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