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-rw-r--r--libpam/pam_modutil_priv.c170
1 files changed, 170 insertions, 0 deletions
diff --git a/libpam/pam_modutil_priv.c b/libpam/pam_modutil_priv.c
new file mode 100644
index 0000000..e22fab1
--- /dev/null
+++ b/libpam/pam_modutil_priv.c
@@ -0,0 +1,170 @@
+/*
+ * $Id$
+ *
+ * This file provides two functions:
+ * pam_modutil_drop_priv:
+ * temporarily lower process fs privileges by switching to another uid/gid,
+ * pam_modutil_regain_priv:
+ * regain process fs privileges lowered by pam_modutil_drop_priv().
+ */
+
+#include "pam_modutil_private.h"
+#include <security/pam_ext.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/fsuid.h>
+
+/*
+ * Two setfsuid() calls in a row are necessary to check
+ * whether setfsuid() succeeded or not.
+ */
+static int change_uid(uid_t uid, uid_t *save)
+{
+ uid_t tmp = setfsuid(uid);
+ if (save)
+ *save = tmp;
+ return (uid_t) setfsuid(uid) == uid ? 0 : -1;
+}
+static int change_gid(gid_t gid, gid_t *save)
+{
+ gid_t tmp = setfsgid(gid);
+ if (save)
+ *save = tmp;
+ return (gid_t) setfsgid(gid) == gid ? 0 : -1;
+}
+
+static int cleanup(struct pam_modutil_privs *p)
+{
+ if (p->allocated) {
+ p->allocated = 0;
+ free(p->grplist);
+ }
+ p->grplist = NULL;
+ p->number_of_groups = 0;
+ return -1;
+}
+
+#define PRIV_MAGIC 0x1004000a
+#define PRIV_MAGIC_DONOTHING 0xdead000a
+
+int pam_modutil_drop_priv(pam_handle_t *pamh,
+ struct pam_modutil_privs *p,
+ const struct passwd *pw)
+{
+ int res;
+
+ if (p->is_dropped) {
+ pam_syslog(pamh, LOG_CRIT,
+ "pam_modutil_drop_priv: called with dropped privileges");
+ return -1;
+ }
+
+ /*
+ * If not root, we can do nothing.
+ * If switching to root, we have nothing to do.
+ * That is, in both cases, we do not care.
+ */
+ if (geteuid() != 0 || pw->pw_uid == 0) {
+ p->is_dropped = PRIV_MAGIC_DONOTHING;
+ return 0;
+ }
+
+ if (!p->grplist || p->number_of_groups <= 0) {
+ pam_syslog(pamh, LOG_CRIT,
+ "pam_modutil_drop_priv: called without room for supplementary groups");
+ return -1;
+ }
+ res = getgroups(0, NULL);
+ if (res < 0) {
+ pam_syslog(pamh, LOG_ERR,
+ "pam_modutil_drop_priv: getgroups failed: %m");
+ return -1;
+ }
+
+ p->allocated = 0;
+ if (res > p->number_of_groups) {
+ p->grplist = calloc(res, sizeof(gid_t));
+ if (!p->grplist) {
+ pam_syslog(pamh, LOG_CRIT, "out of memory");
+ return cleanup(p);
+ }
+ p->allocated = 1;
+ p->number_of_groups = res;
+ }
+
+ res = getgroups(p->number_of_groups, p->grplist);
+ if (res < 0) {
+ pam_syslog(pamh, LOG_ERR,
+ "pam_modutil_drop_priv: getgroups failed: %m");
+ return cleanup(p);
+ }
+
+ p->number_of_groups = res;
+
+ /*
+ * We should care to leave process credentials in consistent state.
+ * That is, e.g. if change_gid() succeeded but change_uid() failed,
+ * we should try to restore old gid.
+ */
+ if (setgroups(0, NULL)) {
+ pam_syslog(pamh, LOG_ERR,
+ "pam_modutil_drop_priv: setgroups failed: %m");
+ return cleanup(p);
+ }
+ if (change_gid(pw->pw_gid, &p->old_gid)) {
+ pam_syslog(pamh, LOG_ERR,
+ "pam_modutil_drop_priv: change_gid failed: %m");
+ (void) setgroups(p->number_of_groups, p->grplist);
+ return cleanup(p);
+ }
+ if (change_uid(pw->pw_uid, &p->old_uid)) {
+ pam_syslog(pamh, LOG_ERR,
+ "pam_modutil_drop_priv: change_uid failed: %m");
+ (void) change_gid(p->old_gid, NULL);
+ (void) setgroups(p->number_of_groups, p->grplist);
+ return cleanup(p);
+ }
+
+ p->is_dropped = PRIV_MAGIC;
+ return 0;
+}
+
+int pam_modutil_regain_priv(pam_handle_t *pamh,
+ struct pam_modutil_privs *p)
+{
+ switch (p->is_dropped) {
+ case PRIV_MAGIC_DONOTHING:
+ p->is_dropped = 0;
+ return 0;
+
+ case PRIV_MAGIC:
+ break;
+
+ default:
+ pam_syslog(pamh, LOG_CRIT,
+ "pam_modutil_regain_priv: called with invalid state");
+ return -1;
+ }
+
+ if (change_uid(p->old_uid, NULL)) {
+ pam_syslog(pamh, LOG_ERR,
+ "pam_modutil_regain_priv: change_uid failed: %m");
+ return cleanup(p);
+ }
+ if (change_gid(p->old_gid, NULL)) {
+ pam_syslog(pamh, LOG_ERR,
+ "pam_modutil_regain_priv: change_gid failed: %m");
+ return cleanup(p);
+ }
+ if (setgroups(p->number_of_groups, p->grplist)) {
+ pam_syslog(pamh, LOG_ERR,
+ "pam_modutil_regain_priv: setgroups failed: %m");
+ return cleanup(p);
+ }
+
+ p->is_dropped = 0;
+ cleanup(p);
+ return 0;
+}