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- (bal) Fixed uidswap.c so it should work on non-posix complient systems.
patch based on 2.5.2 version by djm.
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@ -1,3 +1,7 @@
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20010427
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- (bal) Fixed uidswap.c so it should work on non-posix complient systems.
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patch based on 2.5.2 version by djm.
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20010425
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- OpenBSD CVS Sync
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- markus@cvs.openbsd.org 2001/04/23 21:57:07
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@ -5252,4 +5256,4 @@
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- Wrote replacements for strlcpy and mkdtemp
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- Released 1.0pre1
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$Id: ChangeLog,v 1.1171 2001/04/26 04:40:28 tim Exp $
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$Id: ChangeLog,v 1.1172 2001/04/26 23:03:37 mouring Exp $
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47
uidswap.c
47
uidswap.c
@ -26,14 +26,18 @@ RCSID("$OpenBSD: uidswap.c,v 1.16 2001/04/20 16:32:22 markus Exp $");
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* POSIX saved uids or not.
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*/
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#if defined(_POSIX_SAVED_IDS) && !defined(BROKEN_SAVED_UIDS)
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/* Lets assume that posix saved ids also work with seteuid, even though that
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is not part of the posix specification. */
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#define SAVED_IDS_WORK_WITH_SETEUID
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/* Saved effective uid. */
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static uid_t saved_euid = 0;
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static gid_t saved_egid = 0;
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#endif
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/* Saved effective uid. */
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static int privileged = 0;
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static int temporarily_use_uid_effective = 0;
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static uid_t saved_euid = 0;
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static gid_t saved_egid;
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static gid_t saved_egroups[NGROUPS_MAX], user_groups[NGROUPS_MAX];
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static int saved_egroupslen = -1, user_groupslen = -1;
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@ -45,16 +49,24 @@ void
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temporarily_use_uid(struct passwd *pw)
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{
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/* Save the current euid, and egroups. */
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#ifdef SAVED_IDS_WORK_WITH_SETEUID
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saved_euid = geteuid();
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saved_egid = getegid();
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debug("temporarily_use_uid: %d/%d (e=%d)",
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pw->pw_uid, pw->pw_gid, saved_euid);
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if (saved_euid != 0) {
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privileged = 0;
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return;
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}
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#else
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if (geteuid() != 0) {
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privileged = 0;
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return;
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}
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#endif /* SAVED_IDS_WORK_WITH_SETEUID */
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privileged = 1;
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temporarily_use_uid_effective = 1;
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saved_egid = getegid();
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saved_egroupslen = getgroups(NGROUPS_MAX, saved_egroups);
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if (saved_egroupslen < 0)
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fatal("getgroups: %.100s", strerror(errno));
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@ -71,7 +83,14 @@ temporarily_use_uid(struct passwd *pw)
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/* Set the effective uid to the given (unprivileged) uid. */
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if (setgroups(user_groupslen, user_groups) < 0)
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fatal("setgroups: %.100s", strerror(errno));
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pw->pw_gid = pw->pw_gid;
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#ifndef SAVED_IDS_WORK_WITH_SETEUID
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/* Propagate the privileged gid to all of our gids. */
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if (setgid(getegid()) < 0)
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debug("setgid %u: %.100s", (u_int) getegid(), strerror(errno));
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/* Propagate the privileged uid to all of our uids. */
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if (setuid(geteuid()) < 0)
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debug("setuid %u: %.100s", (u_int) geteuid(), strerror(errno));
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#endif /* SAVED_IDS_WORK_WITH_SETEUID */
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if (setegid(pw->pw_gid) < 0)
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fatal("setegid %u: %.100s", (u_int) pw->pw_gid,
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strerror(errno));
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@ -92,13 +111,27 @@ restore_uid(void)
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return;
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if (!temporarily_use_uid_effective)
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fatal("restore_uid: temporarily_use_uid not effective");
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#ifdef SAVED_IDS_WORK_WITH_SETEUID
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/* Set the effective uid back to the saved privileged uid. */
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if (seteuid(saved_euid) < 0)
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fatal("seteuid %u: %.100s", (u_int) saved_euid, strerror(errno));
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fatal("seteuid %u: %.100s", (u_int) saved_euid,
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strerror(errno));
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if (setegid(saved_egid) < 0)
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fatal("setegid %u: %.100s", (u_int) saved_egid,
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strerror(errno));
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#else /* SAVED_IDS_WORK_WITH_SETEUID */
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/*
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* We are unable to restore the real uid to its unprivileged value.
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* Propagate the real uid (usually more privileged) to effective uid
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* as well.
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*/
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setuid(getuid());
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setgid(getgid());
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#endif /* SAVED_IDS_WORK_WITH_SETEUID */
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if (setgroups(saved_egroupslen, saved_egroups) < 0)
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fatal("setgroups: %.100s", strerror(errno));
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if (setegid(saved_egid) < 0)
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fatal("setegid %u: %.100s", (u_int) saved_egid, strerror(errno));
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temporarily_use_uid_effective = 0;
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}
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