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Commit | Line | Data |
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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> | |
706457b7 | 17 | #include "cms_local.h" |
5c4436c9 DSH |
18 | |
19 | /* CMS EncryptedData Utilities */ | |
20 | ||
320bfc1b DSH |
21 | /* Return BIO based on EncryptedContentInfo and key */ |
22 | ||
c1669f41 SL |
23 | BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec, |
24 | const CMS_CTX *cms_ctx) | |
0f113f3e MC |
25 | { |
26 | BIO *b; | |
27 | EVP_CIPHER_CTX *ctx; | |
c1669f41 SL |
28 | EVP_CIPHER *fetched_ciph = NULL; |
29 | const EVP_CIPHER *cipher = NULL; | |
0f113f3e MC |
30 | X509_ALGOR *calg = ec->contentEncryptionAlgorithm; |
31 | unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL; | |
32 | unsigned char *tkey = NULL; | |
c8ea9bc6 | 33 | int len; |
0f113f3e | 34 | size_t tkeylen = 0; |
0f113f3e | 35 | int ok = 0; |
0f113f3e | 36 | int enc, keep_key = 0; |
5c4436c9 | 37 | |
0f113f3e | 38 | enc = ec->cipher ? 1 : 0; |
5c4436c9 | 39 | |
0f113f3e | 40 | b = BIO_new(BIO_f_cipher()); |
90945fa3 | 41 | if (b == NULL) { |
0f113f3e MC |
42 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); |
43 | return NULL; | |
44 | } | |
5c4436c9 | 45 | |
0f113f3e | 46 | BIO_get_cipher_ctx(b, &ctx); |
5c4436c9 | 47 | |
0f113f3e | 48 | if (enc) { |
c1669f41 | 49 | cipher = ec->cipher; |
0f113f3e MC |
50 | /* |
51 | * If not keeping key set cipher to NULL so subsequent calls decrypt. | |
52 | */ | |
c1669f41 | 53 | if (ec->key != NULL) |
0f113f3e MC |
54 | ec->cipher = NULL; |
55 | } else { | |
c1669f41 SL |
56 | cipher = EVP_get_cipherbyobj(calg->algorithm); |
57 | } | |
58 | if (cipher != NULL) { | |
59 | fetched_ciph = EVP_CIPHER_fetch(cms_ctx->libctx, EVP_CIPHER_name(cipher), | |
60 | cms_ctx->propq); | |
61 | if (fetched_ciph == NULL) { | |
0f113f3e MC |
62 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, CMS_R_UNKNOWN_CIPHER); |
63 | goto err; | |
64 | } | |
65 | } | |
c1669f41 | 66 | if (EVP_CipherInit_ex(ctx, fetched_ciph, NULL, NULL, NULL, enc) <= 0) { |
0f113f3e MC |
67 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, |
68 | CMS_R_CIPHER_INITIALISATION_ERROR); | |
69 | goto err; | |
70 | } | |
c1669f41 | 71 | EVP_CIPHER_free(fetched_ciph); |
5c4436c9 | 72 | |
0f113f3e MC |
73 | if (enc) { |
74 | int ivlen; | |
75 | calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx)); | |
76 | /* Generate a random IV if we need one */ | |
77 | ivlen = EVP_CIPHER_CTX_iv_length(ctx); | |
78 | if (ivlen > 0) { | |
c1669f41 | 79 | if (RAND_bytes_ex(cms_ctx->libctx, iv, ivlen) <= 0) |
0f113f3e MC |
80 | goto err; |
81 | piv = iv; | |
82 | } | |
83 | } else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0) { | |
84 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
85 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); | |
86 | goto err; | |
87 | } | |
c8ea9bc6 SL |
88 | len = EVP_CIPHER_CTX_key_length(ctx); |
89 | if (len <= 0) | |
90 | goto err; | |
91 | tkeylen = (size_t)len; | |
92 | ||
0f113f3e MC |
93 | /* Generate random session key */ |
94 | if (!enc || !ec->key) { | |
95 | tkey = OPENSSL_malloc(tkeylen); | |
90945fa3 | 96 | if (tkey == NULL) { |
0f113f3e MC |
97 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); |
98 | goto err; | |
99 | } | |
100 | if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0) | |
101 | goto err; | |
102 | } | |
146b52ed | 103 | |
0f113f3e MC |
104 | if (!ec->key) { |
105 | ec->key = tkey; | |
106 | ec->keylen = tkeylen; | |
107 | tkey = NULL; | |
108 | if (enc) | |
109 | keep_key = 1; | |
110 | else | |
111 | ERR_clear_error(); | |
146b52ed | 112 | |
0f113f3e | 113 | } |
e540d1cd | 114 | |
0f113f3e MC |
115 | if (ec->keylen != tkeylen) { |
116 | /* If necessary set key length */ | |
117 | if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) { | |
118 | /* | |
119 | * Only reveal failure if debugging so we don't leak information | |
120 | * which may be useful in MMA. | |
121 | */ | |
122 | if (enc || ec->debug) { | |
123 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
124 | CMS_R_INVALID_KEY_LENGTH); | |
125 | goto err; | |
126 | } else { | |
127 | /* Use random key */ | |
4b45c6e5 | 128 | OPENSSL_clear_free(ec->key, ec->keylen); |
0f113f3e MC |
129 | ec->key = tkey; |
130 | ec->keylen = tkeylen; | |
131 | tkey = NULL; | |
132 | ERR_clear_error(); | |
133 | } | |
134 | } | |
135 | } | |
5c4436c9 | 136 | |
0f113f3e MC |
137 | if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) { |
138 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
139 | CMS_R_CIPHER_INITIALISATION_ERROR); | |
140 | goto err; | |
141 | } | |
708cf5de DSH |
142 | if (enc) { |
143 | calg->parameter = ASN1_TYPE_new(); | |
144 | if (calg->parameter == NULL) { | |
145 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE); | |
146 | goto err; | |
147 | } | |
148 | if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0) { | |
149 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, | |
150 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR); | |
151 | goto err; | |
152 | } | |
153 | /* If parameter type not set omit parameter */ | |
154 | if (calg->parameter->type == V_ASN1_UNDEF) { | |
155 | ASN1_TYPE_free(calg->parameter); | |
156 | calg->parameter = NULL; | |
157 | } | |
0f113f3e MC |
158 | } |
159 | ok = 1; | |
5c4436c9 | 160 | |
0f113f3e | 161 | err: |
891eac46 | 162 | if (!keep_key || !ok) { |
4b45c6e5 | 163 | OPENSSL_clear_free(ec->key, ec->keylen); |
0f113f3e MC |
164 | ec->key = NULL; |
165 | } | |
4b45c6e5 | 166 | OPENSSL_clear_free(tkey, tkeylen); |
0f113f3e MC |
167 | if (ok) |
168 | return b; | |
169 | BIO_free(b); | |
170 | return NULL; | |
171 | } | |
172 | ||
173 | int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec, | |
174 | const EVP_CIPHER *cipher, | |
c1669f41 SL |
175 | const unsigned char *key, size_t keylen, |
176 | const CMS_CTX *cms_ctx) | |
0f113f3e MC |
177 | { |
178 | ec->cipher = cipher; | |
179 | if (key) { | |
cdb10bae RS |
180 | if ((ec->key = OPENSSL_malloc(keylen)) == NULL) { |
181 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT, ERR_R_MALLOC_FAILURE); | |
0f113f3e | 182 | return 0; |
cdb10bae | 183 | } |
0f113f3e MC |
184 | memcpy(ec->key, key, keylen); |
185 | } | |
186 | ec->keylen = keylen; | |
c1669f41 | 187 | if (cipher != NULL) |
0f113f3e MC |
188 | ec->contentType = OBJ_nid2obj(NID_pkcs7_data); |
189 | return 1; | |
190 | } | |
320bfc1b DSH |
191 | |
192 | int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph, | |
0f113f3e MC |
193 | const unsigned char *key, size_t keylen) |
194 | { | |
195 | CMS_EncryptedContentInfo *ec; | |
c1669f41 | 196 | |
0f113f3e MC |
197 | if (!key || !keylen) { |
198 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY); | |
199 | return 0; | |
200 | } | |
201 | if (ciph) { | |
202 | cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData); | |
203 | if (!cms->d.encryptedData) { | |
204 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, ERR_R_MALLOC_FAILURE); | |
205 | return 0; | |
206 | } | |
207 | cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted); | |
208 | cms->d.encryptedData->version = 0; | |
209 | } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) { | |
210 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NOT_ENCRYPTED_DATA); | |
211 | return 0; | |
212 | } | |
213 | ec = cms->d.encryptedData->encryptedContentInfo; | |
c1669f41 | 214 | return cms_EncryptedContent_init(ec, ciph, key, keylen, cms_get0_cmsctx(cms)); |
0f113f3e | 215 | } |
320bfc1b | 216 | |
9fdcc21f | 217 | BIO *cms_EncryptedData_init_bio(const CMS_ContentInfo *cms) |
0f113f3e MC |
218 | { |
219 | CMS_EncryptedData *enc = cms->d.encryptedData; | |
220 | if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs) | |
221 | enc->version = 2; | |
c1669f41 SL |
222 | return cms_EncryptedContent_init_bio(enc->encryptedContentInfo, |
223 | cms_get0_cmsctx(cms)); | |
0f113f3e | 224 | } |