474 lines
13 KiB
C
474 lines
13 KiB
C
/*-
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* Copyright (c) 2009-2015 Juan Romero Pardines.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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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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#include <stdio.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <dirent.h>
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#include <libgen.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "xbps_api_impl.h"
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static bool
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check_remove_pkg_files(struct xbps_handle *xhp,
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xbps_dictionary_t pkgd, const char *pkgver, uid_t euid)
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{
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struct stat st;
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xbps_array_t array;
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xbps_object_iterator_t iter;
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xbps_object_t obj;
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const char *objs[] = { "files", "conf_files", "links", "dirs" };
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const char *file;
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char path[PATH_MAX];
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bool fail = false;
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for (uint8_t i = 0; i < __arraycount(objs); i++) {
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array = xbps_dictionary_get(pkgd, objs[i]);
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if (array == NULL || xbps_array_count(array) == 0)
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continue;
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iter = xbps_array_iter_from_dict(pkgd, objs[i]);
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if (iter == NULL)
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continue;
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while ((obj = xbps_object_iterator_next(iter))) {
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xbps_dictionary_get_cstring_nocopy(obj, "file", &file);
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snprintf(path, sizeof(path), "%s/%s", xhp->rootdir, file);
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/*
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* Check if effective user ID owns the file; this is
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* enough to ensure the user has write permissions
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* on the directory.
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*/
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if (euid == 0 || (!lstat(path, &st) && euid == st.st_uid)) {
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/* success */
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continue;
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}
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if (errno != ENOENT) {
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/*
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* only bail out if something else than ENOENT
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* is returned.
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*/
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int rv = errno;
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if (rv == 0) {
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/* lstat succeeds but euid != uid */
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rv = EPERM;
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}
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fail = true;
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE_FAIL,
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rv, pkgver,
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"%s: cannot remove `%s': %s",
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pkgver, file, strerror(rv));
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}
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errno = 0;
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}
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xbps_object_iterator_release(iter);
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}
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return fail;
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}
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struct order_length_t {
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unsigned int pos;
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size_t len;
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};
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static int cmp_order_length(const void *l1, const void *l2) {
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size_t a = ((const struct order_length_t*)l1)->len;
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size_t b = ((const struct order_length_t*)l2)->len;
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return (a < b) - (b < a);
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}
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static int
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remove_pkg_files(struct xbps_handle *xhp,
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xbps_dictionary_t dict,
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const char *key,
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const char *pkgver)
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{
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xbps_array_t array, dirs;
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xbps_object_iterator_t iter;
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xbps_object_t obj;
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const char *curobj = NULL;
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/* These are symlinks in Void and must not be removed */
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const char *basesymlinks[] = {
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"/bin",
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"/sbin",
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"/usr/sbin",
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"/lib",
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"/lib32",
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"/lib64",
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"/usr/lib32",
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"/usr/lib64",
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"/var/run",
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};
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int rv = 0;
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assert(xbps_object_type(dict) == XBPS_TYPE_DICTIONARY);
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assert(key != NULL);
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array = xbps_dictionary_get(dict, key);
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if (xbps_array_count(array) == 0)
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return 0;
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iter = xbps_array_iter_from_dict(dict, key);
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if (iter == NULL)
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return ENOMEM;
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if (strcmp(key, "files") == 0)
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curobj = "file";
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else if (strcmp(key, "conf_files") == 0)
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curobj = "configuration file";
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else if (strcmp(key, "links") == 0)
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curobj = "link";
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else if (strcmp(key, "dirs") == 0)
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curobj = "directory";
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xbps_object_iterator_reset(iter);
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/*
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* directories must be ordered before removal
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*/
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if (strcmp(key, "dirs") == 0) {
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unsigned int i = 0;
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unsigned int n = xbps_array_count(array);
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struct order_length_t *lengths =
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(struct order_length_t*) malloc(sizeof(struct order_length_t) * n);
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if (lengths == NULL)
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return ENOMEM;
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while ((obj = xbps_object_iterator_next(iter))) {
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const char *file;
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xbps_dictionary_get_cstring_nocopy(obj, "file", &file);
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lengths[i].len = strlen(file);
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lengths[i].pos = i;
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i++;
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}
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qsort(lengths, n, sizeof(struct order_length_t), cmp_order_length);
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dirs = xbps_array_create_with_capacity(n);
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for (i = 0; i < n; i++) {
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xbps_array_add(dirs, xbps_array_get(array, lengths[i].pos));
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}
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xbps_object_iterator_release(iter);
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iter = xbps_array_iterator(dirs);
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free(lengths);
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}
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xbps_object_iterator_reset(iter);
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while ((obj = xbps_object_iterator_next(iter))) {
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const char *file, *sha256;
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char path[PATH_MAX];
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bool found;
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xbps_dictionary_get_cstring_nocopy(obj, "file", &file);
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if (strcmp(xhp->rootdir, "/") == 0)
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snprintf(path, sizeof(path), "%s", file);
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else
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snprintf(path, sizeof(path), "%s%s", xhp->rootdir, file);
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if ((strcmp(key, "files") == 0) ||
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(strcmp(key, "conf_files") == 0)) {
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/*
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* Check SHA256 hash in regular files and
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* configuration files.
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*/
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xbps_dictionary_get_cstring_nocopy(obj,
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"sha256", &sha256);
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rv = xbps_file_hash_check(path, sha256);
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if (rv == ENOENT) {
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/* missing file, ignore it */
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xbps_set_cb_state(xhp,
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XBPS_STATE_REMOVE_FILE_HASH_FAIL,
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rv, pkgver,
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"%s: failed to check hash for %s `%s': %s",
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pkgver, curobj, file, strerror(rv));
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rv = 0;
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continue;
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} else if (rv == ERANGE) {
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rv = 0;
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if ((xhp->flags &
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XBPS_FLAG_FORCE_REMOVE_FILES) == 0) {
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xbps_set_cb_state(xhp,
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XBPS_STATE_REMOVE_FILE_HASH_FAIL,
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0, pkgver,
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"%s: %s `%s' SHA256 mismatch, "
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"preserving file", pkgver,
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curobj, file);
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continue;
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} else {
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xbps_set_cb_state(xhp,
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XBPS_STATE_REMOVE_FILE_HASH_FAIL,
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0, pkgver,
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"%s: %s `%s' SHA256 mismatch, "
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"forcing removal", pkgver,
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curobj, file);
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}
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} else if (rv != 0 && rv != ERANGE) {
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xbps_set_cb_state(xhp,
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XBPS_STATE_REMOVE_FILE_HASH_FAIL,
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rv, pkgver,
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"%s: [remove] failed to check hash for "
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"%s `%s': %s", pkgver, curobj, file,
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strerror(rv));
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break;
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}
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}
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/*
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* Make sure to not remove any symlink of root directory.
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*/
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found = false;
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for (uint8_t i = 0; i < __arraycount(basesymlinks); i++) {
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if (strcmp(file, basesymlinks[i]) == 0) {
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found = true;
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xbps_dbg_printf(xhp, "[remove] %s ignoring "
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"%s removal\n", pkgver, file);
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break;
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}
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}
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if (found) {
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continue;
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}
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if (strcmp(key, "links") == 0) {
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const char *target = NULL;
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char *lnk;
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xbps_dictionary_get_cstring_nocopy(obj, "target", &target);
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assert(target);
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lnk = xbps_symlink_target(xhp, path, target);
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if (lnk == NULL) {
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xbps_dbg_printf(xhp, "[remove] %s "
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"symlink_target: %s\n", path, strerror(errno));
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continue;
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}
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if (strcmp(lnk, target)) {
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xbps_dbg_printf(xhp, "[remove] %s symlink "
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"modified (stored %s current %s)\n", path,
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target, lnk);
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if ((xhp->flags & XBPS_FLAG_FORCE_REMOVE_FILES) == 0) {
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free(lnk);
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continue;
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}
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}
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free(lnk);
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}
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/*
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* Remove the object if possible.
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*/
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if (remove(path) == -1) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE_FAIL,
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errno, pkgver,
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"%s: failed to remove %s `%s': %s", pkgver,
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curobj, file, strerror(errno));
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} else {
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/* success */
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE,
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0, pkgver, "Removed %s `%s'", curobj, file);
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}
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}
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xbps_object_iterator_release(iter);
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return rv;
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}
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int HIDDEN
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xbps_remove_pkg(struct xbps_handle *xhp, const char *pkgver, bool update)
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{
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xbps_dictionary_t pkgd = NULL, pkgfilesd = NULL;
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char *pkgname, metafile[PATH_MAX];
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int rv = 0;
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pkg_state_t state = 0;
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uid_t euid;
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assert(xhp);
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assert(pkgver);
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pkgname = xbps_pkg_name(pkgver);
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assert(pkgname);
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euid = geteuid();
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if ((pkgd = xbps_pkgdb_get_pkg(xhp, pkgname)) == NULL) {
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rv = errno;
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xbps_dbg_printf(xhp, "[remove] cannot find %s in pkgdb: %s\n",
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pkgver, strerror(rv));
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goto out;
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}
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if ((rv = xbps_pkg_state_dictionary(pkgd, &state)) != 0) {
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xbps_dbg_printf(xhp, "[remove] cannot find %s in pkgdb: %s\n",
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pkgver, strerror(rv));
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goto out;
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}
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xbps_dbg_printf(xhp, "attempting to remove %s state %d\n", pkgver, state);
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if (!update)
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE, 0, pkgver, NULL);
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if (chdir(xhp->rootdir) == -1) {
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rv = errno;
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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rv, pkgver,
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"%s: [remove] failed to chdir to rootdir `%s': %s",
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pkgver, xhp->rootdir, strerror(rv));
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goto out;
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}
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/* internalize pkg files dictionary from metadir */
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snprintf(metafile, sizeof(metafile), "%s/.%s-files.plist", xhp->metadir, pkgname);
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pkgfilesd = xbps_plist_dictionary_from_file(xhp, metafile);
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if (pkgfilesd == NULL)
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xbps_dbg_printf(xhp, "WARNING: metaplist for %s "
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"doesn't exist!\n", pkgver);
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/* If package was "half-removed", remove it fully. */
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if (state == XBPS_PKG_STATE_HALF_REMOVED)
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goto purge;
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/*
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* Run the pre remove action and show pre-remove message if exists.
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*/
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rv = xbps_pkg_exec_script(xhp, pkgd, "remove-script", "pre", update);
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if (rv != 0) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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errno, pkgver,
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"%s: [remove] REMOVE script failed to "
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"execute pre ACTION: %s",
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pkgver, strerror(rv));
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goto out;
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}
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/* show remove-msg if exists */
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if ((rv = xbps_cb_message(xhp, pkgd, "remove-msg")) != 0)
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goto out;
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/* unregister alternatives */
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if (update)
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xbps_dictionary_set_bool(pkgd, "alternatives-update", true);
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if ((rv = xbps_alternatives_unregister(xhp, pkgd)) != 0)
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goto out;
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/*
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* If updating a package, we just need to execute the current
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* pre-remove action target and we are done. Its files will be
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* overwritten later in unpack phase.
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*/
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if (update) {
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free(pkgname);
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return 0;
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}
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if (pkgfilesd) {
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/*
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* Do the removal in 2 phases:
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* 1- check if user has enough perms to remove all entries
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* 2- perform removal
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*/
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if (check_remove_pkg_files(xhp, pkgfilesd, pkgver, euid)) {
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rv = EPERM;
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goto out;
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}
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/* Remove links */
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if ((rv = remove_pkg_files(xhp, pkgfilesd, "links", pkgver)) != 0)
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goto out;
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/* Remove regular files */
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if ((rv = remove_pkg_files(xhp, pkgfilesd, "files", pkgver)) != 0)
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goto out;
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/* Remove configuration files */
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if ((rv = remove_pkg_files(xhp, pkgfilesd, "conf_files", pkgver)) != 0)
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goto out;
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/* Remove dirs */
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if ((rv = remove_pkg_files(xhp, pkgfilesd, "dirs", pkgver)) != 0)
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goto out;
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}
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/*
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* Execute the post REMOVE action if file exists and we aren't
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* updating the package.
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*/
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rv = xbps_pkg_exec_script(xhp, pkgd, "remove-script", "post", false);
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if (rv != 0) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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rv, pkgver,
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"%s: [remove] REMOVE script failed to execute "
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"post ACTION: %s", pkgver, strerror(rv));
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goto out;
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}
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/*
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* Set package state to "half-removed".
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*/
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rv = xbps_set_pkg_state_dictionary(pkgd,
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XBPS_PKG_STATE_HALF_REMOVED);
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if (rv != 0) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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rv, pkgver,
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"%s: [remove] failed to set state to half-removed: %s",
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pkgver, strerror(rv));
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goto out;
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}
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purge:
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/*
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* Execute the purge REMOVE action if file exists.
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*/
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rv = xbps_pkg_exec_script(xhp, pkgd, "remove-script", "purge", false);
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if (rv != 0) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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rv, pkgver,
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"%s: REMOVE script failed to execute "
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"purge ACTION: %s", pkgver, strerror(rv));
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goto out;
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}
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/*
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* Remove package metadata plist.
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*/
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if (remove(metafile) == -1) {
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if (errno != ENOENT) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
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rv, pkgver,
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"%s: failed to remove metadata file: %s",
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pkgver, strerror(errno));
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}
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}
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/*
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* Unregister package from pkgdb.
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*/
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xbps_dictionary_remove(xhp->pkgdb, pkgname);
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xbps_dbg_printf(xhp, "[remove] unregister %s returned %d\n", pkgver, rv);
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_DONE, 0, pkgver, NULL);
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out:
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if (pkgname != NULL)
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free(pkgname);
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if (rv != 0) {
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xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL, rv, pkgver,
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"%s: failed to remove package: %s", pkgver, strerror(rv));
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}
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return rv;
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}
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