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759da3b915
large commit. I thought this was worthwhile to get done for consistency. (This used to be commit ec32b22ed5ec224f6324f5e069d15e92e38e15c0)
70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/*
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Unix SMB/CIFS implementation.
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gain/lose root privileges
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Copyright (C) Andrew Tridgell 2004
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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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#include "system/passwd.h"
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/*
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there are times when smbd needs to temporarily gain root privileges
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to do some operation. To do this you call root_privileges(), which
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returns a talloc handle. To restore your previous privileges
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talloc_free() this pointer.
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Note that this call is considered successful even if it does not
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manage to gain too privileges, but it will call smb_abort() if it
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fails to restore the privileges afterwards. The logic is that
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failing to gain root access can be caught by whatever operation
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needs to be run as root failing, but failing to lose the root
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privileges is dangerous.
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This also means that this code is safe to be called from completely
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unprivileged processes.
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*/
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struct saved_state {
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uid_t uid;
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};
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static int privileges_destructor(void *ptr)
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{
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struct saved_state *s = ptr;
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if (geteuid() != s->uid &&
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seteuid(s->uid) != 0) {
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smb_panic("Failed to restore privileges");
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}
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return 0;
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}
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void *root_privileges(void)
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{
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struct saved_state *s;
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s = talloc(NULL, struct saved_state);
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if (!s) return NULL;
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s->uid = geteuid();
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if (s->uid != 0) {
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seteuid(0);
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}
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talloc_set_destructor(s, privileges_destructor);
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return s;
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}
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