1 /*
2 * Copyright 1995-2024 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_EVP_LIB);
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 goto err;
59 p = buf_in;
60
61 i2d(data, &p);
62 ret = EVP_VerifyInit_ex(ctx, type, NULL)
63 && EVP_VerifyUpdate(ctx, (unsigned char *)buf_in, inl);
64
65 OPENSSL_clear_free(buf_in, (unsigned int)inl);
66
67 if (!ret) {
68 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
69 goto err;
70 }
71 ret = -1;
72
73 if (EVP_VerifyFinal(ctx, (unsigned char *)signature->data,
74 (unsigned int)signature->length, pkey) <= 0) {
75 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
76 ret = 0;
77 goto err;
78 }
79 ret = 1;
80 err:
81 EVP_MD_CTX_free(ctx);
82 return ret;
83 }
84
85 #endif
86
ASN1_item_verify(const ASN1_ITEM * it,const X509_ALGOR * alg,const ASN1_BIT_STRING * signature,const void * data,EVP_PKEY * pkey)87 int ASN1_item_verify(const ASN1_ITEM *it, const X509_ALGOR *alg,
88 const ASN1_BIT_STRING *signature, const void *data,
89 EVP_PKEY *pkey)
90 {
91 return ASN1_item_verify_ex(it, alg, signature, data, NULL, pkey, NULL, NULL);
92 }
93
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)94 int ASN1_item_verify_ex(const ASN1_ITEM *it, const X509_ALGOR *alg,
95 const ASN1_BIT_STRING *signature, const void *data,
96 const ASN1_OCTET_STRING *id, EVP_PKEY *pkey,
97 OSSL_LIB_CTX *libctx, const char *propq)
98 {
99 EVP_MD_CTX *ctx;
100 int rv = -1;
101
102 if ((ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq)) != NULL) {
103 rv = ASN1_item_verify_ctx(it, alg, signature, data, ctx);
104 EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
105 EVP_MD_CTX_free(ctx);
106 }
107 return rv;
108 }
109
ASN1_item_verify_ctx(const ASN1_ITEM * it,const X509_ALGOR * alg,const ASN1_BIT_STRING * signature,const void * data,EVP_MD_CTX * ctx)110 int ASN1_item_verify_ctx(const ASN1_ITEM *it, const X509_ALGOR *alg,
111 const ASN1_BIT_STRING *signature, const void *data,
112 EVP_MD_CTX *ctx)
113 {
114 EVP_PKEY *pkey;
115 unsigned char *buf_in = NULL;
116 int ret = -1, inl = 0;
117 int mdnid, pknid;
118 size_t inll = 0;
119
120 pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
121
122 if (pkey == NULL) {
123 ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER);
124 return -1;
125 }
126
127 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
128 ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
129 return -1;
130 }
131
132 /* Convert signature OID into digest and public key OIDs */
133 if (!OBJ_find_sigid_algs(OBJ_obj2nid(alg->algorithm), &mdnid, &pknid)) {
134 ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
135 goto err;
136 }
137
138 if (mdnid == NID_undef && evp_pkey_is_legacy(pkey)) {
139 if (pkey->ameth == NULL || pkey->ameth->item_verify == NULL) {
140 ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
141 goto err;
142 }
143 ret = pkey->ameth->item_verify(ctx, it, data, alg, signature, pkey);
144 /*
145 * Return values meaning:
146 * <=0: error.
147 * 1: method does everything.
148 * 2: carry on as normal, method has called EVP_DigestVerifyInit()
149 */
150 if (ret <= 0)
151 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
152 if (ret <= 1)
153 goto err;
154 } else {
155 const EVP_MD *type = NULL;
156
157 /*
158 * We don't yet have the ability for providers to be able to handle
159 * X509_ALGOR style parameters. Fortunately the only one that needs this
160 * so far is RSA-PSS, so we just special case this for now. In some
161 * future version of OpenSSL we should push this to the provider.
162 */
163 if (mdnid == NID_undef && pknid == EVP_PKEY_RSA_PSS) {
164 if (!EVP_PKEY_is_a(pkey, "RSA") && !EVP_PKEY_is_a(pkey, "RSA-PSS")) {
165 ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
166 goto err;
167 }
168 /* This function also calls EVP_DigestVerifyInit */
169 if (ossl_rsa_pss_to_ctx(ctx, NULL, alg, pkey) <= 0) {
170 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
171 goto err;
172 }
173 } else {
174 /* Check public key OID matches public key type */
175 if (!EVP_PKEY_is_a(pkey, OBJ_nid2sn(pknid))) {
176 ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
177 goto err;
178 }
179
180 if (mdnid != NID_undef) {
181 type = EVP_get_digestbynid(mdnid);
182 if (type == NULL) {
183 ERR_raise_data(ERR_LIB_ASN1,
184 ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM,
185 "nid=0x%x", mdnid);
186 goto err;
187 }
188 }
189
190 /*
191 * Note that some algorithms (notably Ed25519 and Ed448) may allow
192 * a NULL digest value.
193 */
194 if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) {
195 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
196 ret = 0;
197 goto err;
198 }
199 }
200 }
201
202 inl = ASN1_item_i2d(data, &buf_in, it);
203 if (inl <= 0) {
204 ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
205 ret = -1;
206 goto err;
207 }
208 if (buf_in == NULL) {
209 ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
210 ret = -1;
211 goto err;
212 }
213 inll = inl;
214
215 ret = EVP_DigestVerify(ctx, signature->data, (size_t)signature->length,
216 buf_in, inl);
217 if (ret <= 0) {
218 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
219 goto err;
220 }
221 ret = 1;
222 err:
223 OPENSSL_clear_free(buf_in, inll);
224 return ret;
225 }
226
