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-rw-r--r--libpam/pam_vprompt.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/libpam/pam_vprompt.c b/libpam/pam_vprompt.c
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+++ b/libpam/pam_vprompt.c
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+/*
+ * 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_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_syslog (pamh, LOG_ERR, "no conversation function");
+ return PAM_SYSTEM_ERR;
+ }
+
+ if (vasprintf (&msgbuf, fmt, args) < 0)
+ {
+ pam_syslog (pamh, 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 (retval != PAM_SUCCESS && pam_resp != NULL)
+ pam_syslog(pamh, LOG_WARNING,
+ "unexpected response from failed conversation function");
+ if (response)
+ *response = pam_resp == NULL ? NULL : pam_resp->resp;
+ else if (pam_resp && pam_resp->resp)
+ {
+ _pam_overwrite (pam_resp->resp);
+ _pam_drop (pam_resp->resp);
+ }
+ _pam_overwrite (msgbuf);
+ _pam_drop (pam_resp);
+ free (msgbuf);
+ if (retval != PAM_SUCCESS)
+ pam_syslog (pamh, LOG_ERR, "conversation failed");
+
+ return retval;
+}
+
+int
+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;
+}