135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/*
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* Copyright (c) 2012,2023 Damien Miller <djm@mindrot.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include "log.h"
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#include "misc.h"
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#include "servconf.h"
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#include "xmalloc.h"
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#include "hostfile.h"
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#include "auth.h"
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extern ServerOptions options;
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/*
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* Configuration of enabled authentication methods. Separate from the rest of
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* auth2-*.c because we want to query it during server configuration validity
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* checking in the sshd listener process without pulling all the auth code in
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* too.
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*/
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/* "none" is allowed only one time and it is cleared by userauth_none() later */
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int none_enabled = 1;
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struct authmethod_cfg methodcfg_none = {
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"none",
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NULL,
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&none_enabled
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};
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struct authmethod_cfg methodcfg_pubkey = {
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"publickey",
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"publickey-hostbound-v00@openssh.com",
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&options.pubkey_authentication
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};
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#ifdef GSSAPI
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struct authmethod_cfg methodcfg_gssapi = {
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"gssapi-with-mic",
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NULL,
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&options.gss_authentication
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};
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#endif
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struct authmethod_cfg methodcfg_passwd = {
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"password",
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NULL,
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&options.password_authentication
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};
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struct authmethod_cfg methodcfg_kbdint = {
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"keyboard-interactive",
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NULL,
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&options.kbd_interactive_authentication
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};
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struct authmethod_cfg methodcfg_hostbased = {
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"hostbased",
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NULL,
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&options.hostbased_authentication
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};
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static struct authmethod_cfg *authmethod_cfgs[] = {
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&methodcfg_none,
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&methodcfg_pubkey,
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#ifdef GSSAPI
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&methodcfg_gssapi,
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#endif
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&methodcfg_passwd,
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&methodcfg_kbdint,
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&methodcfg_hostbased,
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NULL
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};
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/*
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* Check a comma-separated list of methods for validity. If need_enable is
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* non-zero, then also require that the methods are enabled.
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* Returns 0 on success or -1 if the methods list is invalid.
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*/
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int
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auth2_methods_valid(const char *_methods, int need_enable)
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{
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char *methods, *omethods, *method, *p;
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u_int i, found;
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int ret = -1;
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const struct authmethod_cfg *cfg;
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if (*_methods == '\0') {
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error("empty authentication method list");
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return -1;
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}
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omethods = methods = xstrdup(_methods);
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while ((method = strsep(&methods, ",")) != NULL) {
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for (found = i = 0; !found && authmethod_cfgs[i] != NULL; i++) {
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cfg = authmethod_cfgs[i];
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if ((p = strchr(method, ':')) != NULL)
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*p = '\0';
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if (strcmp(method, cfg->name) != 0)
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continue;
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if (need_enable) {
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if (cfg->enabled == NULL ||
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*(cfg->enabled) == 0) {
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error("Disabled method \"%s\" in "
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"AuthenticationMethods list \"%s\"",
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method, _methods);
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goto out;
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}
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}
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found = 1;
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break;
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}
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if (!found) {
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error("Unknown authentication method \"%s\" in list",
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method);
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goto out;
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}
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}
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ret = 0;
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out:
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free(omethods);
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return ret;
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}
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