[openssh.git] / hostfile.c

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Functions for manipulating the known hosts files.
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 *
 *
 * Copyright (c) 1999, 2000 Markus Friedl.  All rights reserved.
 * Copyright (c) 1999 Niels Provos.  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 "includes.h"

#include <resolv.h>

#include <openssl/hmac.h>
#include <openssl/sha.h>

#include "match.h"
#include "key.h"
#include "hostfile.h"
#include "log.h"
#include "xmalloc.h"

static int
extract_salt(const char *s, u_int l, char *salt, size_t salt_len)
{
	char *p, *b64salt;
	u_int b64len;
	int ret;

	if (l < sizeof(HASH_MAGIC) - 1) {
		debug2("extract_salt: string too short");
		return (-1);
	}
	if (strncmp(s, HASH_MAGIC, sizeof(HASH_MAGIC) - 1) != 0) {
		debug2("extract_salt: invalid magic identifier");
		return (-1);
	}
	s += sizeof(HASH_MAGIC) - 1;
	l -= sizeof(HASH_MAGIC) - 1;
	if ((p = memchr(s, HASH_DELIM, l)) == NULL) {
		debug2("extract_salt: missing salt termination character");
		return (-1);
	}

	b64len = p - s;
	/* Sanity check */
	if (b64len == 0 || b64len > 1024) {
		debug2("extract_salt: bad encoded salt length %u", b64len);
		return (-1);
	}
	b64salt = xmalloc(1 + b64len);
	memcpy(b64salt, s, b64len);
	b64salt[b64len] = '\0';

	ret = __b64_pton(b64salt, salt, salt_len);
	xfree(b64salt);
	if (ret == -1) {
		debug2("extract_salt: salt decode error");
		return (-1);
	}
	if (ret != SHA_DIGEST_LENGTH) {
		debug2("extract_salt: expected salt len %d, got %d",
		    SHA_DIGEST_LENGTH, ret);
		return (-1);
	}

	return (0);
}

char *
host_hash(const char *host, const char *name_from_hostfile, u_int src_len)
{
	const EVP_MD *md = EVP_sha1();
	HMAC_CTX mac_ctx;
	char salt[256], result[256], uu_salt[512], uu_result[512];
	static char encoded[1024];
	u_int i, len;

	len = EVP_MD_size(md);

	if (name_from_hostfile == NULL) {
		/* Create new salt */
		for (i = 0; i < len; i++)
			salt[i] = arc4random();
	} else {
		/* Extract salt from known host entry */
		if (extract_salt(name_from_hostfile, src_len, salt,
		    sizeof(salt)) == -1)
			return (NULL);
	}

	HMAC_Init(&mac_ctx, salt, len, md);
	HMAC_Update(&mac_ctx, host, strlen(host));
	HMAC_Final(&mac_ctx, result, NULL);
	HMAC_cleanup(&mac_ctx);

	if (__b64_ntop(salt, len, uu_salt, sizeof(uu_salt)) == -1 ||
	    __b64_ntop(result, len, uu_result, sizeof(uu_result)) == -1)
		fatal("host_hash: __b64_ntop failed");

	snprintf(encoded, sizeof(encoded), "%s%s%c%s", HASH_MAGIC, uu_salt,
	    HASH_DELIM, uu_result);

	return (encoded);
}

/*
 * Parses an RSA (number of bits, e, n) or DSA key from a string.  Moves the
 * pointer over the key.  Skips any whitespace at the beginning and at end.
 */

int
hostfile_read_key(char **cpp, u_int *bitsp, Key *ret)
{
	char *cp;

	/* Skip leading whitespace. */
	for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
		;

	if (key_read(ret, &cp) != 1)
		return 0;

	/* Skip trailing whitespace. */
	for (; *cp == ' ' || *cp == '\t'; cp++)
		;

	/* Return results. */
	*cpp = cp;
	*bitsp = key_size(ret);
	return 1;
}

static int
hostfile_check_key(int bits, const Key *key, const char *host, const char *filename, int linenum)
{
	if (key == NULL || key->type != KEY_RSA1 || key->rsa == NULL)
		return 1;
	if (bits != BN_num_bits(key->rsa->n)) {
		logit("Warning: %s, line %d: keysize mismatch for host %s: "
		    "actual %d vs. announced %d.",
		    filename, linenum, host, BN_num_bits(key->rsa->n), bits);
		logit("Warning: replace %d with %d in %s, line %d.",
		    bits, BN_num_bits(key->rsa->n), filename, linenum);
	}
	return 1;
}

/*
 * Checks whether the given host (which must be in all lowercase) is already
 * in the list of our known hosts. Returns HOST_OK if the host is known and
 * has the specified key, HOST_NEW if the host is not known, and HOST_CHANGED
 * if the host is known but used to have a different host key.
 *
 * If no 'key' has been specified and a key of type 'keytype' is known
 * for the specified host, then HOST_FOUND is returned.
 */

static HostStatus
check_host_in_hostfile_by_key_or_type(const char *filename,
    const char *host, const Key *key, int keytype, Key *found, int *numret)
{
	FILE *f;
	char line[8192];
	int linenum = 0;
	u_int kbits;
	char *cp, *cp2, *hashed_host;
	HostStatus end_return;

	debug3("check_host_in_hostfile: filename %s", filename);

	/* Open the file containing the list of known hosts. */
	f = fopen(filename, "r");
	if (!f)
		return HOST_NEW;

	/*
	 * Return value when the loop terminates.  This is set to
	 * HOST_CHANGED if we have seen a different key for the host and have
	 * not found the proper one.
	 */
	end_return = HOST_NEW;

	/* Go through the file. */
	while (fgets(line, sizeof(line), f)) {
		cp = line;
		linenum++;

		/* Skip any leading whitespace, comments and empty lines. */
		for (; *cp == ' ' || *cp == '\t'; cp++)
			;
		if (!*cp || *cp == '#' || *cp == '\n')
			continue;

		/* Find the end of the host name portion. */
		for (cp2 = cp; *cp2 && *cp2 != ' ' && *cp2 != '\t'; cp2++)
			;

		/* Check if the host name matches. */
		if (match_hostname(host, cp, (u_int) (cp2 - cp)) != 1) {
			if (*cp != HASH_DELIM)
				continue;
			hashed_host = host_hash(host, cp, (u_int) (cp2 - cp));
			if (hashed_host == NULL) {
				debug("Invalid hashed host line %d of %s",
				    linenum, filename);
				continue;
			}
			if (strncmp(hashed_host, cp, (u_int) (cp2 - cp)) != 0)
				continue;
		}

		/* Got a match.  Skip host name. */
		cp = cp2;

		/*
		 * Extract the key from the line.  This will skip any leading
		 * whitespace.  Ignore badly formatted lines.
		 */
		if (!hostfile_read_key(&cp, &kbits, found))
			continue;

		if (numret != NULL)
			*numret = linenum;

		if (key == NULL) {
			/* we found a key of the requested type */
			if (found->type == keytype)
				return HOST_FOUND;
			continue;
		}

		if (!hostfile_check_key(kbits, found, host, filename, linenum))
			continue;

		/* Check if the current key is the same as the given key. */
		if (key_equal(key, found)) {
			/* Ok, they match. */
			debug3("check_host_in_hostfile: match line %d", linenum);
			fclose(f);
			return HOST_OK;
		}
		/*
		 * They do not match.  We will continue to go through the
		 * file; however, we note that we will not return that it is
		 * new.
		 */
		end_return = HOST_CHANGED;
	}
	/* Clear variables and close the file. */
	fclose(f);

	/*
	 * Return either HOST_NEW or HOST_CHANGED, depending on whether we
	 * saw a different key for the host.
	 */
	return end_return;
}

HostStatus
check_host_in_hostfile(const char *filename, const char *host, const Key *key,
    Key *found, int *numret)
{
	if (key == NULL)
		fatal("no key to look up");
	return (check_host_in_hostfile_by_key_or_type(filename, host, key, 0,
	    found, numret));
}

int
lookup_key_in_hostfile_by_type(const char *filename, const char *host,
    int keytype, Key *found, int *numret)
{
	return (check_host_in_hostfile_by_key_or_type(filename, host, NULL,
	    keytype, found, numret) == HOST_FOUND);
}

/*
 * Appends an entry to the host file.  Returns false if the entry could not
 * be appended.
 */

int
add_host_to_hostfile(const char *filename, const char *host, const Key *key,
    int store_hash)
{
	FILE *f;
	int success = 0;
	char *hashed_host = NULL;

	if (key == NULL)
		return 1;	/* XXX ? */
	f = fopen(filename, "a");
	if (!f)
		return 0;

	if (store_hash) {
		if ((hashed_host = host_hash(host, NULL, 0)) == NULL) {
			error("add_host_to_hostfile: host_hash failed");
			fclose(f);
			return 0;
		}
	}
	fprintf(f, "%s ", store_hash ? hashed_host : host);

	if (key_write(key, f)) {
		success = 1;
	} else {
		error("add_host_to_hostfile: saving key in %s failed", filename);
	}
	fprintf(f, "\n");
	fclose(f);
	return success;
}
Commit	Line	Data
8efc0c15	1	/*
5260325f	2	* Author: Tatu Ylonen <ylo@cs.hut.fi>
5260325f	3	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5260325f	4	* All rights reserved
bcbf86ec	5	* Functions for manipulating the known hosts files.
6ae2364d	6	*
bcbf86ec	7	* As far as I am concerned, the code I have written for this software
	8	* can be used freely for any purpose. Any derived versions of this
	9	* software must be clearly marked as such, and if the derived work is
	10	* incompatible with the protocol description in the RFC file, it must be
	11	* called by a name other than "ssh" or "Secure Shell".
6ae2364d	12	*
6ae2364d	13	*
a96070d4	14	* Copyright (c) 1999, 2000 Markus Friedl. All rights reserved.
bcbf86ec	15	* Copyright (c) 1999 Niels Provos. All rights reserved.
	16	*
	17	* Redistribution and use in source and binary forms, with or without
	18	* modification, are permitted provided that the following conditions
	19	* are met:
	20	* 1. Redistributions of source code must retain the above copyright
	21	* notice, this list of conditions and the following disclaimer.
	22	* 2. Redistributions in binary form must reproduce the above copyright
	23	* notice, this list of conditions and the following disclaimer in the
	24	* documentation and/or other materials provided with the distribution.
	25	*
	26	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	27	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	28	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	29	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	30	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	31	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	32	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	33	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	34	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	35	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
5260325f	36	*/
8efc0c15	37
8efc0c15	38	#include "includes.h"
5c63c2ab	39
5c63c2ab	40	#include <resolv.h>
cc63c340	41
5c63c2ab	42	#include <openssl/hmac.h>
5c63c2ab	43	#include <openssl/sha.h>
4fe2af09	44
4fe2af09	45	#include "match.h"
4fe2af09	46	#include "key.h"
4fe2af09	47	#include "hostfile.h"
42f11eb2	48	#include "log.h"
5c63c2ab	49	#include "xmalloc.h"
	50
	51	static int
	52	extract_salt(const char s, u_int l, char salt, size_t salt_len)
	53	{
	54	char p, b64salt;
	55	u_int b64len;
	56	int ret;
	57
	58	if (l < sizeof(HASH_MAGIC) - 1) {
	59	debug2("extract_salt: string too short");
	60	return (-1);
	61	}
	62	if (strncmp(s, HASH_MAGIC, sizeof(HASH_MAGIC) - 1) != 0) {
	63	debug2("extract_salt: invalid magic identifier");
	64	return (-1);
	65	}
	66	s += sizeof(HASH_MAGIC) - 1;
	67	l -= sizeof(HASH_MAGIC) - 1;
	68	if ((p = memchr(s, HASH_DELIM, l)) == NULL) {
	69	debug2("extract_salt: missing salt termination character");
	70	return (-1);
	71	}
	72
	73	b64len = p - s;
	74	/* Sanity check */
	75	if (b64len == 0 \|\| b64len > 1024) {
	76	debug2("extract_salt: bad encoded salt length %u", b64len);
	77	return (-1);
	78	}
	79	b64salt = xmalloc(1 + b64len);
	80	memcpy(b64salt, s, b64len);
	81	b64salt[b64len] = '\0';
	82
	83	ret = __b64_pton(b64salt, salt, salt_len);
	84	xfree(b64salt);
	85	if (ret == -1) {
	86	debug2("extract_salt: salt decode error");
	87	return (-1);
	88	}
	89	if (ret != SHA_DIGEST_LENGTH) {
18f8ef7a	90	debug2("extract_salt: expected salt len %d, got %d",
18f8ef7a	91	SHA_DIGEST_LENGTH, ret);
5c63c2ab	92	return (-1);
5c63c2ab	93	}
f8cc7664	94
5c63c2ab	95	return (0);
	96	}
	97
	98	char *
	99	host_hash(const char host, const char name_from_hostfile, u_int src_len)
	100	{
	101	const EVP_MD *md = EVP_sha1();
	102	HMAC_CTX mac_ctx;
	103	char salt[256], result[256], uu_salt[512], uu_result[512];
	104	static char encoded[1024];
	105	u_int i, len;
	106
	107	len = EVP_MD_size(md);
	108
	109	if (name_from_hostfile == NULL) {
	110	/* Create new salt */
	111	for (i = 0; i < len; i++)
	112	salt[i] = arc4random();
	113	} else {
	114	/* Extract salt from known host entry */
	115	if (extract_salt(name_from_hostfile, src_len, salt,
	116	sizeof(salt)) == -1)
	117	return (NULL);
	118	}
	119
	120	HMAC_Init(&mac_ctx, salt, len, md);
	121	HMAC_Update(&mac_ctx, host, strlen(host));
	122	HMAC_Final(&mac_ctx, result, NULL);
	123	HMAC_cleanup(&mac_ctx);
	124
f8cc7664	125	if (__b64_ntop(salt, len, uu_salt, sizeof(uu_salt)) == -1 \|\|
5c63c2ab	126	__b64_ntop(result, len, uu_result, sizeof(uu_result)) == -1)
	127	fatal("host_hash: __b64_ntop failed");
	128
	129	snprintf(encoded, sizeof(encoded), "%s%s%c%s", HASH_MAGIC, uu_salt,
	130	HASH_DELIM, uu_result);
	131
	132	return (encoded);
	133	}
8efc0c15	134
aa3378df	135	/*
4fe2af09	136	* Parses an RSA (number of bits, e, n) or DSA key from a string. Moves the
4fe2af09	137	* pointer over the key. Skips any whitespace at the beginning and at end.
aa3378df	138	*/
8efc0c15	139
fb396518	140	int
1e3b8b07	141	hostfile_read_key(char *cpp, u_int bitsp, Key *ret)
8efc0c15	142	{
5260325f	143	char *cp;
	144
	145	/* Skip leading whitespace. */
aa3378df	146	for (cp = cpp; cp == ' ' \|\| *cp == '\t'; cp++)
aa3378df	147	;
5260325f	148
fa08c86b	149	if (key_read(ret, &cp) != 1)
5260325f	150	return 0;
	151
	152	/* Skip trailing whitespace. */
aa3378df	153	for (; cp == ' ' \|\| cp == '\t'; cp++)
aa3378df	154	;
5260325f	155
	156	/* Return results. */
	157	*cpp = cp;
fa08c86b	158	*bitsp = key_size(ret);
5260325f	159	return 1;
8efc0c15	160	}
8efc0c15	161
396c147e	162	static int
b6c7b7b7	163	hostfile_check_key(int bits, const Key key, const char host, const char *filename, int linenum)
4fe2af09	164	{
fa08c86b	165	if (key == NULL \|\| key->type != KEY_RSA1 \|\| key->rsa == NULL)
4fe2af09	166	return 1;
4fe2af09	167	if (bits != BN_num_bits(key->rsa->n)) {
bbe88b6d	168	logit("Warning: %s, line %d: keysize mismatch for host %s: "
4fe2af09	169	"actual %d vs. announced %d.",
4fe2af09	170	filename, linenum, host, BN_num_bits(key->rsa->n), bits);
bbe88b6d	171	logit("Warning: replace %d with %d in %s, line %d.",
4fe2af09	172	bits, BN_num_bits(key->rsa->n), filename, linenum);
8efc0c15	173	}
4fe2af09	174	return 1;
8efc0c15	175	}
8efc0c15	176
aa3378df	177	/*
	178	* Checks whether the given host (which must be in all lowercase) is already
	179	* in the list of our known hosts. Returns HOST_OK if the host is known and
	180	* has the specified key, HOST_NEW if the host is not known, and HOST_CHANGED
	181	* if the host is known but used to have a different host key.
8a48a7ef	182	*
	183	* If no 'key' has been specified and a key of type 'keytype' is known
	184	* for the specified host, then HOST_FOUND is returned.
aa3378df	185	*/
8efc0c15	186
8a48a7ef	187	static HostStatus
8a48a7ef	188	check_host_in_hostfile_by_key_or_type(const char *filename,
b6c7b7b7	189	const char host, const Key key, int keytype, Key found, int numret)
8efc0c15	190	{
5260325f	191	FILE *f;
	192	char line[8192];
	193	int linenum = 0;
d9d49fdb	194	u_int kbits;
5c63c2ab	195	char cp, cp2, *hashed_host;
5260325f	196	HostStatus end_return;
5260325f	197
8002af61	198	debug3("check_host_in_hostfile: filename %s", filename);
8a48a7ef	199
5260325f	200	/* Open the file containing the list of known hosts. */
	201	f = fopen(filename, "r");
	202	if (!f)
	203	return HOST_NEW;
	204
aa3378df	205	/*
	206	* Return value when the loop terminates. This is set to
	207	* HOST_CHANGED if we have seen a different key for the host and have
	208	* not found the proper one.
	209	*/
5260325f	210	end_return = HOST_NEW;
5260325f	211
d9d49fdb	212	/* Go through the file. */
5260325f	213	while (fgets(line, sizeof(line), f)) {
	214	cp = line;
	215	linenum++;
	216
aa3378df	217	/* Skip any leading whitespace, comments and empty lines. */
	218	for (; cp == ' ' \|\| cp == '\t'; cp++)
	219	;
5260325f	220	if (!cp \|\| cp == '#' \|\| *cp == '\n')
	221	continue;
	222
	223	/* Find the end of the host name portion. */
aa3378df	224	for (cp2 = cp; cp2 && cp2 != ' ' && *cp2 != '\t'; cp2++)
aa3378df	225	;
5260325f	226
5260325f	227	/* Check if the host name matches. */
5c63c2ab	228	if (match_hostname(host, cp, (u_int) (cp2 - cp)) != 1) {
	229	if (*cp != HASH_DELIM)
	230	continue;
	231	hashed_host = host_hash(host, cp, (u_int) (cp2 - cp));
	232	if (hashed_host == NULL) {
	233	debug("Invalid hashed host line %d of %s",
	234	linenum, filename);
	235	continue;
	236	}
	237	if (strncmp(hashed_host, cp, (u_int) (cp2 - cp)) != 0)
	238	continue;
	239	}
5260325f	240
	241	/* Got a match. Skip host name. */
	242	cp = cp2;
	243
aa3378df	244	/*
	245	* Extract the key from the line. This will skip any leading
	246	* whitespace. Ignore badly formatted lines.
	247	*/
4fe2af09	248	if (!hostfile_read_key(&cp, &kbits, found))
4fe2af09	249	continue;
5260325f	250
1e3b8b07	251	if (numret != NULL)
	252	*numret = linenum;
	253
8a48a7ef	254	if (key == NULL) {
	255	/* we found a key of the requested type */
	256	if (found->type == keytype)
	257	return HOST_FOUND;
	258	continue;
	259	}
	260
	261	if (!hostfile_check_key(kbits, found, host, filename, linenum))
	262	continue;
	263
5260325f	264	/* Check if the current key is the same as the given key. */
4fe2af09	265	if (key_equal(key, found)) {
5260325f	266	/* Ok, they match. */
8002af61	267	debug3("check_host_in_hostfile: match line %d", linenum);
5260325f	268	fclose(f);
	269	return HOST_OK;
	270	}
aa3378df	271	/*
	272	* They do not match. We will continue to go through the
	273	* file; however, we note that we will not return that it is
	274	* new.
	275	*/
5260325f	276	end_return = HOST_CHANGED;
8efc0c15	277	}
5260325f	278	/* Clear variables and close the file. */
	279	fclose(f);
	280
aa3378df	281	/*
	282	* Return either HOST_NEW or HOST_CHANGED, depending on whether we
	283	* saw a different key for the host.
	284	*/
5260325f	285	return end_return;
8efc0c15	286	}
8efc0c15	287
8a48a7ef	288	HostStatus
b6c7b7b7	289	check_host_in_hostfile(const char filename, const char host, const Key *key,
8a48a7ef	290	Key found, int numret)
	291	{
	292	if (key == NULL)
	293	fatal("no key to look up");
	294	return (check_host_in_hostfile_by_key_or_type(filename, host, key, 0,
	295	found, numret));
	296	}
	297
	298	int
	299	lookup_key_in_hostfile_by_type(const char filename, const char host,
	300	int keytype, Key found, int numret)
	301	{
	302	return (check_host_in_hostfile_by_key_or_type(filename, host, NULL,
	303	keytype, found, numret) == HOST_FOUND);
	304	}
	305
aa3378df	306	/*
	307	* Appends an entry to the host file. Returns false if the entry could not
	308	* be appended.
	309	*/
8efc0c15	310
8efc0c15	311	int
f8cc7664	312	add_host_to_hostfile(const char filename, const char host, const Key *key,
5c63c2ab	313	int store_hash)
8efc0c15	314	{
5260325f	315	FILE *f;
4fe2af09	316	int success = 0;
a056dfa2	317	char *hashed_host = NULL;
5c63c2ab	318
4fe2af09	319	if (key == NULL)
a306f2dd	320	return 1; /* XXX ? */
5260325f	321	f = fopen(filename, "a");
	322	if (!f)
	323	return 0;
5c63c2ab	324
	325	if (store_hash) {
	326	if ((hashed_host = host_hash(host, NULL, 0)) == NULL) {
	327	error("add_host_to_hostfile: host_hash failed");
	328	fclose(f);
	329	return 0;
	330	}
	331	}
	332	fprintf(f, "%s ", store_hash ? hashed_host : host);
	333
4fe2af09	334	if (key_write(key, f)) {
4fe2af09	335	success = 1;
4fe2af09	336	} else {
a306f2dd	337	error("add_host_to_hostfile: saving key in %s failed", filename);
5260325f	338	}
a306f2dd	339	fprintf(f, "\n");
5260325f	340	fclose(f);
4fe2af09	341	return success;
8efc0c15	342	}