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Diffstat (limited to 'modules/pam_motd/pam_motd.c')
-rw-r--r--modules/pam_motd/pam_motd.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/modules/pam_motd/pam_motd.c b/modules/pam_motd/pam_motd.c
new file mode 100644
index 00000000..98976b66
--- /dev/null
+++ b/modules/pam_motd/pam_motd.c
@@ -0,0 +1,119 @@
+/* pam_motd module */
+
+/*
+ * Modified for pam_motd by Ben Collins <bcollins@debian.org>
+ *
+ * Based off of:
+ * $Id$
+ *
+ * Written by Michael K. Johnson <johnsonm@redhat.com> 1996/10/24
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <pwd.h>
+
+#include <security/_pam_macros.h>
+/*
+ * here, we make a definition for the externally accessible function
+ * in this file (this definition is required for static a module
+ * but strongly encouraged generally) it is used to instruct the
+ * modules include file to define the function prototypes.
+ */
+
+#define PAM_SM_SESSION
+#define DEFAULT_MOTD "/etc/motd"
+
+#include <security/pam_modules.h>
+
+/* --- session management functions (only) --- */
+
+PAM_EXTERN
+int pam_sm_close_session(pam_handle_t *pamh, int flags, int argc,
+ const char **argv)
+{
+ return PAM_IGNORE;
+}
+
+PAM_EXTERN
+int pam_sm_open_session(pam_handle_t *pamh, int flags, int argc,
+ const char **argv)
+{
+ int retval = PAM_IGNORE;
+ int fd;
+ char *mtmp=NULL, *motd_path=NULL;
+ struct pam_conv *conversation;
+ struct pam_message message;
+ struct pam_message *pmessage = &message;
+ struct pam_response *resp = NULL;
+ struct stat st;
+
+ if (flags & PAM_SILENT) {
+ return retval;
+ }
+
+ for (; argc-- > 0; ++argv) {
+ if (!strncmp(*argv,"motd=",5)) {
+ motd_path = (char *) strdup(5+*argv);
+ if (motd_path != NULL) {
+ D(("set motd path: %s", motd_path));
+ } else {
+ D(("failed to duplicate motd path - ignored"));
+ }
+ }
+ }
+
+ if (motd_path == NULL)
+ motd_path = DEFAULT_MOTD;
+
+ message.msg_style = PAM_TEXT_INFO;
+
+ if ((fd = open(motd_path, O_RDONLY, 0)) >= 0) {
+ /* fill in message buffer with contents of motd */
+ if ((fstat(fd, &st) < 0) || !st.st_size)
+ return retval;
+ message.msg = mtmp = malloc(st.st_size+1);
+ /* if malloc failed... */
+ if (!message.msg) return retval;
+ read(fd, mtmp, st.st_size);
+ if (mtmp[st.st_size-1] == '\n')
+ mtmp[st.st_size-1] = '\0';
+ else
+ mtmp[st.st_size] = '\0';
+ close(fd);
+ /* Use conversation function to give user contents of motd */
+ pam_get_item(pamh, PAM_CONV, (const void **)&conversation);
+ conversation->conv(1, (const struct pam_message **)&pmessage,
+ &resp, conversation->appdata_ptr);
+ free(mtmp);
+ if (resp)
+ _pam_drop_reply(resp, 1);
+ }
+
+ return retval;
+}
+
+
+#ifdef PAM_STATIC
+
+/* static module data */
+
+struct pam_module _pam_motd_modstruct = {
+ "pam_motd",
+ NULL,
+ NULL,
+ NULL,
+ pam_sm_open_session,
+ pam_sm_close_session,
+ NULL,
+};
+
+#endif
+
+/* end of module definition */