| 1 | /* Copyright (C) 1993-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <hurd.h> |
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| 19 | #include <hurd/id.h> |
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| 20 | |
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| 21 | /* Set the uid set for the current user to UIDS (N of them). */ |
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| 22 | int |
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| 23 | seteuids (int n, const uid_t *uids) |
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| 24 | { |
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| 25 | error_t err; |
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| 26 | auth_t newauth; |
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| 27 | int i; |
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| 28 | gid_t new[n]; |
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| 29 | |
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| 30 | /* Fault before taking locks. */ |
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| 31 | for (i = 0; i < n; ++i) |
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| 32 | new[i] = uids[i]; |
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| 33 | |
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| 34 | retry: |
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| 35 | HURD_CRITICAL_BEGIN; |
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| 36 | __mutex_lock (&_hurd_id.lock); |
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| 37 | err = _hurd_check_ids (); |
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| 38 | if (! err) |
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| 39 | { |
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| 40 | /* Get a new auth port using those IDs. */ |
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| 41 | err = __USEPORT (AUTH, |
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| 42 | __auth_makeauth (port, NULL, 0, 0, |
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| 43 | new, n, |
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| 44 | _hurd_id.aux.uids, _hurd_id.aux.nuids, |
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| 45 | _hurd_id.gen.gids, _hurd_id.gen.ngids, |
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| 46 | _hurd_id.aux.gids, _hurd_id.aux.ngids, |
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| 47 | &newauth)); |
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| 48 | } |
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| 49 | __mutex_unlock (&_hurd_id.lock); |
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| 50 | HURD_CRITICAL_END; |
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| 51 | if (err == EINTR) |
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| 52 | /* Got a signal while inside an RPC of the critical section, retry again */ |
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| 53 | goto retry; |
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| 54 | |
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| 55 | if (err) |
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| 56 | return __hurd_fail (err); |
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| 57 | |
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| 58 | /* Install the new auth port and reauthenticate everything. */ |
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| 59 | err = __setauth (newauth); |
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| 60 | __mach_port_deallocate (__mach_task_self (), newauth); |
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| 61 | return err; |
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| 62 | } |
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| 63 | |
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