IABSD.fr/src/usr.bin/ssh/auth-krb5.c

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• Author : dtucker
  Date : 2026-02-08 19:54:31
  Hash : a82d9bb4
  Message : Reorder headers according to KNF, and pull in a few we don't have from Portable.

• usr.bin/ssh/auth-krb5.c

• /* $OpenBSD: auth-krb5.c,v 1.26 2026/02/08 19:54:31 dtucker Exp $ */
  /*
   *    Kerberos v5 authentication and ticket-passing routines.
   *
   * From: FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar
   */
  /*
   * Copyright (c) 2002 Daniel Kouril.  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 <pwd.h>
  #include <stdarg.h>
  
  #include "xmalloc.h"
  #include "ssh.h"
  #include "packet.h"
  #include "log.h"
  #include "sshbuf.h"
  #include "sshkey.h"
  #include "misc.h"
  #include "servconf.h"
  #include "uidswap.h"
  #include "hostfile.h"
  #include "auth.h"
  
  #ifdef KRB5
  #include <errno.h>
  #include <unistd.h>
  #include <string.h>
  #include <krb5.h>
  
  extern ServerOptions	 options;
  
  static int
  krb5_init(void *context)
  {
  	Authctxt *authctxt = (Authctxt *)context;
  	krb5_error_code problem;
  
  	if (authctxt->krb5_ctx == NULL) {
  		problem = krb5_init_context(&authctxt->krb5_ctx);
  		if (problem)
  			return (problem);
  		krb5_init_ets(authctxt->krb5_ctx);
  	}
  	return (0);
  }
  
  int
  auth_krb5_password(Authctxt *authctxt, const char *password)
  {
  	krb5_error_code problem;
  	krb5_ccache ccache = NULL;
  	const char *errmsg;
  
  	temporarily_use_uid(authctxt->pw);
  
  	problem = krb5_init(authctxt);
  	if (problem)
  		goto out;
  
  	problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
  		    &authctxt->krb5_user);
  	if (problem)
  		goto out;
  
  	problem = krb5_cc_new_unique(authctxt->krb5_ctx,
  	    krb5_mcc_ops.prefix, NULL, &ccache);
  	if (problem)
  		goto out;
  
  	problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
  		authctxt->krb5_user);
  	if (problem)
  		goto out;
  
  	restore_uid();
  
  	problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
  	    ccache, password, 1, NULL);
  
  	temporarily_use_uid(authctxt->pw);
  
  	if (problem)
  		goto out;
  
  	problem = krb5_cc_new_unique(authctxt->krb5_ctx,
  	    krb5_fcc_ops.prefix, NULL, &authctxt->krb5_fwd_ccache);
  	if (problem)
  		goto out;
  
  	problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
  	    authctxt->krb5_fwd_ccache);
  	krb5_cc_destroy(authctxt->krb5_ctx, ccache);
  	ccache = NULL;
  	if (problem)
  		goto out;
  
  	authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx,
  	    authctxt->krb5_fwd_ccache);
  
   out:
  	restore_uid();
  
  	if (problem) {
  		if (ccache)
  			krb5_cc_destroy(authctxt->krb5_ctx, ccache);
  
  		if (authctxt->krb5_ctx != NULL) {
  			errmsg = krb5_get_error_message(authctxt->krb5_ctx,
  			    problem);
  			debug("Kerberos password authentication failed: %s",
  			    errmsg);
  			krb5_free_error_message(authctxt->krb5_ctx, errmsg);
  		} else
  			debug("Kerberos password authentication failed: %d",
  			    problem);
  
  		krb5_cleanup_proc(authctxt);
  
  		if (options.kerberos_or_local_passwd)
  			return (-1);
  		else
  			return (0);
  	}
  	return (authctxt->valid ? 1 : 0);
  }
  
  void
  krb5_cleanup_proc(Authctxt *authctxt)
  {
  	debug("krb5_cleanup_proc called");
  	if (authctxt->krb5_fwd_ccache) {
  		krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
  		authctxt->krb5_fwd_ccache = NULL;
  	}
  	if (authctxt->krb5_user) {
  		krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
  		authctxt->krb5_user = NULL;
  	}
  	if (authctxt->krb5_ctx) {
  		krb5_free_context(authctxt->krb5_ctx);
  		authctxt->krb5_ctx = NULL;
  	}
  }
  
  #endif /* KRB5 */