File pam_unix-login.defs.diff of Package pam
Use hash from /etc/login.defs as default if no
other one is specified as argument.
* modules/pam_unix/support.c: Add search_key, call from __set_ctrl
* modules/pam_unix/support.h: Add define for /etc/login.defs
* modules/pam_unix/pam_unix.8.xml: Document new behavior.
* modules/pam_umask/pam_umask.c: Add missing NULL pointer check
diff --git a/modules/pam_umask/pam_umask.c b/modules/pam_umask/pam_umask.c
index 6d2ec1a..863f038 100644
--- a/modules/pam_umask/pam_umask.c
+++ b/modules/pam_umask/pam_umask.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2005, 2006, 2007, 2010 Thorsten Kukuk <kukuk@thkukuk.de>
+ * Copyright (c) 2005, 2006, 2007, 2010, 2013 Thorsten Kukuk <kukuk@thkukuk.de>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -112,6 +112,10 @@ search_key (const char *filename)
{
buflen = BUF_SIZE;
buf = malloc (buflen);
+ if (buf == NULL) {
+ fclose (fp);
+ return NULL;
+ }
}
buf[0] = '\0';
if (fgets (buf, buflen - 1, fp) == NULL)
diff --git a/modules/pam_unix/pam_unix.8.xml b/modules/pam_unix/pam_unix.8.xml
index 0a42d7a..9ce084e 100644
--- a/modules/pam_unix/pam_unix.8.xml
+++ b/modules/pam_unix/pam_unix.8.xml
@@ -81,7 +81,9 @@
<para>
The password component of this module performs the task of updating
- the user's password.
+ the user's password. The default encryption hash is taken from the
+ <emphasis remap='B'>ENCRYPT_METHOD</emphasis> variable from
+ <emphasis>/etc/login.defs</emphasis>
</para>
<para>
@@ -393,6 +395,9 @@ session required pam_unix.so
<title>SEE ALSO</title>
<para>
<citerefentry>
+ <refentrytitle>login.defs</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
<refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
diff --git a/modules/pam_unix/support.c b/modules/pam_unix/support.c
index ab04535..527c380 100644
--- a/modules/pam_unix/support.c
+++ b/modules/pam_unix/support.c
@@ -37,6 +37,80 @@
#define SELINUX_ENABLED 0
#endif
+static char *
+search_key (const char *filename)
+{
+ FILE *fp;
+ char *buf = NULL;
+ size_t buflen = 0;
+ char *retval = NULL;
+
+ fp = fopen (filename, "r");
+ if (NULL == fp)
+ return NULL;
+
+ while (!feof (fp))
+ {
+ char *tmp, *cp;
+#if defined(HAVE_GETLINE)
+ ssize_t n = getline (&buf, &buflen, fp);
+#elif defined (HAVE_GETDELIM)
+ ssize_t n = getdelim (&buf, &buflen, '\n', fp);
+#else
+ ssize_t n;
+
+ if (buf == NULL)
+ {
+ buflen = BUF_SIZE;
+ buf = malloc (buflen);
+ if (buf == NULL) {
+ fclose (fp);
+ return NULL;
+ }
+ }
+ buf[0] = '\0';
+ if (fgets (buf, buflen - 1, fp) == NULL)
+ break;
+ else if (buf != NULL)
+ n = strlen (buf);
+ else
+ n = 0;
+#endif /* HAVE_GETLINE / HAVE_GETDELIM */
+ cp = buf;
+
+ if (n < 1)
+ break;
+
+ tmp = strchr (cp, '#'); /* remove comments */
+ if (tmp)
+ *tmp = '\0';
+ while (isspace ((int)*cp)) /* remove spaces and tabs */
+ ++cp;
+ if (*cp == '\0') /* ignore empty lines */
+ continue;
+
+ if (cp[strlen (cp) - 1] == '\n')
+ cp[strlen (cp) - 1] = '\0';
+
+ tmp = strsep (&cp, " \t=");
+ if (cp != NULL)
+ while (isspace ((int)*cp) || *cp == '=')
+ ++cp;
+
+ if (strcasecmp (tmp, "ENCRYPT_METHOD") == 0)
+ {
+ retval = strdup (cp);
+ break;
+ }
+ }
+ fclose (fp);
+
+ free (buf);
+
+ return retval;
+}
+
+
/* this is a front-end for module-application conversations */
int _make_remark(pam_handle_t * pamh, unsigned int ctrl,
@@ -58,6 +132,8 @@ int _set_ctrl(pam_handle_t *pamh, int flags, int *remember, int *rounds,
int *pass_min_len, int argc, const char **argv)
{
unsigned int ctrl;
+ char *val;
+ int j;
D(("called."));
@@ -81,10 +157,28 @@ int _set_ctrl(pam_handle_t *pamh, int flags, int *remember, int *rounds,
D(("SILENT"));
set(UNIX__QUIET, ctrl);
}
+
+ /* preset encryption method with value from /etc/login.defs */
+ val = search_key (LOGIN_DEFS);
+ if (val) {
+ for (j = 0; j < UNIX_CTRLS_; ++j) {
+ if (unix_args[j].token
+ && !strncasecmp(val, unix_args[j].token, strlen(unix_args[j].token))) {
+ break;
+ }
+ }
+ if (j >= UNIX_CTRLS_) {
+ pam_syslog(pamh, LOG_WARNING, "unrecognized ENCRYPT_METHOD value [%s]", val);
+ } else {
+ ctrl &= unix_args[j].mask; /* for turning things off */
+ ctrl |= unix_args[j].flag; /* for turning things on */
+ }
+ free (val);
+ }
+
/* now parse the arguments to this module */
for (; argc-- > 0; ++argv) {
- int j;
D(("pam_unix arg: %s", *argv));
diff --git a/modules/pam_unix/support.h b/modules/pam_unix/support.h
index db4cd95..d21e349 100644
--- a/modules/pam_unix/support.h
+++ b/modules/pam_unix/support.h
@@ -8,6 +8,12 @@
#include <pwd.h>
/*
+ * File to read value of ENCRYPT_METHOD from.
+ */
+#define LOGIN_DEFS "/etc/login.defs"
+
+
+/*
* here is the string to inform the user that the new passwords they
* typed were not the same.
*/
