | } | |
1576 | ||
1577 | return 1; | |
e682570f TL |
1578 | } |
1579 | ||
946ecbe0 JH |
1580 | |
1581 | /* | |
1582 | ||
1583 | Call this once we have a context to work with, but | |
1584 | before DANESSL_init() | |
1585 | ||
1586 | => in tls_client_start(), after tls_init() call gives us the ctx, | |
1587 | if we decide we want to (policy) and can (TLSA records available) | |
1588 | replacing (? what about fallback) everything from testing tls_verify_hosts | |
1589 | down to just before calling SSL_new() for the conn handle. | |
1590 | ||
1591 | Arguments | |
1592 | ctx SSL context | |
1593 | ||
1594 | Return | |
1595 | -1 Error | |
1596 | 1 Success | |
1597 | */ | |
1598 | ||
880a1e77 JH |
1599 | int |
1600 | DANESSL_CTX_init(SSL_CTX *ctx) | |
e682570f | 1601 | { |
6634ac8d | 1602 | DEBUG(D_tls) debug_printf("Dane ctx-init\n"); |
aaba7d03 | 1603 | if (dane_idx >= 0) |
880a1e77 JH |
1604 | { |
1605 | SSL_CTX_set_cert_verify_callback(ctx, verify_cert, 0); | |
1606 | return 1; | |
1607 | } | |
aaba7d03 | 1608 | DANEerr(DANESSL_F_CTX_INIT, DANESSL_R_LIBRARY_INIT); |
880a1e77 | 1609 | return -1; |
e682570f TL |
1610 | } |
1611 | ||
880a1e77 JH |
1612 | static void |
1613 | dane_init(void) | |
e682570f | 1614 | { |
880a1e77 JH |
1615 | /* |
1616 | * Store library id in zeroth function slot, used to locate the library | |
1617 | * name. This must be done before we load the error strings. | |
1618 | */ | |
3376de6c JH |
1619 | err_lib_dane = ERR_get_next_error_library(); |
1620 | ||
e682570f | 1621 | #ifndef OPENSSL_NO_ERR |
3376de6c JH |
1622 | if (err_lib_dane > 0) |
1623 | { | |
1624 | dane_str_functs[0].error |= ERR_PACK(err_lib_dane, 0, 0); | |
1625 | ERR_load_strings(err_lib_dane, dane_str_functs); | |
1626 | ERR_load_strings(err_lib_dane, dane_str_reasons); | |
1627 | } | |
e682570f TL |
1628 | #endif |
1629 | ||
880a1e77 JH |
1630 | /* |
1631 | * Register SHA-2 digests, if implemented and not already registered. | |
1632 | */ | |
e682570f | 1633 | #if defined(LN_sha256) && defined(NID_sha256) && !defined(OPENSSL_NO_SHA256) |
aaba7d03 VD |
1634 | if (!EVP_get_digestbyname(LN_sha224)) EVP_add_digest(EVP_sha224()); |
1635 | if (!EVP_get_digestbyname(LN_sha256)) EVP_add_digest(EVP_sha256()); | |
e682570f TL |
1636 | #endif |
1637 | #if defined(LN_sha512) && defined(NID_sha512) && !defined(OPENSSL_NO_SHA512) | |
aaba7d03 VD |
1638 | if (!EVP_get_digestbyname(LN_sha384)) EVP_add_digest(EVP_sha384()); |
1639 | if (!EVP_get_digestbyname(LN_sha512)) EVP_add_digest(EVP_sha512()); | |
e682570f TL |
1640 | #endif |
1641 | ||
880a1e77 JH |
1642 | /* |
1643 | * Register an SSL index for the connection-specific ssl_dane structure. | |
1644 | * Using a separate index makes it possible to add DANE support to | |
1645 | * existing OpenSSL releases that don't have a suitable pointer in the | |
1646 | * SSL structure. | |
1647 | */ | |
1648 | dane_idx = SSL_get_ex_new_index(0, 0, 0, 0, 0); | |
e682570f TL |
1649 | } |
1650 | ||
946ecbe0 | 1651 | |
278293d3 | 1652 | #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER) |
3376de6c JH |
1653 | static void |
1654 | run_once(volatile int * once, void (*init)(void)) | |
1655 | { | |
1656 | int wlock = 0; | |
1657 | ||
1658 | CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); | |
1659 | if (!*once) | |
1660 | { | |
1661 | CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); | |
1662 | CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); | |
1663 | wlock = 1; | |
1664 | if (!*once) | |
1665 | { | |
1666 | *once = 1; | |
1667 | init(); | |
1668 | } | |
1669 | } | |
1670 | if (wlock) | |
1671 | CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); | |
1672 | else | |
1673 | CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); | |
1674 | } | |
1675 | #endif | |
1676 | ||
1677 | ||
946ecbe0 JH |
1678 | |
1679 | /* | |
1680 | ||
1681 | Call this once. Probably early in startup will do; may need | |
1682 | to be after SSL library init. | |
1683 | ||
043b1248 JH |
1684 | => put after call to tls_init() for now |
1685 | ||
1686 | Return | |
1687 | 1 Success | |
1688 | 0 Fail | |
946ecbe0 JH |
1689 | */ |
1690 | ||
880a1e77 JH |
1691 | int |
1692 | DANESSL_library_init(void) | |
e682570f | 1693 | { |
3376de6c JH |
1694 | static CRYPTO_ONCE once = CRYPTO_ONCE_STATIC_INIT; |
1695 | ||
6634ac8d | 1696 | DEBUG(D_tls) debug_printf("Dane lib-init\n"); |
3376de6c | 1697 | (void) CRYPTO_THREAD_run_once(&once, dane_init); |
e682570f TL |
1698 | |
1699 | #if defined(LN_sha256) | |
880a1e77 | 1700 | /* No DANE without SHA256 support */ |
aaba7d03 | 1701 | if (dane_idx >= 0 && EVP_get_digestbyname(LN_sha256) != 0) |
880a1e77 | 1702 | return 1; |
e682570f | 1703 | #endif |
aaba7d03 | 1704 | DANEerr(DANESSL_F_LIBRARY_INIT, DANESSL_R_SUPPORT); |
880a1e77 | 1705 | return 0; |
e682570f TL |
1706 | } |
1707 | ||
946ecbe0 | 1708 | |
880a1e77 JH |
1709 | /* vi: aw ai sw=2 |
1710 | */ |