Hello Ludovic,
> 2010/9/20 Andre Zepezauer <andre.zepeza...@student.uni-halle.de>:
> > Hello,
> >
> > today I had to configure a host with pam_pkcs11. Doing that, I was
> > forced to edit the files in /etc/pam.d/ to get the debug messages of
> > pam_pkcs11. The corresponding option in the configuration file doesn't
> > have any effects. The attached patch fixes this unexpected behaviour.
>
> Fixed in revision 448.
> Thanks.
There is another issue with the output of debug messages. It is that the
users pin will be log by default. This can only be disabled at
compilation time. I assume that there will be always some systems where
debug is enabled. This is not a recommended practise, but could be
happen accidentally of course.
In my opinion, logging the users pin brings no real benefits, but can
cause serious harm to some operators. Therefore I would recommend to
drop this feature. Corresponding patch is attached.
The second patch improves error handling and removes the attempt to
clear a string of length zero. Which is in all cases a nop.
Regards
Andre
Index: src/pam_pkcs11/pam_pkcs11.c
===================================================================
--- src/pam_pkcs11/pam_pkcs11.c (revision 448)
+++ src/pam_pkcs11/pam_pkcs11.c (working copy)
@@ -449,9 +449,6 @@
"pam_get_pwd() failed: %s", pam_strerror(pamh, rv));
return pkcs11_pam_fail;
}
-#ifndef DEBUG_HIDE_PASSWORD
- DBG1("password = [%s]", password);
-#endif
/* check password length */
if (!configuration->nullok && strlen(password) == 0) {
Index: src/common/pkcs11_lib.c
===================================================================
--- src/common/pkcs11_lib.c (revision 448)
+++ src/common/pkcs11_lib.c (working copy)
@@ -44,9 +44,6 @@
/* get password */
pin =getpass("PIN for token: ");
-#ifndef DEBUG_HIDE_PASSWORD
- DBG1("PIN = [%s]", pin);
-#endif
/* for safety reasons, clean PIN string from memory asap */
/* check password length */
Index: src/common/pkcs11_lib.c
===================================================================
--- src/common/pkcs11_lib.c (revision 448)
+++ src/common/pkcs11_lib.c (working copy)
@@ -47,11 +47,13 @@
#ifndef DEBUG_HIDE_PASSWORD
DBG1("PIN = [%s]", pin);
#endif
- /* for safety reasons, clean PIN string from memory asap */
+ if (pin == NULL) {
+ set_error("Error encountered while reading PIN");
+ return -1;
+ }
/* check password length */
if (!nullok && strlen(pin) == 0) {
- memset(pin, 0, strlen(pin));
free(pin);
set_error("Empty passwords not allowed");
return -1;
@@ -62,7 +64,7 @@
memset(pin, 0, strlen(pin));
free(pin);
if (rv != 0) {
- /* DBG1("pkcs11_login() failed: %s", get_error()); */
+ set_error("pkcs11_login() failed: %s", get_error());
return -1;
}
return 0;
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