Relevant BUGIDs: none

Purpose of commit: new feature

Commit summary:
---------------

Add pam_syslog to unify log messages from PAM modules.

1 files changed, 118 insertions, 0 deletions

diff --git a/libpam/pam_syslog.c b/libpam/pam_syslog.c
new file mode 100644
index 00000000..53ab7e28
--- /dev/null
+++ b/libpam/pam_syslog.c
@@ -0,0 +1,118 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <errno.h>
+
+#include <security/pam_modules.h>
+#include <security/_pam_macros.h>
+#include <security/pam_ext.h>
+
+#include "pam_private.h"
+
+static const char *
+_pam_choice2str (int choice)
+{
+  switch (choice)
+    {
+    case PAM_AUTHENTICATE:
+      return "auth";
+    case PAM_SETCRED:
+      return "setcred";
+    case PAM_ACCOUNT:
+      return "account";
+    case PAM_OPEN_SESSION:
+    case PAM_CLOSE_SESSION:
+      return "session";
+    case PAM_CHAUTHTOK:
+      return "chauthtok";
+    }
+  return "";
+}
+
+void
+pam_vsyslog (pam_handle_t *pamh, int priority,
+	     const char *fmt, va_list args)
+{
+  char *msgbuf1 = NULL, *msgbuf2 = NULL;
+  int save_errno = errno;
+
+  if (pamh->mod_name)
+    {
+      if (asprintf (&msgbuf1, "%s(%s:%s):", pamh->mod_name,
+		    pamh->service_name?pamh->service_name:"<unknown>",
+		    _pam_choice2str (pamh->choice)) < 0)
+	{
+	  syslog (LOG_AUTHPRIV|LOG_ERR, "asprintf: %m");
+	  return;
+	}
+    }
+  else
+    {
+      msgbuf1 = strdup (_PAM_SYSTEM_LOG_PREFIX);
+      if (msgbuf1 == NULL)
+	{
+	  vsyslog (LOG_AUTHPRIV|priority, fmt, args);
+	  return;
+	}
+    }
+
+  if (vasprintf (&msgbuf2, fmt, args) < 0)
+    {
+      syslog (LOG_AUTHPRIV|LOG_ERR, "vasprintf: %m");
+      _pam_drop (msgbuf1);
+      return;
+    }
+
+  errno = save_errno;
+  syslog (LOG_AUTHPRIV|priority, "%s %s", msgbuf1, msgbuf2);
+
+  _pam_drop (msgbuf1);
+  _pam_drop (msgbuf2);
+}
+
+void
+pam_syslog (pam_handle_t *pamh, int priority,
+	    const char *fmt, ...)
+{
+  va_list args;
+
+  va_start (args, fmt);
+  pam_vsyslog (pamh, priority, fmt, args);
+  va_end (args);
+}