76 lines
1.7 KiB
Diff
76 lines
1.7 KiB
Diff
On systems without 'setfsuid', use 'setreuid' instead.
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The patch originates from the Debian project for GNU/Hurd.
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Authors: Steve Langasek <vorlon@debian.org>
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Upstream status: A ticket was opened to request apply the patch,
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ticket: 'https://fedorahosted.org/linux-pam/ticket/64'.
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--- Linux-PAM-1.2.1/libpam/pam_modutil_priv.c 2015-03-24 06:02:32.000000000 -0600
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+++ pam_modutil_priv-mod.c 2016-09-20 13:36:53.150663205 -0500
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@@ -14,7 +14,9 @@
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#include <syslog.h>
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#include <pwd.h>
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#include <grp.h>
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+#ifdef HAVE_SYS_FSUID_H
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#include <sys/fsuid.h>
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+#endif /* HAVE_SYS_FSUID_H */
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/*
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* Two setfsuid() calls in a row are necessary to check
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@@ -22,17 +24,55 @@
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*/
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static int change_uid(uid_t uid, uid_t *save)
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{
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+#ifdef HAVE_SYS_FSUID_H
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uid_t tmp = setfsuid(uid);
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if (save)
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*save = tmp;
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return (uid_t) setfsuid(uid) == uid ? 0 : -1;
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+#else
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+ uid_t euid = geteuid();
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+ uid_t ruid = getuid();
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+ if (save)
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+ *save = ruid;
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+ if (ruid == uid && uid != 0)
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+ if (setreuid(euid, uid))
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+ return -1;
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+ else {
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+ setreuid(0, -1);
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+ if (setreuid(-1, uid)) {
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+ setreuid(-1, 0);
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+ setreuid(0, -1);
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+ if (setreuid(-1, uid))
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+ return -1;
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+ }
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+ }
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+#endif
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}
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static int change_gid(gid_t gid, gid_t *save)
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{
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+#ifdef HAVE_SYS_FSUID_H
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gid_t tmp = setfsgid(gid);
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if (save)
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*save = tmp;
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return (gid_t) setfsgid(gid) == gid ? 0 : -1;
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+#else
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+ gid_t egid = getegid();
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+ gid_t rgid = getgid();
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+ if (save)
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+ *save = rgid;
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+ if (rgid == gid)
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+ if (setregid(egid, gid))
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+ return -1;
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+ else {
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+ setregid(0, -1);
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+ if (setregid(-1, gid)) {
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+ setregid(-1, 0);
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+ setregid(0, -1);
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+ if (setregid(-1, gid))
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+ return -1;
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+ }
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+ }
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+#endif
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}
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static int cleanup(struct pam_modutil_privs *p)
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