| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364 | #!/usr/bin/python3'''Copyright (c) 2013-2015 Phusion Holding B.V.Permission is hereby granted, free of charge, to any person obtaining a copyof this software and associated documentation files (the "Software"), to dealin the Software without restriction, including without limitation the rightsto use, copy, modify, merge, publish, distribute, sublicense, and/or sellcopies of the Software, and to permit persons to whom the Software isfurnished to do so, subject to the following conditions:The above copyright notice and this permission notice shall be included inall copies or substantial portions of the Software.THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS ORIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THEAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHERLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS INTHE SOFTWARE.'''import sysimport osimport pwddef abort(message):    sys.stderr.write("setuser: %s\n" % message)    sys.exit(1)def main():    '''    A simple alternative to sudo that executes a command as a user by setting    the user ID and user parameters to those described by the system and then    using execvp(3) to execute the command without the necessity of a TTY    '''    username = sys.argv[1]    try:        user = pwd.getpwnam(username)    except KeyError:        abort("user %s not found" % username)    os.initgroups(username, user.pw_gid)    os.setgid(user.pw_gid)    os.setuid(user.pw_uid)    os.environ['USER'] = username    os.environ['HOME'] = user.pw_dir    os.environ['UID'] = str(user.pw_uid)    try:        os.execvp(sys.argv[2], sys.argv[2:])    except OSError as e:        abort("cannot execute %s: %s" % (sys.argv[2], str(e)))if __name__ == '__main__':    if len(sys.argv) < 3:        sys.stderr.write("Usage: /sbin/setuser USERNAME COMMAND [args..]\n")        sys.exit(1)    main()
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