1 files changed, 145 insertions, 0 deletions
diff --git a/libmisc/pam_pass_non_interactive.c b/libmisc/pam_pass_non_interactive.c
new file mode 100644
index 0000000..34cdc1f
--- /dev/null
+++ b/libmisc/pam_pass_non_interactive.c
@@ -0,0 +1,145 @@
+/*
+ * SPDX-FileCopyrightText: 2009 - 2010, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id:$"
+
+#ifdef USE_PAM
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <security/pam_appl.h>
+#include "prototypes.h"
+#include "shadowlog.h"
+
+/*@null@*/ /*@only@*/static const char *non_interactive_password = NULL;
+static int ni_conv (int num_msg,
+                    const struct pam_message **msg,
+                    struct pam_response **resp,
+                    unused void *appdata_ptr);
+static const struct pam_conv non_interactive_pam_conv = {
+	ni_conv,
+	NULL
+};
+
+
+
+static int ni_conv (int num_msg,
+                    const struct pam_message **msg,
+                    struct pam_response **resp,
+                    unused void *appdata_ptr)
+{
+	struct pam_response *responses;
+	int count;
+
+	assert (NULL != non_interactive_password);
+
+	if (num_msg <= 0) {
+		return PAM_CONV_ERR;
+	}
+
+	responses = (struct pam_response *) calloc ((size_t) num_msg,
+	                                            sizeof (*responses));
+	if (NULL == responses) {
+		return PAM_CONV_ERR;
+	}
+
+	for (count=0; count < num_msg; count++) {
+		responses[count].resp_retcode = 0;
+
+		switch (msg[count]->msg_style) {
+		case PAM_PROMPT_ECHO_ON:
+			fprintf (log_get_logfd(),
+			         _("%s: PAM modules requesting echoing are not supported.\n"),
+			         log_get_progname());
+			goto failed_conversation;
+		case PAM_PROMPT_ECHO_OFF:
+			responses[count].resp = strdup (non_interactive_password);
+			if (NULL == responses[count].resp) {
+				goto failed_conversation;
+			}
+			break;
+		case PAM_ERROR_MSG:
+			if (   (NULL == msg[count]->msg)
+			    || (fprintf (log_get_logfd(), "%s\n", msg[count]->msg) <0)) {
+				goto failed_conversation;
+			}
+			responses[count].resp = NULL;
+			break;
+		case PAM_TEXT_INFO:
+			if (   (NULL == msg[count]->msg)
+			    || (fprintf (stdout, "%s\n", msg[count]->msg) <0)) {
+				goto failed_conversation;
+			}
+			responses[count].resp = NULL;
+			break;
+		default:
+			(void) fprintf (log_get_logfd(),
+			                _("%s: conversation type %d not supported.\n"),
+			                log_get_progname(), msg[count]->msg_style);
+			goto failed_conversation;
+		}
+	}
+
+	*resp = responses;
+
+	return PAM_SUCCESS;
+
+failed_conversation:
+	for (count=0; count < num_msg; count++) {
+		if (NULL != responses[count].resp) {
+			memset (responses[count].resp, 0,
+			        strlen (responses[count].resp));
+			free (responses[count].resp);
+			responses[count].resp = NULL;
+		}
+	}
+
+	free (responses);
+	*resp = NULL;
+
+	return PAM_CONV_ERR;
+}
+
+
+/*
+ * Change non interactively the user's password using PAM.
+ *
+ * Return 0 on success, 1 on failure.
+ */
+int do_pam_passwd_non_interactive (const char *pam_service,
+                                    const char *username,
+                                    const char* password)
+{
+	pam_handle_t *pamh = NULL;
+	int ret;
+
+	ret = pam_start (pam_service, username, &non_interactive_pam_conv, &pamh);
+	if (ret != PAM_SUCCESS) {
+		fprintf (log_get_logfd(),
+		         _("%s: (user %s) pam_start failure %d\n"),
+		         log_get_progname(), username, ret);
+		return 1;
+	}
+
+	non_interactive_password = password;
+	ret = pam_chauthtok (pamh, 0);
+	if (ret != PAM_SUCCESS) {
+		fprintf (log_get_logfd(),
+		         _("%s: (user %s) pam_chauthtok() failed, error:\n"
+		           "%s\n"),
+		         log_get_progname(), username, pam_strerror (pamh, ret));
+	}
+
+	(void) pam_end (pamh, PAM_SUCCESS);
+
+	return ((PAM_SUCCESS == ret) ? 0 : 1);
+}
+#else				/* !USE_PAM */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
+#endif				/* !USE_PAM */