 @@ -1,287 +1,287 @@
-/*	$NetBSD: pam_ksu.c,v 1.5 2011/04/25 22:01:04 christos Exp $	*/
+/*	$NetBSD: pam_ksu.c,v 1.6 2011/04/25 22:03:20 christos Exp $	*/
 /*-
  * Copyright (c) 2002 Jacques A. Vidrine <nectar@FreeBSD.org>
  * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/cdefs.h>
 #ifdef __FreeBSD__
 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_ksu/pam_ksu.c,v 1.5 2004/02/10 10:13:21 des Exp $");
 #else
-__RCSID("$NetBSD: pam_ksu.c,v 1.5 2011/04/25 22:01:04 christos Exp $");
+__RCSID("$NetBSD: pam_ksu.c,v 1.6 2011/04/25 22:03:20 christos Exp $");
 #endif
 #include <sys/param.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <krb5/krb5.h>
 #define PAM_SM_AUTH
 #define PAM_SM_CRED
 #include <security/pam_appl.h>
 #include <security/pam_modules.h>
 #include <security/pam_mod_misc.h>
 static const char superuser[] = "root";
 #define PASSWORD_PROMPT	"%s's password:"
 static void	log_krb5(krb5_context, krb5_error_code, const char *, ...)
     __printflike(3, 4);
 static long	get_su_principal(krb5_context, const char *, const char *,
 		    char **, krb5_principal *);
 static int	auth_krb5(pam_handle_t *, krb5_context, const char *,
 		    krb5_principal);
 PAM_EXTERN int
 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
     int argc __unused, const char *argv[] __unused)
+{
 	krb5_context	 context;
 	krb5_principal	 su_principal;
 	const char	*user;
 	const void	*ruser;
 	char		*su_principal_name;
 	long		 rv;
 	int		 pamret;
 	pamret = pam_get_user(pamh, &user, NULL);
 	if (pamret != PAM_SUCCESS)
 		return (pamret);
 	PAM_LOG("Got user: %s", user);
 	pamret = pam_get_item(pamh, PAM_RUSER, &ruser);
 	if (pamret != PAM_SUCCESS)
 		return (pamret);
 	PAM_LOG("Got ruser: %s", (const char *)ruser);
 	rv = krb5_init_context(&context);
 	if (rv != 0) {
 		log_krb5(context, rv, "krb5_init_context failed");
 		return (PAM_SERVICE_ERR);
+	}
 	rv = get_su_principal(context, user, ruser, &su_principal_name, &su_principal);
 	if (rv != 0)
 		return (PAM_AUTH_ERR);
 	PAM_LOG("kuserok: %s -> %s", su_principal_name, user);
 	rv = krb5_kuserok(context, su_principal, user);
 	pamret = rv ? auth_krb5(pamh, context, su_principal_name, su_principal) : PAM_AUTH_ERR;
 	free(su_principal_name);
 	krb5_free_principal(context, su_principal);
 	krb5_free_context(context);
 	return (pamret);
+}
 PAM_EXTERN int
 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
     int ac __unused, const char *av[] __unused)
+{
 	return (PAM_SUCCESS);
+}
 /* Authenticate using Kerberos 5.
  *   pamh              -- The PAM handle.
  *   context           -- An initialized krb5_context.
  *   su_principal_name -- The target principal name, used only for password prompts.
  *              If NULL, the password prompts will not include a principal
  *              name.
  *   su_principal      -- The target krb5_principal.
  * Note that a valid keytab in the default location with a host entry
  * must be available, and that the PAM application must have sufficient
  * privileges to access it.
  * Returns PAM_SUCCESS if authentication was successful, or an appropriate
  * PAM error code if it was not.
  */
 static int
 auth_krb5(pam_handle_t *pamh, krb5_context context, const char *su_principal_name,
     krb5_principal su_principal)
+{
 	krb5_creds	 creds;
 	krb5_get_init_creds_opt *gic_opt;
 	krb5_verify_init_creds_opt vic_opt;
 	const char	*pass;
 	char		 prompt[80];
 	long		 rv;
 	int		 pamret;
 	rv = krb5_get_init_creds_opt_alloc(context, &gic_opt);
 	if (rv != 0) {
 		log_krb5(context, rv, "krb5_get_init_creds_opt_alloc");
 		return (PAM_SERVICE_ERR);
+	}
 	krb5_verify_init_creds_opt_init(&vic_opt);
 	if (su_principal_name != NULL)
 		(void)snprintf(prompt, sizeof(prompt), PASSWORD_PROMPT,
 		    su_principal_name);
 	else
 		(void)snprintf(prompt, sizeof(prompt), "Password:");
 	if (prompt == NULL)
 		return (PAM_BUF_ERR);
 	pass = NULL;
 	pamret = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, prompt);
 	if (pamret != PAM_SUCCESS)
 		return (pamret);
 	rv = krb5_get_init_creds_password(context, &creds, su_principal,
 	    pass, NULL, NULL, 0, NULL, gic_opt);
 	if (rv != 0) {
 		log_krb5(context, rv, "krb5_get_init_creds_password");
 		return (PAM_AUTH_ERR);
+	}
 	krb5_verify_init_creds_opt_set_ap_req_nofail(&vic_opt, 1);
 	rv = krb5_verify_init_creds(context, &creds, NULL, NULL, NULL,
 	    &vic_opt);
 	krb5_free_cred_contents(context, &creds);
 	if (rv != 0) {
 		log_krb5(context, rv, "krb5_verify_init_creds");
 		return (PAM_AUTH_ERR);
+	}
 	return (PAM_SUCCESS);
+}
 static void
 log_krb5(krb5_context ctx, krb5_error_code err, const char *fmt, ...)
+{
 	char b1[1024], b2[1024];
 	const char *errtxt;
 	va_list ap;
 	va_start(ap, fmt);
 	vsnprintf(b1, sizeof(b1), fmt, ap);
 	va_end(ap);
 	if (ctx)
 		errtxt = krb5_get_error_message(ctx, err);
 	else
 		errtxt = NULL;
 	if (errtxt != NULL) {
 		krb5_free_error_message(ctx, errtxt);
 		snprintf(b2, sizeof(b2), "%s (%s)", b1, errtxt);
 	} else {
-		snprintf(b2, sizeof(b1), "%s (unknown %d)", b1, (int)err);
+		snprintf(b2, sizeof(b2), "%s (unknown %d)", b1, (int)err);
+	}
 	PAM_LOG(b2);
+}
 /* Determine the target principal given the current user and the target user.
  *   context           -- An initialized krb5_context.
  *   target_user       -- The target username.
  *   current_user      -- The current username.
  *   su_principal_name -- (out) The target principal name.
  *   su_principal      -- (out) The target krb5_principal.
  * When the target user is `root', the target principal will be a `root
  * instance', e.g. `luser/root@REA.LM'.  Otherwise, the target principal
  * will simply be the current user's default principal name.  Note that
  * in any case, if KRB5CCNAME is set and a credentials cache exists, the
  * principal name found there will be the `starting point', rather than
  * the ruser parameter.
+ *
  * Returns 0 for success, or a com_err error code on failure.
  */
 static long
 get_su_principal(krb5_context context, const char *target_user, const char *current_user,
     char **su_principal_name, krb5_principal *su_principal)
+{
 	krb5_principal	 default_principal;
 	krb5_ccache	 ccache;
 	char		*principal_name, *ccname, *p;
 	long		 rv;
 	uid_t		 euid, ruid;
 	*su_principal = NULL;
 	default_principal = NULL;
 	/* Unless KRB5CCNAME was explicitly set, we won't really be able
 	 * to look at the credentials cache since krb5_cc_default will
 	 * look at getuid().
 	 */
 	ruid = getuid();
 	euid = geteuid();
 	rv = seteuid(ruid);
 	if (rv != 0)
 		return (errno);
 	p = getenv("KRB5CCNAME");
 	if (p != NULL)
 		ccname = strdup(p);
 	else
 		(void)asprintf(&ccname, "%s%lu", KRB5_DEFAULT_CCROOT, (unsigned long)ruid);
 	if (ccname == NULL)
 		return (errno);
 	rv = krb5_cc_resolve(context, ccname, &ccache);
 	free(ccname);
 	if (rv == 0) {
 		rv = krb5_cc_get_principal(context, ccache, &default_principal);
 		krb5_cc_close(context, ccache);
 		if (rv != 0)
 			default_principal = NULL; /* just to be safe */
+	}
 	rv = seteuid(euid);
 	if (rv != 0)
 		return (errno);
 	if (default_principal == NULL) {
 		rv = krb5_make_principal(context, &default_principal, NULL, current_user, NULL);
 		if (rv != 0) {
 			PAM_LOG("Could not determine default principal name.");
 			return (rv);
+		}
+	}
 	/* Now that we have some principal, if the target account is
 	 * `root', then transform it into a `root' instance, e.g.
 	 * `user@REA.LM' -> `user/root@REA.LM'.
 	 */
 	rv = krb5_unparse_name(context, default_principal, &principal_name);
 	krb5_free_principal(context, default_principal);
 	if (rv != 0) {
 		log_krb5(context, rv, "krb5_unparse_name");
 		return (rv);
+	}
 	PAM_LOG("Default principal name: %s", principal_name);
 	if (strcmp(target_user, superuser) == 0) {
 		p = strrchr(principal_name, '@');
 		if (p == NULL) {
 			PAM_LOG("malformed principal name `%s'", principal_name);
 			free(principal_name);
 			return (rv);
+		}
 		*p++ = '\0';
 		*su_principal_name = NULL;
 		(void)asprintf(su_principal_name, "%s/%s@%s", principal_name, superuser, p);
 		free(principal_name);
 	} else
 		*su_principal_name = principal_name;
 	if (*su_principal_name == NULL)
 		return (errno);
 	rv = krb5_parse_name(context, *su_principal_name, &default_principal);
 	if (rv != 0) {
 		log_krb5(context, rv, "krb5_parse_name `%s'",
 		    *su_principal_name);
 		return (rv);
+	}
 	PAM_LOG("Target principal name: %s", *su_principal_name);
 	*su_principal = default_principal;
 	return (0);
+}
 PAM_MODULE_ENTRY("pam_ksu");