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