Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 377 insertions, 0 deletions

diff --git a/plugins/sudoers/alias.c b/plugins/sudoers/alias.c
new file mode 100644
index 0000000..d435400
--- /dev/null
+++ b/plugins/sudoers/alias.c
@@ -0,0 +1,377 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2004-2005, 2007-2019
+ *	Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "sudoers.h"
+#include "redblack.h"
+#include <gram.h>
+
+/*
+ * Comparison function for the red-black tree.
+ * Aliases are sorted by name with the type used as a tie-breaker.
+ */
+static int
+alias_compare(const void *v1, const void *v2)
+{
+    const struct alias *a1 = (const struct alias *)v1;
+    const struct alias *a2 = (const struct alias *)v2;
+    int res;
+    debug_decl(alias_compare, SUDOERS_DEBUG_ALIAS);
+
+    if (a1 == NULL)
+	res = -1;
+    else if (a2 == NULL)
+	res = 1;
+    else if ((res = strcmp(a1->name, a2->name)) == 0)
+	res = a1->type - a2->type;
+    debug_return_int(res);
+}
+
+/*
+ * Search the tree for an alias with the specified name and type.
+ * Returns a pointer to the alias structure or NULL if not found.
+ * Caller is responsible for calling alias_put() on the returned
+ * alias to mark it as unused.
+ */
+struct alias *
+alias_get(struct sudoers_parse_tree *parse_tree, const char *name, int type)
+{
+    struct alias key;
+    struct rbnode *node;
+    struct alias *a = NULL;
+    debug_decl(alias_get, SUDOERS_DEBUG_ALIAS);
+
+    if (parse_tree->aliases == NULL)
+	debug_return_ptr(NULL);
+
+    key.name = (char *)name;
+    key.type = type;
+    if ((node = rbfind(parse_tree->aliases, &key)) != NULL) {
+	/*
+	 * Check whether this alias is already in use.
+	 * If so, we've detected a loop.  If not, set the flag,
+	 * which the caller should clear with a call to alias_put().
+	 */
+	a = node->data;
+	if (a->used) {
+	    errno = ELOOP;
+	    debug_return_ptr(NULL);
+	}
+	a->used = true;
+    } else {
+	errno = ENOENT;
+    }
+    debug_return_ptr(a);
+}
+
+/*
+ * Clear the "used" flag in an alias once the caller is done with it.
+ */
+void
+alias_put(struct alias *a)
+{
+    debug_decl(alias_put, SUDOERS_DEBUG_ALIAS);
+    a->used = false;
+    debug_return;
+}
+
+/*
+ * Add an alias to the aliases redblack tree.
+ * Note that "file" must be a reference-counted string.
+ * Returns true on success and false on failure, setting errno.
+ */
+bool
+alias_add(struct sudoers_parse_tree *parse_tree, char *name, int type,
+    char *file, int line, int column, struct member *members)
+{
+    struct alias *a;
+    debug_decl(alias_add, SUDOERS_DEBUG_ALIAS);
+
+    if (parse_tree->aliases == NULL) {
+	if ((parse_tree->aliases = alloc_aliases()) == NULL)
+	    debug_return_bool(false);
+    }
+
+    a = calloc(1, sizeof(*a));
+    if (a == NULL)
+	debug_return_bool(false);
+
+    /* Only set elements used by alias_compare() in case there is a dupe. */
+    a->name = name;
+    a->type = type;
+    switch (rbinsert(parse_tree->aliases, a, NULL)) {
+    case 1:
+	free(a);
+	errno = EEXIST;
+	debug_return_bool(false);
+    case -1:
+	free(a);
+	debug_return_bool(false);
+    }
+
+    /*
+     * It is now safe to fill in the rest of the alias.  We do this last
+     * since it modifies "file" (adds a ref) and "members" (tailq conversion).
+     */
+    /* a->used = false; */
+    a->file = sudo_rcstr_addref(file);
+    a->line = line;
+    a->column = column;
+    HLTQ_TO_TAILQ(&a->members, members, entries);
+    debug_return_bool(true);
+}
+
+/*
+ * Closure to adapt 2-arg rbapply() to 3-arg alias_apply().
+ */
+struct alias_apply_closure {
+    struct sudoers_parse_tree *parse_tree;
+    int (*func)(struct sudoers_parse_tree *, struct alias *, void *);
+    void *cookie;
+};
+
+/* Adapt rbapply() to alias_apply() calling convention. */
+static int
+alias_apply_func(void *v1, void *v2)
+{
+    struct alias *a = v1;
+    struct alias_apply_closure *closure = v2;
+
+    return closure->func(closure->parse_tree, a, closure->cookie);
+}
+
+/*
+ * Apply a function to each alias entry and pass in a cookie.
+ */
+void
+alias_apply(struct sudoers_parse_tree *parse_tree,
+    int (*func)(struct sudoers_parse_tree *, struct alias *, void *),
+    void *cookie)
+{
+    struct alias_apply_closure closure;
+    debug_decl(alias_apply, SUDOERS_DEBUG_ALIAS);
+
+    if (parse_tree->aliases != NULL) {
+	closure.parse_tree = parse_tree;
+	closure.func = func;
+	closure.cookie = cookie;
+	rbapply(parse_tree->aliases, alias_apply_func, &closure, inorder);
+    }
+
+    debug_return;
+}
+
+/*
+ * Returns true if there are no aliases in the parse_tree, else false.
+ */
+bool
+no_aliases(struct sudoers_parse_tree *parse_tree)
+{
+    debug_decl(no_aliases, SUDOERS_DEBUG_ALIAS);
+    debug_return_bool(parse_tree->aliases == NULL ||
+	rbisempty(parse_tree->aliases));
+}
+
+/*
+ * Free memory used by an alias struct and its members.
+ */
+void
+alias_free(void *v)
+{
+    struct alias *a = (struct alias *)v;
+    debug_decl(alias_free, SUDOERS_DEBUG_ALIAS);
+
+    if (a != NULL) {
+	free(a->name);
+	sudo_rcstr_delref(a->file);
+	free_members(&a->members);
+	free(a);
+    }
+
+    debug_return;
+}
+
+/*
+ * Find the named alias, remove it from the tree and return it.
+ */
+struct alias *
+alias_remove(struct sudoers_parse_tree *parse_tree, const char *name, int type)
+{
+    struct rbnode *node;
+    struct alias key;
+    debug_decl(alias_remove, SUDOERS_DEBUG_ALIAS);
+
+    if (parse_tree->aliases != NULL) {
+	key.name = (char *)name;
+	key.type = type;
+	if ((node = rbfind(parse_tree->aliases, &key)) != NULL)
+	    debug_return_ptr(rbdelete(parse_tree->aliases, node));
+    }
+    errno = ENOENT;
+    debug_return_ptr(NULL);
+}
+
+struct rbtree *
+alloc_aliases(void)
+{
+    debug_decl(alloc_aliases, SUDOERS_DEBUG_ALIAS);
+
+    debug_return_ptr(rbcreate(alias_compare));
+}
+
+void
+free_aliases(struct rbtree *aliases)
+{
+    debug_decl(free_aliases, SUDOERS_DEBUG_ALIAS);
+
+    if (aliases != NULL)
+	rbdestroy(aliases, alias_free);
+}
+
+const char *
+alias_type_to_string(int alias_type)
+{
+    return alias_type == HOSTALIAS ? "Host_Alias" :
+	alias_type == CMNDALIAS ? "Cmnd_Alias" :
+	alias_type == USERALIAS ? "User_Alias" :
+	alias_type == RUNASALIAS ? "Runas_Alias" :
+	"Invalid_Alias";
+}
+
+/*
+ * Remove the alias of the specified type as well as any other aliases
+ * referenced by that alias.  Stores removed aliases in a freelist.
+ */
+static bool
+alias_remove_recursive(struct sudoers_parse_tree *parse_tree, char *name,
+    int type, struct rbtree *freelist)
+{
+    struct member *m;
+    struct alias *a;
+    bool ret = true;
+    debug_decl(alias_remove_recursive, SUDOERS_DEBUG_ALIAS);
+
+    if ((a = alias_remove(parse_tree, name, type)) != NULL) {
+	TAILQ_FOREACH(m, &a->members, entries) {
+	    if (m->type == ALIAS) {
+		if (!alias_remove_recursive(parse_tree, m->name, type, freelist))
+		    ret = false;
+	    }
+	}
+	if (rbinsert(freelist, a, NULL) != 0)
+	    ret = false;
+    }
+    debug_return_bool(ret);
+}
+
+static int
+alias_find_used_members(struct sudoers_parse_tree *parse_tree,
+    struct member_list *members, int atype, struct rbtree *used_aliases)
+{
+    struct member *m;
+    int errors = 0;
+    debug_decl(alias_find_used_members, SUDOERS_DEBUG_ALIAS);
+
+    if (members != NULL) {
+	TAILQ_FOREACH(m, members, entries) {
+	    if (m->type != ALIAS)
+		continue;
+	    if (!alias_remove_recursive(parse_tree, m->name, atype, used_aliases))
+		errors++;
+	}
+    }
+
+    debug_return_int(errors);
+}
+
+/*
+ * Move all aliases referenced by userspecs to used_aliases.
+ */
+bool
+alias_find_used(struct sudoers_parse_tree *parse_tree, struct rbtree *used_aliases)
+{
+    struct privilege *priv;
+    struct userspec *us;
+    struct cmndspec *cs;
+    struct defaults *d;
+    struct member *m;
+    int errors = 0;
+    debug_decl(alias_find_used, SUDOERS_DEBUG_ALIAS);
+
+    /* Move referenced aliases to used_aliases. */
+    TAILQ_FOREACH(us, &parse_tree->userspecs, entries) {
+	errors += alias_find_used_members(parse_tree, &us->users,
+	    USERALIAS, used_aliases);
+	TAILQ_FOREACH(priv, &us->privileges, entries) {
+	    errors += alias_find_used_members(parse_tree, &priv->hostlist,
+		HOSTALIAS, used_aliases);
+	    TAILQ_FOREACH(cs, &priv->cmndlist, entries) {
+		errors += alias_find_used_members(parse_tree, cs->runasuserlist,
+		    RUNASALIAS, used_aliases);
+		errors += alias_find_used_members(parse_tree, cs->runasgrouplist,
+		    RUNASALIAS, used_aliases);
+		if ((m = cs->cmnd)->type == ALIAS) {
+		    if (!alias_remove_recursive(parse_tree, m->name, CMNDALIAS,
+			used_aliases))
+			errors++;
+		}
+	    }
+	}
+    }
+    TAILQ_FOREACH(d, &parse_tree->defaults, entries) {
+	switch (d->type) {
+	    case DEFAULTS_HOST:
+		errors += alias_find_used_members(parse_tree,
+		    &d->binding->members, HOSTALIAS, used_aliases);
+		break;
+	    case DEFAULTS_USER:
+		errors += alias_find_used_members(parse_tree,
+		    &d->binding->members, USERALIAS, used_aliases);
+		break;
+	    case DEFAULTS_RUNAS:
+		errors += alias_find_used_members(parse_tree,
+		    &d->binding->members, RUNASALIAS, used_aliases);
+		break;
+	    case DEFAULTS_CMND:
+		errors += alias_find_used_members(parse_tree,
+		    &d->binding->members, CMNDALIAS, used_aliases);
+		break;
+	    default:
+		break;
+	}
+    }
+
+    debug_return_int(errors ? false : true);
+}