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-rw-r--r--contrib/libpam/modules/pam_mail/pam_mail.c401
1 files changed, 401 insertions, 0 deletions
diff --git a/contrib/libpam/modules/pam_mail/pam_mail.c b/contrib/libpam/modules/pam_mail/pam_mail.c
new file mode 100644
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+++ b/contrib/libpam/modules/pam_mail/pam_mail.c
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+/* pam_mail module */
+
+/*
+ * $Id: pam_mail.c,v 1.2 1997/02/15 16:06:14 morgan Exp morgan $
+ *
+ * Written by Andrew Morgan <morgan@parc.power.net> 1996/3/11
+ * $HOME additions by David Kinchlea <kinch@kinch.ark.com> 1997/1/7
+ *
+ * $Log: pam_mail.c,v $
+ * Revision 1.2 1997/02/15 16:06:14 morgan
+ * session -> setcred, also added "~"=$HOME
+ *
+ * Revision 1.1 1997/01/04 20:33:02 morgan
+ * Initial revision
+ */
+
+#define DEFAULT_MAIL_DIRECTORY "/var/spool/mail"
+#define MAIL_FILE_FORMAT "%s/%s"
+#define MAIL_ENV_NAME "MAIL"
+#define MAIL_ENV_FORMAT MAIL_ENV_NAME "=%s"
+#define YOUR_MAIL_FORMAT "You have %s mail in %s"
+
+#ifdef linux
+# define _GNU_SOURCE
+# include <features.h>
+#endif
+
+#include <ctype.h>
+#include <pwd.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#ifdef WANT_PWDB
+#include <pwdb/pwdb_public.h>
+#endif
+
+/*
+ * 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_AUTH
+
+#include <security/pam_modules.h>
+#include <security/_pam_macros.h>
+
+/* some syslogging */
+
+static void _log_err(int err, const char *format, ...)
+{
+ va_list args;
+
+ va_start(args, format);
+ openlog("PAM-mail", LOG_CONS|LOG_PID, LOG_AUTH);
+ vsyslog(err, format, args);
+ va_end(args);
+ closelog();
+}
+
+/* argument parsing */
+
+#define PAM_DEBUG_ARG 01
+#define PAM_NO_LOGIN 02
+#define PAM_LOGOUT_TOO 04
+#define PAM_NEW_MAIL_DIR 010
+#define PAM_MAIL_SILENT 020
+#define PAM_NO_ENV 040
+#define PAM_HOME_MAIL 0100
+#define PAM_EMPTY_TOO 0200
+
+static int _pam_parse(int flags, int argc, const char **argv, char **maildir)
+{
+ int ctrl=0;
+
+ if (flags & PAM_SILENT) {
+ ctrl |= PAM_MAIL_SILENT;
+ }
+
+ /* step through arguments */
+ for (; argc-- > 0; ++argv) {
+
+ /* generic options */
+
+ if (!strcmp(*argv,"debug"))
+ ctrl |= PAM_DEBUG_ARG;
+ else if (!strncmp(*argv,"dir=",4)) {
+ *maildir = x_strdup(4+*argv);
+ if (*maildir != NULL) {
+ D(("new mail directory: %s", *maildir));
+ ctrl |= PAM_NEW_MAIL_DIR;
+ } else {
+ _log_err(LOG_CRIT,
+ "failed to duplicate mail directory - ignored");
+ }
+ } else if (!strcmp(*argv,"close")) {
+ ctrl |= PAM_LOGOUT_TOO;
+ } else if (!strcmp(*argv,"nopen")) {
+ ctrl |= PAM_NO_LOGIN;
+ } else if (!strcmp(*argv,"noenv")) {
+ ctrl |= PAM_NO_ENV;
+ } else if (!strcmp(*argv,"empty")) {
+ ctrl |= PAM_EMPTY_TOO;
+ } else {
+ _log_err(LOG_ERR,"pam_parse: unknown option; %s",*argv);
+ }
+ }
+
+ return ctrl;
+}
+
+/* a front end for conversations */
+
+static int converse(pam_handle_t *pamh, int ctrl, int nargs
+ , struct pam_message **message
+ , struct pam_response **response)
+{
+ int retval;
+ struct pam_conv *conv;
+
+ D(("begin to converse"));
+
+ retval = pam_get_item( pamh, PAM_CONV, (const void **) &conv ) ;
+ if ( retval == PAM_SUCCESS ) {
+
+ retval = conv->conv(nargs, ( const struct pam_message ** ) message
+ , response, conv->appdata_ptr);
+
+ D(("returned from application's conversation function"));
+
+ if (retval != PAM_SUCCESS && (PAM_DEBUG_ARG & ctrl) ) {
+ _log_err(LOG_DEBUG, "conversation failure [%s]"
+ , pam_strerror(pamh, retval));
+ }
+
+ } else {
+ _log_err(LOG_ERR, "couldn't obtain coversation function [%s]"
+ , pam_strerror(pamh, retval));
+ }
+
+ D(("ready to return from module conversation"));
+
+ return retval; /* propagate error status */
+}
+
+static int get_folder(pam_handle_t *pamh, int ctrl
+ , char **path_mail, char **folder_p)
+{
+ int retval;
+ const char *user, *path;
+ char *folder;
+ const struct passwd *pwd=NULL;
+
+ retval = pam_get_user(pamh, &user, NULL);
+ if (retval != PAM_SUCCESS || user == NULL) {
+ _log_err(LOG_ERR, "no user specified");
+ return PAM_USER_UNKNOWN;
+ }
+
+ if (ctrl & PAM_NEW_MAIL_DIR) {
+ path = *path_mail;
+ if (*path == '~') { /* support for $HOME delivery */
+ pwd = getpwnam(user);
+ if (pwd == NULL) {
+ _log_err(LOG_ERR, "user [%s] unknown", user);
+ _pam_overwrite(*path_mail);
+ _pam_drop(*path_mail);
+ return PAM_USER_UNKNOWN;
+ }
+ /*
+ * "~/xxx" and "~xxx" are treated as same
+ */
+ if (!*++path || (*path == '/' && !*++path)) {
+ _log_err(LOG_ALERT, "badly formed mail path [%s]", *path_mail);
+ _pam_overwrite(*path_mail);
+ _pam_drop(*path_mail);
+ return PAM_ABORT;
+ }
+ ctrl |= PAM_HOME_MAIL;
+ }
+ } else {
+ path = DEFAULT_MAIL_DIRECTORY;
+ }
+
+ /* put folder together */
+
+ if (ctrl & PAM_HOME_MAIL) {
+ folder = malloc(sizeof(MAIL_FILE_FORMAT)
+ +strlen(pwd->pw_dir)+strlen(path));
+ } else {
+ folder = malloc(sizeof(MAIL_FILE_FORMAT)+strlen(path)+strlen(user));
+ }
+
+ if (folder != NULL) {
+ if (ctrl & PAM_HOME_MAIL) {
+ sprintf(folder, MAIL_FILE_FORMAT, pwd->pw_dir, path);
+ } else {
+ sprintf(folder, MAIL_FILE_FORMAT, path, user);
+ }
+ D(("folder =[%s]", folder));
+ }
+
+ /* tidy up */
+
+ _pam_overwrite(*path_mail);
+ _pam_drop(*path_mail);
+ user = NULL;
+
+ if (folder == NULL) {
+ _log_err(LOG_CRIT, "out of memory for mail folder");
+ return PAM_BUF_ERR;
+ }
+
+ *folder_p = folder;
+ folder = NULL;
+
+ return PAM_SUCCESS;
+}
+
+static const char *get_mail_status(int ctrl, const char *folder)
+{
+ const char *type;
+ struct stat mail_st;
+
+ if (stat(folder, &mail_st) == 0 && mail_st.st_size > 0) {
+ type = (mail_st.st_atime < mail_st.st_mtime) ? "new":"old" ;
+ } else if (ctrl & PAM_EMPTY_TOO) {
+ type = "no";
+ } else {
+ type = NULL;
+ }
+
+ memset(&mail_st, 0, sizeof(mail_st));
+ D(("user has %s mail in %s folder", type, folder));
+ return type;
+}
+
+static int report_mail(pam_handle_t *pamh, int ctrl
+ , const char *type, const char *folder)
+{
+ int retval;
+
+ if (!(ctrl & PAM_MAIL_SILENT)) {
+ char *remark;
+
+ remark = malloc(sizeof(YOUR_MAIL_FORMAT)+strlen(type)+strlen(folder));
+ if (remark == NULL) {
+ retval = PAM_BUF_ERR;
+ } else {
+ struct pam_message msg[1], *mesg[1];
+ struct pam_response *resp=NULL;
+
+ sprintf(remark, YOUR_MAIL_FORMAT, type, folder);
+
+ mesg[0] = &msg[0];
+ msg[0].msg_style = PAM_TEXT_INFO;
+ msg[0].msg = remark;
+
+ retval = converse(pamh, ctrl, 1, mesg, &resp);
+
+ _pam_overwrite(remark);
+ _pam_drop(remark);
+ if (resp)
+ _pam_drop_reply(resp, 1);
+ }
+ } else {
+ D(("keeping quiet"));
+ retval = PAM_SUCCESS;
+ }
+
+ D(("returning %s", pam_strerror(pamh, retval)));
+ return retval;
+}
+
+/* --- authentication management functions (only) --- */
+
+/*
+ * Cannot use mail to authenticate yourself
+ */
+
+PAM_EXTERN
+int pam_sm_authenticate(pam_handle_t *pamh,int flags,int argc
+ ,const char **argv)
+{
+ return PAM_IGNORE;
+}
+
+/*
+ * MAIL is a "credential"
+ */
+
+PAM_EXTERN
+int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc
+ , const char **argv)
+{
+ int retval, ctrl;
+ char *path_mail=NULL, *folder;
+ const char *type;
+
+ /*
+ * this module (un)sets the MAIL environment variable, and checks if
+ * the user has any new mail.
+ */
+
+ ctrl = _pam_parse(flags, argc, argv, &path_mail);
+
+ /* Do we have anything to do? */
+
+ if (!(flags & (PAM_ESTABLISH_CRED|PAM_DELETE_CRED))) {
+ return PAM_SUCCESS;
+ }
+
+ /* which folder? */
+
+ retval = get_folder(pamh, ctrl, &path_mail, &folder);
+ if (retval != PAM_SUCCESS) {
+ D(("failed to find folder"));
+ return retval;
+ }
+
+ /* set the MAIL variable? */
+
+ if (!(ctrl & PAM_NO_ENV) && (flags & PAM_ESTABLISH_CRED)) {
+ char *tmp;
+
+ tmp = malloc(strlen(folder)+sizeof(MAIL_ENV_FORMAT));
+ if (tmp != NULL) {
+ sprintf(tmp, MAIL_ENV_FORMAT, folder);
+ D(("setting env: %s", tmp));
+ retval = pam_putenv(pamh, tmp);
+ _pam_overwrite(tmp);
+ _pam_drop(tmp);
+ if (retval != PAM_SUCCESS) {
+ _pam_overwrite(folder);
+ _pam_drop(folder);
+ _log_err(LOG_CRIT, "unable to set " MAIL_ENV_NAME " variable");
+ return retval;
+ }
+ } else {
+ _log_err(LOG_CRIT, "no memory for " MAIL_ENV_NAME " variable");
+ _pam_overwrite(folder);
+ _pam_drop(folder);
+ return retval;
+ }
+ } else {
+ D(("not setting " MAIL_ENV_NAME " variable"));
+ }
+
+ /*
+ * OK. we've got the mail folder... what about its status?
+ */
+
+ if (((flags & PAM_ESTABLISH_CRED) && !(ctrl & PAM_NO_LOGIN))
+ || ((flags & PAM_DELETE_CRED) && (ctrl & PAM_LOGOUT_TOO))) {
+ type = get_mail_status(ctrl, folder);
+ if (type != NULL) {
+ retval = report_mail(pamh, ctrl, type, folder);
+ type = NULL;
+ }
+ }
+
+ /*
+ * Delete environment variable?
+ */
+
+ if (flags & PAM_DELETE_CRED) {
+ (void) pam_putenv(pamh, MAIL_ENV_NAME);
+ }
+
+ _pam_overwrite(folder); /* clean up */
+ _pam_drop(folder);
+
+ /* indicate success or failure */
+
+ return retval;
+}
+
+#ifdef PAM_STATIC
+
+/* static module data */
+
+struct pam_module _pam_mail_modstruct = {
+ "pam_mail",
+ pam_sm_authenticate,
+ pam_sm_setcred,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+};
+
+#endif
+
+/* end of module definition */
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