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openssh/auth-options.c

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/* $OpenBSD: auth-options.c,v 1.92 2020/03/06 18:15:38 markus Exp $ */
/*
* Copyright (c) 2018 Damien Miller <djm@mindrot.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#include <sys/types.h>
#include <stdlib.h>
#include <netdb.h>
#include <pwd.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <ctype.h>
#include <limits.h>
#include "openbsd-compat/sys-queue.h"
#include "xmalloc.h"
#include "ssherr.h"
#include "log.h"
#include "sshbuf.h"
#include "misc.h"
#include "sshkey.h"
#include "match.h"
#include "ssh2.h"
#include "auth-options.h"
static int
dup_strings(char ***dstp, size_t *ndstp, char **src, size_t nsrc)
{
char **dst;
size_t i, j;
*dstp = NULL;
*ndstp = 0;
if (nsrc == 0)
return 0;
if ((dst = calloc(nsrc, sizeof(*src))) == NULL)
return -1;
for (i = 0; i < nsrc; i++) {
if ((dst[i] = strdup(src[i])) == NULL) {
for (j = 0; j < i; j++)
free(dst[j]);
free(dst);
return -1;
}
}
/* success */
*dstp = dst;
*ndstp = nsrc;
return 0;
}
#define OPTIONS_CRITICAL 1
#define OPTIONS_EXTENSIONS 2
static int
cert_option_list(struct sshauthopt *opts, struct sshbuf *oblob,
u_int which, int crit)
{
char *command, *allowed;
char *name = NULL;
struct sshbuf *c = NULL, *data = NULL;
int r, ret = -1, found;
if ((c = sshbuf_fromb(oblob)) == NULL) {
error("%s: sshbuf_fromb failed", __func__);
goto out;
}
while (sshbuf_len(c) > 0) {
sshbuf_free(data);
data = NULL;
if ((r = sshbuf_get_cstring(c, &name, NULL)) != 0 ||
(r = sshbuf_froms(c, &data)) != 0) {
error("Unable to parse certificate options: %s",
ssh_err(r));
goto out;
}
debug3("found certificate option \"%.100s\" len %zu",
name, sshbuf_len(data));
found = 0;
if ((which & OPTIONS_EXTENSIONS) != 0) {
if (strcmp(name, "no-touch-required") == 0) {
opts->no_require_user_presence = 1;
found = 1;
} else if (strcmp(name, "permit-X11-forwarding") == 0) {
opts->permit_x11_forwarding_flag = 1;
found = 1;
} else if (strcmp(name,
"permit-agent-forwarding") == 0) {
opts->permit_agent_forwarding_flag = 1;
found = 1;
} else if (strcmp(name,
"permit-port-forwarding") == 0) {
opts->permit_port_forwarding_flag = 1;
found = 1;
} else if (strcmp(name, "permit-pty") == 0) {
opts->permit_pty_flag = 1;
found = 1;
} else if (strcmp(name, "permit-user-rc") == 0) {
opts->permit_user_rc = 1;
found = 1;
}
}
if (!found && (which & OPTIONS_CRITICAL) != 0) {
if (strcmp(name, "force-command") == 0) {
if ((r = sshbuf_get_cstring(data, &command,
NULL)) != 0) {
error("Unable to parse \"%s\" "
"section: %s", name, ssh_err(r));
goto out;
}
if (opts->force_command != NULL) {
error("Certificate has multiple "
"force-command options");
free(command);
goto out;
}
opts->force_command = command;
found = 1;
}
if (strcmp(name, "source-address") == 0) {
if ((r = sshbuf_get_cstring(data, &allowed,
NULL)) != 0) {
error("Unable to parse \"%s\" "
"section: %s", name, ssh_err(r));
goto out;
}
if (opts->required_from_host_cert != NULL) {
error("Certificate has multiple "
"source-address options");
free(allowed);
goto out;
}
/* Check syntax */
if (addr_match_cidr_list(NULL, allowed) == -1) {
error("Certificate source-address "
"contents invalid");
goto out;
}
opts->required_from_host_cert = allowed;
found = 1;
}
}
if (!found) {
if (crit) {
error("Certificate critical option \"%s\" "
"is not supported", name);
goto out;
} else {
logit("Certificate extension \"%s\" "
"is not supported", name);
}
} else if (sshbuf_len(data) != 0) {
error("Certificate option \"%s\" corrupt "
"(extra data)", name);
goto out;
}
free(name);
name = NULL;
}
/* successfully parsed all options */
ret = 0;
out:
free(name);
sshbuf_free(data);
sshbuf_free(c);
return ret;
}
struct sshauthopt *
sshauthopt_new(void)
{
struct sshauthopt *ret;
if ((ret = calloc(1, sizeof(*ret))) == NULL)
return NULL;
ret->force_tun_device = -1;
return ret;
}
void
sshauthopt_free(struct sshauthopt *opts)
{
size_t i;
if (opts == NULL)
return;
free(opts->cert_principals);
free(opts->force_command);
free(opts->required_from_host_cert);
free(opts->required_from_host_keys);
for (i = 0; i < opts->nenv; i++)
free(opts->env[i]);
free(opts->env);
for (i = 0; i < opts->npermitopen; i++)
free(opts->permitopen[i]);
free(opts->permitopen);
for (i = 0; i < opts->npermitlisten; i++)
free(opts->permitlisten[i]);
free(opts->permitlisten);
freezero(opts, sizeof(*opts));
}
struct sshauthopt *
sshauthopt_new_with_keys_defaults(void)
{
struct sshauthopt *ret = NULL;
if ((ret = sshauthopt_new()) == NULL)
return NULL;
/* Defaults for authorized_keys flags */
ret->permit_port_forwarding_flag = 1;
ret->permit_agent_forwarding_flag = 1;
ret->permit_x11_forwarding_flag = 1;
ret->permit_pty_flag = 1;
ret->permit_user_rc = 1;
return ret;
}
/*
* Parse and record a permitopen/permitlisten directive.
* Return 0 on success. Return -1 on failure and sets *errstrp to error reason.
*/
static int
handle_permit(const char **optsp, int allow_bare_port,
char ***permitsp, size_t *npermitsp, const char **errstrp)
{
char *opt, *tmp, *cp, *host, **permits = *permitsp;
size_t npermits = *npermitsp;
const char *errstr = "unknown error";
if (npermits > SSH_AUTHOPT_PERMIT_MAX) {
*errstrp = "too many permission directives";
return -1;
}
if ((opt = opt_dequote(optsp, &errstr)) == NULL) {
return -1;
}
if (allow_bare_port && strchr(opt, ':') == NULL) {
/*
* Allow a bare port number in permitlisten to indicate a
* listen_host wildcard.
*/
if (asprintf(&tmp, "*:%s", opt) == -1) {
free(opt);
*errstrp = "memory allocation failed";
return -1;
}
free(opt);
opt = tmp;
}
if ((tmp = strdup(opt)) == NULL) {
free(opt);
*errstrp = "memory allocation failed";
return -1;
}
cp = tmp;
/* validate syntax before recording it. */
host = hpdelim(&cp);
if (host == NULL || strlen(host) >= NI_MAXHOST) {
free(tmp);
free(opt);
*errstrp = "invalid permission hostname";
return -1;
}
/*
* don't want to use permitopen_port to avoid
* dependency on channels.[ch] here.
*/
if (cp == NULL ||
(strcmp(cp, "*") != 0 && a2port(cp) <= 0)) {
free(tmp);
free(opt);
*errstrp = "invalid permission port";
return -1;
}
/* XXX - add streamlocal support */
free(tmp);
/* Record it */
if ((permits = recallocarray(permits, npermits, npermits + 1,
sizeof(*permits))) == NULL) {
free(opt);
/* NB. don't update *permitsp if alloc fails */
*errstrp = "memory allocation failed";
return -1;
}
permits[npermits++] = opt;
*permitsp = permits;
*npermitsp = npermits;
return 0;
}
struct sshauthopt *
sshauthopt_parse(const char *opts, const char **errstrp)
{
char **oarray, *opt, *cp, *tmp;
int r;
struct sshauthopt *ret = NULL;
const char *errstr = "unknown error";
uint64_t valid_before;
if (errstrp != NULL)
*errstrp = NULL;
if ((ret = sshauthopt_new_with_keys_defaults()) == NULL)
goto alloc_fail;
if (opts == NULL)
return ret;
while (*opts && *opts != ' ' && *opts != '\t') {
/* flag options */
if ((r = opt_flag("restrict", 0, &opts)) != -1) {
ret->restricted = 1;
ret->permit_port_forwarding_flag = 0;
ret->permit_agent_forwarding_flag = 0;
ret->permit_x11_forwarding_flag = 0;
ret->permit_pty_flag = 0;
ret->permit_user_rc = 0;
} else if ((r = opt_flag("cert-authority", 0, &opts)) != -1) {
ret->cert_authority = r;
} else if ((r = opt_flag("port-forwarding", 1, &opts)) != -1) {
ret->permit_port_forwarding_flag = r == 1;
} else if ((r = opt_flag("agent-forwarding", 1, &opts)) != -1) {
ret->permit_agent_forwarding_flag = r == 1;
} else if ((r = opt_flag("x11-forwarding", 1, &opts)) != -1) {
ret->permit_x11_forwarding_flag = r == 1;
} else if ((r = opt_flag("touch-required", 1, &opts)) != -1) {
ret->no_require_user_presence = r != 1; /* NB. flip */
} else if ((r = opt_flag("pty", 1, &opts)) != -1) {
ret->permit_pty_flag = r == 1;
} else if ((r = opt_flag("user-rc", 1, &opts)) != -1) {
ret->permit_user_rc = r == 1;
} else if (opt_match(&opts, "command")) {
if (ret->force_command != NULL) {
errstr = "multiple \"command\" clauses";
goto fail;
}
ret->force_command = opt_dequote(&opts, &errstr);
if (ret->force_command == NULL)
goto fail;
} else if (opt_match(&opts, "principals")) {
if (ret->cert_principals != NULL) {
errstr = "multiple \"principals\" clauses";
goto fail;
}
ret->cert_principals = opt_dequote(&opts, &errstr);
if (ret->cert_principals == NULL)
goto fail;
} else if (opt_match(&opts, "from")) {
if (ret->required_from_host_keys != NULL) {
errstr = "multiple \"from\" clauses";
goto fail;
}
ret->required_from_host_keys = opt_dequote(&opts,
&errstr);
if (ret->required_from_host_keys == NULL)
goto fail;
} else if (opt_match(&opts, "expiry-time")) {
if ((opt = opt_dequote(&opts, &errstr)) == NULL)
goto fail;
if (parse_absolute_time(opt, &valid_before) != 0 ||
valid_before == 0) {
free(opt);
errstr = "invalid expires time";
goto fail;
}
free(opt);
if (ret->valid_before == 0 ||
valid_before < ret->valid_before)
ret->valid_before = valid_before;
} else if (opt_match(&opts, "environment")) {
if (ret->nenv > INT_MAX) {
errstr = "too many environment strings";
goto fail;
}
if ((opt = opt_dequote(&opts, &errstr)) == NULL)
goto fail;
/* env name must be alphanumeric and followed by '=' */
if ((tmp = strchr(opt, '=')) == NULL) {
free(opt);
errstr = "invalid environment string";
goto fail;
}
if ((cp = strdup(opt)) == NULL)
goto alloc_fail;
cp[tmp - opt] = '\0'; /* truncate at '=' */
if (!valid_env_name(cp)) {
free(cp);
free(opt);
errstr = "invalid environment string";
goto fail;
}
free(cp);
/* Append it. */
oarray = ret->env;
if ((ret->env = recallocarray(ret->env, ret->nenv,
ret->nenv + 1, sizeof(*ret->env))) == NULL) {
free(opt);
ret->env = oarray; /* put it back for cleanup */
goto alloc_fail;
}
ret->env[ret->nenv++] = opt;
} else if (opt_match(&opts, "permitopen")) {
if (handle_permit(&opts, 0, &ret->permitopen,
&ret->npermitopen, &errstr) != 0)
goto fail;
} else if (opt_match(&opts, "permitlisten")) {
if (handle_permit(&opts, 1, &ret->permitlisten,
&ret->npermitlisten, &errstr) != 0)
goto fail;
} else if (opt_match(&opts, "tunnel")) {
if ((opt = opt_dequote(&opts, &errstr)) == NULL)
goto fail;
ret->force_tun_device = a2tun(opt, NULL);
free(opt);
if (ret->force_tun_device == SSH_TUNID_ERR) {
errstr = "invalid tun device";
goto fail;
}
}
/*
* Skip the comma, and move to the next option
* (or break out if there are no more).
*/
if (*opts == '\0' || *opts == ' ' || *opts == '\t')
break; /* End of options. */
/* Anything other than a comma is an unknown option */
if (*opts != ',') {
errstr = "unknown key option";
goto fail;
}
opts++;
if (*opts == '\0') {
errstr = "unexpected end-of-options";
goto fail;
}
}
/* success */
if (errstrp != NULL)
*errstrp = NULL;
return ret;
alloc_fail:
errstr = "memory allocation failed";
fail:
sshauthopt_free(ret);
if (errstrp != NULL)
*errstrp = errstr;
return NULL;
}
struct sshauthopt *
sshauthopt_from_cert(struct sshkey *k)
{
struct sshauthopt *ret;
if (k == NULL || !sshkey_type_is_cert(k->type) || k->cert == NULL ||
k->cert->type != SSH2_CERT_TYPE_USER)
return NULL;
if ((ret = sshauthopt_new()) == NULL)
return NULL;
/* Handle options and critical extensions separately */
if (cert_option_list(ret, k->cert->critical,
OPTIONS_CRITICAL, 1) == -1) {
sshauthopt_free(ret);
return NULL;
}
if (cert_option_list(ret, k->cert->extensions,
OPTIONS_EXTENSIONS, 0) == -1) {
sshauthopt_free(ret);
return NULL;
}
/* success */
return ret;
}
/*
* Merges "additional" options to "primary" and returns the result.
* NB. Some options from primary have primacy.
*/
struct sshauthopt *
sshauthopt_merge(const struct sshauthopt *primary,
const struct sshauthopt *additional, const char **errstrp)
{
struct sshauthopt *ret;
const char *errstr = "internal error";
const char *tmp;
if (errstrp != NULL)
*errstrp = NULL;
if ((ret = sshauthopt_new()) == NULL)
goto alloc_fail;
/* cert_authority and cert_principals are cleared in result */
/* Prefer access lists from primary. */
/* XXX err is both set and mismatch? */
tmp = primary->required_from_host_cert;
if (tmp == NULL)
tmp = additional->required_from_host_cert;
if (tmp != NULL && (ret->required_from_host_cert = strdup(tmp)) == NULL)
goto alloc_fail;
tmp = primary->required_from_host_keys;
if (tmp == NULL)
tmp = additional->required_from_host_keys;
if (tmp != NULL && (ret->required_from_host_keys = strdup(tmp)) == NULL)
goto alloc_fail;
/*
* force_tun_device, permitopen/permitlisten and environment all
* prefer the primary.
*/
ret->force_tun_device = primary->force_tun_device;
if (ret->force_tun_device == -1)
ret->force_tun_device = additional->force_tun_device;
if (primary->nenv > 0) {
if (dup_strings(&ret->env, &ret->nenv,
primary->env, primary->nenv) != 0)
goto alloc_fail;
} else if (additional->nenv) {
if (dup_strings(&ret->env, &ret->nenv,
additional->env, additional->nenv) != 0)
goto alloc_fail;
}
if (primary->npermitopen > 0) {
if (dup_strings(&ret->permitopen, &ret->npermitopen,
primary->permitopen, primary->npermitopen) != 0)
goto alloc_fail;
} else if (additional->npermitopen > 0) {
if (dup_strings(&ret->permitopen, &ret->npermitopen,
additional->permitopen, additional->npermitopen) != 0)
goto alloc_fail;
}
if (primary->npermitlisten > 0) {
if (dup_strings(&ret->permitlisten, &ret->npermitlisten,
primary->permitlisten, primary->npermitlisten) != 0)
goto alloc_fail;
} else if (additional->npermitlisten > 0) {
if (dup_strings(&ret->permitlisten, &ret->npermitlisten,
additional->permitlisten, additional->npermitlisten) != 0)
goto alloc_fail;
}
#define OPTFLAG_AND(x) ret->x = (primary->x == 1) && (additional->x == 1)
/* Permissive flags are logical-AND (i.e. must be set in both) */
OPTFLAG_AND(permit_port_forwarding_flag);
OPTFLAG_AND(permit_agent_forwarding_flag);
OPTFLAG_AND(permit_x11_forwarding_flag);
OPTFLAG_AND(permit_pty_flag);
OPTFLAG_AND(permit_user_rc);
OPTFLAG_AND(no_require_user_presence);
#undef OPTFLAG_AND
/* Earliest expiry time should win */
if (primary->valid_before != 0)
ret->valid_before = primary->valid_before;
if (additional->valid_before != 0 &&
additional->valid_before < ret->valid_before)
ret->valid_before = additional->valid_before;
/*
* When both multiple forced-command are specified, only
* proceed if they are identical, otherwise fail.
*/
if (primary->force_command != NULL &&
additional->force_command != NULL) {
if (strcmp(primary->force_command,
additional->force_command) == 0) {
/* ok */
ret->force_command = strdup(primary->force_command);
if (ret->force_command == NULL)
goto alloc_fail;
} else {
errstr = "forced command options do not match";
goto fail;
}
} else if (primary->force_command != NULL) {
if ((ret->force_command = strdup(
primary->force_command)) == NULL)
goto alloc_fail;
} else if (additional->force_command != NULL) {
if ((ret->force_command = strdup(
additional->force_command)) == NULL)
goto alloc_fail;
}
/* success */
if (errstrp != NULL)
*errstrp = NULL;
return ret;
alloc_fail:
errstr = "memory allocation failed";
fail:
if (errstrp != NULL)
*errstrp = errstr;
sshauthopt_free(ret);
return NULL;
}
/*
* Copy options
*/
struct sshauthopt *
sshauthopt_copy(const struct sshauthopt *orig)
{
struct sshauthopt *ret;
if ((ret = sshauthopt_new()) == NULL)
return NULL;
#define OPTSCALAR(x) ret->x = orig->x
OPTSCALAR(permit_port_forwarding_flag);
OPTSCALAR(permit_agent_forwarding_flag);
OPTSCALAR(permit_x11_forwarding_flag);
OPTSCALAR(permit_pty_flag);
OPTSCALAR(permit_user_rc);
OPTSCALAR(restricted);
OPTSCALAR(cert_authority);
OPTSCALAR(force_tun_device);
OPTSCALAR(valid_before);
OPTSCALAR(no_require_user_presence);
#undef OPTSCALAR
#define OPTSTRING(x) \
do { \
if (orig->x != NULL && (ret->x = strdup(orig->x)) == NULL) { \
sshauthopt_free(ret); \
return NULL; \
} \
} while (0)
OPTSTRING(cert_principals);
OPTSTRING(force_command);
OPTSTRING(required_from_host_cert);
OPTSTRING(required_from_host_keys);
#undef OPTSTRING
if (dup_strings(&ret->env, &ret->nenv, orig->env, orig->nenv) != 0 ||
dup_strings(&ret->permitopen, &ret->npermitopen,
orig->permitopen, orig->npermitopen) != 0 ||
dup_strings(&ret->permitlisten, &ret->npermitlisten,
orig->permitlisten, orig->npermitlisten) != 0) {
sshauthopt_free(ret);
return NULL;
}
return ret;
}
static int
serialise_array(struct sshbuf *m, char **a, size_t n)
{
struct sshbuf *b;
size_t i;
int r;
if (n > INT_MAX)
return SSH_ERR_INTERNAL_ERROR;
if ((b = sshbuf_new()) == NULL) {
return SSH_ERR_ALLOC_FAIL;
}
for (i = 0; i < n; i++) {
if ((r = sshbuf_put_cstring(b, a[i])) != 0) {
sshbuf_free(b);
return r;
}
}
if ((r = sshbuf_put_u32(m, n)) != 0 ||
(r = sshbuf_put_stringb(m, b)) != 0) {
sshbuf_free(b);
return r;
}
/* success */
return 0;
}
static int
deserialise_array(struct sshbuf *m, char ***ap, size_t *np)
{
char **a = NULL;
size_t i, n = 0;
struct sshbuf *b = NULL;
u_int tmp;
int r = SSH_ERR_INTERNAL_ERROR;
if ((r = sshbuf_get_u32(m, &tmp)) != 0 ||
(r = sshbuf_froms(m, &b)) != 0)
goto out;
if (tmp > INT_MAX) {
r = SSH_ERR_INVALID_FORMAT;
goto out;
}
n = tmp;
if (n > 0 && (a = calloc(n, sizeof(*a))) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
goto out;
}
for (i = 0; i < n; i++) {
if ((r = sshbuf_get_cstring(b, &a[i], NULL)) != 0)
goto out;
}
/* success */
r = 0;
*ap = a;
a = NULL;
*np = n;
n = 0;
out:
if (a != NULL) {
for (i = 0; i < n; i++)
free(a[i]);
free(a);
}
sshbuf_free(b);
return r;
}
static int
serialise_nullable_string(struct sshbuf *m, const char *s)
{
int r;
if ((r = sshbuf_put_u8(m, s == NULL)) != 0 ||
(r = sshbuf_put_cstring(m, s)) != 0)
return r;
return 0;
}
static int
deserialise_nullable_string(struct sshbuf *m, char **sp)
{
int r;
u_char flag;
*sp = NULL;
if ((r = sshbuf_get_u8(m, &flag)) != 0 ||
(r = sshbuf_get_cstring(m, flag ? NULL : sp, NULL)) != 0)
return r;
return 0;
}
int
sshauthopt_serialise(const struct sshauthopt *opts, struct sshbuf *m,
int untrusted)
{
int r = SSH_ERR_INTERNAL_ERROR;
/* Flag options */
if ((r = sshbuf_put_u8(m, opts->permit_port_forwarding_flag)) != 0 ||
(r = sshbuf_put_u8(m, opts->permit_agent_forwarding_flag)) != 0 ||
(r = sshbuf_put_u8(m, opts->permit_x11_forwarding_flag)) != 0 ||
(r = sshbuf_put_u8(m, opts->permit_pty_flag)) != 0 ||
(r = sshbuf_put_u8(m, opts->permit_user_rc)) != 0 ||
(r = sshbuf_put_u8(m, opts->restricted)) != 0 ||
(r = sshbuf_put_u8(m, opts->cert_authority)) != 0 ||
(r = sshbuf_put_u8(m, opts->no_require_user_presence)) != 0)
return r;
/* Simple integer options */
if ((r = sshbuf_put_u64(m, opts->valid_before)) != 0)
return r;
/* tunnel number can be negative to indicate "unset" */
if ((r = sshbuf_put_u8(m, opts->force_tun_device == -1)) != 0 ||
(r = sshbuf_put_u32(m, (opts->force_tun_device < 0) ?
0 : (u_int)opts->force_tun_device)) != 0)
return r;
/* String options; these may be NULL */
if ((r = serialise_nullable_string(m,
untrusted ? "yes" : opts->cert_principals)) != 0 ||
(r = serialise_nullable_string(m,
untrusted ? "true" : opts->force_command)) != 0 ||
(r = serialise_nullable_string(m,
untrusted ? NULL : opts->required_from_host_cert)) != 0 ||
(r = serialise_nullable_string(m,
untrusted ? NULL : opts->required_from_host_keys)) != 0)
return r;
/* Array options */
if ((r = serialise_array(m, opts->env,
untrusted ? 0 : opts->nenv)) != 0 ||
(r = serialise_array(m, opts->permitopen,
untrusted ? 0 : opts->npermitopen)) != 0 ||
(r = serialise_array(m, opts->permitlisten,
untrusted ? 0 : opts->npermitlisten)) != 0)
return r;
/* success */
return 0;
}
int
sshauthopt_deserialise(struct sshbuf *m, struct sshauthopt **optsp)
{
struct sshauthopt *opts = NULL;
int r = SSH_ERR_INTERNAL_ERROR;
u_char f;
u_int tmp;
if ((opts = calloc(1, sizeof(*opts))) == NULL)
return SSH_ERR_ALLOC_FAIL;
/* Flag options */
#define OPT_FLAG(x) \
do { \
if ((r = sshbuf_get_u8(m, &f)) != 0) \
goto out; \
opts->x = f; \
} while (0)
OPT_FLAG(permit_port_forwarding_flag);
OPT_FLAG(permit_agent_forwarding_flag);
OPT_FLAG(permit_x11_forwarding_flag);
OPT_FLAG(permit_pty_flag);
OPT_FLAG(permit_user_rc);
OPT_FLAG(restricted);
OPT_FLAG(cert_authority);
OPT_FLAG(no_require_user_presence);
#undef OPT_FLAG
/* Simple integer options */
if ((r = sshbuf_get_u64(m, &opts->valid_before)) != 0)
goto out;
/* tunnel number can be negative to indicate "unset" */
if ((r = sshbuf_get_u8(m, &f)) != 0 ||
(r = sshbuf_get_u32(m, &tmp)) != 0)
goto out;
opts->force_tun_device = f ? -1 : (int)tmp;
/* String options may be NULL */
if ((r = deserialise_nullable_string(m, &opts->cert_principals)) != 0 ||
(r = deserialise_nullable_string(m, &opts->force_command)) != 0 ||
(r = deserialise_nullable_string(m,
&opts->required_from_host_cert)) != 0 ||
(r = deserialise_nullable_string(m,
&opts->required_from_host_keys)) != 0)
goto out;
/* Array options */
if ((r = deserialise_array(m, &opts->env, &opts->nenv)) != 0 ||
(r = deserialise_array(m,
&opts->permitopen, &opts->npermitopen)) != 0 ||
(r = deserialise_array(m,
&opts->permitlisten, &opts->npermitlisten)) != 0)
goto out;
/* success */
r = 0;
*optsp = opts;
opts = NULL;
out:
sshauthopt_free(opts);
return r;
}
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