+++ /dev/null
-
- Copyright (c) 2005-2008, The Android Open Source Project
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
-
-
- Apache License
- Version 2.0, January 2004
- http://www.apache.org/licenses/
-
- TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
-
- 1. Definitions.
-
- "License" shall mean the terms and conditions for use, reproduction,
- and distribution as defined by Sections 1 through 9 of this document.
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- the copyright owner that is granting the License.
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- END OF TERMS AND CONDITIONS
-
+++ /dev/null
-/*
- * Copyright (C) 2008 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <errno.h>
-#include <error.h>
-#include <getopt.h>
-#include <paths.h>
-#include <pwd.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <private/android_filesystem_config.h>
-
-void pwtoid(const char* tok, uid_t* uid, gid_t* gid) {
- struct passwd* pw = getpwnam(tok);
- if (pw) {
- if (uid) *uid = pw->pw_uid;
- if (gid) *gid = pw->pw_gid;
- } else {
- char* end;
- errno = 0;
- uid_t tmpid = strtoul(tok, &end, 10);
- if (errno != 0 || end == tok) error(1, errno, "invalid uid/gid '%s'", tok);
- if (uid) *uid = tmpid;
- if (gid) *gid = tmpid;
- }
-}
-
-void extract_uidgids(const char* uidgids, uid_t* uid, gid_t* gid, gid_t* gids, int* gids_count) {
- char *clobberablegids;
- char *nexttok;
- char *tok;
- int gids_found;
-
- if (!uidgids || !*uidgids) {
- *gid = *uid = 0;
- *gids_count = 0;
- return;
- }
-
- clobberablegids = strdup(uidgids);
- strcpy(clobberablegids, uidgids);
- nexttok = clobberablegids;
- tok = strsep(&nexttok, ",");
- pwtoid(tok, uid, gid);
- tok = strsep(&nexttok, ",");
- if (!tok) {
- /* gid is already set above */
- *gids_count = 0;
- free(clobberablegids);
- return;
- }
- pwtoid(tok, NULL, gid);
- gids_found = 0;
- while ((gids_found < *gids_count) && (tok = strsep(&nexttok, ","))) {
- pwtoid(tok, NULL, gids);
- gids_found++;
- gids++;
- }
- if (nexttok && gids_found == *gids_count) {
- fprintf(stderr, "too many group ids\n");
- }
- *gids_count = gids_found;
- free(clobberablegids);
-}
-
-int main(int argc, char** argv) {
- uid_t current_uid = getuid();
- if (current_uid != AID_ROOT && current_uid != AID_SHELL) error(1, 0, "not allowed");
-
- // Handle -h and --help.
- ++argv;
- if (*argv && (strcmp(*argv, "--help") == 0 || strcmp(*argv, "-h") == 0)) {
- fprintf(stderr,
- "usage: su [UID[,GID[,GID2]...]] [COMMAND [ARG...]]\n"
- "\n"
- "Switch to WHO (default 'root') and run the given command (default sh).\n"
- "\n"
- "where WHO is a comma-separated list of user, group,\n"
- "and supplementary groups in that order.\n"
- "\n");
- return 0;
- }
-
- // The default user is root.
- uid_t uid = 0;
- gid_t gid = 0;
-
- // If there are any arguments, the first argument is the uid/gid/supplementary groups.
- if (*argv) {
- gid_t gids[10];
- int gids_count = sizeof(gids)/sizeof(gids[0]);
- extract_uidgids(*argv, &uid, &gid, gids, &gids_count);
- if (gids_count) {
- if (setgroups(gids_count, gids)) {
- error(1, errno, "setgroups failed");
- }
- }
- ++argv;
- }
-
- if (setgid(gid)) error(1, errno, "setgid failed");
- if (setuid(uid)) error(1, errno, "setuid failed");
-
- // Reset parts of the environment.
- setenv("PATH", _PATH_DEFPATH, 1);
- unsetenv("IFS");
- struct passwd* pw = getpwuid(uid);
- if (pw) {
- setenv("LOGNAME", pw->pw_name, 1);
- setenv("USER", pw->pw_name, 1);
- } else {
- unsetenv("LOGNAME");
- unsetenv("USER");
- }
-
- // Set up the arguments for exec.
- char* exec_args[argc + 1]; // Having too much space is fine.
- size_t i = 0;
- for (; *argv != NULL; ++i) {
- exec_args[i] = *argv++;
- }
- // Default to the standard shell.
- if (i == 0) exec_args[i++] = "/system/bin/sh";
- exec_args[i] = NULL;
-
- execvp(exec_args[0], exec_args);
- error(1, errno, "failed to exec %s", exec_args[0]);
-}
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