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0f113f3e | 1 | /* |
e39e295e | 2 | * Copyright 2008-2020 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 | ||
c1669f41 SL |
24 | BIO *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; |
84af8027 SL |
40 | OSSL_LIB_CTX *libctx = cms_ctx_get0_libctx(cms_ctx); |
41 | const char *propq = 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) { |
9311d0c4 | 47 | ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE); |
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) { | |
84af8027 | 65 | fetched_ciph = EVP_CIPHER_fetch(libctx, EVP_CIPHER_name(cipher), propq); |
1acb2e6f SL |
66 | if (fetched_ciph != NULL) |
67 | cipher = fetched_ciph; | |
68 | } | |
69 | if (cipher == NULL) { | |
70 | (void)ERR_clear_last_mark(); | |
9311d0c4 | 71 | ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_CIPHER); |
1acb2e6f | 72 | goto err; |
0f113f3e | 73 | } |
1acb2e6f SL |
74 | (void)ERR_pop_to_mark(); |
75 | ||
76 | if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc) <= 0) { | |
9311d0c4 | 77 | ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR); |
0f113f3e MC |
78 | goto err; |
79 | } | |
5c4436c9 | 80 | |
0f113f3e | 81 | if (enc) { |
0f113f3e MC |
82 | calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx)); |
83 | /* Generate a random IV if we need one */ | |
84 | ivlen = EVP_CIPHER_CTX_iv_length(ctx); | |
85 | if (ivlen > 0) { | |
84af8027 | 86 | if (RAND_bytes_ex(libctx, iv, ivlen) <= 0) |
0f113f3e MC |
87 | goto err; |
88 | piv = iv; | |
89 | } | |
924663c3 JZ |
90 | } else { |
91 | if (evp_cipher_asn1_to_param_ex(ctx, calg->parameter, &aparams) <= 0) { | |
9311d0c4 | 92 | ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); |
924663c3 JZ |
93 | goto err; |
94 | } | |
95 | if ((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) { | |
96 | piv = aparams.iv; | |
97 | if (ec->taglen > 0 | |
98 | && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, | |
99 | ec->taglen, ec->tag) <= 0) { | |
9311d0c4 | 100 | ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_AEAD_SET_TAG_ERROR); |
924663c3 JZ |
101 | goto err; |
102 | } | |
103 | } | |
0f113f3e | 104 | } |
c8ea9bc6 SL |
105 | len = EVP_CIPHER_CTX_key_length(ctx); |
106 | if (len <= 0) | |
107 | goto err; | |
108 | tkeylen = (size_t)len; | |
109 | ||
0f113f3e MC |
110 | /* Generate random session key */ |
111 | if (!enc || !ec->key) { | |
112 | tkey = OPENSSL_malloc(tkeylen); | |
90945fa3 | 113 | if (tkey == NULL) { |
9311d0c4 | 114 | ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
115 | goto err; |
116 | } | |
117 | if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0) | |
118 | goto err; | |
119 | } | |
146b52ed | 120 | |
0f113f3e MC |
121 | if (!ec->key) { |
122 | ec->key = tkey; | |
123 | ec->keylen = tkeylen; | |
124 | tkey = NULL; | |
125 | if (enc) | |
126 | keep_key = 1; | |
127 | else | |
128 | ERR_clear_error(); | |
146b52ed | 129 | |
0f113f3e | 130 | } |
e540d1cd | 131 | |
0f113f3e MC |
132 | if (ec->keylen != tkeylen) { |
133 | /* If necessary set key length */ | |
134 | if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) { | |
135 | /* | |
136 | * Only reveal failure if debugging so we don't leak information | |
137 | * which may be useful in MMA. | |
138 | */ | |
139 | if (enc || ec->debug) { | |
9311d0c4 | 140 | ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH); |
0f113f3e MC |
141 | goto err; |
142 | } else { | |
143 | /* Use random key */ | |
4b45c6e5 | 144 | OPENSSL_clear_free(ec->key, ec->keylen); |
0f113f3e MC |
145 | ec->key = tkey; |
146 | ec->keylen = tkeylen; | |
147 | tkey = NULL; | |
148 | ERR_clear_error(); | |
149 | } | |
150 | } | |
151 | } | |
5c4436c9 | 152 | |
0f113f3e | 153 | if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) { |
9311d0c4 | 154 | ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR); |
0f113f3e MC |
155 | goto err; |
156 | } | |
708cf5de DSH |
157 | if (enc) { |
158 | calg->parameter = ASN1_TYPE_new(); | |
159 | if (calg->parameter == NULL) { | |
9311d0c4 | 160 | ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE); |
708cf5de DSH |
161 | goto err; |
162 | } | |
924663c3 JZ |
163 | if ((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) { |
164 | memcpy(aparams.iv, piv, ivlen); | |
165 | aparams.iv_len = ivlen; | |
166 | aparams.tag_len = EVP_CIPHER_CTX_tag_length(ctx); | |
167 | if (aparams.tag_len <= 0) | |
168 | goto err; | |
169 | } | |
170 | ||
171 | if (evp_cipher_param_to_asn1_ex(ctx, calg->parameter, &aparams) <= 0) { | |
9311d0c4 | 172 | ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); |
708cf5de DSH |
173 | goto err; |
174 | } | |
175 | /* If parameter type not set omit parameter */ | |
176 | if (calg->parameter->type == V_ASN1_UNDEF) { | |
177 | ASN1_TYPE_free(calg->parameter); | |
178 | calg->parameter = NULL; | |
179 | } | |
0f113f3e MC |
180 | } |
181 | ok = 1; | |
5c4436c9 | 182 | |
0f113f3e | 183 | err: |
1acb2e6f | 184 | EVP_CIPHER_free(fetched_ciph); |
891eac46 | 185 | if (!keep_key || !ok) { |
4b45c6e5 | 186 | OPENSSL_clear_free(ec->key, ec->keylen); |
0f113f3e MC |
187 | ec->key = NULL; |
188 | } | |
4b45c6e5 | 189 | OPENSSL_clear_free(tkey, tkeylen); |
0f113f3e MC |
190 | if (ok) |
191 | return b; | |
192 | BIO_free(b); | |
193 | return NULL; | |
194 | } | |
195 | ||
196 | int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec, | |
197 | const EVP_CIPHER *cipher, | |
c1669f41 SL |
198 | const unsigned char *key, size_t keylen, |
199 | const CMS_CTX *cms_ctx) | |
0f113f3e MC |
200 | { |
201 | ec->cipher = cipher; | |
202 | if (key) { | |
cdb10bae | 203 | if ((ec->key = OPENSSL_malloc(keylen)) == NULL) { |
9311d0c4 | 204 | ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE); |
0f113f3e | 205 | return 0; |
cdb10bae | 206 | } |
0f113f3e MC |
207 | memcpy(ec->key, key, keylen); |
208 | } | |
209 | ec->keylen = keylen; | |
c1669f41 | 210 | if (cipher != NULL) |
0f113f3e MC |
211 | ec->contentType = OBJ_nid2obj(NID_pkcs7_data); |
212 | return 1; | |
213 | } | |
320bfc1b DSH |
214 | |
215 | int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph, | |
0f113f3e MC |
216 | const unsigned char *key, size_t keylen) |
217 | { | |
218 | CMS_EncryptedContentInfo *ec; | |
c1669f41 | 219 | |
0f113f3e | 220 | if (!key || !keylen) { |
9311d0c4 | 221 | ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY); |
0f113f3e MC |
222 | return 0; |
223 | } | |
224 | if (ciph) { | |
225 | cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData); | |
226 | if (!cms->d.encryptedData) { | |
9311d0c4 | 227 | ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
228 | return 0; |
229 | } | |
230 | cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted); | |
231 | cms->d.encryptedData->version = 0; | |
232 | } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) { | |
9311d0c4 | 233 | ERR_raise(ERR_LIB_CMS, CMS_R_NOT_ENCRYPTED_DATA); |
0f113f3e MC |
234 | return 0; |
235 | } | |
236 | ec = cms->d.encryptedData->encryptedContentInfo; | |
c1669f41 | 237 | return cms_EncryptedContent_init(ec, ciph, key, keylen, cms_get0_cmsctx(cms)); |
0f113f3e | 238 | } |
320bfc1b | 239 | |
9fdcc21f | 240 | BIO *cms_EncryptedData_init_bio(const CMS_ContentInfo *cms) |
0f113f3e MC |
241 | { |
242 | CMS_EncryptedData *enc = cms->d.encryptedData; | |
243 | if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs) | |
244 | enc->version = 2; | |
c1669f41 SL |
245 | return cms_EncryptedContent_init_bio(enc->encryptedContentInfo, |
246 | cms_get0_cmsctx(cms)); | |
0f113f3e | 247 | } |