1 /*
2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
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
8 */
9
10 #include <stdio.h>
11 #include <time.h>
12 #include <sys/types.h>
13
14 #include "internal/cryptlib.h"
15
16 #include <openssl/bn.h>
17 #include <openssl/x509.h>
18 #include <openssl/objects.h>
19 #include <openssl/buffer.h>
20 #include <openssl/evp.h>
21 #include "crypto/asn1.h"
22 #include "crypto/evp.h"
23 #include "crypto/rsa.h"
24
25 #ifndef OPENSSL_NO_DEPRECATED_3_0
26
ASN1_verify(i2d_of_void * i2d,X509_ALGOR * a,ASN1_BIT_STRING * signature,char * data,EVP_PKEY * pkey)27 int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,
28 char *data, EVP_PKEY *pkey)
29 {
30 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
31 const EVP_MD *type;
32 unsigned char *p, *buf_in = NULL;
33 int ret = -1, i, inl;
34
35 if (ctx == NULL) {
36 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
37 goto err;
38 }
39 i = OBJ_obj2nid(a->algorithm);
40 type = EVP_get_digestbyname(OBJ_nid2sn(i));
41 if (type == NULL) {
42 ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
43 goto err;
44 }
45
46 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
47 ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
48 goto err;
49 }
50
51 inl = i2d(data, NULL);
52 if (inl <= 0) {
53 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
54 goto err;
55 }
56 buf_in = OPENSSL_malloc((unsigned int)inl);
57 if (buf_in == NULL) {
58 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
59 goto err;
60 }
61 p = buf_in;
62
63 i2d(data, &p);
64 ret = EVP_VerifyInit_ex(ctx, type, NULL)
65 && EVP_VerifyUpdate(ctx, (unsigned char *)buf_in, inl);
66
67 OPENSSL_clear_free(buf_in, (unsigned int)inl);
68
69 if (!ret) {
70 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
71 goto err;
72 }
73 ret = -1;
74
75 if (EVP_VerifyFinal(ctx, (unsigned char *)signature->data,
76 (unsigned int)signature->length, pkey) <= 0) {
77 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
78 ret = 0;
79 goto err;
80 }
81 ret = 1;
82 err:
83 EVP_MD_CTX_free(ctx);
84 return ret;
85 }
86
87 #endif
88
ASN1_item_verify(const ASN1_ITEM * it,const X509_ALGOR * alg,const ASN1_BIT_STRING * signature,const void * data,EVP_PKEY * pkey)89 int ASN1_item_verify(const ASN1_ITEM *it, const X509_ALGOR *alg,
90 const ASN1_BIT_STRING *signature, const void *data,
91 EVP_PKEY *pkey)
92 {
93 return ASN1_item_verify_ex(it, alg, signature, data, NULL, pkey, NULL, NULL);
94 }
95
ASN1_item_verify_ex(const ASN1_ITEM * it,const X509_ALGOR * alg,const ASN1_BIT_STRING * signature,const void * data,const ASN1_OCTET_STRING * id,EVP_PKEY * pkey,OSSL_LIB_CTX * libctx,const char * propq)96 int ASN1_item_verify_ex(const ASN1_ITEM *it, const X509_ALGOR *alg,
97 const ASN1_BIT_STRING *signature, const void *data,
98 const ASN1_OCTET_STRING *id, EVP_PKEY *pkey,
99 OSSL_LIB_CTX *libctx, const char *propq)
100 {
101 EVP_MD_CTX *ctx;
102 int rv = -1;
103
104 if ((ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq)) != NULL) {
105 rv = ASN1_item_verify_ctx(it, alg, signature, data, ctx);
106 EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
107 EVP_MD_CTX_free(ctx);
108 }
109 return rv;
110 }
111
ASN1_item_verify_ctx(const ASN1_ITEM * it,const X509_ALGOR * alg,const ASN1_BIT_STRING * signature,const void * data,EVP_MD_CTX * ctx)112 int ASN1_item_verify_ctx(const ASN1_ITEM *it, const X509_ALGOR *alg,
113 const ASN1_BIT_STRING *signature, const void *data,
114 EVP_MD_CTX *ctx)
115 {
116 EVP_PKEY *pkey;
117 unsigned char *buf_in = NULL;
118 int ret = -1, inl = 0;
119 int mdnid, pknid;
120 size_t inll = 0;
121
122 pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
123
124 if (pkey == NULL) {
125 ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER);
126 return -1;
127 }
128
129 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
130 ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
131 return -1;
132 }
133
134 /* Convert signature OID into digest and public key OIDs */
135 if (!OBJ_find_sigid_algs(OBJ_obj2nid(alg->algorithm), &mdnid, &pknid)) {
136 ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
137 goto err;
138 }
139
140 if (mdnid == NID_undef && evp_pkey_is_legacy(pkey)) {
141 if (pkey->ameth == NULL || pkey->ameth->item_verify == NULL) {
142 ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
143 goto err;
144 }
145 ret = pkey->ameth->item_verify(ctx, it, data, alg, signature, pkey);
146 /*
147 * Return values meaning:
148 * <=0: error.
149 * 1: method does everything.
150 * 2: carry on as normal, method has called EVP_DigestVerifyInit()
151 */
152 if (ret <= 0)
153 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
154 if (ret <= 1)
155 goto err;
156 } else {
157 const EVP_MD *type = NULL;
158
159 /*
160 * We don't yet have the ability for providers to be able to handle
161 * X509_ALGOR style parameters. Fortunately the only one that needs this
162 * so far is RSA-PSS, so we just special case this for now. In some
163 * future version of OpenSSL we should push this to the provider.
164 */
165 if (mdnid == NID_undef && pknid == EVP_PKEY_RSA_PSS) {
166 if (!EVP_PKEY_is_a(pkey, "RSA") && !EVP_PKEY_is_a(pkey, "RSA-PSS")) {
167 ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
168 goto err;
169 }
170 /* This function also calls EVP_DigestVerifyInit */
171 if (ossl_rsa_pss_to_ctx(ctx, NULL, alg, pkey) <= 0) {
172 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
173 goto err;
174 }
175 } else {
176 /* Check public key OID matches public key type */
177 if (!EVP_PKEY_is_a(pkey, OBJ_nid2sn(pknid))) {
178 ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
179 goto err;
180 }
181
182 if (mdnid != NID_undef) {
183 type = EVP_get_digestbynid(mdnid);
184 if (type == NULL) {
185 ERR_raise(ERR_LIB_ASN1,
186 ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
187 goto err;
188 }
189 }
190
191 /*
192 * Note that some algorithms (notably Ed25519 and Ed448) may allow
193 * a NULL digest value.
194 */
195 if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) {
196 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
197 ret = 0;
198 goto err;
199 }
200 }
201 }
202
203 inl = ASN1_item_i2d(data, &buf_in, it);
204 if (inl <= 0) {
205 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
206 goto err;
207 }
208 if (buf_in == NULL) {
209 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
210 goto err;
211 }
212 inll = inl;
213
214 ret = EVP_DigestVerify(ctx, signature->data, (size_t)signature->length,
215 buf_in, inl);
216 if (ret <= 0) {
217 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
218 goto err;
219 }
220 ret = 1;
221 err:
222 OPENSSL_clear_free(buf_in, inll);
223 return ret;
224 }
225