Relevant BUGIDs: none

Purpose of commit: new feature

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

Add PAM extensions pam_*prompt, pam_*error and pam_*info for usage
by modules to libpam, add new pam_ext.h header file with prototypes.

1 files changed, 106 insertions, 0 deletions

diff --git a/libpam/pam_vprompt.c b/libpam/pam_vprompt.c
new file mode 100644
index 00000000..e680ceb7
--- /dev/null
+++ b/libpam/pam_vprompt.c
@@ -0,0 +1,106 @@
+/*
+ * 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"
+
+int PAM_FORMAT((printf, 4, 0)) PAM_NONNULL((4))
+pam_vprompt (pam_handle_t *pamh, int style, char **response,
+	     const char *fmt, va_list args)
+{
+  struct pam_message msg;
+  struct pam_response *pam_resp = NULL;
+  const struct pam_message *pmsg;
+  const struct pam_conv *conv;
+  const void *convp;
+  char *msgbuf;
+  int retval;
+
+  if (response)
+    *response = NULL;
+
+  retval = pam_get_item (pamh, PAM_CONV, &convp);
+  if (retval != PAM_SUCCESS)
+    return retval;
+  conv = convp;
+  if (conv == NULL || conv->conv == NULL)
+    {
+      _pam_system_log (LOG_ERR, "no conversation function");
+      return PAM_SYSTEM_ERR;
+    }
+
+  if (vasprintf (&msgbuf, fmt, args) < 0)
+    {
+      _pam_system_log (LOG_ERR, "vasprintf: %m");
+      return PAM_BUF_ERR;
+    }
+
+  msg.msg_style = style;
+  msg.msg = msgbuf;
+  pmsg = &msg;
+
+  retval = conv->conv (1, &pmsg, &pam_resp, conv->appdata_ptr);
+  if (response)
+    *response = pam_resp == NULL ? NULL : pam_resp->resp;
+  _pam_overwrite (msgbuf);
+  free (msgbuf);
+  if (retval != PAM_SUCCESS)
+    _pam_system_log (LOG_ERR, "conversation failed");
+
+  return retval;
+}
+
+int PAM_FORMAT((printf, 4, 0)) PAM_NONNULL((4))
+pam_prompt (pam_handle_t *pamh, int style, char **response,
+	    const char *fmt, ...)
+{
+  va_list args;
+  int retval;
+
+  va_start (args, fmt);
+  retval = pam_vprompt (pamh, style, response, fmt, args);
+  va_end (args);
+
+  return retval;
+}