Project import
diff --git a/su/Android.mk b/su/Android.mk new file mode 100644 index 0000000..297e0a3 --- /dev/null +++ b/su/Android.mk
@@ -0,0 +1,13 @@ +LOCAL_PATH:= $(call my-dir) +include $(CLEAR_VARS) + +LOCAL_CFLAGS := -std=c11 -Wall -Werror + +LOCAL_SRC_FILES:= su.c + +LOCAL_MODULE:= su + +LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES) +LOCAL_MODULE_TAGS := debug + +include $(BUILD_EXECUTABLE)
diff --git a/su/MODULE_LICENSE_APACHE2 b/su/MODULE_LICENSE_APACHE2 new file mode 100644 index 0000000..e69de29 --- /dev/null +++ b/su/MODULE_LICENSE_APACHE2
diff --git a/su/NOTICE b/su/NOTICE new file mode 100644 index 0000000..c5b1efa --- /dev/null +++ b/su/NOTICE
@@ -0,0 +1,190 @@ + + 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. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. 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For the purposes + of this License, Derivative Works shall not include works that remain + separable from, or merely link (or bind by name) to the interfaces of, + the Work and Derivative Works thereof. + + "Contribution" shall mean any work of authorship, including + the original version of the Work and any modifications or additions + to that Work or Derivative Works thereof, that is intentionally + submitted to Licensor for inclusion in the Work by the copyright owner + or by an individual or Legal Entity authorized to submit on behalf of + the copyright owner. For the purposes of this definition, "submitted" + means any form of electronic, verbal, or written communication sent + to the Licensor or its representatives, including but not limited to + communication on electronic mailing lists, source code control systems, + and issue tracking systems that are managed by, or on behalf of, the + Licensor for the purpose of discussing and improving the Work, but + excluding communication that is conspicuously marked or otherwise + designated in writing by the copyright owner as "Not a Contribution." + + "Contributor" shall mean Licensor and any individual or Legal Entity + on behalf of whom a Contribution has been received by Licensor and + subsequently incorporated within the Work. + + 2. Grant of Copyright License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + copyright license to reproduce, prepare Derivative Works of, + publicly display, publicly perform, sublicense, and distribute the + Work and such Derivative Works in Source or Object form. + + 3. Grant of Patent License. Subject to the terms and conditions of + this License, each Contributor hereby grants to You a perpetual, + worldwide, non-exclusive, no-charge, royalty-free, irrevocable + (except as stated in this section) patent license to make, have made, + use, offer to sell, sell, import, and otherwise transfer the Work, + where such license applies only to those patent claims licensable + by such Contributor that are necessarily infringed by their + Contribution(s) alone or by combination of their Contribution(s) + with the Work to which such Contribution(s) was submitted. If You + institute patent litigation against any entity (including a + cross-claim or counterclaim in a lawsuit) alleging that the Work + or a Contribution incorporated within the Work constitutes direct + or contributory patent infringement, then any patent licenses + granted to You under this License for that Work shall terminate + as of the date such litigation is filed. + + 4. Redistribution. You may reproduce and distribute copies of the + Work or Derivative Works thereof in any medium, with or without + modifications, and in Source or Object form, provided that You + meet the following conditions: + + (a) You must give any other recipients of the Work or + Derivative Works a copy of this License; and + + (b) You must cause any modified files to carry prominent notices + stating that You changed the files; and + + (c) You must retain, in the Source form of any Derivative Works + that You distribute, all copyright, patent, trademark, and + attribution notices from the Source form of the Work, + excluding those notices that do not pertain to any part of + the Derivative Works; and + + (d) If the Work includes a "NOTICE" text file as part of its + distribution, then any Derivative Works that You distribute must + include a readable copy of the attribution notices contained + within such NOTICE file, excluding those notices that do not + pertain to any part of the Derivative Works, in at least one + of the following places: within a NOTICE text file distributed + as part of the Derivative Works; within the Source form or + documentation, if provided along with the Derivative Works; or, + within a display generated by the Derivative Works, if and + wherever such third-party notices normally appear. The contents + of the NOTICE file are for informational purposes only and + do not modify the License. You may add Your own attribution + notices within Derivative Works that You distribute, alongside + or as an addendum to the NOTICE text from the Work, provided + that such additional attribution notices cannot be construed + as modifying the License. + + You may add Your own copyright statement to Your modifications and + may provide additional or different license terms and conditions + for use, reproduction, or distribution of Your modifications, or + for any such Derivative Works as a whole, provided Your use, + reproduction, and distribution of the Work otherwise complies with + the conditions stated in this License. + + 5. Submission of Contributions. Unless You explicitly state otherwise, + any Contribution intentionally submitted for inclusion in the Work + by You to the Licensor shall be under the terms and conditions of + this License, without any additional terms or conditions. + Notwithstanding the above, nothing herein shall supersede or modify + the terms of any separate license agreement you may have executed + with Licensor regarding such Contributions. + + 6. Trademarks. This License does not grant permission to use the trade + names, trademarks, service marks, or product names of the Licensor, + except as required for reasonable and customary use in describing the + origin of the Work and reproducing the content of the NOTICE file. + + 7. Disclaimer of Warranty. Unless required by applicable law or + agreed to in writing, Licensor provides the Work (and each + Contributor provides its Contributions) on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied, including, without limitation, any warranties or conditions + of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A + PARTICULAR PURPOSE. You are solely responsible for determining the + appropriateness of using or redistributing the Work and assume any + risks associated with Your exercise of permissions under this License. + + 8. Limitation of Liability. In no event and under no legal theory, + whether in tort (including negligence), contract, or otherwise, + unless required by applicable law (such as deliberate and grossly + negligent acts) or agreed to in writing, shall any Contributor be + liable to You for damages, including any direct, indirect, special, + incidental, or consequential damages of any character arising as a + result of this License or out of the use or inability to use the + Work (including but not limited to damages for loss of goodwill, + work stoppage, computer failure or malfunction, or any and all + other commercial damages or losses), even if such Contributor + has been advised of the possibility of such damages. + + 9. Accepting Warranty or Additional Liability. While redistributing + the Work or Derivative Works thereof, You may choose to offer, + and charge a fee for, acceptance of support, warranty, indemnity, + or other liability obligations and/or rights consistent with this + License. However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + + END OF TERMS AND CONDITIONS +
diff --git a/su/su.c b/su/su.c new file mode 100644 index 0000000..ea61f93 --- /dev/null +++ b/su/su.c
@@ -0,0 +1,145 @@ +/* + * 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]); +}