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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/ssh/lib/../ssh-ecdsa.c	Lines:	29	75	38.7 %
Date:	2017-11-07	Branches:	17	73	23.3 %


/* $OpenBSD: ssh-ecdsa.c,v 1.13 2016/04/21 06:08:02 djm Exp $ */
/*
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 * Copyright (c) 2010 Damien Miller.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>

#include <openssl/bn.h>
#include <openssl/ec.h>
#include <openssl/ecdsa.h>
#include <openssl/evp.h>

#include <string.h>

#include "sshbuf.h"
#include "ssherr.h"
#include "digest.h"
#define SSHKEY_INTERNAL
#include "sshkey.h"

/* ARGSUSED */
int
ssh_ecdsa_sign(const struct sshkey *key, u_char **sigp, size_t *lenp,
    const u_char *data, size_t datalen, u_int compat)
{
	ECDSA_SIG *sig = NULL;
	int hash_alg;
	u_char digest[SSH_DIGEST_MAX_LENGTH];
	size_t len, dlen;
	struct sshbuf *b = NULL, *bb = NULL;
	int ret = SSH_ERR_INTERNAL_ERROR;

	if (lenp != NULL)
		*lenp = 0;
	if (sigp != NULL)
		*sigp = NULL;

	if (key == NULL || key->ecdsa == NULL ||
	    sshkey_type_plain(key->type) != KEY_ECDSA)
		return SSH_ERR_INVALID_ARGUMENT;

	if ((hash_alg = sshkey_ec_nid_to_hash_alg(key->ecdsa_nid)) == -1 ||
	    (dlen = ssh_digest_bytes(hash_alg)) == 0)
		return SSH_ERR_INTERNAL_ERROR;
	if ((ret = ssh_digest_memory(hash_alg, data, datalen,
	    digest, sizeof(digest))) != 0)
		goto out;

	if ((sig = ECDSA_do_sign(digest, dlen, key->ecdsa)) == NULL) {
		ret = SSH_ERR_LIBCRYPTO_ERROR;
		goto out;
	}

	if ((bb = sshbuf_new()) == NULL || (b = sshbuf_new()) == NULL) {
		ret = SSH_ERR_ALLOC_FAIL;
		goto out;
	}
	if ((ret = sshbuf_put_bignum2(bb, sig->r)) != 0 ||
	    (ret = sshbuf_put_bignum2(bb, sig->s)) != 0)
		goto out;
	if ((ret = sshbuf_put_cstring(b, sshkey_ssh_name_plain(key))) != 0 ||
	    (ret = sshbuf_put_stringb(b, bb)) != 0)
		goto out;
	len = sshbuf_len(b);
	if (sigp != NULL) {
		if ((*sigp = malloc(len)) == NULL) {
			ret = SSH_ERR_ALLOC_FAIL;
			goto out;
		}
		memcpy(*sigp, sshbuf_ptr(b), len);
	}
	if (lenp != NULL)
		*lenp = len;
	ret = 0;
 out:
	explicit_bzero(digest, sizeof(digest));
	sshbuf_free(b);
	sshbuf_free(bb);
	if (sig != NULL)
		ECDSA_SIG_free(sig);
	return ret;
}

/* ARGSUSED */
int
ssh_ecdsa_verify(const struct sshkey *key,
    const u_char *signature, size_t signaturelen,
    const u_char *data, size_t datalen, u_int compat)
{
	ECDSA_SIG *sig = NULL;
	int hash_alg;
	u_char digest[SSH_DIGEST_MAX_LENGTH];
	size_t dlen;
	int ret = SSH_ERR_INTERNAL_ERROR;
	struct sshbuf *b = NULL, *sigbuf = NULL;
	char *ktype = NULL;

	if (key == NULL || key->ecdsa == NULL ||
	    sshkey_type_plain(key->type) != KEY_ECDSA ||
	    signature == NULL || signaturelen == 0)
		return SSH_ERR_INVALID_ARGUMENT;

	if ((hash_alg = sshkey_ec_nid_to_hash_alg(key->ecdsa_nid)) == -1 ||
	    (dlen = ssh_digest_bytes(hash_alg)) == 0)
		return SSH_ERR_INTERNAL_ERROR;

	/* fetch signature */
	if ((b = sshbuf_from(signature, signaturelen)) == NULL)
		return SSH_ERR_ALLOC_FAIL;
	if (sshbuf_get_cstring(b, &ktype, NULL) != 0 ||
	    sshbuf_froms(b, &sigbuf) != 0) {
		ret = SSH_ERR_INVALID_FORMAT;
		goto out;
	}
	if (strcmp(sshkey_ssh_name_plain(key), ktype) != 0) {
		ret = SSH_ERR_KEY_TYPE_MISMATCH;
		goto out;
	}
	if (sshbuf_len(b) != 0) {
		ret = SSH_ERR_UNEXPECTED_TRAILING_DATA;
		goto out;
	}

	/* parse signature */
	if ((sig = ECDSA_SIG_new()) == NULL) {
		ret = SSH_ERR_ALLOC_FAIL;
		goto out;
	}
	if (sshbuf_get_bignum2(sigbuf, sig->r) != 0 ||
	    sshbuf_get_bignum2(sigbuf, sig->s) != 0) {
		ret = SSH_ERR_INVALID_FORMAT;
		goto out;
	}
	if (sshbuf_len(sigbuf) != 0) {
		ret = SSH_ERR_UNEXPECTED_TRAILING_DATA;
		goto out;
	}
	if ((ret = ssh_digest_memory(hash_alg, data, datalen,
	    digest, sizeof(digest))) != 0)
		goto out;

	switch (ECDSA_do_verify(digest, dlen, sig, key->ecdsa)) {
	case 1:
		ret = 0;
		break;
	case 0:
		ret = SSH_ERR_SIGNATURE_INVALID;
		goto out;
	default:
		ret = SSH_ERR_LIBCRYPTO_ERROR;
		goto out;
	}

 out:
	explicit_bzero(digest, sizeof(digest));
	sshbuf_free(sigbuf);
	sshbuf_free(b);
	if (sig != NULL)
		ECDSA_SIG_free(sig);
	free(ktype);
	return ret;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: ssh-ecdsa.c,v 1.13 2016/04/21 06:08:02 djm Exp $ */
2			/*
3			* Copyright (c) 2000 Markus Friedl. All rights reserved.
4			* Copyright (c) 2010 Damien Miller. All rights reserved.
5			*
6			* Redistribution and use in source and binary forms, with or without
7			* modification, are permitted provided that the following conditions
8			* are met:
9			* 1. Redistributions of source code must retain the above copyright
10			* notice, this list of conditions and the following disclaimer.
11			* 2. Redistributions in binary form must reproduce the above copyright
12			* notice, this list of conditions and the following disclaimer in the
13			* documentation and/or other materials provided with the distribution.
14			*
15			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25			*/
26
27			#include <sys/types.h>
28
29			#include <openssl/bn.h>
30			#include <openssl/ec.h>
31			#include <openssl/ecdsa.h>
32			#include <openssl/evp.h>
33
34			#include <string.h>
35
36			#include "sshbuf.h"
37			#include "ssherr.h"
38			#include "digest.h"
39			#define SSHKEY_INTERNAL
40			#include "sshkey.h"
41
42			/* ARGSUSED */
43			int
44			ssh_ecdsa_sign(const struct sshkey key, u_char sigp, size_t lenp,
45			const u_char *data, size_t datalen, u_int compat)
46			{
47			ECDSA_SIG *sig = NULL;
48			int hash_alg;
49			u_char digest[SSH_DIGEST_MAX_LENGTH];
50			size_t len, dlen;
51			struct sshbuf b = NULL, bb = NULL;
52			int ret = SSH_ERR_INTERNAL_ERROR;
53
54			if (lenp != NULL)
55			*lenp = 0;
56			if (sigp != NULL)
57			*sigp = NULL;
58
59			if (key == NULL \|\| key->ecdsa == NULL \|\|
60			sshkey_type_plain(key->type) != KEY_ECDSA)
61			return SSH_ERR_INVALID_ARGUMENT;
62
63			if ((hash_alg = sshkey_ec_nid_to_hash_alg(key->ecdsa_nid)) == -1 \|\|
64			(dlen = ssh_digest_bytes(hash_alg)) == 0)
65			return SSH_ERR_INTERNAL_ERROR;
66			if ((ret = ssh_digest_memory(hash_alg, data, datalen,
67			digest, sizeof(digest))) != 0)
68			goto out;
69
70			if ((sig = ECDSA_do_sign(digest, dlen, key->ecdsa)) == NULL) {
71			ret = SSH_ERR_LIBCRYPTO_ERROR;
72			goto out;
73			}
74
75			if ((bb = sshbuf_new()) == NULL \|\| (b = sshbuf_new()) == NULL) {
76			ret = SSH_ERR_ALLOC_FAIL;
77			goto out;
78			}
79			if ((ret = sshbuf_put_bignum2(bb, sig->r)) != 0 \|\|
80			(ret = sshbuf_put_bignum2(bb, sig->s)) != 0)
81			goto out;
82			if ((ret = sshbuf_put_cstring(b, sshkey_ssh_name_plain(key))) != 0 \|\|
83			(ret = sshbuf_put_stringb(b, bb)) != 0)
84			goto out;
85			len = sshbuf_len(b);
86			if (sigp != NULL) {
87			if ((*sigp = malloc(len)) == NULL) {
88			ret = SSH_ERR_ALLOC_FAIL;
89			goto out;
90			}
91			memcpy(*sigp, sshbuf_ptr(b), len);
92			}
93			if (lenp != NULL)
94			*lenp = len;
95			ret = 0;
96			out:
97			explicit_bzero(digest, sizeof(digest));
98			sshbuf_free(b);
99			sshbuf_free(bb);
100			if (sig != NULL)
101			ECDSA_SIG_free(sig);
102			return ret;
103			}
104
105			/* ARGSUSED */
106			int
107			ssh_ecdsa_verify(const struct sshkey *key,
108			const u_char *signature, size_t signaturelen,
109			const u_char *data, size_t datalen, u_int compat)
110			{
111			ECDSA_SIG *sig = NULL;
112			int hash_alg;
113		2	u_char digest[SSH_DIGEST_MAX_LENGTH];
114			size_t dlen;
115			int ret = SSH_ERR_INTERNAL_ERROR;
116		1	struct sshbuf b = NULL, sigbuf = NULL;
117		1	char *ktype = NULL;
118
119	✓✗✓✗	2	if (key == NULL \|\| key->ecdsa == NULL \|\|
120	✗✓	3	sshkey_type_plain(key->type) != KEY_ECDSA \|\|
121		2	signature == NULL \|\| signaturelen == 0)
122			return SSH_ERR_INVALID_ARGUMENT;
123
124	✓✗✗✓	2	if ((hash_alg = sshkey_ec_nid_to_hash_alg(key->ecdsa_nid)) == -1 \|\|
125		1	(dlen = ssh_digest_bytes(hash_alg)) == 0)
126			return SSH_ERR_INTERNAL_ERROR;
127
128			/* fetch signature */
129	✗✓	1	if ((b = sshbuf_from(signature, signaturelen)) == NULL)
130			return SSH_ERR_ALLOC_FAIL;
131	✓✗✗✓	2	if (sshbuf_get_cstring(b, &ktype, NULL) != 0 \|\|
132		1	sshbuf_froms(b, &sigbuf) != 0) {
133			ret = SSH_ERR_INVALID_FORMAT;
134			goto out;
135			}
136	✗✓	1	if (strcmp(sshkey_ssh_name_plain(key), ktype) != 0) {
137			ret = SSH_ERR_KEY_TYPE_MISMATCH;
138			goto out;
139			}
140	✗✓	1	if (sshbuf_len(b) != 0) {
141			ret = SSH_ERR_UNEXPECTED_TRAILING_DATA;
142			goto out;
143			}
144
145			/* parse signature */
146	✗✓	1	if ((sig = ECDSA_SIG_new()) == NULL) {
147			ret = SSH_ERR_ALLOC_FAIL;
148			goto out;
149			}
150	✓✗✗✓	2	if (sshbuf_get_bignum2(sigbuf, sig->r) != 0 \|\|
151		1	sshbuf_get_bignum2(sigbuf, sig->s) != 0) {
152			ret = SSH_ERR_INVALID_FORMAT;
153			goto out;
154			}
155	✗✓	1	if (sshbuf_len(sigbuf) != 0) {
156			ret = SSH_ERR_UNEXPECTED_TRAILING_DATA;
157			goto out;
158			}
159	✓✗	2	if ((ret = ssh_digest_memory(hash_alg, data, datalen,
160		2	digest, sizeof(digest))) != 0)
161			goto out;
162
163	✓✗✗	1	switch (ECDSA_do_verify(digest, dlen, sig, key->ecdsa)) {
164			case 1:
165			ret = 0;
166			break;
167			case 0:
168			ret = SSH_ERR_SIGNATURE_INVALID;
169			goto out;
170			default:
171			ret = SSH_ERR_LIBCRYPTO_ERROR;
172			goto out;
173		1	}
174
175			out:
176		1	explicit_bzero(digest, sizeof(digest));
177		1	sshbuf_free(sigbuf);
178		1	sshbuf_free(b);
179	✓✗	1	if (sig != NULL)
180		1	ECDSA_SIG_free(sig);
181		1	free(ktype);
182		1	return ret;
183		1	}