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-rw-r--r--uidswap.c115
1 files changed, 53 insertions, 62 deletions
diff --git a/uidswap.c b/uidswap.c
index 0eb1fd08..72c2cc6e 100644
--- a/uidswap.c
+++ b/uidswap.c
@@ -1,32 +1,25 @@
/*
-
-uidswap.c
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
-
-Created: Sat Sep 9 01:56:14 1995 ylo
-
-Code for uid-swapping.
-
-*/
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ * Created: Sat Sep 9 01:56:14 1995 ylo
+ * Code for uid-swapping.
+ */
#include "includes.h"
-RCSID("$Id: uidswap.c,v 1.1 1999/10/27 03:42:46 damien Exp $");
+RCSID("$Id: uidswap.c,v 1.2 1999/11/24 13:26:23 damien Exp $");
#include "ssh.h"
#include "uidswap.h"
-/* Note: all these functions must work in all of the following cases:
-
- 1. euid=0, ruid=0
- 2. euid=0, ruid!=0
- 3. euid!=0, ruid!=0
-
- Additionally, they must work regardless of whether the system has
- POSIX saved uids or not. */
+/*
+ * Note: all these functions must work in all of the following cases:
+ * 1. euid=0, ruid=0
+ * 2. euid=0, ruid!=0
+ * 3. euid!=0, ruid!=0
+ * Additionally, they must work regardless of whether the system has
+ * POSIX saved uids or not.
+ */
#ifdef _POSIX_SAVED_IDS
/* Lets assume that posix saved ids also work with seteuid, even though that
@@ -37,59 +30,57 @@ RCSID("$Id: uidswap.c,v 1.1 1999/10/27 03:42:46 damien Exp $");
/* Saved effective uid. */
static uid_t saved_euid = 0;
-/* Temporarily changes to the given uid. If the effective user id is not
- root, this does nothing. This call cannot be nested. */
-
-void temporarily_use_uid(uid_t uid)
+/*
+ * Temporarily changes to the given uid. If the effective user
+ * id is not root, this does nothing. This call cannot be nested.
+ */
+void
+temporarily_use_uid(uid_t uid)
{
#ifdef SAVED_IDS_WORK_WITH_SETEUID
+ /* Save the current euid. */
+ saved_euid = geteuid();
- /* Save the current euid. */
- saved_euid = geteuid();
-
- /* Set the effective uid to the given (unprivileged) uid. */
- if (seteuid(uid) == -1)
- debug("seteuid %d: %.100s", (int)uid, strerror(errno));
-
+ /* Set the effective uid to the given (unprivileged) uid. */
+ if (seteuid(uid) == -1)
+ debug("seteuid %d: %.100s", (int) uid, strerror(errno));
#else /* SAVED_IDS_WORK_WITH_SETUID */
+ /* Propagate the privileged uid to all of our uids. */
+ if (setuid(geteuid()) < 0)
+ debug("setuid %d: %.100s", (int) geteuid(), strerror(errno));
- /* Propagate the privileged uid to all of our uids. */
- if (setuid(geteuid()) < 0)
- debug("setuid %d: %.100s", (int)geteuid(), strerror(errno));
-
- /* Set the effective uid to the given (unprivileged) uid. */
- if (seteuid(uid) == -1)
- debug("seteuid %d: %.100s", (int)uid, strerror(errno));
-
+ /* Set the effective uid to the given (unprivileged) uid. */
+ if (seteuid(uid) == -1)
+ debug("seteuid %d: %.100s", (int) uid, strerror(errno));
#endif /* SAVED_IDS_WORK_WITH_SETEUID */
-
}
-/* Restores to the original uid. */
-
-void restore_uid()
+/*
+ * Restores to the original uid.
+ */
+void
+restore_uid()
{
#ifdef SAVED_IDS_WORK_WITH_SETEUID
-
- /* Set the effective uid back to the saved uid. */
- if (seteuid(saved_euid) < 0)
- debug("seteuid %d: %.100s", (int)saved_euid, strerror(errno));
-
+ /* Set the effective uid back to the saved uid. */
+ if (seteuid(saved_euid) < 0)
+ debug("seteuid %d: %.100s", (int) saved_euid, strerror(errno));
#else /* SAVED_IDS_WORK_WITH_SETEUID */
-
- /* We are unable to restore the real uid to its unprivileged value. */
- /* Propagate the real uid (usually more privileged) to effective uid
- as well. */
- setuid(getuid());
-
+ /* We are unable to restore the real uid to its unprivileged
+ value. */
+ /* Propagate the real uid (usually more privileged) to effective
+ uid as well. */
+ setuid(getuid());
#endif /* SAVED_IDS_WORK_WITH_SETEUID */
}
-/* Permanently sets all uids to the given uid. This cannot be called while
- temporarily_use_uid is effective. */
-
-void permanently_set_uid(uid_t uid)
+/*
+ * Permanently sets all uids to the given uid. This cannot be
+ * called while temporarily_use_uid is effective.
+ */
+void
+permanently_set_uid(uid_t uid)
{
- if (setuid(uid) < 0)
- debug("setuid %d: %.100s", (int)uid, strerror(errno));
+ if (setuid(uid) < 0)
+ debug("setuid %d: %.100s", (int) uid, strerror(errno));
}