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/* 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 <security/_pam_aconf.h>
#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>
#include <security/_pam_modutil.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;
}
static char default_motd[] = DEFAULT_MOTD;
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;
char *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) {
if (motd_path != default_motd)
free(motd_path);
/* fill in message buffer with contents of motd */
if ((fstat(fd, &st) < 0) || !st.st_size) {
close(fd);
return retval;
}
message.msg = mtmp = malloc(st.st_size+1);
/* if malloc failed... */
if (!message.msg) {
close(fd);
return retval;
}
if (_pammodutil_read(fd, mtmp, st.st_size) == 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 */
if (pam_get_item(pamh, PAM_CONV, (const void **)&conversation) ==
PAM_SUCCESS && conversation) {
conversation->conv(1, (const struct pam_message **)&pmessage,
&resp, conversation->appdata_ptr);
if (resp)
_pam_drop_reply(resp, 1);
}
}
free(mtmp);
} else {
if (motd_path != default_motd)
free(motd_path);
}
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 */
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