Coverage Report

Created: 2024-11-21 07:03

/src/openssl/crypto/asn1/a_verify.c
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Count
Source (jump to first uncovered line)
1
/*
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 * Copyright 1995-2024 The OpenSSL Project Authors. All Rights Reserved.
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 *
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 * Licensed under the Apache License 2.0 (the "License").  You may not use
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 * this file except in compliance with the License.  You can obtain a copy
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 * in the file LICENSE in the source distribution or at
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 * https://www.openssl.org/source/license.html
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 */
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#include <stdio.h>
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#include <time.h>
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#include <sys/types.h>
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#include "internal/cryptlib.h"
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#include <openssl/bn.h>
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#include <openssl/x509.h>
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#include <openssl/objects.h>
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#include <openssl/buffer.h>
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#include <openssl/evp.h>
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#include "crypto/asn1.h"
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#include "crypto/evp.h"
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#include "crypto/rsa.h"
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#ifndef OPENSSL_NO_DEPRECATED_3_0
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int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,
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                char *data, EVP_PKEY *pkey)
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0
{
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0
    EVP_MD_CTX *ctx = EVP_MD_CTX_new();
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0
    const EVP_MD *type;
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0
    unsigned char *p, *buf_in = NULL;
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0
    int ret = -1, i, inl;
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0
    if (ctx == NULL) {
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0
        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
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0
        goto err;
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0
    }
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0
    i = OBJ_obj2nid(a->algorithm);
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0
    type = EVP_get_digestbyname(OBJ_nid2sn(i));
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0
    if (type == NULL) {
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0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
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0
        goto err;
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0
    }
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0
    if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
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0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
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0
        goto err;
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0
    }
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0
    inl = i2d(data, NULL);
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0
    if (inl <= 0) {
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0
        ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
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0
        goto err;
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0
    }
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0
    buf_in = OPENSSL_malloc((unsigned int)inl);
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0
    if (buf_in == NULL)
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0
        goto err;
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0
    p = buf_in;
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0
    i2d(data, &p);
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0
    ret = EVP_VerifyInit_ex(ctx, type, NULL)
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0
        && EVP_VerifyUpdate(ctx, (unsigned char *)buf_in, inl);
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0
    OPENSSL_clear_free(buf_in, (unsigned int)inl);
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0
    if (!ret) {
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0
        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
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0
        goto err;
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0
    }
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0
    ret = -1;
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0
    if (EVP_VerifyFinal(ctx, (unsigned char *)signature->data,
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0
                        (unsigned int)signature->length, pkey) <= 0) {
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0
        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
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0
        ret = 0;
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0
        goto err;
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0
    }
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0
    ret = 1;
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0
 err:
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0
    EVP_MD_CTX_free(ctx);
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0
    return ret;
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0
}
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#endif
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int ASN1_item_verify(const ASN1_ITEM *it, const X509_ALGOR *alg,
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                     const ASN1_BIT_STRING *signature, const void *data,
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                     EVP_PKEY *pkey)
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0
{
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0
    return ASN1_item_verify_ex(it, alg, signature, data, NULL, pkey, NULL, NULL);
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0
}
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int ASN1_item_verify_ex(const ASN1_ITEM *it, const X509_ALGOR *alg,
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                        const ASN1_BIT_STRING *signature, const void *data,
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                        const ASN1_OCTET_STRING *id, EVP_PKEY *pkey,
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                        OSSL_LIB_CTX *libctx, const char *propq)
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0
{
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0
    EVP_MD_CTX *ctx;
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0
    int rv = -1;
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0
    if ((ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq)) != NULL) {
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0
        rv = ASN1_item_verify_ctx(it, alg, signature, data, ctx);
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0
        EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
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0
        EVP_MD_CTX_free(ctx);
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0
    }
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0
    return rv;
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0
}
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int ASN1_item_verify_ctx(const ASN1_ITEM *it, const X509_ALGOR *alg,
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                         const ASN1_BIT_STRING *signature, const void *data,
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                         EVP_MD_CTX *ctx)
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0
{
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0
    EVP_PKEY *pkey;
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0
    unsigned char *buf_in = NULL;
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0
    int ret = -1, inl = 0;
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0
    int mdnid, pknid;
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0
    size_t inll = 0;
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120
0
    pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
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122
0
    if (pkey == NULL) {
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0
        ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER);
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0
        return -1;
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0
    }
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0
    if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
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0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
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0
        return -1;
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0
    }
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    /* Convert signature OID into digest and public key OIDs */
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0
    if (!OBJ_find_sigid_algs(OBJ_obj2nid(alg->algorithm), &mdnid, &pknid)) {
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0
        ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
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0
        goto err;
136
0
    }
137
138
0
    if (mdnid == NID_undef && evp_pkey_is_legacy(pkey)) {
139
0
        if (pkey->ameth == NULL || pkey->ameth->item_verify == NULL) {
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0
            ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
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0
            goto err;
142
0
        }
143
0
        ret = pkey->ameth->item_verify(ctx, it, data, alg, signature, pkey);
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        /*
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         * Return values meaning:
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         * <=0: error.
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         *   1: method does everything.
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         *   2: carry on as normal, method has called EVP_DigestVerifyInit()
149
         */
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0
        if (ret <= 0)
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0
            ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
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0
        if (ret <= 1)
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0
            goto err;
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0
    } else {
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0
        const EVP_MD *type = NULL;
156
157
        /*
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         * We don't yet have the ability for providers to be able to handle
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         * 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.
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         */
163
0
        if (mdnid == NID_undef && pknid == EVP_PKEY_RSA_PSS) {
164
0
            if (!EVP_PKEY_is_a(pkey, "RSA") && !EVP_PKEY_is_a(pkey, "RSA-PSS")) {
165
0
                ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
166
0
                goto err;
167
0
            }
168
            /* This function also calls EVP_DigestVerifyInit */
169
0
            if (ossl_rsa_pss_to_ctx(ctx, NULL, alg, pkey) <= 0) {
170
0
                ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
171
0
                goto err;
172
0
            }
173
0
        } else {
174
            /* Check public key OID matches public key type */
175
0
            if (!EVP_PKEY_is_a(pkey, OBJ_nid2sn(pknid))) {
176
0
                ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
177
0
                goto err;
178
0
            }
179
180
0
            if (mdnid != NID_undef) {
181
0
                type = EVP_get_digestbynid(mdnid);
182
0
                if (type == NULL) {
183
0
                    ERR_raise_data(ERR_LIB_ASN1,
184
0
                                   ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM,
185
0
                                   "nid=0x%x", mdnid);
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0
                    goto err;
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0
                }
188
0
            }
189
190
            /*
191
             * Note that some algorithms (notably Ed25519 and Ed448) may allow
192
             * a NULL digest value.
193
             */
194
0
            if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) {
195
0
                ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
196
0
                ret = 0;
197
0
                goto err;
198
0
            }
199
0
        }
200
0
    }
201
202
0
    inl = ASN1_item_i2d(data, &buf_in, it);
203
0
    if (inl <= 0) {
204
0
        ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
205
0
        ret = -1;
206
0
        goto err;
207
0
    }
208
0
    if (buf_in == NULL) {
209
0
        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
210
0
        ret = -1;
211
0
        goto err;
212
0
    }
213
0
    inll = inl;
214
215
0
    ret = EVP_DigestVerify(ctx, signature->data, (size_t)signature->length,
216
0
                           buf_in, inl);
217
0
    if (ret <= 0) {
218
0
        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
219
0
        goto err;
220
0
    }
221
0
    ret = 1;
222
0
 err:
223
0
    OPENSSL_clear_free(buf_in, inll);
224
0
    return ret;
225
0
}