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If a set of saved credentials already exists when we are called, log 

a debugging message and fail.

If the effective uid is non-zero but identical to the target uid,
save the current credentials and return without doing anything else.


git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@201 185d5e19-27fe-0310-9dcf-9bff6b9f3609
This commit is contained in:
Dag-Erling Smørgrav 2003-02-07 16:04:39 +00:00
parent a657d3746c
commit 4ad428dc12
1 changed files with 14 additions and 3 deletions
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17
lib/openpam_borrow_cred.c
View File

@ -31,7 +31,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $P4: //depot/projects/openpam/lib/openpam_borrow_cred.c#3 $
* $P4: //depot/projects/openpam/lib/openpam_borrow_cred.c#4 $
*/
#include <sys/param.h>
@ -57,9 +57,18 @@ openpam_borrow_cred(pam_handle_t *pamh,
struct pam_saved_cred *scred;
int r;
ENTER();
if (geteuid() != 0)
ENTERI(pwd->pw_uid);
r = pam_get_data(pamh, PAM_SAVED_CRED, (const void **)&scred);
if (r == PAM_SUCCESS && scred != NULL) {
openpam_log(PAM_LOG_DEBUG,
"already operating under borrowed credentials");
RETURNC(PAM_SYSTEM_ERR);
}
if (geteuid() != 0 && geteuid() != pwd->pw_uid) {
openpam_log(PAM_LOG_DEBUG, "called with non-zero euid: %d",
(int)geteuid());
RETURNC(PAM_PERM_DENIED);
}
scred = calloc(1, sizeof *scred);
if (scred == NULL)
RETURNC(PAM_BUF_ERR);
@ -76,6 +85,8 @@ openpam_borrow_cred(pam_handle_t *pamh,
free(scred);
RETURNC(r);
}
if (geteuid() == pwd->pw_uid)
RETURNC(PAM_SUCCESS);
if (initgroups(pwd->pw_name, pwd->pw_gid) == -1 ||
setegid(pwd->pw_gid) == -1 || seteuid(pwd->pw_uid) == -1) {
openpam_restore_cred(pamh);