src/auth/passdb-passwd.c

	passdb-passwd.c revision d5abbb932a0a598f002da39a8b3326643b1b5efc
/* Copyright (c) 2002-2008 Dovecot authors, see the included COPYING file */

#include "common.h"
#include "passdb.h"

#ifdef PASSDB_PASSWD

#include "safe-memset.h"

#include <pwd.h>

#define PASSWD_CACHE_KEY "%u"
#define PASSWD_PASS_SCHEME "CRYPT"

static void
passwd_verify_plain(struct auth_request *request, const char *password,
            verify_plain_callback_t *callback)
{
    struct passwd *pw;
    int ret;

    auth_request_log_debug(request, "passwd", "lookup");

    pw = getpwnam(request->user);
    if (pw == NULL) {
        auth_request_log_info(request, "passwd", "unknown user");
        callback(PASSDB_RESULT_USER_UNKNOWN, request);
        return;
    }

    if (!IS_VALID_PASSWD(pw->pw_passwd)) {
        auth_request_log_info(request, "passwd",
            "invalid password field '%s'", pw->pw_passwd);
        callback(PASSDB_RESULT_USER_DISABLED, request);
        return;
    }

    /* save the password so cache can use it */
    auth_request_set_field(request, "password", pw->pw_passwd,
                   PASSWD_PASS_SCHEME);

    /* check if the password is valid */
    ret = auth_request_password_verify(request, password, pw->pw_passwd,
                       PASSWD_PASS_SCHEME, "passwd");

    /* clear the passwords from memory */
    safe_memset(pw->pw_passwd, 0, strlen(pw->pw_passwd));

    if (ret <= 0) {
        callback(PASSDB_RESULT_PASSWORD_MISMATCH, request);
        return;
    }

    /* make sure we're using the username exactly as it's in the database */
        auth_request_set_field(request, "user", pw->pw_name, NULL);

    callback(PASSDB_RESULT_OK, request);
}

static void passwd_init(struct passdb_module *module, const char *args)
{
    if (strcmp(args, "blocking=yes") == 0)
        module->blocking = TRUE;

    module->cache_key = PASSWD_CACHE_KEY;
    module->default_pass_scheme = PASSWD_PASS_SCHEME;
}

static void passwd_deinit(struct passdb_module *module ATTR_UNUSED)
{
    endpwent();
}

struct passdb_module_interface passdb_passwd = {
    "passwd",

    NULL,
    passwd_init,
    passwd_deinit,

    passwd_verify_plain,
    NULL,
    NULL
};

#else
struct passdb_module_interface passdb_passwd = {
    MEMBER(name) "passwd"
};
#endif