Scott Kitterman
53 lines
1.7 KiB
Python
53 lines
1.7 KiB
Python
# drop_priviledges (from https://github.com/nigelb/Static-UPnP)
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# Copyright (C) 2016 NigelB
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# Copyright (C) 2018 Scott Kitterman
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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def drop_privileges(milterconfig):
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import os
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import grp
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import pwd
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import syslog
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import dkim
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if os.getuid() != 0:
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if milterconfig.get('Syslog'):
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syslog.syslog('drop_privileges: Not running as root. Cannot drop permissions.')
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return
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# Figure out if user and group are specified
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userstr = milterconfig.get('UserID')
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userlist = userstr.split(':')
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if len(userlist) == 1:
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gidname = userlist[0]
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else:
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gidname = userlist[1]
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uidname = userlist[0]
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# Get the uid/gid from the name
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running_uid = pwd.getpwnam(uidname).pw_uid
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running_gid = grp.getgrnam(gidname).gr_gid
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# Remove group privileges
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os.setgroups([])
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# Try setting the new uid/gid
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os.setgid(running_gid)
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os.setuid(running_uid)
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# Set umask
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old_umask = os.umask(milterconfig.get('UMask'))
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