Blame SOURCES/sudo-1.8.6p3-cycledetect.patch

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diff -up sudo-1.8.6p3/plugins/sudoers/alias.c.cycledetect sudo-1.8.6p3/plugins/sudoers/alias.c
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--- sudo-1.8.6p3/plugins/sudoers/alias.c.cycledetect	2012-09-18 15:56:29.000000000 +0200
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+++ sudo-1.8.6p3/plugins/sudoers/alias.c	2013-08-09 10:52:04.785860905 +0200
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@@ -1,5 +1,5 @@
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 /*
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- * Copyright (c) 2004-2005, 2007-2011
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+ * Copyright (c) 2004-2005, 2007-2013
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  *	Todd C. Miller <Todd.Miller@courtesan.com>
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  *
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  * Permission to use, copy, modify, and distribute this software for any
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@@ -50,7 +50,6 @@
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  * Globals
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  */
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 struct rbtree *aliases;
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-unsigned int alias_seqno;
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 /*
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  * Comparison function for the red-black tree.
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@@ -76,29 +75,31 @@ alias_compare(const void *v1, const void
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 /*
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  * Search the tree for an alias with the specified name and type.
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  * Returns a pointer to the alias structure or NULL if not found.
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+ * Caller is responsible for calling alias_put() on the returned
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+ * alias to mark it as unused.
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  */
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 struct alias *
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-alias_find(char *name, int type)
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+alias_get(char *name, int type)
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 {
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     struct alias key;
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     struct rbnode *node;
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     struct alias *a = NULL;
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-    debug_decl(alias_find, SUDO_DEBUG_ALIAS)
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+    debug_decl(alias_get, SUDO_DEBUG_ALIAS)
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     key.name = name;
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     key.type = type;
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     if ((node = rbfind(aliases, &key)) != NULL) {
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 	/*
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-	 * Compare the global sequence number with the one stored
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-	 * in the alias.  If they match then we've seen this alias
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-	 * before and found a loop.
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+	 * Check whether this alias is already in use.
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+	 * If so, we've detected a loop.  If not, set the flag,
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+	 * which the caller should clear with a call to alias_put().
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 	 */
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 	a = node->data;
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-	if (a->seqno == alias_seqno) {
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+	if (a->used) {
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 	    errno = ELOOP;
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 	    debug_return_ptr(NULL);
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 	}
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-	a->seqno = alias_seqno;
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+	a->used = true;
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     } else {
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 	errno = ENOENT;
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     }
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@@ -106,6 +107,17 @@ alias_find(char *name, int type)
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 }
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 /*
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+ * Clear the "used" flag in an alias once the caller is done with it.
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+ */
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+void
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+alias_put(struct alias *a)
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+{
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+    debug_decl(alias_put, SUDO_DEBUG_ALIAS)
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+    a->used = false;
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+    debug_return;
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+}
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+
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+/*
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  * Add an alias to the aliases redblack tree.
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  * Returns NULL on success and an error string on failure.
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  */
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@@ -119,7 +131,7 @@ alias_add(char *name, int type, struct m
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     a = ecalloc(1, sizeof(*a));
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     a->name = name;
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     a->type = type;
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-    /* a->seqno = 0; */
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+    /* a->used = false; */
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     list2tq(&a->members, members);
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     if (rbinsert(aliases, a)) {
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 	snprintf(errbuf, sizeof(errbuf), _("Alias `%s' already defined"), name);
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diff -up sudo-1.8.6p3/plugins/sudoers/match.c.cycledetect sudo-1.8.6p3/plugins/sudoers/match.c
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--- sudo-1.8.6p3/plugins/sudoers/match.c.cycledetect	2013-08-09 10:52:04.783860895 +0200
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+++ sudo-1.8.6p3/plugins/sudoers/match.c	2013-08-09 10:52:04.785860905 +0200
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@@ -101,13 +101,13 @@ static bool command_matches_normal(char
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  * Check for user described by pw in a list of members.
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  * Returns ALLOW, DENY or UNSPEC.
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  */
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-static int
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-_userlist_matches(struct passwd *pw, struct member_list *list)
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+int
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+userlist_matches(struct passwd *pw, struct member_list *list)
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 {
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     struct member *m;
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     struct alias *a;
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     int rval, matched = UNSPEC;
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-    debug_decl(_userlist_matches, SUDO_DEBUG_MATCH)
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+    debug_decl(userlist_matches, SUDO_DEBUG_MATCH)
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     tq_foreach_rev(list, m) {
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 	switch (m->type) {
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@@ -123,10 +123,11 @@ _userlist_matches(struct passwd *pw, str
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 		    matched = !m->negated;
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 		break;
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 	    case ALIAS:
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-		if ((a = alias_find(m->name, USERALIAS)) != NULL) {
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-		    rval = _userlist_matches(pw, &a->members);
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+		if ((a = alias_get(m->name, USERALIAS)) != NULL) {
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+		    rval = userlist_matches(pw, &a->members);
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 		    if (rval != UNSPEC)
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 			matched = m->negated ? !rval : rval;
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+		    alias_put(a);
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 		    break;
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 		}
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 		/* FALLTHROUGH */
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@@ -141,20 +142,13 @@ _userlist_matches(struct passwd *pw, str
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     debug_return_bool(matched);
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 }
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-int
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-userlist_matches(struct passwd *pw, struct member_list *list)
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-{
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-    alias_seqno++;
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-    return _userlist_matches(pw, list);
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-}
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-
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 /*
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  * Check for user described by pw in a list of members.
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  * If both lists are empty compare against def_runas_default.
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  * Returns ALLOW, DENY or UNSPEC.
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  */
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-static int
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-_runaslist_matches(struct member_list *user_list,
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+int
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+runaslist_matches(struct member_list *user_list,
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     struct member_list *group_list, struct member **matching_user,
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     struct member **matching_group)
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 {
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@@ -163,7 +157,7 @@ _runaslist_matches(struct member_list *u
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     int rval;
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     int user_matched = UNSPEC;
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     int group_matched = UNSPEC;
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-    debug_decl(_runaslist_matches, SUDO_DEBUG_MATCH)
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+    debug_decl(runaslist_matches, SUDO_DEBUG_MATCH)
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     if (runas_pw != NULL) {
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 	/* If no runas user or runas group listed in sudoers, use default. */
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@@ -184,11 +178,12 @@ _runaslist_matches(struct member_list *u
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 			user_matched = !m->negated;
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 		    break;
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 		case ALIAS:
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-		    if ((a = alias_find(m->name, RUNASALIAS)) != NULL) {
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-			rval = _runaslist_matches(&a->members, &empty,
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+		    if ((a = alias_get(m->name, RUNASALIAS)) != NULL) {
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+			rval = runaslist_matches(&a->members, &empty,
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 			    matching_user, NULL);
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 			if (rval != UNSPEC)
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 			    user_matched = m->negated ? !rval : rval;
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+			alias_put(a);
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 			break;
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 		    }
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 		    /* FALLTHROUGH */
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@@ -221,11 +216,12 @@ _runaslist_matches(struct member_list *u
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 		    group_matched = !m->negated;
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 		    break;
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 		case ALIAS:
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-		    if ((a = alias_find(m->name, RUNASALIAS)) != NULL) {
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-			rval = _runaslist_matches(&empty, &a->members,
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+		    if ((a = alias_get(m->name, RUNASALIAS)) != NULL) {
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+			rval = runaslist_matches(&empty, &a->members,
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 			    NULL, matching_group);
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 			if (rval != UNSPEC)
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 			    group_matched = m->negated ? !rval : rval;
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+			alias_put(a);
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 			break;
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 		    }
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 		    /* FALLTHROUGH */
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@@ -253,27 +249,17 @@ _runaslist_matches(struct member_list *u
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     debug_return_int(UNSPEC);
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 }
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-int
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-runaslist_matches(struct member_list *user_list,
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-    struct member_list *group_list, struct member **matching_user,
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-    struct member **matching_group)
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-{
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-    alias_seqno++;
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-    return _runaslist_matches(user_list ? user_list : &empty,
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-	group_list ? group_list : &empty, matching_user, matching_group);
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-}
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-
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 /*
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  * Check for host and shost in a list of members.
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  * Returns ALLOW, DENY or UNSPEC.
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  */
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-static int
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-_hostlist_matches(struct member_list *list)
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+int
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+hostlist_matches(struct member_list *list)
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 {
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     struct member *m;
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     struct alias *a;
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     int rval, matched = UNSPEC;
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-    debug_decl(_hostlist_matches, SUDO_DEBUG_MATCH)
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+    debug_decl(hostlist_matches, SUDO_DEBUG_MATCH)
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     tq_foreach_rev(list, m) {
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 	switch (m->type) {
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@@ -289,10 +275,11 @@ _hostlist_matches(struct member_list *li
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 		    matched = !m->negated;
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 		break;
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 	    case ALIAS:
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-		if ((a = alias_find(m->name, HOSTALIAS)) != NULL) {
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-		    rval = _hostlist_matches(&a->members);
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+		if ((a = alias_get(m->name, HOSTALIAS)) != NULL) {
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+		    rval = hostlist_matches(&a->members);
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 		    if (rval != UNSPEC)
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 			matched = m->negated ? !rval : rval;
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+		    alias_put(a);
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 		    break;
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 		}
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 		/* FALLTHROUGH */
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@@ -307,23 +294,16 @@ _hostlist_matches(struct member_list *li
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     debug_return_bool(matched);
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 }
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-int
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-hostlist_matches(struct member_list *list)
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-{
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-    alias_seqno++;
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-    return _hostlist_matches(list);
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-}
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-
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 /*
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  * Check for cmnd and args in a list of members.
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  * Returns ALLOW, DENY or UNSPEC.
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  */
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-static int
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-_cmndlist_matches(struct member_list *list)
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+int
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+cmndlist_matches(struct member_list *list)
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 {
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     struct member *m;
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     int matched = UNSPEC;
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-    debug_decl(_cmndlist_matches, SUDO_DEBUG_MATCH)
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+    debug_decl(cmndlist_matches, SUDO_DEBUG_MATCH)
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     tq_foreach_rev(list, m) {
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 	matched = cmnd_matches(m);
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@@ -333,13 +313,6 @@ _cmndlist_matches(struct member_list *li
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     debug_return_bool(matched);
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 }
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-int
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-cmndlist_matches(struct member_list *list)
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-{
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-    alias_seqno++;
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-    return _cmndlist_matches(list);
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-}
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-
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 /*
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  * Check cmnd and args.
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  * Returns ALLOW, DENY or UNSPEC.
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@@ -357,11 +330,11 @@ cmnd_matches(struct member *m)
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 	    matched = !m->negated;
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 	    break;
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 	case ALIAS:
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-	    alias_seqno++;
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-	    if ((a = alias_find(m->name, CMNDALIAS)) != NULL) {
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-		rval = _cmndlist_matches(&a->members);
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+	    if ((a = alias_get(m->name, CMNDALIAS)) != NULL) {
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+		rval = cmndlist_matches(&a->members);
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 		if (rval != UNSPEC)
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 		    matched = m->negated ? !rval : rval;
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+		alias_put(a);
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 	    }
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 	    break;
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 	case COMMAND:
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diff -up sudo-1.8.6p3/plugins/sudoers/parse.c.cycledetect sudo-1.8.6p3/plugins/sudoers/parse.c
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--- sudo-1.8.6p3/plugins/sudoers/parse.c.cycledetect	2012-09-18 15:57:43.000000000 +0200
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+++ sudo-1.8.6p3/plugins/sudoers/parse.c	2013-08-09 10:52:04.785860905 +0200
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@@ -676,13 +676,14 @@ _print_member(struct lbuf *lbuf, char *n
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 	    }
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 	    break;
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 	case ALIAS:
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-	    if ((a = alias_find(name, alias_type)) != NULL) {
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+	    if ((a = alias_get(name, alias_type)) != NULL) {
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 		tq_foreach_fwd(&a->members, m) {
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 		    if (m != tq_first(&a->members))
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 			lbuf_append(lbuf, ", ");
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 		    _print_member(lbuf, m->name, m->type,
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 			negated ? !m->negated : m->negated, alias_type);
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 		}
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+		alias_put(a);
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 		break;
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 	    }
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 	    /* FALLTHROUGH */
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@@ -697,6 +698,5 @@ static void
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 print_member(struct lbuf *lbuf, char *name, int type, int negated,
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     int alias_type)
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 {
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-    alias_seqno++;
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     _print_member(lbuf, name, type, negated, alias_type);
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 }
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diff -up sudo-1.8.6p3/plugins/sudoers/parse.h.cycledetect sudo-1.8.6p3/plugins/sudoers/parse.h
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--- sudo-1.8.6p3/plugins/sudoers/parse.h.cycledetect	2012-09-18 15:56:29.000000000 +0200
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+++ sudo-1.8.6p3/plugins/sudoers/parse.h	2013-08-09 10:54:30.984565529 +0200
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@@ -148,7 +148,7 @@ struct runascontainer {
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 struct alias {
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     char *name;				/* alias name */
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     unsigned short type;		/* {USER,HOST,RUNAS,CMND}ALIAS */
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-    unsigned short seqno;		/* sequence number */
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+    bool used;				/* "used" flag for cycle detection */
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     struct member_list members;		/* list of alias members */
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 };
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@@ -170,35 +170,39 @@ struct defaults {
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 extern struct userspec_list userspecs;
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 extern struct defaults_list defaults;
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-/*
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- * Alias sequence number to avoid loops.
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- */
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-extern unsigned int alias_seqno;
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-
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-/*
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- * Prototypes
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- */
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-char *alias_add(char *, int, struct member *);
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-bool addr_matches(char *);
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-int cmnd_matches(struct member *);
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-int cmndlist_matches(struct member_list *);
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-bool command_matches(char *, char *);
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-int hostlist_matches(struct member_list *);
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-bool hostname_matches(char *, char *, char *);
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-bool netgr_matches(char *, char *, char *, char *);
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+/* alias.c */
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 bool no_aliases(void);
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-int runaslist_matches(struct member_list *, struct member_list *, struct member **, struct member **);
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-int userlist_matches(struct passwd *, struct member_list *);
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-bool usergr_matches(char *, char *, struct passwd *);
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-bool userpw_matches(char *, char *, struct passwd *);
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-bool group_matches(char *, struct group *);
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-struct alias *alias_find(char *, int);
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-struct alias *alias_remove(char *, int);
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-void alias_free(void *);
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-void alias_apply(int (*)(void *, void *), void *);
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+char *alias_add(char *name, int type, struct member *members);
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+int alias_compare(const void *a1, const void *a2);
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+struct alias *alias_get(char *name, int type);
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+struct alias *alias_remove(char *name, int type);
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+void alias_apply(int (*func)(void *, void *), void *cookie);
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+void alias_free(void *a);
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+void alias_put(struct alias *a);
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 void init_aliases(void);
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-void init_lexer(void);
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+/* gram.c */
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 void init_parser(const char *, bool);
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-int alias_compare(const void *, const void *);
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+
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+/* match_addr.c */
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+bool addr_matches(char *n);
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+
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+/* match.c */
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+bool command_matches(char *sudoers_cmnd, char *sudoers_args);
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+bool group_matches(char *sudoers_group, struct group *gr);
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+bool hostname_matches(char *shost, char *lhost, char *pattern);
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+bool netgr_matches(char *netgr, char *lhost, char *shost, char *user);
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+bool usergr_matches(char *group, char *user, struct passwd *pw);
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+bool userpw_matches(char *sudoers_user, char *user, struct passwd *pw);
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+int cmnd_matches(struct member *m);
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+int cmndlist_matches(struct member_list *list);
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+int hostlist_matches(struct member_list *list);
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+int runaslist_matches(struct member_list *user_list, struct member_list *group_list, struct member **matching_user, struct member **matching_group);
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+int userlist_matches(struct passwd *pw, struct member_list *list);
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+
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+/* toke.c */
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+ void init_lexer(void);
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+
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+/* base64.c */
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+ size_t base64_decode(const char *str, unsigned char *dst, size_t dsize);
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 #endif /* _SUDO_PARSE_H */
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diff -up sudo-1.8.6p3/plugins/sudoers/visudo.c.cycledetect sudo-1.8.6p3/plugins/sudoers/visudo.c
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--- sudo-1.8.6p3/plugins/sudoers/visudo.c.cycledetect	2013-08-09 10:52:04.759860779 +0200
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+++ sudo-1.8.6p3/plugins/sudoers/visudo.c	2013-08-09 10:52:04.786860910 +0200
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@@ -1084,7 +1084,6 @@ alias_remove_recursive(char *name, int t
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 	}
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 	rbinsert(alias_freelist, a);
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     }
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-    alias_seqno++;
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     debug_return_bool(rval);
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 }
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@@ -1096,12 +1095,13 @@ check_alias(char *name, int type, int st
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     int errors = 0;
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     debug_decl(check_alias, SUDO_DEBUG_ALIAS)
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-    if ((a = alias_find(name, type)) != NULL) {
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+    if ((a = alias_get(name, type)) != NULL) {
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 	/* check alias contents */
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 	tq_foreach_fwd(&a->members, m) {
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 	    if (m->type == ALIAS)
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 		errors += check_alias(m->name, type, strict, quiet);
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 	}
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+	alias_put(a);
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     } else {
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 	if (!quiet) {
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 	    char *fmt;
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@@ -1146,26 +1146,22 @@ check_aliases(bool strict, bool quiet)
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     tq_foreach_fwd(&userspecs, us) {
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 	tq_foreach_fwd(&us->users, m) {
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 	    if (m->type == ALIAS) {
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-		alias_seqno++;
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 		errors += check_alias(m->name, USERALIAS, strict, quiet);
1b092f
 	    }
1b092f
 	}
1b092f
 	tq_foreach_fwd(&us->privileges, priv) {
1b092f
 	    tq_foreach_fwd(&priv->hostlist, m) {
1b092f
 		if (m->type == ALIAS) {
1b092f
-		    alias_seqno++;
1b092f
 		    errors += check_alias(m->name, HOSTALIAS, strict, quiet);
1b092f
 		}
1b092f
 	    }
1b092f
 	    tq_foreach_fwd(&priv->cmndlist, cs) {
1b092f
 		tq_foreach_fwd(&cs->runasuserlist, m) {
1b092f
 		    if (m->type == ALIAS) {
1b092f
-			alias_seqno++;
1b092f
 			errors += check_alias(m->name, RUNASALIAS, strict, quiet);
1b092f
 		    }
1b092f
 		}
1b092f
 		if ((m = cs->cmnd)->type == ALIAS) {
1b092f
-		    alias_seqno++;
1b092f
 		    errors += check_alias(m->name, CMNDALIAS, strict, quiet);
1b092f
 		}
1b092f
 	    }
1b092f
@@ -1176,7 +1172,6 @@ check_aliases(bool strict, bool quiet)
1b092f
     tq_foreach_fwd(&userspecs, us) {
1b092f
 	tq_foreach_fwd(&us->users, m) {
1b092f
 	    if (m->type == ALIAS) {
1b092f
-		alias_seqno++;
1b092f
 		if (!alias_remove_recursive(m->name, USERALIAS))
1b092f
 		    errors++;
1b092f
 	    }
1b092f
@@ -1184,7 +1179,6 @@ check_aliases(bool strict, bool quiet)
1b092f
 	tq_foreach_fwd(&us->privileges, priv) {
1b092f
 	    tq_foreach_fwd(&priv->hostlist, m) {
1b092f
 		if (m->type == ALIAS) {
1b092f
-		    alias_seqno++;
1b092f
 		    if (!alias_remove_recursive(m->name, HOSTALIAS))
1b092f
 			errors++;
1b092f
 		}
1b092f
@@ -1192,13 +1186,11 @@ check_aliases(bool strict, bool quiet)
1b092f
 	    tq_foreach_fwd(&priv->cmndlist, cs) {
1b092f
 		tq_foreach_fwd(&cs->runasuserlist, m) {
1b092f
 		    if (m->type == ALIAS) {
1b092f
-			alias_seqno++;
1b092f
 			if (!alias_remove_recursive(m->name, RUNASALIAS))
1b092f
 			    errors++;
1b092f
 		    }
1b092f
 		}
1b092f
 		if ((m = cs->cmnd)->type == ALIAS) {
1b092f
-		    alias_seqno++;
1b092f
 		    if (!alias_remove_recursive(m->name, CMNDALIAS))
1b092f
 			errors++;
1b092f
 		}
1b092f
@@ -1225,7 +1217,6 @@ check_aliases(bool strict, bool quiet)
1b092f
 	tq_foreach_fwd(&d->binding, binding) {
1b092f
 	    for (m = binding; m != NULL; m = m->next) {
1b092f
 		if (m->type == ALIAS) {
1b092f
-		    alias_seqno++;
1b092f
 		    if (!alias_remove_recursive(m->name, atype))
1b092f
 			errors++;
1b092f
 		}