зеркало из https://github.com/Azure/sonic-openssh.git
- markus@cvs.openbsd.org 2013/03/07 19:27:25
[auth.h auth2-chall.c auth2.c monitor.c sshd_config.5]
add submethod support to AuthenticationMethods; ok and freedback djm@
This commit is contained in:
Damien Miller
Родитель
4ce189d910
Коммит
91a55f28f3
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@ -19,6 +19,9 @@
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have included a style (e.g. "root:skey") when checking public key
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signatures. Fixes public key and hostbased auth when the client specified
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a style; ok markus@
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- markus@cvs.openbsd.org 2013/03/07 19:27:25
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[auth.h auth2-chall.c auth2.c monitor.c sshd_config.5]
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add submethod support to AuthenticationMethods; ok and freedback djm@
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20130418
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- (djm) [config.guess config.sub] Update to last versions before they switch
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5
auth.h
5
auth.h
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@ -1,4 +1,4 @@
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/* $OpenBSD: auth.h,v 1.72 2012/12/02 20:34:09 djm Exp $ */
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/* $OpenBSD: auth.h,v 1.73 2013/03/07 19:27:25 markus Exp $ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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@ -157,8 +157,9 @@ void userauth_send_banner(const char *);
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char *auth2_read_banner(void);
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int auth2_methods_valid(const char *, int);
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int auth2_update_methods_lists(Authctxt *, const char *);
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int auth2_update_methods_lists(Authctxt *, const char *, const char *);
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int auth2_setup_methods_lists(Authctxt *);
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int auth2_method_allowed(Authctxt *, const char *, const char *);
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void privsep_challenge_enable(void);
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@ -1,4 +1,4 @@
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/* $OpenBSD: auth2-chall.c,v 1.36 2012/12/03 00:14:06 djm Exp $ */
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/* $OpenBSD: auth2-chall.c,v 1.37 2013/03/07 19:27:25 markus Exp $ */
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/*
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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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* Copyright (c) 2001 Per Allansson. All rights reserved.
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@ -155,7 +155,7 @@ kbdint_free(KbdintAuthctxt *kbdintctxt)
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}
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/* get next device */
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static int
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kbdint_next_device(KbdintAuthctxt *kbdintctxt)
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kbdint_next_device(Authctxt *authctxt, KbdintAuthctxt *kbdintctxt)
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{
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size_t len;
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char *t;
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@ -169,9 +169,13 @@ kbdint_next_device(KbdintAuthctxt *kbdintctxt)
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if (len == 0)
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break;
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for (i = 0; devices[i]; i++)
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for (i = 0; devices[i]; i++) {
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if (!auth2_method_allowed(authctxt,
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"keyboard-interactive", devices[i]->name))
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continue;
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if (strncmp(kbdintctxt->devices, devices[i]->name, len) == 0)
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kbdintctxt->device = devices[i];
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}
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t = kbdintctxt->devices;
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kbdintctxt->devices = t[len] ? xstrdup(t+len+1) : NULL;
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xfree(t);
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@ -221,7 +225,7 @@ auth2_challenge_start(Authctxt *authctxt)
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debug2("auth2_challenge_start: devices %s",
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kbdintctxt->devices ? kbdintctxt->devices : "<empty>");
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if (kbdint_next_device(kbdintctxt) == 0) {
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if (kbdint_next_device(authctxt, kbdintctxt) == 0) {
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auth2_challenge_stop(authctxt);
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return 0;
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}
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76
auth2.c
76
auth2.c
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@ -1,4 +1,4 @@
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/* $OpenBSD: auth2.c,v 1.126 2012/12/02 20:34:09 djm Exp $ */
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/* $OpenBSD: auth2.c,v 1.127 2013/03/07 19:27:25 markus Exp $ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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@ -98,8 +98,12 @@ static void input_userauth_request(int, u_int32_t, void *);
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/* helper */
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static Authmethod *authmethod_lookup(Authctxt *, const char *);
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static char *authmethods_get(Authctxt *authctxt);
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static int method_allowed(Authctxt *, const char *);
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static int list_starts_with(const char *, const char *);
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#define MATCH_NONE 0 /* method or submethod mismatch */
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#define MATCH_METHOD 1 /* method matches (no submethod specified) */
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#define MATCH_BOTH 2 /* method and submethod match */
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#define MATCH_PARTIAL 3 /* method matches, submethod can't be checked */
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static int list_starts_with(const char *, const char *, const char *);
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char *
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auth2_read_banner(void)
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@ -316,7 +320,7 @@ userauth_finish(Authctxt *authctxt, int authenticated, const char *method,
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}
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if (authenticated && options.num_auth_methods != 0) {
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if (!auth2_update_methods_lists(authctxt, method)) {
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if (!auth2_update_methods_lists(authctxt, method, submethod)) {
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authenticated = 0;
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partial = 1;
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}
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@ -387,8 +391,9 @@ userauth_finish(Authctxt *authctxt, int authenticated, const char *method,
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* methods list. Returns 1 if allowed, or no methods lists configured.
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* 0 otherwise.
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*/
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static int
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method_allowed(Authctxt *authctxt, const char *method)
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int
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auth2_method_allowed(Authctxt *authctxt, const char *method,
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const char *submethod)
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{
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u_int i;
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@ -399,7 +404,8 @@ method_allowed(Authctxt *authctxt, const char *method)
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if (options.num_auth_methods == 0)
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return 1;
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for (i = 0; i < authctxt->num_auth_methods; i++) {
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if (list_starts_with(authctxt->auth_methods[i], method))
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if (list_starts_with(authctxt->auth_methods[i], method,
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submethod) != MATCH_NONE)
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return 1;
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}
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return 0;
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@ -419,7 +425,8 @@ authmethods_get(Authctxt *authctxt)
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if (authmethods[i]->enabled == NULL ||
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*(authmethods[i]->enabled) == 0)
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continue;
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if (!method_allowed(authctxt, authmethods[i]->name))
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if (!auth2_method_allowed(authctxt, authmethods[i]->name,
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NULL))
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continue;
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if (buffer_len(&b) > 0)
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buffer_append(&b, ",", 1);
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@ -442,7 +449,8 @@ authmethod_lookup(Authctxt *authctxt, const char *name)
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if (authmethods[i]->enabled != NULL &&
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*(authmethods[i]->enabled) != 0 &&
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strcmp(name, authmethods[i]->name) == 0 &&
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method_allowed(authctxt, authmethods[i]->name))
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auth2_method_allowed(authctxt,
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authmethods[i]->name, NULL))
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return authmethods[i];
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debug2("Unrecognized authentication method name: %s",
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name ? name : "NULL");
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@ -457,7 +465,7 @@ authmethod_lookup(Authctxt *authctxt, const char *name)
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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;
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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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@ -468,6 +476,8 @@ auth2_methods_valid(const char *_methods, int need_enable)
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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 && authmethods[i] != NULL; i++) {
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if ((p = strchr(method, ':')) != NULL)
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*p = '\0';
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if (strcmp(method, authmethods[i]->name) != 0)
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continue;
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if (need_enable) {
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@ -533,15 +543,30 @@ auth2_setup_methods_lists(Authctxt *authctxt)
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}
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static int
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list_starts_with(const char *methods, const char *method)
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list_starts_with(const char *methods, const char *method,
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const char *submethod)
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{
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size_t l = strlen(method);
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int match;
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const char *p;
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if (strncmp(methods, method, l) != 0)
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return 0;
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if (methods[l] != ',' && methods[l] != '\0')
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return 0;
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return 1;
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return MATCH_NONE;
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p = methods + l;
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match = MATCH_METHOD;
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if (*p == ':') {
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if (!submethod)
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return MATCH_PARTIAL;
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l = strlen(submethod);
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p += 1;
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if (strncmp(submethod, p, l))
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return MATCH_NONE;
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p += l;
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match = MATCH_BOTH;
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}
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if (*p != ',' && *p != '\0')
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return MATCH_NONE;
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return match;
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}
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/*
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@ -550,14 +575,21 @@ list_starts_with(const char *methods, const char *method)
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* if it did.
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*/
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static int
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remove_method(char **methods, const char *method)
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remove_method(char **methods, const char *method, const char *submethod)
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{
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char *omethods = *methods;
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char *omethods = *methods, *p;
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size_t l = strlen(method);
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int match;
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if (!list_starts_with(omethods, method))
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match = list_starts_with(omethods, method, submethod);
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if (match != MATCH_METHOD && match != MATCH_BOTH)
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return 0;
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*methods = xstrdup(omethods + l + (omethods[l] == ',' ? 1 : 0));
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p = omethods + l;
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if (submethod && match == MATCH_BOTH)
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p += 1 + strlen(submethod); /* include colon */
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if (*p == ',')
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p++;
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*methods = xstrdup(p);
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free(omethods);
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return 1;
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}
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@ -569,13 +601,15 @@ remove_method(char **methods, const char *method)
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* Returns 1 if the method completed any authentication list or 0 otherwise.
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*/
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int
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auth2_update_methods_lists(Authctxt *authctxt, const char *method)
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auth2_update_methods_lists(Authctxt *authctxt, const char *method,
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const char *submethod)
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{
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u_int i, found = 0;
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debug3("%s: updating methods list after \"%s\"", __func__, method);
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for (i = 0; i < authctxt->num_auth_methods; i++) {
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if (!remove_method(&(authctxt->auth_methods[i]), method))
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if (!remove_method(&(authctxt->auth_methods[i]), method,
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submethod))
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continue;
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found = 1;
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if (*authctxt->auth_methods[i] == '\0') {
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11
monitor.c
11
monitor.c
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@ -1,4 +1,4 @@
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/* $OpenBSD: monitor.c,v 1.121 2013/03/07 00:19:59 djm Exp $ */
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/* $OpenBSD: monitor.c,v 1.122 2013/03/07 19:27:25 markus Exp $ */
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/*
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* Copyright 2002 Niels Provos <provos@citi.umich.edu>
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* Copyright 2002 Markus Friedl <markus@openbsd.org>
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@ -392,7 +392,7 @@ monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
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"with SSH protocol 1");
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if (authenticated &&
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!auth2_update_methods_lists(authctxt,
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auth_method)) {
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auth_method, auth_submethod)) {
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debug3("%s: method %s: partial", __func__,
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auth_method);
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authenticated = 0;
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@ -949,9 +949,10 @@ mm_answer_bsdauthrespond(int sock, Buffer *m)
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debug3("%s: sending authenticated: %d", __func__, authok);
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mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
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if (compat20)
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auth_method = "keyboard-interactive"; /* XXX auth_submethod */
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else
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if (compat20) {
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auth_method = "keyboard-interactive";
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auth_submethod = "bsdauth";
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} else
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auth_method = "bsdauth";
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return (authok != 0);
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@ -33,8 +33,8 @@
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $OpenBSD: sshd_config.5,v 1.156 2013/02/06 00:20:42 dtucker Exp $
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.Dd $Mdocdate: February 6 2013 $
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.\" $OpenBSD: sshd_config.5,v 1.157 2013/03/07 19:27:25 markus Exp $
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.Dd $Mdocdate: March 7 2013 $
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.Dt SSHD_CONFIG 5
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.Os
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.Sh NAME
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@ -180,6 +180,20 @@ Only methods that are next in one or more lists are offered at each stage,
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so for this example, it would not be possible to attempt password or
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keyboard-interactive authentication before public key.
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.Pp
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For keyboard interactive authentication it is also possible to
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restrict authentication to a specific device by appending a
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colon followed by the device identifier
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.Dq bsdauth ,
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.Dq pam ,
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or
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.Dq skey ,
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depending on the server configuration.
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For example,
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.Dq keyboard-interactive:bsdauth
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would restrict keyboard interactive authentication to the
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.Dq bsdauth
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device.
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.Pp
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This option is only available for SSH protocol 2 and will yield a fatal
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error if enabled if protocol 1 is also enabled.
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Note that each authentication method listed should also be explicitly enabled
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