diff options
Diffstat (limited to 'contrib/libpam/modules/pam_mail/pam_mail.c')
-rw-r--r-- | contrib/libpam/modules/pam_mail/pam_mail.c | 401 |
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 index 0000000..15160f3 --- /dev/null +++ b/contrib/libpam/modules/pam_mail/pam_mail.c @@ -0,0 +1,401 @@ +/* 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 */ |