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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/ssh/lib/../dns.c	Lines:	0	141	0.0 %
Date:	2017-11-13	Branches:	0	79	0.0 %


/* $OpenBSD: dns.c,v 1.37 2017/09/14 04:32:21 djm Exp $ */

/*
 * Copyright (c) 2003 Wesley Griffin. All rights reserved.
 * Copyright (c) 2003 Jakob Schlyter. 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 <sys/socket.h>

#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>

#include "xmalloc.h"
#include "sshkey.h"
#include "ssherr.h"
#include "dns.h"
#include "log.h"
#include "digest.h"

static const char *errset_text[] = {
	"success",		/* 0 ERRSET_SUCCESS */
	"out of memory",	/* 1 ERRSET_NOMEMORY */
	"general failure",	/* 2 ERRSET_FAIL */
	"invalid parameter",	/* 3 ERRSET_INVAL */
	"name does not exist",	/* 4 ERRSET_NONAME */
	"data does not exist",	/* 5 ERRSET_NODATA */
};

static const char *
dns_result_totext(unsigned int res)
{
	switch (res) {
	case ERRSET_SUCCESS:
		return errset_text[ERRSET_SUCCESS];
	case ERRSET_NOMEMORY:
		return errset_text[ERRSET_NOMEMORY];
	case ERRSET_FAIL:
		return errset_text[ERRSET_FAIL];
	case ERRSET_INVAL:
		return errset_text[ERRSET_INVAL];
	case ERRSET_NONAME:
		return errset_text[ERRSET_NONAME];
	case ERRSET_NODATA:
		return errset_text[ERRSET_NODATA];
	default:
		return "unknown error";
	}
}

/*
 * Read SSHFP parameters from key buffer.
 */
static int
dns_read_key(u_int8_t *algorithm, u_int8_t *digest_type,
    u_char **digest, size_t *digest_len, struct sshkey *key)
{
	int r, success = 0;
	int fp_alg = -1;

	switch (key->type) {
	case KEY_RSA:
		*algorithm = SSHFP_KEY_RSA;
		if (!*digest_type)
			*digest_type = SSHFP_HASH_SHA1;
		break;
	case KEY_DSA:
		*algorithm = SSHFP_KEY_DSA;
		if (!*digest_type)
			*digest_type = SSHFP_HASH_SHA1;
		break;
	case KEY_ECDSA:
		*algorithm = SSHFP_KEY_ECDSA;
		if (!*digest_type)
			*digest_type = SSHFP_HASH_SHA256;
		break;
	case KEY_ED25519:
		*algorithm = SSHFP_KEY_ED25519;
		if (!*digest_type)
			*digest_type = SSHFP_HASH_SHA256;
		break;
	default:
		*algorithm = SSHFP_KEY_RESERVED; /* 0 */
		*digest_type = SSHFP_HASH_RESERVED; /* 0 */
	}

	switch (*digest_type) {
	case SSHFP_HASH_SHA1:
		fp_alg = SSH_DIGEST_SHA1;
		break;
	case SSHFP_HASH_SHA256:
		fp_alg = SSH_DIGEST_SHA256;
		break;
	default:
		*digest_type = SSHFP_HASH_RESERVED; /* 0 */
	}

	if (*algorithm && *digest_type) {
		if ((r = sshkey_fingerprint_raw(key, fp_alg, digest,
		    digest_len)) != 0)
			fatal("%s: sshkey_fingerprint_raw: %s", __func__,
			   ssh_err(r));
		success = 1;
	} else {
		*digest = NULL;
		*digest_len = 0;
		success = 0;
	}

	return success;
}

/*
 * Read SSHFP parameters from rdata buffer.
 */
static int
dns_read_rdata(u_int8_t *algorithm, u_int8_t *digest_type,
    u_char **digest, size_t *digest_len, u_char *rdata, int rdata_len)
{
	int success = 0;

	*algorithm = SSHFP_KEY_RESERVED;
	*digest_type = SSHFP_HASH_RESERVED;

	if (rdata_len >= 2) {
		*algorithm = rdata[0];
		*digest_type = rdata[1];
		*digest_len = rdata_len - 2;

		if (*digest_len > 0) {
			*digest = xmalloc(*digest_len);
			memcpy(*digest, rdata + 2, *digest_len);
		} else {
			*digest = (u_char *)xstrdup("");
		}

		success = 1;
	}

	return success;
}

/*
 * Check if hostname is numerical.
 * Returns -1 if hostname is numeric, 0 otherwise
 */
static int
is_numeric_hostname(const char *hostname)
{
	struct addrinfo hints, *ai;

	/*
	 * We shouldn't ever get a null host but if we do then log an error
	 * and return -1 which stops DNS key fingerprint processing.
	 */
	if (hostname == NULL) {
		error("is_numeric_hostname called with NULL hostname");
		return -1;
	}

	memset(&hints, 0, sizeof(hints));
	hints.ai_socktype = SOCK_DGRAM;
	hints.ai_flags = AI_NUMERICHOST;

	if (getaddrinfo(hostname, NULL, &hints, &ai) == 0) {
		freeaddrinfo(ai);
		return -1;
	}

	return 0;
}

/*
 * Verify the given hostname, address and host key using DNS.
 * Returns 0 if lookup succeeds, -1 otherwise
 */
int
verify_host_key_dns(const char *hostname, struct sockaddr *address,
    struct sshkey *hostkey, int *flags)
{
	u_int counter;
	int result;
	struct rrsetinfo *fingerprints = NULL;

	u_int8_t hostkey_algorithm;
	u_int8_t hostkey_digest_type = SSHFP_HASH_RESERVED;
	u_char *hostkey_digest;
	size_t hostkey_digest_len;

	u_int8_t dnskey_algorithm;
	u_int8_t dnskey_digest_type;
	u_char *dnskey_digest;
	size_t dnskey_digest_len;

	*flags = 0;

	debug3("verify_host_key_dns");
	if (hostkey == NULL)
		fatal("No key to look up!");

	if (is_numeric_hostname(hostname)) {
		debug("skipped DNS lookup for numerical hostname");
		return -1;
	}

	result = getrrsetbyname(hostname, DNS_RDATACLASS_IN,
	    DNS_RDATATYPE_SSHFP, 0, &fingerprints);
	if (result) {
		verbose("DNS lookup error: %s", dns_result_totext(result));
		return -1;
	}

	if (fingerprints->rri_flags & RRSET_VALIDATED) {
		*flags |= DNS_VERIFY_SECURE;
		debug("found %d secure fingerprints in DNS",
		    fingerprints->rri_nrdatas);
	} else {
		debug("found %d insecure fingerprints in DNS",
		    fingerprints->rri_nrdatas);
	}

	/* Initialize default host key parameters */
	if (!dns_read_key(&hostkey_algorithm, &hostkey_digest_type,
	    &hostkey_digest, &hostkey_digest_len, hostkey)) {
		error("Error calculating host key fingerprint.");
		freerrset(fingerprints);
		return -1;
	}

	if (fingerprints->rri_nrdatas)
		*flags |= DNS_VERIFY_FOUND;

	for (counter = 0; counter < fingerprints->rri_nrdatas; counter++) {
		/*
		 * Extract the key from the answer. Ignore any badly
		 * formatted fingerprints.
		 */
		if (!dns_read_rdata(&dnskey_algorithm, &dnskey_digest_type,
		    &dnskey_digest, &dnskey_digest_len,
		    fingerprints->rri_rdatas[counter].rdi_data,
		    fingerprints->rri_rdatas[counter].rdi_length)) {
			verbose("Error parsing fingerprint from DNS.");
			continue;
		}

		if (hostkey_digest_type != dnskey_digest_type) {
			hostkey_digest_type = dnskey_digest_type;
			free(hostkey_digest);

			/* Initialize host key parameters */
			if (!dns_read_key(&hostkey_algorithm,
			    &hostkey_digest_type, &hostkey_digest,
			    &hostkey_digest_len, hostkey)) {
				error("Error calculating key fingerprint.");
				freerrset(fingerprints);
				return -1;
			}
		}

		/* Check if the current key is the same as the given key */
		if (hostkey_algorithm == dnskey_algorithm &&
		    hostkey_digest_type == dnskey_digest_type) {
			if (hostkey_digest_len == dnskey_digest_len &&
			    timingsafe_bcmp(hostkey_digest, dnskey_digest,
			    hostkey_digest_len) == 0)
				*flags |= DNS_VERIFY_MATCH;
		}
		free(dnskey_digest);
	}

	free(hostkey_digest); /* from sshkey_fingerprint_raw() */
	freerrset(fingerprints);

	if (*flags & DNS_VERIFY_FOUND)
		if (*flags & DNS_VERIFY_MATCH)
			debug("matching host key fingerprint found in DNS");
		else
			debug("mismatching host key fingerprint found in DNS");
	else
		debug("no host key fingerprint found in DNS");

	return 0;
}

/*
 * Export the fingerprint of a key as a DNS resource record
 */
int
export_dns_rr(const char *hostname, struct sshkey *key, FILE *f, int generic)
{
	u_int8_t rdata_pubkey_algorithm = 0;
	u_int8_t rdata_digest_type = SSHFP_HASH_RESERVED;
	u_int8_t dtype;
	u_char *rdata_digest;
	size_t i, rdata_digest_len;
	int success = 0;

	for (dtype = SSHFP_HASH_SHA1; dtype < SSHFP_HASH_MAX; dtype++) {
		rdata_digest_type = dtype;
		if (dns_read_key(&rdata_pubkey_algorithm, &rdata_digest_type,
		    &rdata_digest, &rdata_digest_len, key)) {
			if (generic) {
				fprintf(f, "%s IN TYPE%d \\# %zu %02x %02x ",
				    hostname, DNS_RDATATYPE_SSHFP,
				    2 + rdata_digest_len,
				    rdata_pubkey_algorithm, rdata_digest_type);
			} else {
				fprintf(f, "%s IN SSHFP %d %d ", hostname,
				    rdata_pubkey_algorithm, rdata_digest_type);
			}
			for (i = 0; i < rdata_digest_len; i++)
				fprintf(f, "%02x", rdata_digest[i]);
			fprintf(f, "\n");
			free(rdata_digest); /* from sshkey_fingerprint_raw() */
			success = 1;
		}
	}

	/* No SSHFP record was generated at all */
	if (success == 0) {
		error("%s: unsupported algorithm and/or digest_type", __func__);
	}

	return success;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: dns.c,v 1.37 2017/09/14 04:32:21 djm Exp $ */
2
3			/*
4			* Copyright (c) 2003 Wesley Griffin. All rights reserved.
5			* Copyright (c) 2003 Jakob Schlyter. All rights reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without
8			* modification, are permitted provided that the following conditions
9			* are met:
10			* 1. Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in the
14			* documentation and/or other materials provided with the distribution.
15			*
16			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26			*/
27
28			#include <sys/types.h>
29			#include <sys/socket.h>
30
31			#include <netdb.h>
32			#include <stdio.h>
33			#include <string.h>
34			#include <stdarg.h>
35			#include <stdlib.h>
36
37			#include "xmalloc.h"
38			#include "sshkey.h"
39			#include "ssherr.h"
40			#include "dns.h"
41			#include "log.h"
42			#include "digest.h"
43
44			static const char *errset_text[] = {
45			"success", /* 0 ERRSET_SUCCESS */
46			"out of memory", /* 1 ERRSET_NOMEMORY */
47			"general failure", /* 2 ERRSET_FAIL */
48			"invalid parameter", /* 3 ERRSET_INVAL */
49			"name does not exist", /* 4 ERRSET_NONAME */
50			"data does not exist", /* 5 ERRSET_NODATA */
51			};
52
53			static const char *
54			dns_result_totext(unsigned int res)
55			{
56			switch (res) {
57			case ERRSET_SUCCESS:
58			return errset_text[ERRSET_SUCCESS];
59			case ERRSET_NOMEMORY:
60			return errset_text[ERRSET_NOMEMORY];
61			case ERRSET_FAIL:
62			return errset_text[ERRSET_FAIL];
63			case ERRSET_INVAL:
64			return errset_text[ERRSET_INVAL];
65			case ERRSET_NONAME:
66			return errset_text[ERRSET_NONAME];
67			case ERRSET_NODATA:
68			return errset_text[ERRSET_NODATA];
69			default:
70			return "unknown error";
71			}
72			}
73
74			/*
75			* Read SSHFP parameters from key buffer.
76			*/
77			static int
78			dns_read_key(u_int8_t algorithm, u_int8_t digest_type,
79			u_char *digest, size_t digest_len, struct sshkey *key)
80			{
81			int r, success = 0;
82			int fp_alg = -1;
83
84			switch (key->type) {
85			case KEY_RSA:
86			*algorithm = SSHFP_KEY_RSA;
87			if (!*digest_type)
88			*digest_type = SSHFP_HASH_SHA1;
89			break;
90			case KEY_DSA:
91			*algorithm = SSHFP_KEY_DSA;
92			if (!*digest_type)
93			*digest_type = SSHFP_HASH_SHA1;
94			break;
95			case KEY_ECDSA:
96			*algorithm = SSHFP_KEY_ECDSA;
97			if (!*digest_type)
98			*digest_type = SSHFP_HASH_SHA256;
99			break;
100			case KEY_ED25519:
101			*algorithm = SSHFP_KEY_ED25519;
102			if (!*digest_type)
103			*digest_type = SSHFP_HASH_SHA256;
104			break;
105			default:
106			algorithm = SSHFP_KEY_RESERVED; / 0 */
107			digest_type = SSHFP_HASH_RESERVED; / 0 */
108			}
109
110			switch (*digest_type) {
111			case SSHFP_HASH_SHA1:
112			fp_alg = SSH_DIGEST_SHA1;
113			break;
114			case SSHFP_HASH_SHA256:
115			fp_alg = SSH_DIGEST_SHA256;
116			break;
117			default:
118			digest_type = SSHFP_HASH_RESERVED; / 0 */
119			}
120
121			if (algorithm && digest_type) {
122			if ((r = sshkey_fingerprint_raw(key, fp_alg, digest,
123			digest_len)) != 0)
124			fatal("%s: sshkey_fingerprint_raw: %s", __func__,
125			ssh_err(r));
126			success = 1;
127			} else {
128			*digest = NULL;
129			*digest_len = 0;
130			success = 0;
131			}
132
133			return success;
134			}
135
136			/*
137			* Read SSHFP parameters from rdata buffer.
138			*/
139			static int
140			dns_read_rdata(u_int8_t algorithm, u_int8_t digest_type,
141			u_char *digest, size_t digest_len, u_char *rdata, int rdata_len)
142			{
143			int success = 0;
144
145			*algorithm = SSHFP_KEY_RESERVED;
146			*digest_type = SSHFP_HASH_RESERVED;
147
148			if (rdata_len >= 2) {
149			*algorithm = rdata[0];
150			*digest_type = rdata[1];
151			*digest_len = rdata_len - 2;
152
153			if (*digest_len > 0) {
154			digest = xmalloc(digest_len);
155			memcpy(digest, rdata + 2, digest_len);
156			} else {
157			digest = (u_char )xstrdup("");
158			}
159
160			success = 1;
161			}
162
163			return success;
164			}
165
166			/*
167			* Check if hostname is numerical.
168			* Returns -1 if hostname is numeric, 0 otherwise
169			*/
170			static int
171			is_numeric_hostname(const char *hostname)
172			{
173			struct addrinfo hints, *ai;
174
175			/*
176			* We shouldn't ever get a null host but if we do then log an error
177			* and return -1 which stops DNS key fingerprint processing.
178			*/
179			if (hostname == NULL) {
180			error("is_numeric_hostname called with NULL hostname");
181			return -1;
182			}
183
184			memset(&hints, 0, sizeof(hints));
185			hints.ai_socktype = SOCK_DGRAM;
186			hints.ai_flags = AI_NUMERICHOST;
187
188			if (getaddrinfo(hostname, NULL, &hints, &ai) == 0) {
189			freeaddrinfo(ai);
190			return -1;
191			}
192
193			return 0;
194			}
195
196			/*
197			* Verify the given hostname, address and host key using DNS.
198			* Returns 0 if lookup succeeds, -1 otherwise
199			*/
200			int
201			verify_host_key_dns(const char hostname, struct sockaddr address,
202			struct sshkey hostkey, int flags)
203			{
204			u_int counter;
205			int result;
206			struct rrsetinfo *fingerprints = NULL;
207
208			u_int8_t hostkey_algorithm;
209			u_int8_t hostkey_digest_type = SSHFP_HASH_RESERVED;
210			u_char *hostkey_digest;
211			size_t hostkey_digest_len;
212
213			u_int8_t dnskey_algorithm;
214			u_int8_t dnskey_digest_type;
215			u_char *dnskey_digest;
216			size_t dnskey_digest_len;
217
218			*flags = 0;
219
220			debug3("verify_host_key_dns");
221			if (hostkey == NULL)
222			fatal("No key to look up!");
223
224			if (is_numeric_hostname(hostname)) {
225			debug("skipped DNS lookup for numerical hostname");
226			return -1;
227			}
228
229			result = getrrsetbyname(hostname, DNS_RDATACLASS_IN,
230			DNS_RDATATYPE_SSHFP, 0, &fingerprints);
231			if (result) {
232			verbose("DNS lookup error: %s", dns_result_totext(result));
233			return -1;
234			}
235
236			if (fingerprints->rri_flags & RRSET_VALIDATED) {
237			*flags \|= DNS_VERIFY_SECURE;
238			debug("found %d secure fingerprints in DNS",
239			fingerprints->rri_nrdatas);
240			} else {
241			debug("found %d insecure fingerprints in DNS",
242			fingerprints->rri_nrdatas);
243			}
244
245			/* Initialize default host key parameters */
246			if (!dns_read_key(&hostkey_algorithm, &hostkey_digest_type,
247			&hostkey_digest, &hostkey_digest_len, hostkey)) {
248			error("Error calculating host key fingerprint.");
249			freerrset(fingerprints);
250			return -1;
251			}
252
253			if (fingerprints->rri_nrdatas)
254			*flags \|= DNS_VERIFY_FOUND;
255
256			for (counter = 0; counter < fingerprints->rri_nrdatas; counter++) {
257			/*
258			* Extract the key from the answer. Ignore any badly
259			* formatted fingerprints.
260			*/
261			if (!dns_read_rdata(&dnskey_algorithm, &dnskey_digest_type,
262			&dnskey_digest, &dnskey_digest_len,
263			fingerprints->rri_rdatas[counter].rdi_data,
264			fingerprints->rri_rdatas[counter].rdi_length)) {
265			verbose("Error parsing fingerprint from DNS.");
266			continue;
267			}
268
269			if (hostkey_digest_type != dnskey_digest_type) {
270			hostkey_digest_type = dnskey_digest_type;
271			free(hostkey_digest);
272
273			/* Initialize host key parameters */
274			if (!dns_read_key(&hostkey_algorithm,
275			&hostkey_digest_type, &hostkey_digest,
276			&hostkey_digest_len, hostkey)) {
277			error("Error calculating key fingerprint.");
278			freerrset(fingerprints);
279			return -1;
280			}
281			}
282
283			/* Check if the current key is the same as the given key */
284			if (hostkey_algorithm == dnskey_algorithm &&
285			hostkey_digest_type == dnskey_digest_type) {
286			if (hostkey_digest_len == dnskey_digest_len &&
287			timingsafe_bcmp(hostkey_digest, dnskey_digest,
288			hostkey_digest_len) == 0)
289			*flags \|= DNS_VERIFY_MATCH;
290			}
291			free(dnskey_digest);
292			}
293
294			free(hostkey_digest); /* from sshkey_fingerprint_raw() */
295			freerrset(fingerprints);
296
297			if (*flags & DNS_VERIFY_FOUND)
298			if (*flags & DNS_VERIFY_MATCH)
299			debug("matching host key fingerprint found in DNS");
300			else
301			debug("mismatching host key fingerprint found in DNS");
302			else
303			debug("no host key fingerprint found in DNS");
304
305			return 0;
306			}
307
308			/*
309			* Export the fingerprint of a key as a DNS resource record
310			*/
311			int
312			export_dns_rr(const char hostname, struct sshkey key, FILE *f, int generic)
313			{
314			u_int8_t rdata_pubkey_algorithm = 0;
315			u_int8_t rdata_digest_type = SSHFP_HASH_RESERVED;
316			u_int8_t dtype;
317			u_char *rdata_digest;
318			size_t i, rdata_digest_len;
319			int success = 0;
320
321			for (dtype = SSHFP_HASH_SHA1; dtype < SSHFP_HASH_MAX; dtype++) {
322			rdata_digest_type = dtype;
323			if (dns_read_key(&rdata_pubkey_algorithm, &rdata_digest_type,
324			&rdata_digest, &rdata_digest_len, key)) {
325			if (generic) {
326			fprintf(f, "%s IN TYPE%d \\# %zu %02x %02x ",
327			hostname, DNS_RDATATYPE_SSHFP,
328			2 + rdata_digest_len,
329			rdata_pubkey_algorithm, rdata_digest_type);
330			} else {
331			fprintf(f, "%s IN SSHFP %d %d ", hostname,
332			rdata_pubkey_algorithm, rdata_digest_type);
333			}
334			for (i = 0; i < rdata_digest_len; i++)
335			fprintf(f, "%02x", rdata_digest[i]);
336			fprintf(f, "\n");
337			free(rdata_digest); /* from sshkey_fingerprint_raw() */
338			success = 1;
339			}
340			}
341
342			/* No SSHFP record was generated at all */
343			if (success == 0) {
344			error("%s: unsupported algorithm and/or digest_type", __func__);
345			}
346
347			return success;
348			}