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Commit | Line | Data |
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0f113f3e | 1 | /* |
4333b89f | 2 | * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved. |
5c4436c9 | 3 | * |
08ddd302 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
b1322259 RS |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
5c4436c9 DSH |
8 | */ |
9 | ||
b39fc560 | 10 | #include "internal/cryptlib.h" |
5c4436c9 DSH |
11 | #include <openssl/asn1t.h> |
12 | #include <openssl/pem.h> | |
13 | #include <openssl/x509v3.h> | |
14 | #include <openssl/err.h> | |
15 | #include <openssl/cms.h> | |
16 | #include <openssl/rand.h> | |
924663c3 | 17 | #include "crypto/evp.h" |
706457b7 | 18 | #include "cms_local.h" |
5c4436c9 DSH |
19 | |
20 | /* CMS EncryptedData Utilities */ | |
21 | ||
320bfc1b DSH |
22 | /* Return BIO based on EncryptedContentInfo and key */ |
23 | ||
53155f1c SL |
24 | BIO *ossl_cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec, |
25 | const CMS_CTX *cms_ctx) | |
0f113f3e MC |
26 | { |
27 | BIO *b; | |
28 | EVP_CIPHER_CTX *ctx; | |
c1669f41 SL |
29 | EVP_CIPHER *fetched_ciph = NULL; |
30 | const EVP_CIPHER *cipher = NULL; | |
0f113f3e | 31 | X509_ALGOR *calg = ec->contentEncryptionAlgorithm; |
924663c3 | 32 | evp_cipher_aead_asn1_params aparams; |
0f113f3e MC |
33 | unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL; |
34 | unsigned char *tkey = NULL; | |
c8ea9bc6 | 35 | int len; |
924663c3 | 36 | int ivlen = 0; |
0f113f3e | 37 | size_t tkeylen = 0; |
0f113f3e | 38 | int ok = 0; |
0f113f3e | 39 | int enc, keep_key = 0; |
53155f1c SL |
40 | OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(cms_ctx); |
41 | const char *propq = ossl_cms_ctx_get0_propq(cms_ctx); | |
5c4436c9 | 42 | |
0f113f3e | 43 | enc = ec->cipher ? 1 : 0; |
5c4436c9 | 44 | |
0f113f3e | 45 | b = BIO_new(BIO_f_cipher()); |
90945fa3 | 46 | if (b == NULL) { |
e077455e | 47 | ERR_raise(ERR_LIB_CMS, ERR_R_BIO_LIB); |
0f113f3e MC |
48 | return NULL; |
49 | } | |
5c4436c9 | 50 | |
0f113f3e | 51 | BIO_get_cipher_ctx(b, &ctx); |
5c4436c9 | 52 | |
1acb2e6f | 53 | (void)ERR_set_mark(); |
0f113f3e | 54 | if (enc) { |
c1669f41 | 55 | cipher = ec->cipher; |
0f113f3e MC |
56 | /* |
57 | * If not keeping key set cipher to NULL so subsequent calls decrypt. | |
58 | */ | |
c1669f41 | 59 | if (ec->key != NULL) |
0f113f3e MC |
60 | ec->cipher = NULL; |
61 | } else { | |
c1669f41 SL |
62 | cipher = EVP_get_cipherbyobj(calg->algorithm); |
63 | } | |
64 | if (cipher != NULL) { | |
ed576acd TM |
65 | fetched_ciph = EVP_CIPHER_fetch(libctx, EVP_CIPHER_get0_name(cipher), |
66 | propq); | |
1acb2e6f SL |
67 | if (fetched_ciph != NULL) |
68 | cipher = fetched_ciph; | |
69 | } | |
70 | if (cipher == NULL) { | |
71 | (void)ERR_clear_last_mark(); | |
9311d0c4 | 72 | ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_CIPHER); |
1acb2e6f | 73 | goto err; |
0f113f3e | 74 | } |
1acb2e6f SL |
75 | (void)ERR_pop_to_mark(); |
76 | ||
77 | if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc) <= 0) { | |
9311d0c4 | 78 | ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR); |
0f113f3e MC |
79 | goto err; |
80 | } | |
5c4436c9 | 81 | |
0f113f3e | 82 | if (enc) { |
ed576acd | 83 | calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_get_type(ctx)); |
0f113f3e | 84 | /* Generate a random IV if we need one */ |
ed576acd | 85 | ivlen = EVP_CIPHER_CTX_get_iv_length(ctx); |
83ab43da DB |
86 | if (ivlen < 0) { |
87 | ERR_raise(ERR_LIB_CMS, ERR_R_EVP_LIB); | |
88 | goto err; | |
89 | } | |
90 | ||
0f113f3e | 91 | if (ivlen > 0) { |
5cbd2ea3 | 92 | if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0) |
0f113f3e MC |
93 | goto err; |
94 | piv = iv; | |
95 | } | |
924663c3 JZ |
96 | } else { |
97 | if (evp_cipher_asn1_to_param_ex(ctx, calg->parameter, &aparams) <= 0) { | |
9311d0c4 | 98 | ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); |
924663c3 JZ |
99 | goto err; |
100 | } | |
ed576acd | 101 | if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) { |
924663c3 JZ |
102 | piv = aparams.iv; |
103 | if (ec->taglen > 0 | |
104 | && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, | |
105 | ec->taglen, ec->tag) <= 0) { | |
9311d0c4 | 106 | ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_AEAD_SET_TAG_ERROR); |
924663c3 JZ |
107 | goto err; |
108 | } | |
109 | } | |
0f113f3e | 110 | } |
ed576acd | 111 | len = EVP_CIPHER_CTX_get_key_length(ctx); |
c8ea9bc6 SL |
112 | if (len <= 0) |
113 | goto err; | |
114 | tkeylen = (size_t)len; | |
115 | ||
0f113f3e MC |
116 | /* Generate random session key */ |
117 | if (!enc || !ec->key) { | |
118 | tkey = OPENSSL_malloc(tkeylen); | |
e077455e | 119 | if (tkey == NULL) |
0f113f3e | 120 | goto err; |
0f113f3e MC |
121 | if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0) |
122 | goto err; | |
123 | } | |
146b52ed | 124 | |
0f113f3e MC |
125 | if (!ec->key) { |
126 | ec->key = tkey; | |
127 | ec->keylen = tkeylen; | |
128 | tkey = NULL; | |
129 | if (enc) | |
130 | keep_key = 1; | |
131 | else | |
132 | ERR_clear_error(); | |
146b52ed | 133 | |
0f113f3e | 134 | } |
e540d1cd | 135 | |
0f113f3e MC |
136 | if (ec->keylen != tkeylen) { |
137 | /* If necessary set key length */ | |
138 | if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) { | |
139 | /* | |
140 | * Only reveal failure if debugging so we don't leak information | |
141 | * which may be useful in MMA. | |
142 | */ | |
143 | if (enc || ec->debug) { | |
9311d0c4 | 144 | ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH); |
0f113f3e MC |
145 | goto err; |
146 | } else { | |
147 | /* Use random key */ | |
4b45c6e5 | 148 | OPENSSL_clear_free(ec->key, ec->keylen); |
0f113f3e MC |
149 | ec->key = tkey; |
150 | ec->keylen = tkeylen; | |
151 | tkey = NULL; | |
152 | ERR_clear_error(); | |
153 | } | |
154 | } | |
155 | } | |
5c4436c9 | 156 | |
0f113f3e | 157 | if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) { |
9311d0c4 | 158 | ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR); |
0f113f3e MC |
159 | goto err; |
160 | } | |
708cf5de DSH |
161 | if (enc) { |
162 | calg->parameter = ASN1_TYPE_new(); | |
163 | if (calg->parameter == NULL) { | |
e077455e | 164 | ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB); |
708cf5de DSH |
165 | goto err; |
166 | } | |
ed576acd | 167 | if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) { |
924663c3 JZ |
168 | memcpy(aparams.iv, piv, ivlen); |
169 | aparams.iv_len = ivlen; | |
ed576acd | 170 | aparams.tag_len = EVP_CIPHER_CTX_get_tag_length(ctx); |
924663c3 JZ |
171 | if (aparams.tag_len <= 0) |
172 | goto err; | |
173 | } | |
174 | ||
175 | if (evp_cipher_param_to_asn1_ex(ctx, calg->parameter, &aparams) <= 0) { | |
9311d0c4 | 176 | ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); |
708cf5de DSH |
177 | goto err; |
178 | } | |
179 | /* If parameter type not set omit parameter */ | |
180 | if (calg->parameter->type == V_ASN1_UNDEF) { | |
181 | ASN1_TYPE_free(calg->parameter); | |
182 | calg->parameter = NULL; | |
183 | } | |
0f113f3e MC |
184 | } |
185 | ok = 1; | |
5c4436c9 | 186 | |
0f113f3e | 187 | err: |
1acb2e6f | 188 | EVP_CIPHER_free(fetched_ciph); |
891eac46 | 189 | if (!keep_key || !ok) { |
4b45c6e5 | 190 | OPENSSL_clear_free(ec->key, ec->keylen); |
0f113f3e MC |
191 | ec->key = NULL; |
192 | } | |
4b45c6e5 | 193 | OPENSSL_clear_free(tkey, tkeylen); |
0f113f3e MC |
194 | if (ok) |
195 | return b; | |
196 | BIO_free(b); | |
197 | return NULL; | |
198 | } | |
199 | ||
53155f1c SL |
200 | int ossl_cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec, |
201 | const EVP_CIPHER *cipher, | |
202 | const unsigned char *key, size_t keylen, | |
203 | const CMS_CTX *cms_ctx) | |
0f113f3e MC |
204 | { |
205 | ec->cipher = cipher; | |
206 | if (key) { | |
e077455e | 207 | if ((ec->key = OPENSSL_malloc(keylen)) == NULL) |
0f113f3e MC |
208 | return 0; |
209 | memcpy(ec->key, key, keylen); | |
210 | } | |
211 | ec->keylen = keylen; | |
c1669f41 | 212 | if (cipher != NULL) |
0f113f3e MC |
213 | ec->contentType = OBJ_nid2obj(NID_pkcs7_data); |
214 | return 1; | |
215 | } | |
320bfc1b DSH |
216 | |
217 | int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph, | |
0f113f3e MC |
218 | const unsigned char *key, size_t keylen) |
219 | { | |
220 | CMS_EncryptedContentInfo *ec; | |
c1669f41 | 221 | |
0f113f3e | 222 | if (!key || !keylen) { |
9311d0c4 | 223 | ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY); |
0f113f3e MC |
224 | return 0; |
225 | } | |
226 | if (ciph) { | |
227 | cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData); | |
228 | if (!cms->d.encryptedData) { | |
e077455e | 229 | ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB); |
0f113f3e MC |
230 | return 0; |
231 | } | |
232 | cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted); | |
233 | cms->d.encryptedData->version = 0; | |
234 | } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) { | |
9311d0c4 | 235 | ERR_raise(ERR_LIB_CMS, CMS_R_NOT_ENCRYPTED_DATA); |
0f113f3e MC |
236 | return 0; |
237 | } | |
238 | ec = cms->d.encryptedData->encryptedContentInfo; | |
53155f1c SL |
239 | return ossl_cms_EncryptedContent_init(ec, ciph, key, keylen, |
240 | ossl_cms_get0_cmsctx(cms)); | |
0f113f3e | 241 | } |
320bfc1b | 242 | |
53155f1c | 243 | BIO *ossl_cms_EncryptedData_init_bio(const CMS_ContentInfo *cms) |
0f113f3e MC |
244 | { |
245 | CMS_EncryptedData *enc = cms->d.encryptedData; | |
246 | if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs) | |
247 | enc->version = 2; | |
53155f1c SL |
248 | return ossl_cms_EncryptedContent_init_bio(enc->encryptedContentInfo, |
249 | ossl_cms_get0_cmsctx(cms)); | |
0f113f3e | 250 | } |