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 | * |
1fbf41cd | 5 | * Copyright (c) The Exim Maintainers 2014 - 2019 |
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 |
1fbf41cd | 28 | |
c19ab167 KM |
29 | /* LibreSSL 2.9.0 and later - 2.9.0 has removed a number of macros ... */ |
30 | #ifdef LIBRESSL_VERSION_NUMBER | |
1fbf41cd JH |
31 | # if LIBRESSL_VERSION_NUMBER >= 0x2090000fL |
32 | # define EXIM_HAVE_ASN1_MACROS | |
33 | # endif | |
c19ab167 KM |
34 | #endif |
35 | /* OpenSSL */ | |
36 | #if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER) | |
37 | # define EXIM_HAVE_ASN1_MACROS | |
38 | # define EXIM_OPAQUE_X509 | |
39 | /* Older OpenSSL and all LibreSSL */ | |
40 | #else | |
41 | # define X509_STORE_CTX_get_verify(ctx) (ctx)->verify | |
42 | # define X509_STORE_CTX_get_verify_cb(ctx) (ctx)->verify_cb | |
43 | # define X509_STORE_CTX_get0_cert(ctx) (ctx)->cert | |
44 | # define X509_STORE_CTX_get0_chain(ctx) (ctx)->chain | |
45 | # define X509_STORE_CTX_get0_untrusted(ctx) (ctx)->untrusted | |
1fbf41cd | 46 | |
c19ab167 KM |
47 | # define X509_STORE_CTX_set_verify(ctx, verify_chain) (ctx)->verify = (verify_chain) |
48 | # define X509_STORE_CTX_set0_verified_chain(ctx, sk) (ctx)->chain = (sk) | |
49 | # define X509_STORE_CTX_set_error_depth(ctx, val) (ctx)->error_depth = (val) | |
50 | # define X509_STORE_CTX_set_current_cert(ctx, cert) (ctx)->current_cert = (cert) | |
1fbf41cd | 51 | |
c19ab167 KM |
52 | # define ASN1_STRING_get0_data ASN1_STRING_data |
53 | # define X509_getm_notBefore X509_get_notBefore | |
54 | # define X509_getm_notAfter X509_get_notAfter | |
1fbf41cd | 55 | |
c19ab167 KM |
56 | # define CRYPTO_ONCE_STATIC_INIT 0 |
57 | # define CRYPTO_THREAD_run_once run_once | |
3376de6c | 58 | typedef int CRYPTO_ONCE; |
c8dfb21d JH |
59 | #endif |
60 | ||
aaba7d03 | 61 | |
e682570f TL |
62 | #include "danessl.h" |
63 | ||
aaba7d03 VD |
64 | #define DANESSL_F_ADD_SKID 100 |
65 | #define DANESSL_F_ADD_TLSA 101 | |
66 | #define DANESSL_F_CHECK_END_ENTITY 102 | |
67 | #define DANESSL_F_CTX_INIT 103 | |
68 | #define DANESSL_F_GROW_CHAIN 104 | |
69 | #define DANESSL_F_INIT 105 | |
70 | #define DANESSL_F_LIBRARY_INIT 106 | |
71 | #define DANESSL_F_LIST_ALLOC 107 | |
72 | #define DANESSL_F_MATCH 108 | |
73 | #define DANESSL_F_PUSH_EXT 109 | |
74 | #define DANESSL_F_SET_TRUST_ANCHOR 110 | |
75 | #define DANESSL_F_VERIFY_CERT 111 | |
76 | #define DANESSL_F_WRAP_CERT 112 | |
3376de6c | 77 | #define DANESSL_F_DANESSL_VERIFY_CHAIN 113 |
aaba7d03 VD |
78 | |
79 | #define DANESSL_R_BAD_CERT 100 | |
80 | #define DANESSL_R_BAD_CERT_PKEY 101 | |
81 | #define DANESSL_R_BAD_DATA_LENGTH 102 | |
82 | #define DANESSL_R_BAD_DIGEST 103 | |
83 | #define DANESSL_R_BAD_NULL_DATA 104 | |
84 | #define DANESSL_R_BAD_PKEY 105 | |
85 | #define DANESSL_R_BAD_SELECTOR 106 | |
86 | #define DANESSL_R_BAD_USAGE 107 | |
87 | #define DANESSL_R_INIT 108 | |
88 | #define DANESSL_R_LIBRARY_INIT 109 | |
89 | #define DANESSL_R_NOSIGN_KEY 110 | |
90 | #define DANESSL_R_SCTX_INIT 111 | |
91 | #define DANESSL_R_SUPPORT 112 | |
e682570f TL |
92 | |
93 | #ifndef OPENSSL_NO_ERR | |
aaba7d03 VD |
94 | #define DANESSL_F_PLACEHOLDER 0 /* FIRST! Value TBD */ |
95 | static ERR_STRING_DATA dane_str_functs[] = { | |
f2ed27cf | 96 | /* error string */ |
aaba7d03 VD |
97 | {DANESSL_F_PLACEHOLDER, "DANE library"}, /* FIRST!!! */ |
98 | {DANESSL_F_ADD_SKID, "add_skid"}, | |
99 | {DANESSL_F_ADD_TLSA, "DANESSL_add_tlsa"}, | |
100 | {DANESSL_F_CHECK_END_ENTITY, "check_end_entity"}, | |
101 | {DANESSL_F_CTX_INIT, "DANESSL_CTX_init"}, | |
102 | {DANESSL_F_GROW_CHAIN, "grow_chain"}, | |
103 | {DANESSL_F_INIT, "DANESSL_init"}, | |
104 | {DANESSL_F_LIBRARY_INIT, "DANESSL_library_init"}, | |
105 | {DANESSL_F_LIST_ALLOC, "list_alloc"}, | |
106 | {DANESSL_F_MATCH, "match"}, | |
107 | {DANESSL_F_PUSH_EXT, "push_ext"}, | |
108 | {DANESSL_F_SET_TRUST_ANCHOR, "set_trust_anchor"}, | |
109 | {DANESSL_F_VERIFY_CERT, "verify_cert"}, | |
110 | {DANESSL_F_WRAP_CERT, "wrap_cert"}, | |
111 | {0, NULL} | |
e682570f | 112 | }; |
aaba7d03 | 113 | static ERR_STRING_DATA dane_str_reasons[] = { |
f2ed27cf | 114 | /* error string */ |
aaba7d03 VD |
115 | {DANESSL_R_BAD_CERT, "Bad TLSA record certificate"}, |
116 | {DANESSL_R_BAD_CERT_PKEY, "Bad TLSA record certificate public key"}, | |
117 | {DANESSL_R_BAD_DATA_LENGTH, "Bad TLSA record digest length"}, | |
118 | {DANESSL_R_BAD_DIGEST, "Bad TLSA record digest"}, | |
119 | {DANESSL_R_BAD_NULL_DATA, "Bad TLSA record null data"}, | |
120 | {DANESSL_R_BAD_PKEY, "Bad TLSA record public key"}, | |
121 | {DANESSL_R_BAD_SELECTOR, "Bad TLSA record selector"}, | |
122 | {DANESSL_R_BAD_USAGE, "Bad TLSA record usage"}, | |
123 | {DANESSL_R_INIT, "DANESSL_init() required"}, | |
124 | {DANESSL_R_LIBRARY_INIT, "DANESSL_library_init() required"}, | |
125 | {DANESSL_R_NOSIGN_KEY, "Certificate usage 2 requires EC support"}, | |
126 | {DANESSL_R_SCTX_INIT, "DANESSL_CTX_init() required"}, | |
127 | {DANESSL_R_SUPPORT, "DANE library features not supported"}, | |
128 | {0, NULL} | |
e682570f | 129 | }; |
aaba7d03 | 130 | #endif |
e682570f | 131 | |
f3ebb786 | 132 | #define DANEerr(f, r) ERR_PUT_error(err_lib_dane, (f), (r), __FUNCTION__, __LINE__) |
e682570f TL |
133 | |
134 | static int err_lib_dane = -1; | |
135 | static int dane_idx = -1; | |
136 | ||
137 | #ifdef X509_V_FLAG_PARTIAL_CHAIN /* OpenSSL >= 1.0.2 */ | |
138 | static int wrap_to_root = 0; | |
139 | #else | |
140 | static int wrap_to_root = 1; | |
141 | #endif | |
142 | ||
143 | static void (*cert_free)(void *) = (void (*)(void *)) X509_free; | |
144 | static void (*pkey_free)(void *) = (void (*)(void *)) EVP_PKEY_free; | |
145 | ||
880a1e77 JH |
146 | typedef struct dane_list |
147 | { | |
e682570f TL |
148 | struct dane_list *next; |
149 | void *value; | |
150 | } *dane_list; | |
151 | ||
152 | #define LINSERT(h, e) do { (e)->next = (h); (h) = (e); } while (0) | |
153 | ||
880a1e77 JH |
154 | typedef struct dane_host_list |
155 | { | |
156 | struct dane_host_list *next; | |
e682570f | 157 | char *value; |
880a1e77 | 158 | } *dane_host_list; |
e682570f | 159 | |
880a1e77 JH |
160 | typedef struct dane_data |
161 | { | |
e682570f TL |
162 | size_t datalen; |
163 | unsigned char data[0]; | |
164 | } *dane_data; | |
165 | ||
880a1e77 JH |
166 | typedef struct dane_data_list |
167 | { | |
168 | struct dane_data_list *next; | |
e682570f | 169 | dane_data value; |
880a1e77 | 170 | } *dane_data_list; |
e682570f | 171 | |
880a1e77 JH |
172 | typedef struct dane_mtype |
173 | { | |
e682570f TL |
174 | int mdlen; |
175 | const EVP_MD *md; | |
880a1e77 | 176 | dane_data_list data; |
e682570f TL |
177 | } *dane_mtype; |
178 | ||
880a1e77 JH |
179 | typedef struct dane_mtype_list |
180 | { | |
181 | struct dane_mtype_list *next; | |
e682570f | 182 | dane_mtype value; |
880a1e77 | 183 | } *dane_mtype_list; |
e682570f | 184 | |
880a1e77 JH |
185 | typedef struct dane_selector |
186 | { | |
e682570f | 187 | uint8_t selector; |
880a1e77 | 188 | dane_mtype_list mtype; |
e682570f TL |
189 | } *dane_selector; |
190 | ||
880a1e77 JH |
191 | typedef struct dane_selector_list |
192 | { | |
193 | struct dane_selector_list *next; | |
e682570f | 194 | dane_selector value; |
880a1e77 | 195 | } *dane_selector_list; |
e682570f | 196 | |
880a1e77 JH |
197 | typedef struct dane_pkey_list |
198 | { | |
199 | struct dane_pkey_list *next; | |
e682570f | 200 | EVP_PKEY *value; |
880a1e77 | 201 | } *dane_pkey_list; |
e682570f | 202 | |
880a1e77 JH |
203 | typedef struct dane_cert_list |
204 | { | |
205 | struct dane_cert_list *next; | |
e682570f | 206 | X509 *value; |
880a1e77 | 207 | } *dane_cert_list; |
e682570f | 208 | |
880a1e77 JH |
209 | typedef struct ssl_dane |
210 | { | |
e682570f TL |
211 | int (*verify)(X509_STORE_CTX *); |
212 | STACK_OF(X509) *roots; | |
213 | STACK_OF(X509) *chain; | |
aaba7d03 VD |
214 | X509 *match; /* Matched cert */ |
215 | const char *thost; /* TLSA base domain */ | |
216 | char *mhost; /* Matched peer name */ | |
880a1e77 JH |
217 | dane_pkey_list pkeys; |
218 | dane_cert_list certs; | |
219 | dane_host_list hosts; | |
aaba7d03 | 220 | dane_selector_list selectors[DANESSL_USAGE_LAST + 1]; |
e682570f | 221 | int depth; |
aaba7d03 VD |
222 | int mdpth; /* Depth of matched cert */ |
223 | int multi; /* Multi-label wildcards? */ | |
224 | int count; /* Number of TLSA records */ | |
880a1e77 | 225 | } ssl_dane; |
e682570f TL |
226 | |
227 | #ifndef X509_V_ERR_HOSTNAME_MISMATCH | |
880a1e77 | 228 | # define X509_V_ERR_HOSTNAME_MISMATCH X509_V_ERR_APPLICATION_VERIFICATION |
e682570f TL |
229 | #endif |
230 | ||
f2f2c91b JH |
231 | |
232 | ||
880a1e77 JH |
233 | static int |
234 | match(dane_selector_list slist, X509 *cert, int depth) | |
e682570f | 235 | { |
880a1e77 | 236 | int matched; |
e682570f | 237 | |
880a1e77 JH |
238 | /* |
239 | * Note, set_trust_anchor() needs to know whether the match was for a | |
240 | * pkey digest or a certificate digest. We return MATCHED_PKEY or | |
241 | * MATCHED_CERT accordingly. | |
242 | */ | |
aaba7d03 VD |
243 | #define MATCHED_CERT (DANESSL_SELECTOR_CERT + 1) |
244 | #define MATCHED_PKEY (DANESSL_SELECTOR_SPKI + 1) | |
e682570f | 245 | |
880a1e77 JH |
246 | /* |
247 | * Loop over each selector, mtype, and associated data element looking | |
248 | * for a match. | |
249 | */ | |
aaba7d03 | 250 | for (matched = 0; !matched && slist; slist = slist->next) |
880a1e77 | 251 | { |
880a1e77 | 252 | unsigned char mdbuf[EVP_MAX_MD_SIZE]; |
85098ee7 | 253 | unsigned char *buf = NULL; |
880a1e77 | 254 | unsigned char *buf2; |
85098ee7 | 255 | unsigned int len = 0; |
880a1e77 JH |
256 | |
257 | /* | |
258 | * Extract ASN.1 DER form of certificate or public key. | |
259 | */ | |
260 | switch(slist->value->selector) | |
261 | { | |
aaba7d03 | 262 | case DANESSL_SELECTOR_CERT: |
880a1e77 | 263 | len = i2d_X509(cert, NULL); |
5903c6ff | 264 | buf2 = buf = US OPENSSL_malloc(len); |
880a1e77 JH |
265 | if(buf) i2d_X509(cert, &buf2); |
266 | break; | |
aaba7d03 | 267 | case DANESSL_SELECTOR_SPKI: |
880a1e77 | 268 | len = i2d_X509_PUBKEY(X509_get_X509_PUBKEY(cert), NULL); |
5903c6ff | 269 | buf2 = buf = US OPENSSL_malloc(len); |
880a1e77 JH |
270 | if(buf) i2d_X509_PUBKEY(X509_get_X509_PUBKEY(cert), &buf2); |
271 | break; | |
272 | } | |
273 | ||
aaba7d03 | 274 | if (!buf) |
880a1e77 | 275 | { |
aaba7d03 | 276 | DANEerr(DANESSL_F_MATCH, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
277 | return 0; |
278 | } | |
279 | OPENSSL_assert(buf2 - buf == len); | |
280 | ||
281 | /* | |
282 | * Loop over each mtype and data element | |
283 | */ | |
d7978c0f | 284 | for (dane_mtype_list m = slist->value->mtype; !matched && m; m = m->next) |
880a1e77 | 285 | { |
880a1e77 JH |
286 | unsigned char *cmpbuf = buf; |
287 | unsigned int cmplen = len; | |
288 | ||
e682570f | 289 | /* |
880a1e77 JH |
290 | * If it is a digest, compute the corresponding digest of the |
291 | * DER data for comparison, otherwise, use the full object. | |
e682570f | 292 | */ |
aaba7d03 | 293 | if (m->value->md) |
880a1e77 JH |
294 | { |
295 | cmpbuf = mdbuf; | |
aaba7d03 | 296 | if (!EVP_Digest(buf, len, cmpbuf, &cmplen, m->value->md, 0)) |
880a1e77 JH |
297 | matched = -1; |
298 | } | |
d7978c0f | 299 | for (dane_data_list d = m->value->data; !matched && d; d = d->next) |
aaba7d03 VD |
300 | if ( cmplen == d->value->datalen |
301 | && memcmp(cmpbuf, d->value->data, cmplen) == 0) | |
880a1e77 | 302 | matched = slist->value->selector + 1; |
e682570f TL |
303 | } |
304 | ||
880a1e77 JH |
305 | OPENSSL_free(buf); |
306 | } | |
e682570f | 307 | |
880a1e77 | 308 | return matched; |
e682570f TL |
309 | } |
310 | ||
880a1e77 JH |
311 | static int |
312 | push_ext(X509 *cert, X509_EXTENSION *ext) | |
e682570f | 313 | { |
3376de6c JH |
314 | if (ext) |
315 | { | |
316 | if (X509_add_ext(cert, ext, -1)) | |
317 | return 1; | |
318 | X509_EXTENSION_free(ext); | |
319 | } | |
320 | DANEerr(DANESSL_F_PUSH_EXT, ERR_R_MALLOC_FAILURE); | |
321 | return 0; | |
e682570f TL |
322 | } |
323 | ||
880a1e77 JH |
324 | static int |
325 | add_ext(X509 *issuer, X509 *subject, int ext_nid, char *ext_val) | |
e682570f | 326 | { |
880a1e77 | 327 | X509V3_CTX v3ctx; |
e682570f | 328 | |
880a1e77 JH |
329 | X509V3_set_ctx(&v3ctx, issuer, subject, 0, 0, 0); |
330 | return push_ext(subject, X509V3_EXT_conf_nid(0, &v3ctx, ext_nid, ext_val)); | |
e682570f TL |
331 | } |
332 | ||
880a1e77 JH |
333 | static int |
334 | set_serial(X509 *cert, AUTHORITY_KEYID *akid, X509 *subject) | |
e682570f | 335 | { |
880a1e77 JH |
336 | int ret = 0; |
337 | BIGNUM *bn; | |
338 | ||
aaba7d03 | 339 | if (akid && akid->serial) |
880a1e77 JH |
340 | return (X509_set_serialNumber(cert, akid->serial)); |
341 | ||
342 | /* | |
343 | * Add one to subject's serial to avoid collisions between TA serial and | |
344 | * serial of signing root. | |
345 | */ | |
aaba7d03 VD |
346 | if ( (bn = ASN1_INTEGER_to_BN(X509_get_serialNumber(subject), 0)) != 0 |
347 | && BN_add_word(bn, 1) | |
348 | && BN_to_ASN1_INTEGER(bn, X509_get_serialNumber(cert))) | |
880a1e77 JH |
349 | ret = 1; |
350 | ||
aaba7d03 | 351 | if (bn) |
880a1e77 JH |
352 | BN_free(bn); |
353 | return ret; | |
354 | } | |
e682570f | 355 | |
880a1e77 JH |
356 | static int |
357 | add_akid(X509 *cert, AUTHORITY_KEYID *akid) | |
358 | { | |
359 | int nid = NID_authority_key_identifier; | |
3376de6c | 360 | ASN1_OCTET_STRING *id; |
880a1e77 JH |
361 | unsigned char c = 0; |
362 | int ret = 0; | |
363 | ||
364 | /* | |
365 | * 0 will never be our subject keyid from a SHA-1 hash, but it could be | |
366 | * our subject keyid if forced from child's akid. If so, set our | |
367 | * authority keyid to 1. This way we are never self-signed, and thus | |
368 | * exempt from any potential (off by default for now in OpenSSL) | |
369 | * self-signature checks! | |
370 | */ | |
3376de6c JH |
371 | id = akid && akid->keyid ? akid->keyid : 0; |
372 | if (id && ASN1_STRING_length(id) == 1 && *ASN1_STRING_get0_data(id) == c) | |
880a1e77 JH |
373 | c = 1; |
374 | ||
aaba7d03 VD |
375 | if ( (akid = AUTHORITY_KEYID_new()) != 0 |
376 | && (akid->keyid = ASN1_OCTET_STRING_new()) != 0 | |
c8dfb21d JH |
377 | #ifdef EXIM_HAVE_ASN1_MACROS |
378 | && ASN1_OCTET_STRING_set(akid->keyid, (void *) &c, 1) | |
379 | #else | |
aaba7d03 | 380 | && M_ASN1_OCTET_STRING_set(akid->keyid, (void *) &c, 1) |
c8dfb21d | 381 | #endif |
aaba7d03 | 382 | && X509_add1_ext_i2d(cert, nid, akid, 0, X509V3_ADD_APPEND)) |
880a1e77 | 383 | ret = 1; |
aaba7d03 | 384 | if (akid) |
880a1e77 JH |
385 | AUTHORITY_KEYID_free(akid); |
386 | return ret; | |
e682570f TL |
387 | } |
388 | ||
880a1e77 JH |
389 | static int |
390 | add_skid(X509 *cert, AUTHORITY_KEYID *akid) | |
e682570f | 391 | { |
880a1e77 | 392 | int nid = NID_subject_key_identifier; |
e682570f | 393 | |
aaba7d03 | 394 | if (!akid || !akid->keyid) |
880a1e77 JH |
395 | return add_ext(0, cert, nid, "hash"); |
396 | return X509_add1_ext_i2d(cert, nid, akid->keyid, 0, X509V3_ADD_APPEND) > 0; | |
e682570f TL |
397 | } |
398 | ||
880a1e77 JH |
399 | static X509_NAME * |
400 | akid_issuer_name(AUTHORITY_KEYID *akid) | |
e682570f | 401 | { |
aaba7d03 | 402 | if (akid && akid->issuer) |
880a1e77 | 403 | { |
880a1e77 | 404 | GENERAL_NAMES *gens = akid->issuer; |
e682570f | 405 | |
d7978c0f | 406 | for (int i = 0; i < sk_GENERAL_NAME_num(gens); ++i) |
880a1e77 JH |
407 | { |
408 | GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, i); | |
e682570f | 409 | |
aaba7d03 | 410 | if (gn->type == GEN_DIRNAME) |
880a1e77 | 411 | return (gn->d.dirn); |
e682570f | 412 | } |
880a1e77 JH |
413 | } |
414 | return 0; | |
e682570f TL |
415 | } |
416 | ||
880a1e77 | 417 | static int |
4f5830fe | 418 | set_issuer_name(X509 *cert, AUTHORITY_KEYID *akid, X509_NAME *subj) |
e682570f | 419 | { |
880a1e77 JH |
420 | X509_NAME *name = akid_issuer_name(akid); |
421 | ||
422 | /* | |
aded2255 | 423 | * If subject's akid specifies an authority key identifier issuer name, we |
880a1e77 JH |
424 | * must use that. |
425 | */ | |
426 | return X509_set_issuer_name(cert, | |
4f5830fe | 427 | name ? name : subj); |
e682570f TL |
428 | } |
429 | ||
880a1e77 JH |
430 | static int |
431 | grow_chain(ssl_dane *dane, int trusted, X509 *cert) | |
e682570f | 432 | { |
880a1e77 JH |
433 | STACK_OF(X509) **xs = trusted ? &dane->roots : &dane->chain; |
434 | static ASN1_OBJECT *serverAuth = 0; | |
e682570f TL |
435 | |
436 | #define UNTRUSTED 0 | |
437 | #define TRUSTED 1 | |
438 | ||
aaba7d03 VD |
439 | if ( trusted && !serverAuth |
440 | && !(serverAuth = OBJ_nid2obj(NID_server_auth))) | |
880a1e77 | 441 | { |
aaba7d03 | 442 | DANEerr(DANESSL_F_GROW_CHAIN, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
443 | return 0; |
444 | } | |
aaba7d03 | 445 | if (!*xs && !(*xs = sk_X509_new_null())) |
880a1e77 | 446 | { |
aaba7d03 | 447 | DANEerr(DANESSL_F_GROW_CHAIN, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
448 | return 0; |
449 | } | |
450 | ||
aaba7d03 | 451 | if (cert) |
880a1e77 | 452 | { |
aaba7d03 | 453 | if (trusted && !X509_add1_trust_object(cert, serverAuth)) |
880a1e77 | 454 | return 0; |
c8dfb21d JH |
455 | #ifdef EXIM_OPAQUE_X509 |
456 | X509_up_ref(cert); | |
457 | #else | |
880a1e77 | 458 | CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509); |
c8dfb21d | 459 | #endif |
880a1e77 JH |
460 | if (!sk_X509_push(*xs, cert)) |
461 | { | |
462 | X509_free(cert); | |
aaba7d03 | 463 | DANEerr(DANESSL_F_GROW_CHAIN, ERR_R_MALLOC_FAILURE); |
880a1e77 | 464 | return 0; |
e682570f | 465 | } |
880a1e77 JH |
466 | } |
467 | return 1; | |
e682570f TL |
468 | } |
469 | ||
880a1e77 JH |
470 | static int |
471 | wrap_issuer(ssl_dane *dane, EVP_PKEY *key, X509 *subject, int depth, int top) | |
e682570f | 472 | { |
880a1e77 JH |
473 | int ret = 1; |
474 | X509 *cert = 0; | |
475 | AUTHORITY_KEYID *akid; | |
476 | X509_NAME *name = X509_get_issuer_name(subject); | |
477 | EVP_PKEY *newkey = key ? key : X509_get_pubkey(subject); | |
e682570f TL |
478 | |
479 | #define WRAP_MID 0 /* Ensure intermediate. */ | |
480 | #define WRAP_TOP 1 /* Ensure self-signed. */ | |
481 | ||
aaba7d03 | 482 | if (!name || !newkey || !(cert = X509_new())) |
880a1e77 JH |
483 | return 0; |
484 | ||
485 | /* | |
486 | * Record the depth of the trust-anchor certificate. | |
487 | */ | |
aaba7d03 | 488 | if (dane->depth < 0) |
880a1e77 JH |
489 | dane->depth = depth + 1; |
490 | ||
491 | /* | |
492 | * XXX: Uncaught error condition: | |
493 | * | |
494 | * The return value is NULL both when the extension is missing, and when | |
495 | * OpenSSL rans out of memory while parsing the extension. | |
496 | */ | |
497 | ERR_clear_error(); | |
498 | akid = X509_get_ext_d2i(subject, NID_authority_key_identifier, 0, 0); | |
499 | /* XXX: Should we peek at the error stack here??? */ | |
500 | ||
501 | /* | |
502 | * If top is true generate a self-issued root CA, otherwise an | |
503 | * intermediate CA and possibly its self-signed issuer. | |
504 | * | |
505 | * CA cert valid for +/- 30 days | |
506 | */ | |
aaba7d03 VD |
507 | if ( !X509_set_version(cert, 2) |
508 | || !set_serial(cert, akid, subject) | |
4f5830fe | 509 | || !set_issuer_name(cert, akid, name) |
3376de6c JH |
510 | || !X509_gmtime_adj(X509_getm_notBefore(cert), -30 * 86400L) |
511 | || !X509_gmtime_adj(X509_getm_notAfter(cert), 30 * 86400L) | |
512 | || !X509_set_subject_name(cert, name) | |
aaba7d03 VD |
513 | || !X509_set_pubkey(cert, newkey) |
514 | || !add_ext(0, cert, NID_basic_constraints, "CA:TRUE") | |
515 | || (!top && !add_akid(cert, akid)) | |
516 | || !add_skid(cert, akid) | |
517 | || ( !top && wrap_to_root | |
518 | && !wrap_issuer(dane, newkey, cert, depth, WRAP_TOP))) | |
880a1e77 JH |
519 | ret = 0; |
520 | ||
aaba7d03 | 521 | if (akid) |
880a1e77 | 522 | AUTHORITY_KEYID_free(akid); |
aaba7d03 | 523 | if (!key) |
880a1e77 | 524 | EVP_PKEY_free(newkey); |
aaba7d03 | 525 | if (ret) |
880a1e77 | 526 | ret = grow_chain(dane, !top && wrap_to_root ? UNTRUSTED : TRUSTED, cert); |
aaba7d03 | 527 | if (cert) |
880a1e77 JH |
528 | X509_free(cert); |
529 | return ret; | |
e682570f TL |
530 | } |
531 | ||
880a1e77 JH |
532 | static int |
533 | wrap_cert(ssl_dane *dane, X509 *tacert, int depth) | |
e682570f | 534 | { |
aaba7d03 | 535 | if (dane->depth < 0) |
880a1e77 JH |
536 | dane->depth = depth + 1; |
537 | ||
538 | /* | |
539 | * If the TA certificate is self-issued, or need not be, use it directly. | |
4c04137d | 540 | * Otherwise, synthesize requisite ancestors. |
880a1e77 | 541 | */ |
aaba7d03 VD |
542 | if ( !wrap_to_root |
543 | || X509_check_issued(tacert, tacert) == X509_V_OK) | |
880a1e77 JH |
544 | return grow_chain(dane, TRUSTED, tacert); |
545 | ||
aaba7d03 | 546 | if (wrap_issuer(dane, 0, tacert, depth, WRAP_MID)) |
880a1e77 JH |
547 | return grow_chain(dane, UNTRUSTED, tacert); |
548 | return 0; | |
e682570f TL |
549 | } |
550 | ||
880a1e77 JH |
551 | static int |
552 | ta_signed(ssl_dane *dane, X509 *cert, int depth) | |
e682570f | 553 | { |
880a1e77 JH |
554 | EVP_PKEY *pk; |
555 | int done = 0; | |
556 | ||
557 | /* | |
558 | * First check whether issued and signed by a TA cert, this is cheaper | |
559 | * than the bare-public key checks below, since we can determine whether | |
560 | * the candidate TA certificate issued the certificate to be checked | |
561 | * first (name comparisons), before we bother with signature checks | |
562 | * (public key operations). | |
563 | */ | |
d7978c0f | 564 | for (dane_cert_list x = dane->certs; !done && x; x = x->next) |
880a1e77 | 565 | { |
aaba7d03 | 566 | if (X509_check_issued(x->value, cert) == X509_V_OK) |
880a1e77 | 567 | { |
aaba7d03 | 568 | if (!(pk = X509_get_pubkey(x->value))) |
880a1e77 JH |
569 | { |
570 | /* | |
571 | * The cert originally contained a valid pkey, which does | |
572 | * not just vanish, so this is most likely a memory error. | |
573 | */ | |
574 | done = -1; | |
575 | break; | |
576 | } | |
577 | /* Check signature, since some other TA may work if not this. */ | |
aaba7d03 | 578 | if (X509_verify(cert, pk) > 0) |
880a1e77 JH |
579 | done = wrap_cert(dane, x->value, depth) ? 1 : -1; |
580 | EVP_PKEY_free(pk); | |
e682570f | 581 | } |
880a1e77 JH |
582 | } |
583 | ||
584 | /* | |
585 | * With bare TA public keys, we can't check whether the trust chain is | |
586 | * issued by the key, but we can determine whether it is signed by the | |
587 | * key, so we go with that. | |
588 | * | |
589 | * Ideally, the corresponding certificate was presented in the chain, and we | |
590 | * matched it by its public key digest one level up. This code is here | |
591 | * to handle adverse conditions imposed by sloppy administrators of | |
592 | * receiving systems with poorly constructed chains. | |
593 | * | |
594 | * We'd like to optimize out keys that should not match when the cert's | |
595 | * authority key id does not match the key id of this key computed via | |
596 | * the RFC keyid algorithm (SHA-1 digest of public key bit-string sans | |
597 | * ASN1 tag and length thus also excluding the unused bits field that is | |
598 | * logically part of the length). However, some CAs have a non-standard | |
599 | * authority keyid, so we lose. Too bad. | |
600 | * | |
601 | * This may push errors onto the stack when the certificate signature is | |
602 | * not of the right type or length, throw these away, | |
603 | */ | |
d7978c0f | 604 | for (dane_pkey_list k = dane->pkeys; !done && k; k = k->next) |
aaba7d03 | 605 | if (X509_verify(cert, k->value) > 0) |
880a1e77 JH |
606 | done = wrap_issuer(dane, k->value, cert, depth, WRAP_MID) ? 1 : -1; |
607 | else | |
608 | ERR_clear_error(); | |
e682570f | 609 | |
880a1e77 | 610 | return done; |
e682570f TL |
611 | } |
612 | ||
880a1e77 JH |
613 | static int |
614 | set_trust_anchor(X509_STORE_CTX *ctx, ssl_dane *dane, X509 *cert) | |
e682570f | 615 | { |
880a1e77 | 616 | int matched = 0; |
880a1e77 JH |
617 | int depth = 0; |
618 | EVP_PKEY *takey; | |
619 | X509 *ca; | |
e3555426 | 620 | STACK_OF(X509) *in = X509_STORE_CTX_get0_untrusted(ctx); |
880a1e77 | 621 | |
aaba7d03 | 622 | if (!grow_chain(dane, UNTRUSTED, 0)) |
880a1e77 JH |
623 | return -1; |
624 | ||
625 | /* | |
626 | * Accept a degenerate case: depth 0 self-signed trust-anchor. | |
627 | */ | |
aaba7d03 | 628 | if (X509_check_issued(cert, cert) == X509_V_OK) |
880a1e77 JH |
629 | { |
630 | dane->depth = 0; | |
aaba7d03 VD |
631 | matched = match(dane->selectors[DANESSL_USAGE_DANE_TA], cert, 0); |
632 | if (matched > 0 && !grow_chain(dane, TRUSTED, cert)) | |
880a1e77 JH |
633 | matched = -1; |
634 | return matched; | |
635 | } | |
636 | ||
637 | /* Make a shallow copy of the input untrusted chain. */ | |
aaba7d03 | 638 | if (!(in = sk_X509_dup(in))) |
880a1e77 | 639 | { |
aaba7d03 | 640 | DANEerr(DANESSL_F_SET_TRUST_ANCHOR, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
641 | return -1; |
642 | } | |
643 | ||
644 | /* | |
645 | * At each iteration we consume the issuer of the current cert. This | |
646 | * reduces the length of the "in" chain by one. If no issuer is found, | |
647 | * we are done. We also stop when a certificate matches a TA in the | |
648 | * peer's TLSA RRset. | |
649 | * | |
650 | * Caller ensures that the initial certificate is not self-signed. | |
651 | */ | |
d7978c0f | 652 | for (int n = sk_X509_num(in); n > 0; --n, ++depth) |
880a1e77 | 653 | { |
d7978c0f | 654 | int i; |
aaba7d03 VD |
655 | for (i = 0; i < n; ++i) |
656 | if (X509_check_issued(sk_X509_value(in, i), cert) == X509_V_OK) | |
880a1e77 JH |
657 | break; |
658 | ||
659 | /* | |
660 | * Final untrusted element with no issuer in the peer's chain, it may | |
661 | * however be signed by a pkey or cert obtained via a TLSA RR. | |
662 | */ | |
aaba7d03 | 663 | if (i == n) |
880a1e77 JH |
664 | break; |
665 | ||
666 | /* Peer's chain contains an issuer ca. */ | |
667 | ca = sk_X509_delete(in, i); | |
668 | ||
669 | /* If not a trust anchor, record untrusted ca and continue. */ | |
aaba7d03 VD |
670 | if ((matched = match(dane->selectors[DANESSL_USAGE_DANE_TA], ca, |
671 | depth + 1)) == 0) | |
880a1e77 | 672 | { |
aaba7d03 | 673 | if (grow_chain(dane, UNTRUSTED, ca)) |
880a1e77 | 674 | { |
a1ffb971 | 675 | if (X509_check_issued(ca, ca) != X509_V_OK) |
880a1e77 JH |
676 | { |
677 | /* Restart with issuer as subject */ | |
678 | cert = ca; | |
679 | continue; | |
680 | } | |
681 | /* Final self-signed element, skip ta_signed() check. */ | |
682 | cert = 0; | |
683 | } | |
684 | else | |
685 | matched = -1; | |
e682570f | 686 | } |
880a1e77 JH |
687 | else if(matched == MATCHED_CERT) |
688 | { | |
689 | if(!wrap_cert(dane, ca, depth)) | |
690 | matched = -1; | |
e682570f | 691 | } |
880a1e77 JH |
692 | else if(matched == MATCHED_PKEY) |
693 | { | |
aaba7d03 VD |
694 | if ( !(takey = X509_get_pubkey(ca)) |
695 | || !wrap_issuer(dane, takey, cert, depth, WRAP_MID)) | |
880a1e77 | 696 | { |
aaba7d03 | 697 | if (takey) |
880a1e77 JH |
698 | EVP_PKEY_free(takey); |
699 | else | |
aaba7d03 | 700 | DANEerr(DANESSL_F_SET_TRUST_ANCHOR, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
701 | matched = -1; |
702 | } | |
e682570f | 703 | } |
880a1e77 JH |
704 | break; |
705 | } | |
e682570f | 706 | |
880a1e77 JH |
707 | /* Shallow free the duplicated input untrusted chain. */ |
708 | sk_X509_free(in); | |
e682570f | 709 | |
880a1e77 JH |
710 | /* |
711 | * When the loop exits, if "cert" is set, it is not self-signed and has | |
712 | * no issuer in the chain, we check for a possible signature via a DNS | |
713 | * obtained TA cert or public key. | |
714 | */ | |
aaba7d03 | 715 | if (matched == 0 && cert) |
880a1e77 | 716 | matched = ta_signed(dane, cert, depth); |
e682570f | 717 | |
880a1e77 | 718 | return matched; |
e682570f TL |
719 | } |
720 | ||
880a1e77 JH |
721 | static int |
722 | check_end_entity(X509_STORE_CTX *ctx, ssl_dane *dane, X509 *cert) | |
e682570f | 723 | { |
880a1e77 JH |
724 | int matched; |
725 | ||
aaba7d03 VD |
726 | matched = match(dane->selectors[DANESSL_USAGE_DANE_EE], cert, 0); |
727 | if (matched > 0) | |
728 | { | |
729 | dane->mdpth = 0; | |
730 | dane->match = cert; | |
731 | X509_up_ref(cert); | |
e3555426 | 732 | if(!X509_STORE_CTX_get0_chain(ctx)) |
85098ee7 | 733 | { |
e3555426 JH |
734 | STACK_OF(X509) * sk = sk_X509_new_null(); |
735 | if (sk && sk_X509_push(sk, cert)) | |
736 | { | |
aaba7d03 | 737 | X509_up_ref(cert); |
3376de6c | 738 | X509_STORE_CTX_set0_verified_chain(ctx, sk); |
e3555426 | 739 | } |
880a1e77 JH |
740 | else |
741 | { | |
3376de6c | 742 | if (sk) sk_X509_free(sk); |
aaba7d03 | 743 | DANEerr(DANESSL_F_CHECK_END_ENTITY, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
744 | return -1; |
745 | } | |
85098ee7 | 746 | } |
aaba7d03 | 747 | } |
880a1e77 | 748 | return matched; |
e682570f TL |
749 | } |
750 | ||
880a1e77 JH |
751 | static int |
752 | match_name(const char *certid, ssl_dane *dane) | |
e682570f | 753 | { |
880a1e77 | 754 | int multi = dane->multi; |
880a1e77 | 755 | |
d7978c0f | 756 | for (dane_host_list hosts = dane->hosts; hosts; hosts = hosts->next) |
880a1e77 JH |
757 | { |
758 | int match_subdomain = 0; | |
759 | const char *domain = hosts->value; | |
760 | const char *parent; | |
761 | int idlen; | |
762 | int domlen; | |
763 | ||
aaba7d03 | 764 | if (*domain == '.' && domain[1] != '\0') |
880a1e77 JH |
765 | { |
766 | ++domain; | |
767 | match_subdomain = 1; | |
e682570f | 768 | } |
880a1e77 JH |
769 | |
770 | /* | |
771 | * Sub-domain match: certid is any sub-domain of hostname. | |
772 | */ | |
773 | if(match_subdomain) | |
85098ee7 | 774 | { |
aaba7d03 VD |
775 | if ( (idlen = strlen(certid)) > (domlen = strlen(domain)) + 1 |
776 | && certid[idlen - domlen - 1] == '.' | |
777 | && !strcasecmp(certid + (idlen - domlen), domain)) | |
880a1e77 JH |
778 | return 1; |
779 | else | |
780 | continue; | |
85098ee7 | 781 | } |
880a1e77 JH |
782 | |
783 | /* | |
784 | * Exact match and initial "*" match. The initial "*" in a certid | |
785 | * matches one (if multi is false) or more hostname components under | |
786 | * the condition that the certid contains multiple hostname components. | |
787 | */ | |
aaba7d03 VD |
788 | if ( !strcasecmp(certid, domain) |
789 | || ( certid[0] == '*' && certid[1] == '.' && certid[2] != 0 | |
790 | && (parent = strchr(domain, '.')) != 0 | |
791 | && (idlen = strlen(certid + 1)) <= (domlen = strlen(parent)) | |
792 | && strcasecmp(multi ? parent + domlen - idlen : parent, certid+1) == 0)) | |
880a1e77 JH |
793 | return 1; |
794 | } | |
795 | return 0; | |
e682570f TL |
796 | } |
797 | ||
3376de6c JH |
798 | static const char * |
799 | check_name(const char *name, int len) | |
e682570f | 800 | { |
3376de6c | 801 | const char *cp = name + len; |
880a1e77 | 802 | |
aaba7d03 | 803 | while (len > 0 && !*--cp) |
880a1e77 | 804 | --len; /* Ignore trailing NULs */ |
aaba7d03 | 805 | if (len <= 0) |
880a1e77 | 806 | return 0; |
aaba7d03 | 807 | for (cp = name; *cp; cp++) |
880a1e77 JH |
808 | { |
809 | char c = *cp; | |
810 | if (!((c >= 'a' && c <= 'z') || | |
811 | (c >= '0' && c <= '9') || | |
812 | (c >= 'A' && c <= 'Z') || | |
813 | (c == '.' || c == '-') || | |
814 | (c == '*'))) | |
815 | return 0; /* Only LDH, '.' and '*' */ | |
816 | } | |
aaba7d03 | 817 | if (cp - name != len) /* Guard against internal NULs */ |
880a1e77 JH |
818 | return 0; |
819 | return name; | |
e682570f TL |
820 | } |
821 | ||
3376de6c | 822 | static const char * |
880a1e77 | 823 | parse_dns_name(const GENERAL_NAME *gn) |
e682570f | 824 | { |
aaba7d03 | 825 | if (gn->type != GEN_DNS) |
880a1e77 | 826 | return 0; |
aaba7d03 | 827 | if (ASN1_STRING_type(gn->d.ia5) != V_ASN1_IA5STRING) |
880a1e77 | 828 | return 0; |
5903c6ff | 829 | return check_name(CCS ASN1_STRING_get0_data(gn->d.ia5), |
880a1e77 | 830 | ASN1_STRING_length(gn->d.ia5)); |
e682570f TL |
831 | } |
832 | ||
880a1e77 JH |
833 | static char * |
834 | parse_subject_name(X509 *cert) | |
e682570f | 835 | { |
880a1e77 JH |
836 | X509_NAME *name = X509_get_subject_name(cert); |
837 | X509_NAME_ENTRY *entry; | |
838 | ASN1_STRING *entry_str; | |
839 | unsigned char *namebuf; | |
840 | int nid = NID_commonName; | |
841 | int len; | |
842 | int i; | |
843 | ||
aaba7d03 | 844 | if (!name || (i = X509_NAME_get_index_by_NID(name, nid, -1)) < 0) |
880a1e77 | 845 | return 0; |
aaba7d03 | 846 | if (!(entry = X509_NAME_get_entry(name, i))) |
880a1e77 | 847 | return 0; |
aaba7d03 | 848 | if (!(entry_str = X509_NAME_ENTRY_get_data(entry))) |
880a1e77 JH |
849 | return 0; |
850 | ||
aaba7d03 | 851 | if ((len = ASN1_STRING_to_UTF8(&namebuf, entry_str)) < 0) |
880a1e77 | 852 | return 0; |
5903c6ff | 853 | if (len <= 0 || check_name(CS namebuf, len) == 0) |
880a1e77 JH |
854 | { |
855 | OPENSSL_free(namebuf); | |
856 | return 0; | |
857 | } | |
5903c6ff | 858 | return CS namebuf; |
e682570f TL |
859 | } |
860 | ||
880a1e77 JH |
861 | static int |
862 | name_check(ssl_dane *dane, X509 *cert) | |
e682570f | 863 | { |
880a1e77 JH |
864 | int matched = 0; |
865 | BOOL got_altname = FALSE; | |
866 | GENERAL_NAMES *gens; | |
867 | ||
868 | gens = X509_get_ext_d2i(cert, NID_subject_alt_name, 0, 0); | |
aaba7d03 | 869 | if (gens) |
880a1e77 JH |
870 | { |
871 | int n = sk_GENERAL_NAME_num(gens); | |
880a1e77 | 872 | |
d7978c0f | 873 | for (int i = 0; i < n; ++i) |
880a1e77 JH |
874 | { |
875 | const GENERAL_NAME *gn = sk_GENERAL_NAME_value(gens, i); | |
876 | const char *certid; | |
877 | ||
aaba7d03 | 878 | if (gn->type != GEN_DNS) |
880a1e77 JH |
879 | continue; |
880 | got_altname = TRUE; | |
881 | certid = parse_dns_name(gn); | |
aaba7d03 | 882 | if (certid && *certid) |
880a1e77 | 883 | { |
aaba7d03 | 884 | if ((matched = match_name(certid, dane)) == 0) |
880a1e77 | 885 | continue; |
aaba7d03 | 886 | if (!(dane->mhost = OPENSSL_strdup(certid))) |
880a1e77 | 887 | matched = -1; |
f2f2c91b | 888 | DEBUG(D_tls) debug_printf("Dane name_check: matched SAN %s\n", certid); |
880a1e77 JH |
889 | break; |
890 | } | |
e682570f | 891 | } |
880a1e77 JH |
892 | GENERAL_NAMES_free(gens); |
893 | } | |
894 | ||
895 | /* | |
896 | * XXX: Should the subjectName be skipped when *any* altnames are present, | |
897 | * or only when DNS altnames are present? | |
898 | */ | |
f2f2c91b | 899 | if (!got_altname) |
880a1e77 JH |
900 | { |
901 | char *certid = parse_subject_name(cert); | |
f2f2c91b JH |
902 | if (certid != 0 && *certid && (matched = match_name(certid, dane)) != 0) |
903 | { | |
904 | DEBUG(D_tls) debug_printf("Dane name_check: matched SN %s\n", certid); | |
aaba7d03 | 905 | dane->mhost = OPENSSL_strdup(certid); |
f2f2c91b JH |
906 | } |
907 | if (certid) | |
908 | OPENSSL_free(certid); | |
880a1e77 JH |
909 | } |
910 | return matched; | |
e682570f TL |
911 | } |
912 | ||
880a1e77 JH |
913 | static int |
914 | verify_chain(X509_STORE_CTX *ctx) | |
e682570f | 915 | { |
e3555426 JH |
916 | int (*cb)(int, X509_STORE_CTX *) = X509_STORE_CTX_get_verify_cb(ctx); |
917 | X509 *cert = X509_STORE_CTX_get0_cert(ctx); | |
3376de6c JH |
918 | STACK_OF(X509) * chain = X509_STORE_CTX_get0_chain(ctx); |
919 | int chain_length = sk_X509_num(chain); | |
880a1e77 JH |
920 | int ssl_idx = SSL_get_ex_data_X509_STORE_CTX_idx(); |
921 | SSL *ssl = X509_STORE_CTX_get_ex_data(ctx, ssl_idx); | |
922 | ssl_dane *dane = SSL_get_ex_data(ssl, dane_idx); | |
e3555426 JH |
923 | dane_selector_list issuer_rrs = dane->selectors[DANESSL_USAGE_PKIX_TA]; |
924 | dane_selector_list leaf_rrs = dane->selectors[DANESSL_USAGE_PKIX_EE]; | |
880a1e77 | 925 | int matched = 0; |
880a1e77 | 926 | |
f2f2c91b | 927 | DEBUG(D_tls) debug_printf("Dane verify_chain\n"); |
6634ac8d | 928 | |
3376de6c | 929 | /* Restore OpenSSL's internal_verify() as the signature check function */ |
e3555426 | 930 | X509_STORE_CTX_set_verify(ctx, dane->verify); |
880a1e77 | 931 | |
aaba7d03 | 932 | if ((matched = name_check(dane, cert)) < 0) |
880a1e77 JH |
933 | { |
934 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_OUT_OF_MEM); | |
935 | return 0; | |
936 | } | |
937 | ||
aaba7d03 | 938 | if (!matched) |
880a1e77 | 939 | { |
e3555426 JH |
940 | X509_STORE_CTX_set_error_depth(ctx, 0); |
941 | X509_STORE_CTX_set_current_cert(ctx, cert); | |
880a1e77 | 942 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH); |
aaba7d03 | 943 | if (!cb(0, ctx)) |
880a1e77 JH |
944 | return 0; |
945 | } | |
946 | matched = 0; | |
947 | ||
f2f2c91b JH |
948 | /* |
949 | * Satisfy at least one usage 0 or 1 constraint, unless we've already | |
950 | * matched a usage 2 trust anchor. | |
951 | * | |
952 | * XXX: internal_verify() doesn't callback with top certs that are not | |
3376de6c | 953 | * self-issued. This is fixed in OpenSSL 1.1.0. |
f2f2c91b JH |
954 | */ |
955 | if (dane->roots && sk_X509_num(dane->roots)) | |
956 | { | |
3376de6c | 957 | X509 *top = sk_X509_value(chain, dane->depth); |
880a1e77 | 958 | |
f2f2c91b JH |
959 | dane->mdpth = dane->depth; |
960 | dane->match = top; | |
961 | X509_up_ref(top); | |
aaba7d03 | 962 | |
3376de6c | 963 | #if OPENSSL_VERSION_NUMBER < 0x10100000L |
f2f2c91b JH |
964 | if (X509_check_issued(top, top) != X509_V_OK) |
965 | { | |
e3555426 JH |
966 | X509_STORE_CTX_set_error_depth(ctx, dane->depth); |
967 | X509_STORE_CTX_set_current_cert(ctx, top); | |
f2f2c91b JH |
968 | if (!cb(1, ctx)) |
969 | return 0; | |
970 | } | |
880a1e77 JH |
971 | #endif |
972 | /* Pop synthetic trust-anchor ancestors off the chain! */ | |
973 | while (--chain_length > dane->depth) | |
3376de6c | 974 | X509_free(sk_X509_pop(chain)); |
880a1e77 | 975 | } |
aaba7d03 | 976 | else |
880a1e77 | 977 | { |
aaba7d03 VD |
978 | int n = 0; |
979 | X509 *xn = cert; | |
880a1e77 JH |
980 | |
981 | /* | |
982 | * Check for an EE match, then a CA match at depths > 0, and | |
983 | * finally, if the EE cert is self-issued, for a depth 0 CA match. | |
984 | */ | |
aaba7d03 VD |
985 | if (leaf_rrs) |
986 | matched = match(leaf_rrs, xn, 0); | |
f2f2c91b | 987 | if (matched) DEBUG(D_tls) debug_printf("Dane verify_chain: matched EE\n"); |
880a1e77 | 988 | |
f92c5522 VD |
989 | if (!matched && issuer_rrs) |
990 | for (n = chain_length-1; !matched && n >= 0; --n) | |
aaba7d03 | 991 | { |
3376de6c | 992 | xn = sk_X509_value(chain, n); |
f92c5522 VD |
993 | if (n > 0 || X509_check_issued(xn, xn) == X509_V_OK) |
994 | matched = match(issuer_rrs, xn, n); | |
aaba7d03 | 995 | } |
f2f2c91b JH |
996 | if (matched) DEBUG(D_tls) debug_printf("Dane verify_chain: matched %s\n", |
997 | n>0 ? "CA" : "selfisssued EE"); | |
f92c5522 VD |
998 | |
999 | if (!matched) | |
1000 | { | |
e3555426 JH |
1001 | X509_STORE_CTX_set_error_depth(ctx, 0); |
1002 | X509_STORE_CTX_set_current_cert(ctx, cert); | |
f92c5522 VD |
1003 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_CERT_UNTRUSTED); |
1004 | if (!cb(0, ctx)) | |
1005 | return 0; | |
1006 | } | |
1007 | else | |
1008 | { | |
1009 | dane->mdpth = n; | |
1010 | dane->match = xn; | |
1011 | X509_up_ref(xn); | |
e682570f | 1012 | } |
f92c5522 | 1013 | } |
e682570f | 1014 | |
3376de6c JH |
1015 | /* Tail recurse into OpenSSL's internal_verify */ |
1016 | return dane->verify(ctx); | |
aaba7d03 | 1017 | } |
e682570f | 1018 | |
aaba7d03 VD |
1019 | static void |
1020 | dane_reset(ssl_dane *dane) | |
1021 | { | |
1022 | dane->depth = -1; | |
1023 | if (dane->mhost) | |
1024 | { | |
1025 | OPENSSL_free(dane->mhost); | |
1026 | dane->mhost = 0; | |
880a1e77 | 1027 | } |
aaba7d03 VD |
1028 | if (dane->roots) |
1029 | { | |
1030 | sk_X509_pop_free(dane->roots, X509_free); | |
1031 | dane->roots = 0; | |
1032 | } | |
1033 | if (dane->chain) | |
1034 | { | |
1035 | sk_X509_pop_free(dane->chain, X509_free); | |
1036 | dane->chain = 0; | |
1037 | } | |
1038 | if (dane->match) | |
1039 | { | |
1040 | X509_free(dane->match); | |
1041 | dane->match = 0; | |
1042 | } | |
1043 | dane->mdpth = -1; | |
e682570f TL |
1044 | } |
1045 | ||
880a1e77 JH |
1046 | static int |
1047 | verify_cert(X509_STORE_CTX *ctx, void *unused_ctx) | |
e682570f | 1048 | { |
880a1e77 JH |
1049 | static int ssl_idx = -1; |
1050 | SSL *ssl; | |
1051 | ssl_dane *dane; | |
e3555426 JH |
1052 | int (*cb)(int, X509_STORE_CTX *) = X509_STORE_CTX_get_verify_cb(ctx); |
1053 | X509 *cert = X509_STORE_CTX_get0_cert(ctx); | |
880a1e77 | 1054 | int matched; |
880a1e77 | 1055 | |
f2f2c91b | 1056 | DEBUG(D_tls) debug_printf("Dane verify_cert\n"); |
6634ac8d | 1057 | |
aaba7d03 | 1058 | if (ssl_idx < 0) |
880a1e77 | 1059 | ssl_idx = SSL_get_ex_data_X509_STORE_CTX_idx(); |
aaba7d03 | 1060 | if (dane_idx < 0) |
880a1e77 | 1061 | { |
aaba7d03 | 1062 | DANEerr(DANESSL_F_VERIFY_CERT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1063 | return -1; |
1064 | } | |
1065 | ||
1066 | ssl = X509_STORE_CTX_get_ex_data(ctx, ssl_idx); | |
aaba7d03 | 1067 | if (!(dane = SSL_get_ex_data(ssl, dane_idx)) || !cert) |
880a1e77 JH |
1068 | return X509_verify_cert(ctx); |
1069 | ||
f2f2c91b | 1070 | /* Reset for verification of a new chain, perhaps a renegotiation. */ |
aaba7d03 VD |
1071 | dane_reset(dane); |
1072 | ||
1073 | if (dane->selectors[DANESSL_USAGE_DANE_EE]) | |
880a1e77 | 1074 | { |
aaba7d03 | 1075 | if ((matched = check_end_entity(ctx, dane, cert)) > 0) |
880a1e77 | 1076 | { |
e3555426 JH |
1077 | X509_STORE_CTX_set_error_depth(ctx, 0); |
1078 | X509_STORE_CTX_set_current_cert(ctx, cert); | |
880a1e77 | 1079 | return cb(1, ctx); |
e682570f | 1080 | } |
aaba7d03 | 1081 | if (matched < 0) |
880a1e77 JH |
1082 | { |
1083 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_OUT_OF_MEM); | |
1084 | return -1; | |
e682570f | 1085 | } |
880a1e77 | 1086 | } |
e682570f | 1087 | |
dc8380bb JH |
1088 | if (dane->selectors[DANESSL_USAGE_DANE_TA]) |
1089 | { | |
1090 | if ((matched = set_trust_anchor(ctx, dane, cert)) < 0) | |
880a1e77 | 1091 | { |
dc8380bb JH |
1092 | X509_STORE_CTX_set_error(ctx, X509_V_ERR_OUT_OF_MEM); |
1093 | return -1; | |
880a1e77 | 1094 | } |
dc8380bb JH |
1095 | if (matched) |
1096 | { | |
1097 | /* | |
1098 | * Check that setting the untrusted chain updates the expected | |
1099 | * structure member at the expected offset. | |
1100 | */ | |
1101 | X509_STORE_CTX_trusted_stack(ctx, dane->roots); | |
1102 | X509_STORE_CTX_set_chain(ctx, dane->chain); | |
1103 | OPENSSL_assert(dane->chain == X509_STORE_CTX_get0_untrusted(ctx)); | |
1104 | } | |
1105 | } | |
e682570f | 1106 | |
dc8380bb JH |
1107 | /* |
1108 | * Name checks and usage 0/1 constraint enforcement are delayed until | |
1109 | * X509_verify_cert() builds the full chain and calls our verify_chain() | |
1110 | * wrapper. | |
1111 | */ | |
1112 | dane->verify = X509_STORE_CTX_get_verify(ctx); | |
1113 | X509_STORE_CTX_set_verify(ctx, verify_chain); | |
aaba7d03 | 1114 | |
dc8380bb JH |
1115 | if (X509_verify_cert(ctx)) |
1116 | return 1; | |
880a1e77 | 1117 | |
dc8380bb JH |
1118 | /* |
1119 | * If the chain is invalid, clear any matching cert or hostname, to | |
1120 | * protect callers that might erroneously rely on these alone without | |
1121 | * checking the validation status. | |
1122 | */ | |
1123 | if (dane->match) | |
1124 | { | |
1125 | X509_free(dane->match); | |
1126 | dane->match = 0; | |
1127 | } | |
1128 | if (dane->mhost) | |
1129 | { | |
1130 | OPENSSL_free(dane->mhost); | |
1131 | dane->mhost = 0; | |
1132 | } | |
1133 | return 0; | |
e682570f TL |
1134 | } |
1135 | ||
880a1e77 JH |
1136 | static dane_list |
1137 | list_alloc(size_t vsize) | |
e682570f | 1138 | { |
880a1e77 JH |
1139 | void *value = (void *) OPENSSL_malloc(vsize); |
1140 | dane_list l; | |
1141 | ||
aaba7d03 | 1142 | if (!value) |
880a1e77 | 1143 | { |
aaba7d03 | 1144 | DANEerr(DANESSL_F_LIST_ALLOC, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1145 | return 0; |
1146 | } | |
aaba7d03 | 1147 | if (!(l = (dane_list) OPENSSL_malloc(sizeof(*l)))) |
880a1e77 JH |
1148 | { |
1149 | OPENSSL_free(value); | |
aaba7d03 | 1150 | DANEerr(DANESSL_F_LIST_ALLOC, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1151 | return 0; |
1152 | } | |
1153 | l->next = 0; | |
1154 | l->value = value; | |
1155 | return l; | |
e682570f TL |
1156 | } |
1157 | ||
880a1e77 JH |
1158 | static void |
1159 | list_free(void *list, void (*f)(void *)) | |
e682570f | 1160 | { |
880a1e77 JH |
1161 | dane_list next; |
1162 | ||
d7978c0f | 1163 | for (dane_list head = (dane_list) list; head; head = next) |
880a1e77 JH |
1164 | { |
1165 | next = head->next; | |
1166 | if (f && head->value) | |
1167 | f(head->value); | |
1168 | OPENSSL_free(head); | |
1169 | } | |
e682570f TL |
1170 | } |
1171 | ||
3376de6c JH |
1172 | static void |
1173 | ossl_free(void * p) | |
1174 | { | |
1175 | OPENSSL_free(p); | |
1176 | } | |
1177 | ||
880a1e77 JH |
1178 | static void |
1179 | dane_mtype_free(void *p) | |
e682570f | 1180 | { |
3376de6c | 1181 | list_free(((dane_mtype) p)->data, ossl_free); |
880a1e77 | 1182 | OPENSSL_free(p); |
e682570f TL |
1183 | } |
1184 | ||
880a1e77 JH |
1185 | static void |
1186 | dane_selector_free(void *p) | |
e682570f | 1187 | { |
880a1e77 JH |
1188 | list_free(((dane_selector) p)->mtype, dane_mtype_free); |
1189 | OPENSSL_free(p); | |
e682570f TL |
1190 | } |
1191 | ||
946ecbe0 JH |
1192 | |
1193 | ||
1194 | /* | |
1195 | ||
1196 | Tidy up once the connection is finished with. | |
1197 | ||
1198 | Arguments | |
1199 | ssl The ssl connection handle | |
1200 | ||
1201 | => Before calling SSL_free() | |
1202 | tls_close() and tls_getc() [the error path] are the obvious places. | |
1203 | Could we do it earlier - right after verification? In tls_client_start() | |
1204 | right after SSL_connect() returns, in that case. | |
1205 | ||
1206 | */ | |
1207 | ||
880a1e77 JH |
1208 | void |
1209 | DANESSL_cleanup(SSL *ssl) | |
e682570f | 1210 | { |
880a1e77 | 1211 | ssl_dane *dane; |
880a1e77 | 1212 | |
e5cccda9 | 1213 | DEBUG(D_tls) debug_printf("Dane lib-cleanup\n"); |
6634ac8d | 1214 | |
aaba7d03 | 1215 | if (dane_idx < 0 || !(dane = SSL_get_ex_data(ssl, dane_idx))) |
880a1e77 JH |
1216 | return; |
1217 | (void) SSL_set_ex_data(ssl, dane_idx, 0); | |
1218 | ||
aaba7d03 VD |
1219 | dane_reset(dane); |
1220 | if (dane->hosts) | |
3376de6c | 1221 | list_free(dane->hosts, ossl_free); |
d7978c0f | 1222 | for (int u = 0; u <= DANESSL_USAGE_LAST; ++u) |
aaba7d03 | 1223 | if (dane->selectors[u]) |
880a1e77 | 1224 | list_free(dane->selectors[u], dane_selector_free); |
aaba7d03 | 1225 | if (dane->pkeys) |
880a1e77 | 1226 | list_free(dane->pkeys, pkey_free); |
aaba7d03 | 1227 | if (dane->certs) |
880a1e77 | 1228 | list_free(dane->certs, cert_free); |
880a1e77 | 1229 | OPENSSL_free(dane); |
e682570f TL |
1230 | } |
1231 | ||
880a1e77 JH |
1232 | static dane_host_list |
1233 | host_list_init(const char **src) | |
e682570f | 1234 | { |
880a1e77 JH |
1235 | dane_host_list head = NULL; |
1236 | ||
aaba7d03 | 1237 | while (*src) |
880a1e77 JH |
1238 | { |
1239 | dane_host_list elem = (dane_host_list) OPENSSL_malloc(sizeof(*elem)); | |
aaba7d03 | 1240 | if (elem == 0) |
880a1e77 | 1241 | { |
3376de6c | 1242 | list_free(head, ossl_free); |
880a1e77 | 1243 | return 0; |
e682570f | 1244 | } |
880a1e77 JH |
1245 | elem->value = OPENSSL_strdup(*src++); |
1246 | LINSERT(head, elem); | |
1247 | } | |
1248 | return head; | |
e682570f TL |
1249 | } |
1250 | ||
946ecbe0 | 1251 | |
aaba7d03 VD |
1252 | int |
1253 | DANESSL_get_match_cert(SSL *ssl, X509 **match, const char **mhost, int *depth) | |
1254 | { | |
1255 | ssl_dane *dane; | |
1256 | ||
1257 | if (dane_idx < 0 || (dane = SSL_get_ex_data(ssl, dane_idx)) == 0) | |
1258 | { | |
1259 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_INIT); | |
1260 | return -1; | |
1261 | } | |
1262 | ||
1263 | if (dane->match) | |
1264 | { | |
1265 | if (match) | |
1266 | *match = dane->match; | |
1267 | if (mhost) | |
1268 | *mhost = dane->mhost; | |
1269 | if (depth) | |
1270 | *depth = dane->mdpth; | |
1271 | } | |
1272 | ||
1273 | return (dane->match != 0); | |
1274 | } | |
1275 | ||
1276 | ||
1277 | #ifdef never_called | |
1278 | int | |
1279 | DANESSL_verify_chain(SSL *ssl, STACK_OF(X509) *chain) | |
1280 | { | |
1281 | int ret; | |
1282 | X509 *cert; | |
3376de6c | 1283 | X509_STORE_CTX * store_ctx; |
aaba7d03 VD |
1284 | SSL_CTX *ssl_ctx = SSL_get_SSL_CTX(ssl); |
1285 | X509_STORE *store = SSL_CTX_get_cert_store(ssl_ctx); | |
1286 | int store_ctx_idx = SSL_get_ex_data_X509_STORE_CTX_idx(); | |
1287 | ||
1288 | cert = sk_X509_value(chain, 0); | |
3376de6c JH |
1289 | if (!(store_ctx = X509_STORE_CTX_new())) |
1290 | { | |
1291 | DANEerr(DANESSL_F_DANESSL_VERIFY_CHAIN, ERR_R_MALLOC_FAILURE); | |
1292 | return 0; | |
1293 | } | |
1294 | if (!X509_STORE_CTX_init(store_ctx, store, cert, chain)) | |
1295 | { | |
1296 | X509_STORE_CTX_free(store_ctx); | |
aaba7d03 | 1297 | return 0; |
3376de6c JH |
1298 | } |
1299 | X509_STORE_CTX_set_ex_data(store_ctx, store_ctx_idx, ssl); | |
aaba7d03 | 1300 | |
3376de6c | 1301 | X509_STORE_CTX_set_default(store_ctx, |
aaba7d03 | 1302 | SSL_is_server(ssl) ? "ssl_client" : "ssl_server"); |
3376de6c | 1303 | X509_VERIFY_PARAM_set1(X509_STORE_CTX_get0_param(store_ctx), |
aaba7d03 VD |
1304 | SSL_get0_param(ssl)); |
1305 | ||
1306 | if (SSL_get_verify_callback(ssl)) | |
3376de6c | 1307 | X509_STORE_CTX_set_verify_cb(store_ctx, SSL_get_verify_callback(ssl)); |
aaba7d03 | 1308 | |
3376de6c | 1309 | ret = verify_cert(store_ctx, NULL); |
aaba7d03 | 1310 | |
3376de6c JH |
1311 | SSL_set_verify_result(ssl, X509_STORE_CTX_get_error(store_ctx)); |
1312 | X509_STORE_CTX_cleanup(store_ctx); | |
aaba7d03 VD |
1313 | |
1314 | return (ret); | |
1315 | } | |
1316 | #endif | |
1317 | ||
1318 | ||
946ecbe0 JH |
1319 | |
1320 | ||
1321 | /* | |
1322 | ||
1323 | Call this for each TLSA record found for the target, after the | |
1324 | DANE setup has been done on the ssl connection handle. | |
1325 | ||
1326 | Arguments: | |
1327 | ssl Connection handle | |
1328 | usage TLSA record field | |
1329 | selector TLSA record field | |
1330 | mdname ??? message digest name? | |
1331 | data ??? TLSA record megalump? | |
1332 | dlen length of data | |
1333 | ||
1334 | Return | |
1335 | -1 on error | |
1336 | 0 action not taken | |
1337 | 1 record accepted | |
1338 | */ | |
1339 | ||
880a1e77 JH |
1340 | int |
1341 | DANESSL_add_tlsa(SSL *ssl, uint8_t usage, uint8_t selector, const char *mdname, | |
1342 | unsigned const char *data, size_t dlen) | |
e682570f | 1343 | { |
880a1e77 JH |
1344 | ssl_dane *dane; |
1345 | dane_selector_list s = 0; | |
1346 | dane_mtype_list m = 0; | |
1347 | dane_data_list d = 0; | |
1348 | dane_cert_list xlist = 0; | |
1349 | dane_pkey_list klist = 0; | |
1350 | const EVP_MD *md = 0; | |
1351 | ||
b4161d10 JH |
1352 | DEBUG(D_tls) debug_printf("Dane add-tlsa: usage %u sel %u mdname \"%s\"\n", |
1353 | usage, selector, mdname); | |
6634ac8d | 1354 | |
880a1e77 JH |
1355 | if(dane_idx < 0 || !(dane = SSL_get_ex_data(ssl, dane_idx))) |
1356 | { | |
aaba7d03 | 1357 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_INIT); |
880a1e77 JH |
1358 | return -1; |
1359 | } | |
1360 | ||
aaba7d03 | 1361 | if (usage > DANESSL_USAGE_LAST) |
880a1e77 | 1362 | { |
aaba7d03 | 1363 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_USAGE); |
880a1e77 JH |
1364 | return 0; |
1365 | } | |
aaba7d03 | 1366 | if (selector > DANESSL_SELECTOR_LAST) |
880a1e77 | 1367 | { |
aaba7d03 | 1368 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_SELECTOR); |
880a1e77 JH |
1369 | return 0; |
1370 | } | |
1371 | ||
854586e1 JH |
1372 | /* Support built-in standard one-digit mtypes */ |
1373 | if (mdname && *mdname && mdname[1] == '\0') | |
1374 | switch (*mdname - '0') | |
1375 | { | |
1376 | case DANESSL_MATCHING_FULL: mdname = 0; break; | |
1377 | case DANESSL_MATCHING_2256: mdname = "sha256"; break; | |
1378 | case DANESSL_MATCHING_2512: mdname = "sha512"; break; | |
1379 | } | |
1380 | if (mdname && *mdname && !(md = EVP_get_digestbyname(mdname))) | |
1381 | { | |
1382 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_DIGEST); | |
1383 | return 0; | |
1384 | } | |
1385 | if (mdname && *mdname && dlen != EVP_MD_size(md)) | |
1386 | { | |
1387 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_DATA_LENGTH); | |
1388 | return 0; | |
1389 | } | |
1390 | if (!data) | |
1391 | { | |
1392 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_NULL_DATA); | |
1393 | return 0; | |
1394 | } | |
aaba7d03 | 1395 | |
854586e1 JH |
1396 | /* |
1397 | * Full Certificate or Public Key when NULL or empty digest name | |
1398 | */ | |
1399 | if (!mdname || !*mdname) | |
1400 | { | |
1401 | X509 *x = 0; | |
1402 | EVP_PKEY *k = 0; | |
1403 | const unsigned char *p = data; | |
e682570f TL |
1404 | |
1405 | #define xklistinit(lvar, ltype, var, freeFunc) do { \ | |
aaba7d03 VD |
1406 | (lvar) = (ltype) OPENSSL_malloc(sizeof(*(lvar))); \ |
1407 | if ((lvar) == 0) { \ | |
1408 | DANEerr(DANESSL_F_ADD_TLSA, ERR_R_MALLOC_FAILURE); \ | |
1409 | freeFunc((var)); \ | |
1410 | return 0; \ | |
1411 | } \ | |
1412 | (lvar)->next = 0; \ | |
1413 | lvar->value = var; \ | |
1414 | } while (0) | |
e682570f | 1415 | #define xkfreeret(ret) do { \ |
aaba7d03 VD |
1416 | if (xlist) list_free(xlist, cert_free); \ |
1417 | if (klist) list_free(klist, pkey_free); \ | |
1418 | return (ret); \ | |
1419 | } while (0) | |
880a1e77 | 1420 | |
aaba7d03 | 1421 | switch (selector) |
880a1e77 | 1422 | { |
aaba7d03 VD |
1423 | case DANESSL_SELECTOR_CERT: |
1424 | if (!d2i_X509(&x, &p, dlen) || dlen != p - data) | |
880a1e77 JH |
1425 | { |
1426 | if (x) | |
aaba7d03 VD |
1427 | X509_free(x); |
1428 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_CERT); | |
880a1e77 JH |
1429 | return 0; |
1430 | } | |
1431 | k = X509_get_pubkey(x); | |
1432 | EVP_PKEY_free(k); | |
aaba7d03 | 1433 | if (k == 0) |
880a1e77 JH |
1434 | { |
1435 | X509_free(x); | |
aaba7d03 | 1436 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_CERT_PKEY); |
880a1e77 JH |
1437 | return 0; |
1438 | } | |
aaba7d03 | 1439 | if (usage == DANESSL_USAGE_DANE_TA) |
880a1e77 JH |
1440 | xklistinit(xlist, dane_cert_list, x, X509_free); |
1441 | break; | |
1442 | ||
aaba7d03 VD |
1443 | case DANESSL_SELECTOR_SPKI: |
1444 | if (!d2i_PUBKEY(&k, &p, dlen) || dlen != p - data) | |
880a1e77 | 1445 | { |
aaba7d03 | 1446 | if (k) |
880a1e77 | 1447 | EVP_PKEY_free(k); |
aaba7d03 VD |
1448 | DANEerr(DANESSL_F_ADD_TLSA, DANESSL_R_BAD_PKEY); |
1449 | return 0; | |
880a1e77 | 1450 | } |
aaba7d03 | 1451 | if (usage == DANESSL_USAGE_DANE_TA) |
880a1e77 JH |
1452 | xklistinit(klist, dane_pkey_list, k, EVP_PKEY_free); |
1453 | break; | |
e682570f | 1454 | } |
880a1e77 JH |
1455 | } |
1456 | ||
1457 | /* Find insertion point and don't add duplicate elements. */ | |
aaba7d03 VD |
1458 | for (s = dane->selectors[usage]; s; s = s->next) |
1459 | if (s->value->selector == selector) | |
1460 | { | |
1461 | for (m = s->value->mtype; m; m = m->next) | |
1462 | if (m->value->md == md) | |
1463 | { | |
1464 | for (d = m->value->data; d; d = d->next) | |
1465 | if ( d->value->datalen == dlen | |
1466 | && memcmp(d->value->data, data, dlen) == 0) | |
880a1e77 | 1467 | xkfreeret(1); |
aaba7d03 VD |
1468 | break; |
1469 | } | |
1470 | break; | |
1471 | } | |
880a1e77 | 1472 | |
aaba7d03 | 1473 | if ((d = (dane_data_list) list_alloc(sizeof(*d->value) + dlen)) == 0) |
880a1e77 JH |
1474 | xkfreeret(0); |
1475 | d->value->datalen = dlen; | |
1476 | memcpy(d->value->data, data, dlen); | |
aaba7d03 | 1477 | if (!m) |
880a1e77 | 1478 | { |
aaba7d03 | 1479 | if ((m = (dane_mtype_list) list_alloc(sizeof(*m->value))) == 0) |
880a1e77 | 1480 | { |
3376de6c | 1481 | list_free(d, ossl_free); |
880a1e77 | 1482 | xkfreeret(0); |
e682570f | 1483 | } |
880a1e77 | 1484 | m->value->data = 0; |
aaba7d03 | 1485 | if ((m->value->md = md) != 0) |
880a1e77 | 1486 | m->value->mdlen = dlen; |
aaba7d03 | 1487 | if (!s) |
880a1e77 | 1488 | { |
aaba7d03 | 1489 | if ((s = (dane_selector_list) list_alloc(sizeof(*s->value))) == 0) |
880a1e77 JH |
1490 | { |
1491 | list_free(m, dane_mtype_free); | |
1492 | xkfreeret(0); | |
1493 | } | |
1494 | s->value->mtype = 0; | |
1495 | s->value->selector = selector; | |
1496 | LINSERT(dane->selectors[usage], s); | |
1497 | } | |
1498 | LINSERT(s->value->mtype, m); | |
1499 | } | |
1500 | LINSERT(m->value->data, d); | |
1501 | ||
aaba7d03 | 1502 | if (xlist) |
880a1e77 | 1503 | LINSERT(dane->certs, xlist); |
aaba7d03 | 1504 | else if (klist) |
880a1e77 JH |
1505 | LINSERT(dane->pkeys, klist); |
1506 | ++dane->count; | |
1507 | return 1; | |
e682570f TL |
1508 | } |
1509 | ||
946ecbe0 JH |
1510 | |
1511 | ||
1512 | ||
1513 | /* | |
1514 | Call this once we have an ssl connection handle but before | |
1515 | making the TLS connection. | |
1516 | ||
1517 | => In tls_client_start() after the call to SSL_new() | |
1518 | and before the call to SSL_connect(). Exactly where | |
1519 | probably does not matter. | |
1520 | We probably want to keep our existing SNI handling; | |
1521 | call this with NULL. | |
1522 | ||
1523 | Arguments: | |
1524 | ssl Connection handle | |
1525 | sni_domain Optional peer server name | |
868f5672 | 1526 | hostnames list of names to chack against peer cert |
946ecbe0 JH |
1527 | |
1528 | Return | |
1529 | -1 on fatal error | |
1530 | 0 nonfatal error | |
1531 | 1 success | |
1532 | */ | |
1533 | ||
880a1e77 JH |
1534 | int |
1535 | DANESSL_init(SSL *ssl, const char *sni_domain, const char **hostnames) | |
e682570f | 1536 | { |
880a1e77 | 1537 | ssl_dane *dane; |
e682570f | 1538 | |
aaba7d03 VD |
1539 | DEBUG(D_tls) debug_printf("Dane ssl_init\n"); |
1540 | if (dane_idx < 0) | |
880a1e77 | 1541 | { |
aaba7d03 | 1542 | DANEerr(DANESSL_F_INIT, DANESSL_R_LIBRARY_INIT); |
880a1e77 JH |
1543 | return -1; |
1544 | } | |
e682570f | 1545 | |
aaba7d03 VD |
1546 | if (sni_domain && !SSL_set_tlsext_host_name(ssl, sni_domain)) |
1547 | return 0; | |
e682570f | 1548 | |
aaba7d03 | 1549 | if ((dane = (ssl_dane *) OPENSSL_malloc(sizeof(ssl_dane))) == 0) |
880a1e77 | 1550 | { |
aaba7d03 | 1551 | DANEerr(DANESSL_F_INIT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1552 | return 0; |
1553 | } | |
aaba7d03 | 1554 | if (!SSL_set_ex_data(ssl, dane_idx, dane)) |
880a1e77 | 1555 | { |
aaba7d03 | 1556 | DANEerr(DANESSL_F_INIT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1557 | OPENSSL_free(dane); |
1558 | return 0; | |
1559 | } | |
1560 | ||
6634ac8d JH |
1561 | dane->verify = 0; |
1562 | dane->hosts = 0; | |
1563 | dane->thost = 0; | |
880a1e77 JH |
1564 | dane->pkeys = 0; |
1565 | dane->certs = 0; | |
1566 | dane->chain = 0; | |
aaba7d03 | 1567 | dane->match = 0; |
880a1e77 JH |
1568 | dane->roots = 0; |
1569 | dane->depth = -1; | |
aaba7d03 VD |
1570 | dane->mhost = 0; /* Future SSL control interface */ |
1571 | dane->mdpth = 0; /* Future SSL control interface */ | |
1572 | dane->multi = 0; /* Future SSL control interface */ | |
880a1e77 | 1573 | dane->count = 0; |
aaba7d03 | 1574 | dane->hosts = 0; |
880a1e77 | 1575 | |
d7978c0f | 1576 | for (int i = 0; i <= DANESSL_USAGE_LAST; ++i) |
aaba7d03 | 1577 | dane->selectors[i] = 0; |
880a1e77 | 1578 | |
aaba7d03 | 1579 | if (hostnames && (dane->hosts = host_list_init(hostnames)) == 0) |
880a1e77 | 1580 | { |
aaba7d03 | 1581 | DANEerr(DANESSL_F_INIT, ERR_R_MALLOC_FAILURE); |
880a1e77 JH |
1582 | DANESSL_cleanup(ssl); |
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | return 1; | |
e682570f TL |
1587 | } |
1588 | ||
946ecbe0 JH |
1589 | |
1590 | /* | |
1591 | ||
1592 | Call this once we have a context to work with, but | |
1593 | before DANESSL_init() | |
1594 | ||
1595 | => in tls_client_start(), after tls_init() call gives us the ctx, | |
1596 | if we decide we want to (policy) and can (TLSA records available) | |
1597 | replacing (? what about fallback) everything from testing tls_verify_hosts | |
1598 | down to just before calling SSL_new() for the conn handle. | |
1599 | ||
1600 | Arguments | |
1601 | ctx SSL context | |
1602 | ||
1603 | Return | |
1604 | -1 Error | |
1605 | 1 Success | |
1606 | */ | |
1607 | ||
880a1e77 JH |
1608 | int |
1609 | DANESSL_CTX_init(SSL_CTX *ctx) | |
e682570f | 1610 | { |
6634ac8d | 1611 | DEBUG(D_tls) debug_printf("Dane ctx-init\n"); |
aaba7d03 | 1612 | if (dane_idx >= 0) |
880a1e77 JH |
1613 | { |
1614 | SSL_CTX_set_cert_verify_callback(ctx, verify_cert, 0); | |
1615 | return 1; | |
1616 | } | |
aaba7d03 | 1617 | DANEerr(DANESSL_F_CTX_INIT, DANESSL_R_LIBRARY_INIT); |
880a1e77 | 1618 | return -1; |
e682570f TL |
1619 | } |
1620 | ||
880a1e77 JH |
1621 | static void |
1622 | dane_init(void) | |
e682570f | 1623 | { |
880a1e77 JH |
1624 | /* |
1625 | * Store library id in zeroth function slot, used to locate the library | |
1626 | * name. This must be done before we load the error strings. | |
1627 | */ | |
3376de6c JH |
1628 | err_lib_dane = ERR_get_next_error_library(); |
1629 | ||
e682570f | 1630 | #ifndef OPENSSL_NO_ERR |
3376de6c JH |
1631 | if (err_lib_dane > 0) |
1632 | { | |
1633 | dane_str_functs[0].error |= ERR_PACK(err_lib_dane, 0, 0); | |
1634 | ERR_load_strings(err_lib_dane, dane_str_functs); | |
1635 | ERR_load_strings(err_lib_dane, dane_str_reasons); | |
1636 | } | |
e682570f TL |
1637 | #endif |
1638 | ||
880a1e77 JH |
1639 | /* |
1640 | * Register SHA-2 digests, if implemented and not already registered. | |
1641 | */ | |
e682570f | 1642 | #if defined(LN_sha256) && defined(NID_sha256) && !defined(OPENSSL_NO_SHA256) |
aaba7d03 VD |
1643 | if (!EVP_get_digestbyname(LN_sha224)) EVP_add_digest(EVP_sha224()); |
1644 | if (!EVP_get_digestbyname(LN_sha256)) EVP_add_digest(EVP_sha256()); | |
e682570f TL |
1645 | #endif |
1646 | #if defined(LN_sha512) && defined(NID_sha512) && !defined(OPENSSL_NO_SHA512) | |
aaba7d03 VD |
1647 | if (!EVP_get_digestbyname(LN_sha384)) EVP_add_digest(EVP_sha384()); |
1648 | if (!EVP_get_digestbyname(LN_sha512)) EVP_add_digest(EVP_sha512()); | |
e682570f TL |
1649 | #endif |
1650 | ||
880a1e77 JH |
1651 | /* |
1652 | * Register an SSL index for the connection-specific ssl_dane structure. | |
1653 | * Using a separate index makes it possible to add DANE support to | |
1654 | * existing OpenSSL releases that don't have a suitable pointer in the | |
1655 | * SSL structure. | |
1656 | */ | |
1657 | dane_idx = SSL_get_ex_new_index(0, 0, 0, 0, 0); | |
e682570f TL |
1658 | } |
1659 | ||
946ecbe0 | 1660 | |
278293d3 | 1661 | #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER) |
3376de6c JH |
1662 | static void |
1663 | run_once(volatile int * once, void (*init)(void)) | |
1664 | { | |
1665 | int wlock = 0; | |
1666 | ||
1667 | CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); | |
1668 | if (!*once) | |
1669 | { | |
1670 | CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); | |
1671 | CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); | |
1672 | wlock = 1; | |
1673 | if (!*once) | |
1674 | { | |
1675 | *once = 1; | |
1676 | init(); | |
1677 | } | |
1678 | } | |
1679 | if (wlock) | |
1680 | CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); | |
1681 | else | |
1682 | CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); | |
1683 | } | |
1684 | #endif | |
1685 | ||
1686 | ||
946ecbe0 JH |
1687 | |
1688 | /* | |
1689 | ||
1690 | Call this once. Probably early in startup will do; may need | |
1691 | to be after SSL library init. | |
1692 | ||
043b1248 JH |
1693 | => put after call to tls_init() for now |
1694 | ||
1695 | Return | |
1696 | 1 Success | |
1697 | 0 Fail | |
946ecbe0 JH |
1698 | */ |
1699 | ||
880a1e77 JH |
1700 | int |
1701 | DANESSL_library_init(void) | |
e682570f | 1702 | { |
3376de6c JH |
1703 | static CRYPTO_ONCE once = CRYPTO_ONCE_STATIC_INIT; |
1704 | ||
6634ac8d | 1705 | DEBUG(D_tls) debug_printf("Dane lib-init\n"); |
3376de6c | 1706 | (void) CRYPTO_THREAD_run_once(&once, dane_init); |
e682570f TL |
1707 | |
1708 | #if defined(LN_sha256) | |
880a1e77 | 1709 | /* No DANE without SHA256 support */ |
aaba7d03 | 1710 | if (dane_idx >= 0 && EVP_get_digestbyname(LN_sha256) != 0) |
880a1e77 | 1711 | return 1; |
e682570f | 1712 | #endif |
aaba7d03 | 1713 | DANEerr(DANESSL_F_LIBRARY_INIT, DANESSL_R_SUPPORT); |
880a1e77 | 1714 | return 0; |
e682570f TL |
1715 | } |
1716 | ||
946ecbe0 | 1717 | |
880a1e77 JH |
1718 | /* vi: aw ai sw=2 |
1719 | */ |