src/usr.bin/ssh/uidswap.c - diff

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Diff for /src/usr.bin/ssh/uidswap.c between version 1.6.2.4 and 1.7

version 1.6.2.4, 2001/03/21 18:53:19

version 1.7, 2000/06/20 01:39:45

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* Author: Tatu Ylonen <ylo@cs.hut.fi>

* Created: Sat Sep 9 01:56:14 1995 ylo

* Code for uid-swapping.

* As far as I am concerned, the code I have written for this software

* can be used freely for any purpose. Any derived versions of this

* software must be clearly marked as such, and if the derived work is

* incompatible with the protocol description in the RFC file, it must be

* called by a name other than "ssh" or "Secure Shell".

#include "includes.h"

RCSID("$OpenBSD$");

#include "log.h"

#include "ssh.h"

#include "uidswap.h"

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/* Lets assume that posix saved ids also work with seteuid, even though that

is not part of the posix specification. */

#define SAVED_IDS_WORK_WITH_SETEUID

#endif /* _POSIX_SAVED_IDS */

/* Saved effective uid. */

static uid_t saved_euid = 0;

#endif /* _POSIX_SAVED_IDS */

* Temporarily changes to the given uid. If the effective user

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/* Set the effective uid to the given (unprivileged) uid. */

if (seteuid(uid) == -1)

debug("seteuid %u: %.100s", (u_int) uid, strerror(errno));

debug("seteuid %d: %.100s", (int) uid, strerror(errno));

#else /* SAVED_IDS_WORK_WITH_SETEUID */

#else /* SAVED_IDS_WORK_WITH_SETUID */

/* Propagate the privileged uid to all of our uids. */

if (setuid(geteuid()) < 0)

debug("setuid %u: %.100s", (u_int) geteuid(), strerror(errno));

debug("setuid %d: %.100s", (int) geteuid(), strerror(errno));

/* Set the effective uid to the given (unprivileged) uid. */

if (seteuid(uid) == -1)

debug("seteuid %u: %.100s", (u_int) uid, strerror(errno));

debug("seteuid %d: %.100s", (int) uid, strerror(errno));

#endif /* SAVED_IDS_WORK_WITH_SETEUID */

}

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* Restores to the original uid.

void

restore_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 %u: %.100s", (u_int) saved_euid, strerror(errno));

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.

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permanently_set_uid(uid_t uid)

{

if (setuid(uid) < 0)

debug("setuid %u: %.100s", (u_int) uid, strerror(errno));

debug("setuid %d: %.100s", (int) uid, strerror(errno));

}