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deltachat-core/libs/cyrussasl/lib/server.c

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/* SASL server API implementation
* Rob Siemborski
* Tim Martin
* $Id: server.c,v 1.177 2011/11/08 17:22:40 murch Exp $
*/
/*
* Copyright (c) 1998-2003 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any other legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* local functions/structs don't start with sasl
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#ifndef macintosh
#include <sys/types.h>
#include <sys/stat.h>
#endif
#include <fcntl.h>
#include <string.h>
#include <ctype.h>
#include "sasl.h"
#include "saslint.h"
#include "saslplug.h"
#include "saslutil.h"
#define DEFAULT_CHECKPASS_MECH "auxprop"
/* Contains functions:
*
* sasl_server_init
* sasl_server_new
* sasl_listmech
* sasl_server_start
* sasl_server_step
* sasl_checkpass
* sasl_checkapop
* sasl_user_exists
* sasl_setpass
*/
/* if we've initialized the server sucessfully */
static int _sasl_server_active = 0;
/* For access by other modules */
int _is_sasl_server_active(void) { return _sasl_server_active; }
static int _sasl_checkpass(sasl_conn_t *conn,
const char *user, unsigned userlen,
const char *pass, unsigned passlen);
static mech_list_t *mechlist = NULL; /* global var which holds the list */
static sasl_global_callbacks_t global_callbacks;
/* set the password for a user
* conn -- SASL connection
* user -- user name
* pass -- plaintext password, may be NULL to remove user
* passlen -- length of password, 0 = strlen(pass)
* oldpass -- NULL will sometimes work
* oldpasslen -- length of password, 0 = strlen(oldpass)
* flags -- see flags below
*
* returns:
* SASL_NOCHANGE -- proper entry already exists
* SASL_NOMECH -- no authdb supports password setting as configured
* SASL_NOVERIFY -- user exists, but no settable password present
* SASL_DISABLED -- account disabled
* SASL_PWLOCK -- password locked
* SASL_WEAKPASS -- password too weak for security policy
* SASL_NOUSERPASS -- user-supplied passwords not permitted
* SASL_FAIL -- OS error
* SASL_BADPARAM -- password too long
* SASL_OK -- successful
*/
int sasl_setpass(sasl_conn_t *conn,
const char *user,
const char *pass,
unsigned passlen,
const char *oldpass,
unsigned oldpasslen,
unsigned flags)
{
int result = SASL_OK, tmpresult;
sasl_server_conn_t *s_conn = (sasl_server_conn_t *) conn;
const char *password_request[] = { SASL_AUX_PASSWORD_PROP, NULL };
const char *user_delete_request[] = { SASL_AUX_PASSWORD_PROP, SASL_AUX_ALL, NULL };
sasl_server_userdb_setpass_t *setpass_cb = NULL;
void *context = NULL;
int tried_setpass = 0;
int failed = 0;
mechanism_t *sm;
server_sasl_mechanism_t *m;
char *current_mech;
if (!_sasl_server_active || !mechlist) return SASL_NOTINIT;
/* check params */
if (!conn) return SASL_BADPARAM;
if (conn->type != SASL_CONN_SERVER) PARAMERROR(conn);
if ((!(flags & SASL_SET_DISABLE) && passlen == 0)
|| ((flags & SASL_SET_CREATE) && (flags & SASL_SET_DISABLE)))
PARAMERROR(conn);
/* Check that we have an active SASL mechanism */
if (sasl_getprop (conn,
SASL_MECHNAME,
(const void **) &current_mech) != SASL_OK) {
current_mech = NULL;
}
if ( (flags & SASL_SET_CURMECH_ONLY) &&
(current_mech == NULL) ) {
sasl_seterror( conn, SASL_NOLOG,
"No current SASL mechanism available");
RETURN(conn, SASL_BADPARAM);
}
/* Do we want to store SASL_AUX_PASSWORD_PROP (plain text)? and
* Do we have an auxprop backend that can store properties?
*/
if ((flags & SASL_SET_DISABLE || !(flags & SASL_SET_NOPLAIN)) &&
sasl_auxprop_store(NULL, NULL, NULL) == SASL_OK) {
tried_setpass++;
if (flags & SASL_SET_DISABLE) {
pass = NULL;
passlen = 0;
result = prop_request(s_conn->sparams->propctx, user_delete_request);
} else {
result = prop_request(s_conn->sparams->propctx, password_request);
}
if (result == SASL_OK) {
/* NOTE: When deleting users, this will work in a backward compatible way */
result = prop_set(s_conn->sparams->propctx, SASL_AUX_PASSWORD_PROP,
pass, passlen);
}
if (result == SASL_OK && flags & SASL_SET_DISABLE) {
result = prop_set(s_conn->sparams->propctx, SASL_AUX_ALL,
NULL, 0);
}
if (result == SASL_OK) {
result = sasl_auxprop_store(conn, s_conn->sparams->propctx, user);
}
if (result != SASL_OK) {
_sasl_log(conn, SASL_LOG_ERR,
"setpass failed for %s: %z",
user, result);
failed++;
} else {
_sasl_log(conn, SASL_LOG_NOTE,
"setpass succeeded for %s", user);
}
}
/* We want to preserve the current value of result, so we use tmpresult below */
/* call userdb callback function */
tmpresult = _sasl_getcallback(conn, SASL_CB_SERVER_USERDB_SETPASS,
(sasl_callback_ft *)&setpass_cb, &context);
if (tmpresult == SASL_OK && setpass_cb) {
tried_setpass++;
tmpresult = setpass_cb(conn, context, user, pass, passlen,
s_conn->sparams->propctx, flags);
if(tmpresult != SASL_OK) {
if (tmpresult == SASL_CONSTRAINT_VIOLAT) {
if (result == SASL_OK) {
result = tmpresult;
}
} else {
result = tmpresult;
}
_sasl_log(conn, SASL_LOG_ERR,
"setpass callback failed for %s: %z",
user, tmpresult);
failed++;
} else {
_sasl_log(conn, SASL_LOG_NOTE,
"setpass callback succeeded for %s", user);
}
}
/* now we let the mechanisms set their secrets */
for (sm = s_conn->mech_list; sm; sm = sm->next) {
m = &sm->m;
if (!m->plug->setpass) {
/* can't set pass for this mech */
continue;
}
/* Invoke only one setpass for the currently selected mechanism,
if SASL_SET_CURMECH_ONLY is specified */
if ((flags & SASL_SET_CURMECH_ONLY) &&
(strcmp(current_mech, m->plug->mech_name) != 0)) {
continue;
}
tried_setpass++;
tmpresult = m->plug->setpass(m->plug->glob_context,
((sasl_server_conn_t *)conn)->sparams,
user,
pass,
passlen,
oldpass, oldpasslen,
flags);
if (tmpresult == SASL_OK) {
_sasl_log(conn, SASL_LOG_NOTE,
"%s: set secret for %s", m->plug->mech_name, user);
m->condition = SASL_OK; /* if we previously thought the
mechanism didn't have any user secrets
we now think it does */
} else if (tmpresult == SASL_NOCHANGE) {
_sasl_log(conn, SASL_LOG_NOTE,
"%s: secret not changed for %s", m->plug->mech_name, user);
} else if (tmpresult == SASL_CONSTRAINT_VIOLAT) {
_sasl_log(conn, SASL_LOG_ERR,
"%s: failed to set secret for %s: constrain violation",
m->plug->mech_name, user);
if (result == SASL_OK) {
result = tmpresult;
}
failed++;
} else {
result = tmpresult;
_sasl_log(conn, SASL_LOG_ERR,
"%s: failed to set secret for %s: %z (%m)",
m->plug->mech_name, user, tmpresult,
#ifndef WIN32
errno
#else
GetLastError()
#endif
);
failed++;
}
}
if (!tried_setpass) {
_sasl_log(conn, SASL_LOG_WARN,
"secret not changed for %s: "
"no writable auxprop plugin or setpass callback found",
user);
} else if (result == SASL_CONSTRAINT_VIOLAT) {
/* If not all setpass failed with SASL_CONSTRAINT_VIOLAT -
ignore SASL_CONSTRAINT_VIOLAT */
if (failed < tried_setpass) {
result = SASL_OK;
}
}
RETURN(conn, result);
}
/* local mechanism which disposes of server */
static void server_dispose(sasl_conn_t *pconn)
{
sasl_server_conn_t *s_conn= (sasl_server_conn_t *) pconn;
context_list_t *cur, *cur_next;
/* Just sanity check that sasl_server_done wasn't called yet */
if (_sasl_server_active != 0) {
if (s_conn->mech) {
void (*mech_dispose)(void *conn_context, const sasl_utils_t *utils);
mech_dispose = s_conn->mech->m.plug->mech_dispose;
if (mech_dispose) {
mech_dispose(pconn->context, s_conn->sparams->utils);
}
}
pconn->context = NULL;
for(cur = s_conn->mech_contexts; cur; cur=cur_next) {
cur_next = cur->next;
if (cur->context) {
cur->mech->m.plug->mech_dispose(cur->context, s_conn->sparams->utils);
}
sasl_FREE(cur);
}
s_conn->mech_contexts = NULL;
}
_sasl_free_utils(&s_conn->sparams->utils);
if (s_conn->sparams->propctx) {
prop_dispose(&s_conn->sparams->propctx);
}
if (s_conn->appname) {
sasl_FREE(s_conn->appname);
}
if (s_conn->user_realm) {
sasl_FREE(s_conn->user_realm);
}
if (s_conn->sparams) {
sasl_FREE(s_conn->sparams);
}
if (s_conn->mech_list != mechlist->mech_list) {
/* free connection-specific mech_list */
mechanism_t *m, *prevm;
m = s_conn->mech_list; /* m point to beginning of the list */
while (m) {
prevm = m;
m = m->next;
sasl_FREE(prevm);
}
}
_sasl_conn_dispose(pconn);
}
static int init_mechlist(void)
{
sasl_utils_t *newutils = NULL;
/* set util functions - need to do rest */
newutils = _sasl_alloc_utils(NULL, &global_callbacks);
if (newutils == NULL)
return SASL_NOMEM;
newutils->checkpass = &_sasl_checkpass;
mechlist->utils = newutils;
mechlist->mech_list = NULL;
mechlist->mech_length = 0;
return SASL_OK;
}
static int mech_compare(const sasl_server_plug_t *a,
const sasl_server_plug_t *b)
{
unsigned sec_diff;
unsigned features_diff;
/* XXX the following is fairly arbitrary, but its independent
of the order in which the plugins are loaded
*/
sec_diff = a->security_flags ^ b->security_flags;
if (sec_diff & a->security_flags & SASL_SEC_NOANONYMOUS) return 1;
if (sec_diff & b->security_flags & SASL_SEC_NOANONYMOUS) return -1;
if (sec_diff & a->security_flags & SASL_SEC_NOPLAINTEXT) return 1;
if (sec_diff & b->security_flags & SASL_SEC_NOPLAINTEXT) return -1;
if (sec_diff & a->security_flags & SASL_SEC_MUTUAL_AUTH) return 1;
if (sec_diff & b->security_flags & SASL_SEC_MUTUAL_AUTH) return -1;
if (sec_diff & a->security_flags & SASL_SEC_NOACTIVE) return 1;
if (sec_diff & b->security_flags & SASL_SEC_NOACTIVE) return -1;
if (sec_diff & a->security_flags & SASL_SEC_NODICTIONARY) return 1;
if (sec_diff & b->security_flags & SASL_SEC_NODICTIONARY) return -1;
if (sec_diff & a->security_flags & SASL_SEC_FORWARD_SECRECY) return 1;
if (sec_diff & b->security_flags & SASL_SEC_FORWARD_SECRECY) return -1;
features_diff = a->features ^ b->features;
if (features_diff & a->features & SASL_FEAT_CHANNEL_BINDING) return 1;
if (features_diff & b->features & SASL_FEAT_CHANNEL_BINDING) return -1;
if (a->max_ssf > b->max_ssf) return 1;
if (a->max_ssf < b->max_ssf) return -1;
return 0;
}
/*
* parameters:
* p - entry point
*/
int sasl_server_add_plugin(const char *plugname,
sasl_server_plug_init_t *p)
{
int plugcount;
sasl_server_plug_t *pluglist;
sasl_server_plug_init_t *entry_point;
int result;
int version;
int lupe;
if(!plugname || !p) return SASL_BADPARAM;
entry_point = (sasl_server_plug_init_t *)p;
/* call into the shared library asking for information about it */
/* version is filled in with the version of the plugin */
result = entry_point(mechlist->utils, SASL_SERVER_PLUG_VERSION, &version,
&pluglist, &plugcount);
if ((result != SASL_OK) && (result != SASL_NOUSER)
&& (result != SASL_CONTINUE)) {
_sasl_log(NULL, SASL_LOG_DEBUG,
"%s_client_plug_init() failed in sasl_server_add_plugin(): %z\n",
plugname, result);
return result;
}
/* Make sure plugin is using the same SASL version as us */
if (version != SASL_SERVER_PLUG_VERSION)
{
_sasl_log(NULL,
SASL_LOG_ERR,
"version mismatch on sasl_server_add_plugin for '%s': %d expected, but %d reported",
plugname,
SASL_SERVER_PLUG_VERSION,
version);
return SASL_BADVERS;
}
for (lupe=0;lupe < plugcount ;lupe++, pluglist++)
{
mechanism_t *mech, *mp;
mech = sasl_ALLOC(sizeof(mechanism_t));
if (! mech) return SASL_NOMEM;
memset (mech, 0, sizeof(mechanism_t));
mech->m.plug = pluglist;
if(_sasl_strdup(plugname, &mech->m.plugname, NULL) != SASL_OK) {
sasl_FREE(mech);
return SASL_NOMEM;
}
mech->m.version = version;
/* whether this mech actually has any users in it's db */
mech->m.condition = result; /* SASL_OK, SASL_CONTINUE or SASL_NOUSER */
/* mech->m.f = NULL; */
/* sort mech_list by relative "strength" */
mp = mechlist->mech_list;
if (!mp || mech_compare(pluglist, mp->m.plug) >= 0) {
/* add mech to head of list */
mech->next = mechlist->mech_list;
mechlist->mech_list = mech;
} else {
/* find where to insert mech into list */
while (mp->next &&
mech_compare(pluglist, mp->next->m.plug) <= 0) mp = mp->next;
mech->next = mp->next;
mp->next = mech;
}
mechlist->mech_length++;
}
return SASL_OK;
}
int sasl_server_done(void)
{
int result = SASL_CONTINUE;
if (_sasl_server_cleanup_hook == NULL && _sasl_client_cleanup_hook == NULL) {
return SASL_NOTINIT;
}
if (_sasl_server_cleanup_hook) {
result = _sasl_server_cleanup_hook();
if (result == SASL_OK) {
_sasl_server_idle_hook = NULL;
_sasl_server_cleanup_hook = NULL;
} else {
return result;
}
}
if (_sasl_server_cleanup_hook || _sasl_client_cleanup_hook) {
return result;
}
sasl_common_done();
return SASL_OK;
}
static int server_done(void) {
mechanism_t *m;
mechanism_t *prevm;
if(_sasl_server_active == 0)
return SASL_NOTINIT;
else
_sasl_server_active--;
if(_sasl_server_active) {
/* Don't de-init yet! Our refcount is nonzero. */
return SASL_CONTINUE;
}
if (mechlist != NULL)
{
m=mechlist->mech_list; /* m point to beginning of the list */
while (m!=NULL)
{
prevm=m;
m=m->next;
if (prevm->m.plug->mech_free) {
prevm->m.plug->mech_free(prevm->m.plug->glob_context,
mechlist->utils);
}
sasl_FREE(prevm->m.plugname);
sasl_FREE(prevm);
}
_sasl_free_utils(&mechlist->utils);
sasl_FREE(mechlist);
mechlist = NULL;
}
/* Free the auxprop plugins */
_sasl_auxprop_free();
global_callbacks.callbacks = NULL;
global_callbacks.appname = NULL;
sasl_config_done();
return SASL_OK;
}
static int server_idle(sasl_conn_t *conn)
{
sasl_server_conn_t *s_conn = (sasl_server_conn_t *) conn;
mechanism_t *m;
if (! mechlist) {
return 0;
}
for (m = s_conn->mech_list;
m != NULL;
m = m->next) {
if (m->m.plug->idle
&& m->m.plug->idle(m->m.plug->glob_context,
conn,
conn ? ((sasl_server_conn_t *)conn)->sparams : NULL)) {
return 1;
}
}
return 0;
}
static int load_config(const sasl_callback_t *verifyfile_cb)
{
int result;
const char *path_to_config = NULL;
size_t path_len;
char *config_filename = NULL;
size_t len;
const sasl_callback_t *getconfpath_cb = NULL;
const char * next;
/* If appname was not provided, behave as if there is no config file
(see also sasl_config_init() */
if (global_callbacks.appname == NULL) {
return SASL_CONTINUE;
}
/* get the path to the config file */
getconfpath_cb = _sasl_find_getconfpath_callback( global_callbacks.callbacks );
if (getconfpath_cb == NULL) return SASL_BADPARAM;
/* getconfpath_cb->proc MUST be a sasl_getconfpath_t; if only C had a type
system */
result = ((sasl_getconfpath_t *)(getconfpath_cb->proc))(getconfpath_cb->context,
(char **) &path_to_config);
if (result != SASL_OK) goto done;
if (path_to_config == NULL) path_to_config = "";
next = path_to_config;
while (next != NULL) {
next = strchr(path_to_config, PATHS_DELIMITER);
/* length = length of path + '/' + length of appname + ".conf" + 1
for '\0' */
if (next != NULL) {
path_len = next - path_to_config;
next++; /* Skip to the next path */
} else {
path_len = strlen(path_to_config);
}
len = path_len + 2 + strlen(global_callbacks.appname) + 5 + 1;
if (len > PATH_MAX ) {
result = SASL_FAIL;
goto done;
}
/* construct the filename for the config file */
config_filename = sasl_ALLOC((unsigned)len);
if (! config_filename) {
result = SASL_NOMEM;
goto done;
}
snprintf(config_filename, len, "%.*s%c%s.conf", path_len, path_to_config,
HIER_DELIMITER, global_callbacks.appname);
/* Ask the application if it's safe to use this file */
result = ((sasl_verifyfile_t *)(verifyfile_cb->proc))(verifyfile_cb->context,
config_filename, SASL_VRFY_CONF);
/* returns SASL_CONTINUE if the config file doesn't exist */
if (result == SASL_OK) {
result = sasl_config_init(config_filename);
if (result != SASL_CONTINUE) {
/* We are done */
break;
}
}
if (config_filename) {
sasl_FREE(config_filename);
config_filename = NULL;
}
path_to_config = next;
}
done:
if (config_filename) sasl_FREE(config_filename);
return result;
}
/*
* Verify that all the callbacks are valid
*/
static int verify_server_callbacks(const sasl_callback_t *callbacks)
{
if (callbacks == NULL) return SASL_OK;
while (callbacks->id != SASL_CB_LIST_END) {
if (callbacks->proc==NULL) return SASL_FAIL;
callbacks++;
}
return SASL_OK;
}
static char *grab_field(char *line, char **eofield)
{
int d = 0;
char *field;
while (isspace((int) *line)) line++;
/* find end of field */
while (line[d] && !isspace(((int) line[d]))) d++;
field = sasl_ALLOC(d + 1);
if (!field) { return NULL; }
memcpy(field, line, d);
field[d] = '\0';
*eofield = line + d;
return field;
}
struct secflag_map_s {
char *name;
int value;
};
struct secflag_map_s secflag_map[] = {
{ "noplaintext", SASL_SEC_NOPLAINTEXT },
{ "noactive", SASL_SEC_NOACTIVE },
{ "nodictionary", SASL_SEC_NODICTIONARY },
{ "forward_secrecy", SASL_SEC_FORWARD_SECRECY },
{ "noanonymous", SASL_SEC_NOANONYMOUS },
{ "pass_credentials", SASL_SEC_PASS_CREDENTIALS },
{ "mutual_auth", SASL_SEC_MUTUAL_AUTH },
{ NULL, 0x0 }
};
static int parse_mechlist_file(const char *mechlistfile)
{
FILE *f;
char buf[1024];
char *t, *ptr;
int r = 0;
f = fopen(mechlistfile, "r");
if (!f) return SASL_FAIL;
r = SASL_OK;
while (fgets(buf, sizeof(buf), f) != NULL) {
mechanism_t *n = sasl_ALLOC(sizeof(mechanism_t));
sasl_server_plug_t *nplug;
if (n == NULL) { r = SASL_NOMEM; break; }
n->m.version = SASL_SERVER_PLUG_VERSION;
n->m.condition = SASL_CONTINUE;
nplug = sasl_ALLOC(sizeof(sasl_server_plug_t));
if (nplug == NULL) { r = SASL_NOMEM; break; }
memset(nplug, 0, sizeof(sasl_server_plug_t));
/* each line is:
plugin-file WS mech_name WS max_ssf *(WS security_flag) RET
*/
/* grab file */
n->m.f = grab_field(buf, &ptr);
/* grab mech_name */
nplug->mech_name = grab_field(ptr, &ptr);
/* grab max_ssf */
nplug->max_ssf = strtol(ptr, &ptr, 10);
/* grab security flags */
while (*ptr != '\n') {
struct secflag_map_s *map;
/* read security flag */
t = grab_field(ptr, &ptr);
map = secflag_map;
while (map->name) {
if (!strcasecmp(t, map->name)) {
nplug->security_flags |= map->value;
break;
}
map++;
}
if (!map->name) {
_sasl_log(NULL, SASL_LOG_ERR,
"%s: couldn't identify flag '%s'",
nplug->mech_name, t);
}
free(t);
}
/* insert mechanism into mechlist */
n->m.plug = nplug;
n->next = mechlist->mech_list;
mechlist->mech_list = n;
mechlist->mech_length++;
}
fclose(f);
return r;
}
/* initialize server drivers, done once per process
* callbacks -- callbacks for all server connections; must include
* getopt callback
* appname -- name of calling application
* (for lower level logging and reading of the configuration file)
* results:
* state -- server state
* returns:
* SASL_OK -- success
* SASL_BADPARAM -- error in config file
* SASL_NOMEM -- memory failure
* SASL_BADVERS -- Mechanism version mismatch
*/
int sasl_server_init(const sasl_callback_t *callbacks,
const char *appname)
{
int ret;
const sasl_callback_t *vf;
const char *pluginfile = NULL;
#ifdef PIC
sasl_getopt_t *getopt;
void *context;
#endif
const add_plugin_list_t ep_list[] = {
{ "sasl_server_plug_init", (add_plugin_t *)sasl_server_add_plugin },
{ "sasl_auxprop_plug_init", (add_plugin_t *)sasl_auxprop_add_plugin },
{ "sasl_canonuser_init", (add_plugin_t *)sasl_canonuser_add_plugin },
{ NULL, NULL }
};
/* lock allocation type */
_sasl_allocation_locked++;
/* we require the appname (if present) to be short enough to be a path */
if (appname != NULL && strlen(appname) >= PATH_MAX)
return SASL_BADPARAM;
if (_sasl_server_active) {
/* We're already active, just increase our refcount */
/* xxx do something with the callback structure? */
_sasl_server_active++;
return SASL_OK;
}
ret = _sasl_common_init(&global_callbacks);
if (ret != SASL_OK)
return ret;
/* verify that the callbacks look ok */
ret = verify_server_callbacks(callbacks);
if (ret != SASL_OK)
return ret;
global_callbacks.callbacks = callbacks;
/* A shared library calling sasl_server_init will pass NULL as appname.
This should retain the original appname. */
if (appname != NULL) {
global_callbacks.appname = appname;
}
/* If we fail now, we have to call server_done */
_sasl_server_active = 1;
/* allocate mechlist and set it to empty */
mechlist = sasl_ALLOC(sizeof(mech_list_t));
if (mechlist == NULL) {
server_done();
return SASL_NOMEM;
}
ret = init_mechlist();
if (ret != SASL_OK) {
server_done();
return ret;
}
vf = _sasl_find_verifyfile_callback(callbacks);
/* load config file if applicable */
ret = load_config(vf);
if ((ret != SASL_OK) && (ret != SASL_CONTINUE)) {
server_done();
return ret;
}
/* load internal plugins */
sasl_server_add_plugin("EXTERNAL", &external_server_plug_init);
#ifdef PIC
/* delayed loading of plugins? (DSO only, as it doesn't
* make much [any] sense to delay in the static library case) */
if (_sasl_getcallback(NULL, SASL_CB_GETOPT, (sasl_callback_ft *)&getopt, &context)
== SASL_OK) {
/* No sasl_conn_t was given to getcallback, so we provide the
* global callbacks structure */
ret = getopt(&global_callbacks, NULL, "plugin_list", &pluginfile, NULL);
}
#endif
if (pluginfile != NULL) {
/* this file should contain a list of plugins available.
we'll load on demand. */
/* Ask the application if it's safe to use this file */
ret = ((sasl_verifyfile_t *)(vf->proc))(vf->context,
pluginfile,
SASL_VRFY_CONF);
if (ret != SASL_OK) {
_sasl_log(NULL, SASL_LOG_ERR,
"unable to load plugin list %s: %z", pluginfile, ret);
}
if (ret == SASL_OK) {
ret = parse_mechlist_file(pluginfile);
}
} else {
/* load all plugins now */
ret = _sasl_load_plugins(ep_list,
_sasl_find_getpath_callback(callbacks),
_sasl_find_verifyfile_callback(callbacks));
}
if (ret == SASL_OK) {
_sasl_server_cleanup_hook = &server_done;
_sasl_server_idle_hook = &server_idle;
ret = _sasl_build_mechlist();
} else {
server_done();
}
return ret;
}
/*
* Once we have the users plaintext password we
* may want to transition them. That is put entries
* for them in the passwd database for other
* stronger mechanism
*
* for example PLAIN -> CRAM-MD5
*/
static int
_sasl_transition(sasl_conn_t * conn,
const char * pass,
unsigned passlen)
{
const char *dotrans = "n";
sasl_getopt_t *getopt;
int result = SASL_OK;
void *context;
unsigned flags = 0;
if (! conn)
return SASL_BADPARAM;
if (! conn->oparams.authid)
PARAMERROR(conn);
/* check if this is enabled: default to false */
if (_sasl_getcallback(conn, SASL_CB_GETOPT, (sasl_callback_ft *)&getopt, &context) == SASL_OK)
{
getopt(context, NULL, "auto_transition", &dotrans, NULL);
if (dotrans == NULL) dotrans = "n";
}
if (!strcmp(dotrans, "noplain")) flags |= SASL_SET_NOPLAIN;
if (flags || *dotrans == '1' || *dotrans == 'y' ||
(*dotrans == 'o' && dotrans[1] == 'n') || *dotrans == 't') {
/* ok, it's on! */
_sasl_log(conn, SASL_LOG_NOTE,
"transitioning user %s to auxprop database",
conn->oparams.authid);
result = sasl_setpass(conn,
conn->oparams.authid,
pass,
passlen,
NULL, 0, SASL_SET_CREATE | flags);
}
RETURN(conn,result);
}
/* create context for a single SASL connection
* service -- registered name of the service using SASL (e.g. "imap")
* serverFQDN -- Fully qualified domain name of server. NULL means use
* gethostname() or equivalent.
* Useful for multi-homed servers.
* user_realm -- permits multiple user realms on server, NULL = default
* iplocalport -- server IPv4/IPv6 domain literal string with port
* (if NULL, then mechanisms requiring IPaddr are disabled)
* ipremoteport -- client IPv4/IPv6 domain literal string with port
* (if NULL, then mechanisms requiring IPaddr are disabled)
* callbacks -- callbacks (e.g., authorization, lang, new getopt context)
* flags -- usage flags (see above)
* returns:
* pconn -- new connection context
*
* returns:
* SASL_OK -- success
* SASL_NOMEM -- not enough memory
*/
int sasl_server_new(const char *service,
const char *serverFQDN,
const char *user_realm,
const char *iplocalport,
const char *ipremoteport,
const sasl_callback_t *callbacks,
unsigned flags,
sasl_conn_t **pconn)
{
int result;
sasl_server_conn_t *serverconn;
sasl_utils_t *utils;
sasl_getopt_t *getopt;
void *context;
const char *log_level, *auto_trans;
const char *mlist = NULL;
int plus = 0;
if (_sasl_server_active==0) return SASL_NOTINIT;
if (! pconn) return SASL_FAIL;
if (! service) return SASL_FAIL;
*pconn=sasl_ALLOC(sizeof(sasl_server_conn_t));
if (*pconn==NULL) return SASL_NOMEM;
memset(*pconn, 0, sizeof(sasl_server_conn_t));
serverconn = (sasl_server_conn_t *)*pconn;
/* make sparams */
serverconn->sparams=sasl_ALLOC(sizeof(sasl_server_params_t));
if (serverconn->sparams==NULL)
MEMERROR(*pconn);
memset(serverconn->sparams, 0, sizeof(sasl_server_params_t));
(*pconn)->destroy_conn = &server_dispose;
result = _sasl_conn_init(*pconn, service, flags, SASL_CONN_SERVER,
&server_idle, serverFQDN,
iplocalport, ipremoteport,
callbacks, &global_callbacks);
if (result != SASL_OK)
goto done_error;
/* set util functions - need to do rest */
utils=_sasl_alloc_utils(*pconn, &global_callbacks);
if (!utils) {
result = SASL_NOMEM;
goto done_error;
}
utils->checkpass = &_sasl_checkpass;
/* Setup the propctx -> We'll assume the default size */
serverconn->sparams->propctx=prop_new(0);
if(!serverconn->sparams->propctx) {
result = SASL_NOMEM;
goto done_error;
}
serverconn->sparams->service = (*pconn)->service;
serverconn->sparams->servicelen = (unsigned) strlen((*pconn)->service);
if (global_callbacks.appname && global_callbacks.appname[0] != '\0') {
result = _sasl_strdup (global_callbacks.appname,
&serverconn->appname,
NULL);
if (result != SASL_OK) {
result = SASL_NOMEM;
goto done_error;
}
serverconn->sparams->appname = serverconn->appname;
serverconn->sparams->applen = (unsigned) strlen(serverconn->sparams->appname);
} else {
serverconn->appname = NULL;
serverconn->sparams->appname = NULL;
serverconn->sparams->applen = 0;
}
serverconn->sparams->serverFQDN = (*pconn)->serverFQDN;
serverconn->sparams->slen = (unsigned) strlen((*pconn)->serverFQDN);
if (user_realm) {
result = _sasl_strdup(user_realm, &serverconn->user_realm, NULL);
serverconn->sparams->urlen = (unsigned) strlen(user_realm);
serverconn->sparams->user_realm = serverconn->user_realm;
} else {
serverconn->user_realm = NULL;
/* the sparams is already zeroed */
}
serverconn->sparams->callbacks = callbacks;
log_level = auto_trans = NULL;
if(_sasl_getcallback(*pconn, SASL_CB_GETOPT, (sasl_callback_ft *)&getopt, &context) == SASL_OK) {
getopt(context, NULL, "log_level", &log_level, NULL);
getopt(context, NULL, "auto_transition", &auto_trans, NULL);
getopt(context, NULL, "mech_list", &mlist, NULL);
}
serverconn->sparams->log_level = log_level ? atoi(log_level) : SASL_LOG_ERR;
serverconn->sparams->utils = utils;
if (auto_trans &&
(*auto_trans == '1' || *auto_trans == 'y' || *auto_trans == 't' ||
(*auto_trans == 'o' && auto_trans[1] == 'n') ||
!strcmp(auto_trans, "noplain")) &&
sasl_auxprop_store(NULL, NULL, NULL) == SASL_OK) {
serverconn->sparams->transition = &_sasl_transition;
}
/* if we have a mech_list, create ordered list of avail mechs for this conn */
if (mlist) {
const char *cp;
mechanism_t *mptr, *tail = NULL;
while (*mlist) {
/* find end of current mech name */
for (cp = mlist; *cp && !isspace((int) *cp); cp++);
/* search for mech name in loaded plugins */
for (mptr = mechlist->mech_list; mptr; mptr = mptr->next) {
const sasl_server_plug_t *plug = mptr->m.plug;
if (_sasl_is_equal_mech(mlist, plug->mech_name, (size_t) (cp - mlist), &plus)) {
/* found a match */
break;
}
}
if (mptr) {
mechanism_t *new = sasl_ALLOC(sizeof(mechanism_t));
if (!new) return SASL_NOMEM;
memcpy(&new->m, &mptr->m, sizeof(server_sasl_mechanism_t));
new->next = NULL;
if (!serverconn->mech_list) {
serverconn->mech_list = new;
tail = serverconn->mech_list;
}
else {
tail->next = new;
tail = new;
}
serverconn->mech_length++;
}
/* find next mech name */
mlist = cp;
while (*mlist && isspace((int) *mlist)) mlist++;
}
}
else {
serverconn->mech_list = mechlist->mech_list;
serverconn->mech_length = mechlist->mech_length;
}
serverconn->sparams->canon_user = &_sasl_canon_user_lookup;
serverconn->sparams->props = serverconn->base.props;
serverconn->sparams->flags = flags;
if(result == SASL_OK) return SASL_OK;
done_error:
_sasl_conn_dispose(*pconn);
sasl_FREE(*pconn);
*pconn = NULL;
return result;
}
/*
* The rule is:
* IF mech strength + external strength < min ssf THEN FAIL.
* We also have to look at the security properties and make sure
* that this mechanism has everything we want.
*/
static int mech_permitted(sasl_conn_t *conn,
mechanism_t *mech)
{
sasl_server_conn_t *s_conn = (sasl_server_conn_t *)conn;
const sasl_server_plug_t *plug;
int ret;
int myflags;
context_list_t *cur;
context_list_t *mech_context_list_entry = NULL;
void *context = NULL;
sasl_ssf_t minssf = 0;
if(!conn) return SASL_NOMECH;
if(! mech || ! mech->m.plug) {
PARAMERROR(conn);
return SASL_NOMECH;
}
plug = mech->m.plug;
/* setup parameters for the call to mech_avail */
s_conn->sparams->serverFQDN=conn->serverFQDN;
s_conn->sparams->service=conn->service;
s_conn->sparams->user_realm=s_conn->user_realm;
s_conn->sparams->props=conn->props;
s_conn->sparams->external_ssf=conn->external.ssf;
/* Check if we have banished this one already */
for (cur = s_conn->mech_contexts; cur; cur=cur->next) {
if (cur->mech == mech) {
/* If it's not mech_avail'd, then stop now */
if (!cur->context) {
return SASL_NOMECH;
} else {
context = cur->context;
mech_context_list_entry = cur;
}
break;
}
}
if (conn->props.min_ssf < conn->external.ssf) {
minssf = 0;
} else {
minssf = conn->props.min_ssf - conn->external.ssf;
}
/* Generic mechanism */
if (plug->max_ssf < minssf) {
sasl_seterror(conn, SASL_NOLOG,
"mech %s is too weak", plug->mech_name);
return SASL_TOOWEAK; /* too weak */
}
if (plug->mech_avail
&& (ret = plug->mech_avail(plug->glob_context,
s_conn->sparams,
(void **)&context)) != SASL_OK ) {
if (ret == SASL_NOMECH) {
/* Mark this mech as no good for this connection */
cur = sasl_ALLOC(sizeof(context_list_t));
if (!cur) {
MEMERROR(conn);
return SASL_NOMECH;
}
cur->context = NULL;
cur->mech = mech;
cur->next = s_conn->mech_contexts;
s_conn->mech_contexts = cur;
}
/* SASL_NOTDONE might also get us here */
/* Error should be set by mech_avail call */
return SASL_NOMECH;
} else if (context) {
if (mech_context_list_entry != NULL) {
/* Update the context. It shouldn't have changed, but who knows */
mech_context_list_entry->context = context;
} else {
/* Save this context */
cur = sasl_ALLOC(sizeof(context_list_t));
if (!cur) {
MEMERROR(conn);
return SASL_NOMECH;
}
cur->context = context;
cur->mech = mech;
cur->next = s_conn->mech_contexts;
s_conn->mech_contexts = cur;
}
}
/* Generic mechanism */
if (plug->max_ssf < minssf) {
sasl_seterror(conn, SASL_NOLOG, "too weak");
return SASL_TOOWEAK; /* too weak */
}
/* if there are no users in the secrets database we can't use this
mechanism */
if (mech->m.condition == SASL_NOUSER) {
sasl_seterror(conn, 0, "no users in secrets db");
return SASL_NOMECH;
}
/* Can it meet our features? */
if ((conn->flags & SASL_NEED_PROXY) &&
!(plug->features & SASL_FEAT_ALLOWS_PROXY)) {
return SASL_NOMECH;
}
if ((conn->flags & SASL_NEED_HTTP) &&
!(plug->features & SASL_FEAT_SUPPORTS_HTTP)) {
return SASL_NOMECH;
}
/* security properties---if there are any flags that differ and are
in what the connection are requesting, then fail */
/* special case plaintext */
myflags = conn->props.security_flags;
/* if there's an external layer this is no longer plaintext */
if ((conn->props.min_ssf <= conn->external.ssf) &&
(conn->external.ssf > 1)) {
myflags &= ~SASL_SEC_NOPLAINTEXT;
}
/* do we want to special case SASL_SEC_PASS_CREDENTIALS? nah.. */
if ((myflags &= (myflags ^ plug->security_flags)) != 0) {
sasl_seterror(conn, SASL_NOLOG,
"security flags do not match required");
return (myflags & SASL_SEC_NOPLAINTEXT) ? SASL_ENCRYPT : SASL_NOMECH;
}
/* Check Features */
if (plug->features & SASL_FEAT_GETSECRET) {
/* We no longer support sasl_server_{get,put}secret */
sasl_seterror(conn, 0,
"mech %s requires unprovided secret facility",
plug->mech_name);
return SASL_NOMECH;
}
return SASL_OK;
}
/*
* make the authorization
*
*/
static int do_authorization(sasl_server_conn_t *s_conn)
{
int ret;
sasl_authorize_t *authproc;
void *auth_context;
/* now let's see if authname is allowed to proxy for username! */
/* check the proxy callback */
if (_sasl_getcallback(&s_conn->base, SASL_CB_PROXY_POLICY,
(sasl_callback_ft *)&authproc, &auth_context) != SASL_OK) {
INTERROR(&s_conn->base, SASL_NOAUTHZ);
}
ret = authproc(&(s_conn->base), auth_context,
s_conn->base.oparams.user, s_conn->base.oparams.ulen,
s_conn->base.oparams.authid, s_conn->base.oparams.alen,
s_conn->user_realm,
(s_conn->user_realm ? (unsigned) strlen(s_conn->user_realm) : 0),
s_conn->sparams->propctx);
RETURN(&s_conn->base, ret);
}
/* start a mechanism exchange within a connection context
* mech -- the mechanism name client requested
* clientin -- client initial response (NUL terminated), NULL if empty
* clientinlen -- length of initial response
* serverout -- initial server challenge, NULL if done
* (library handles freeing this string)
* serveroutlen -- length of initial server challenge
* output:
* pconn -- the connection negotiation state on success
*
* Same returns as sasl_server_step() or
* SASL_NOMECH if mechanism not available.
*/
int sasl_server_start(sasl_conn_t *conn,
const char *mech,
const char *clientin,
unsigned clientinlen,
const char **serverout,
unsigned *serveroutlen)
{
sasl_server_conn_t *s_conn=(sasl_server_conn_t *) conn;
int result;
context_list_t *cur, **prev;
mechanism_t *m;
size_t mech_len;
int plus = 0;
if (_sasl_server_active==0) return SASL_NOTINIT;
/* check parameters */
if(!conn) return SASL_BADPARAM;
if (!mech || ((clientin == NULL) && (clientinlen > 0)))
PARAMERROR(conn);
if (serverout) *serverout = NULL;
if (serveroutlen) *serveroutlen = 0;
/* make sure mech is valid mechanism
if not return appropriate error */
m = s_conn->mech_list;
mech_len = strlen(mech);
while (m != NULL) {
if (_sasl_is_equal_mech(mech, m->m.plug->mech_name, mech_len, &plus)) {
break;
}
m = m->next;
}
if (m == NULL) {
sasl_seterror(conn, 0, "Couldn't find mech %s", mech);
result = SASL_NOMECH;
goto done;
}
/* Make sure that we're willing to use this mech */
if ((result = mech_permitted(conn, m)) != SASL_OK) {
goto done;
}
if (m->m.condition == SASL_CONTINUE) {
sasl_server_plug_init_t *entry_point;
void *library = NULL;
sasl_server_plug_t *pluglist;
int version, plugcount;
int l = 0;
/* need to load this plugin */
result = _sasl_get_plugin(m->m.f,
_sasl_find_verifyfile_callback(global_callbacks.callbacks),
&library);
if (result == SASL_OK) {
result = _sasl_locate_entry(library, "sasl_server_plug_init",
(void **)&entry_point);
}
if (result == SASL_OK) {
result = entry_point(mechlist->utils, SASL_SERVER_PLUG_VERSION,
&version, &pluglist, &plugcount);
}
if (result == SASL_OK) {
/* find the correct mechanism in this plugin */
for (l = 0; l < plugcount; l++) {
if (!strcasecmp(pluglist[l].mech_name,
m->m.plug->mech_name)) break;
}
if (l == plugcount) {
result = SASL_NOMECH;
}
}
if (result == SASL_OK) {
/* check that the parameters are the same */
if ((pluglist[l].max_ssf != m->m.plug->max_ssf) ||
(pluglist[l].security_flags != m->m.plug->security_flags)) {
_sasl_log(conn, SASL_LOG_ERR,
"%s: security parameters don't match mechlist file",
pluglist[l].mech_name);
result = SASL_NOMECH;
}
}
if (result == SASL_OK) {
/* copy mechlist over */
sasl_FREE((sasl_server_plug_t *) m->m.plug);
m->m.plug = &pluglist[l];
m->m.condition = SASL_OK;
}
if (result != SASL_OK) {
/* The library will eventually be freed, don't sweat it */
RETURN(conn, result);
}
}
if (conn->context) {
s_conn->mech->m.plug->mech_dispose(conn->context,
s_conn->sparams->utils);
conn->context = NULL;
}
/* We used to setup sparams HERE, but now it's done
inside of mech_permitted (which is called above) */
prev = &s_conn->mech_contexts;
for (cur = *prev; cur; prev=&cur->next,cur=cur->next) {
if (cur->mech == m) {
if (!cur->context) {
sasl_seterror(conn, 0,
"Got past mech_permitted with a disallowed mech!");
return SASL_NOMECH;
}
/* If we find it, we need to pull cur out of the
list so it won't be freed later! */
*prev = cur->next;
conn->context = cur->context;
sasl_FREE(cur);
break;
}
}
s_conn->mech = m;
if (!conn->context) {
/* Note that we don't hand over a new challenge */
result = s_conn->mech->m.plug->mech_new(s_conn->mech->m.plug->glob_context,
s_conn->sparams,
NULL,
0,
&(conn->context));
} else {
/* the work was already done by mech_avail! */
result = SASL_OK;
}
if (result == SASL_OK) {
if (clientin) {
if (s_conn->mech->m.plug->features & SASL_FEAT_SERVER_FIRST) {
/* Remote sent first, but mechanism does not support it.
* RFC 2222 says we fail at this point. */
sasl_seterror(conn,
0,
"Remote sent first but mech does not allow it.");
result = SASL_BADPROT;
} else {
/* Mech wants client-first, so let them have it */
result = sasl_server_step(conn,
clientin,
clientinlen,
serverout,
serveroutlen);
}
} else {
if (s_conn->mech->m.plug->features & SASL_FEAT_WANT_CLIENT_FIRST) {
/* Mech wants client first anyway, so we should do that */
if (serverout) *serverout = "";
if (serveroutlen) *serveroutlen = 0;
result = SASL_CONTINUE;
} else {
/* Mech wants server-first, so let them have it */
result = sasl_server_step(conn,
clientin,
clientinlen,
serverout,
serveroutlen);
}
}
}
done:
if ( result != SASL_OK
&& result != SASL_CONTINUE
&& result != SASL_INTERACT) {
if (conn->context) {
s_conn->mech->m.plug->mech_dispose(conn->context,
s_conn->sparams->utils);
conn->context = NULL;
}
conn->oparams.doneflag = 0;
}
RETURN(conn,result);
}
/* perform one step of the SASL exchange
* clientinlen & clientin -- client data
* NULL on first step if no optional client step
* serveroutlen & serverout -- set to the server data to transmit
* to the client in the next step
* (library handles freeing this)
*
* returns:
* SASL_OK -- exchange is complete.
* SASL_CONTINUE -- indicates another step is necessary.
* SASL_TRANS -- entry for user exists, but not for mechanism
* and transition is possible
* SASL_BADPARAM -- service name needed
* SASL_BADPROT -- invalid input from client
* ...
*/
int sasl_server_step(sasl_conn_t *conn,
const char *clientin,
unsigned clientinlen,
const char **serverout,
unsigned *serveroutlen)
{
int ret;
sasl_server_conn_t *s_conn = (sasl_server_conn_t *) conn; /* cast */
/* check parameters */
if (_sasl_server_active==0) return SASL_NOTINIT;
if (!conn) return SASL_BADPARAM;
if ((clientin==NULL) && (clientinlen>0))
PARAMERROR(conn);
/* If we've already done the last send, return! */
if (s_conn->sent_last == 1) {
return SASL_OK;
}
/* Don't do another step if the plugin told us that we're done */
if (conn->oparams.doneflag) {
_sasl_log(conn, SASL_LOG_ERR, "attempting server step after doneflag");
return SASL_FAIL;
}
if (serverout) *serverout = NULL;
if (serveroutlen) *serveroutlen = 0;
ret = s_conn->mech->m.plug->mech_step(conn->context,
s_conn->sparams,
clientin,
clientinlen,
serverout,
serveroutlen,
&conn->oparams);
if (ret == SASL_OK) {
ret = do_authorization(s_conn);
}
if (ret == SASL_OK) {
/* if we're done, we need to watch out for the following:
* 1. the mech does server-send-last
* 2. the protocol does not
*
* in this case, return SASL_CONTINUE and remember we are done.
*/
if(*serverout && !(conn->flags & SASL_SUCCESS_DATA)) {
s_conn->sent_last = 1;
ret = SASL_CONTINUE;
}
if(!conn->oparams.maxoutbuf) {
conn->oparams.maxoutbuf = conn->props.maxbufsize;
}
/* Validate channel bindings */
switch (conn->oparams.cbindingdisp) {
case SASL_CB_DISP_NONE:
if (SASL_CB_CRITICAL(s_conn->sparams)) {
sasl_seterror(conn, 0,
"server requires channel binding but client provided none");
ret = SASL_BADBINDING;
}
break;
case SASL_CB_DISP_WANT:
if (SASL_CB_PRESENT(s_conn->sparams)) {
sasl_seterror(conn, 0,
"client incorrectly assumed server had no channel binding");
ret = SASL_BADAUTH;
}
break;
case SASL_CB_DISP_USED:
if (!SASL_CB_PRESENT(s_conn->sparams)) {
sasl_seterror(conn, 0,
"client provided channel binding but server had none");
ret = SASL_BADBINDING;
} else if (strcmp(conn->oparams.cbindingname,
s_conn->sparams->cbinding->name) != 0) {
sasl_seterror(conn, 0,
"client channel binding %s does not match server %s",
conn->oparams.cbindingname, s_conn->sparams->cbinding->name);
ret = SASL_BADBINDING;
}
break;
}
if (ret == SASL_OK &&
(conn->oparams.user == NULL || conn->oparams.authid == NULL)) {
sasl_seterror(conn, 0,
"mech did not call canon_user for both authzid " \
"and authid");
ret = SASL_BADPROT;
}
}
if ( ret != SASL_OK
&& ret != SASL_CONTINUE
&& ret != SASL_INTERACT) {
if (conn->context) {
s_conn->mech->m.plug->mech_dispose(conn->context,
s_conn->sparams->utils);
conn->context = NULL;
}
conn->oparams.doneflag = 0;
}
RETURN(conn, ret);
}
/* returns the length of all the mechanisms
* added up
*/
static unsigned mech_names_len(mechanism_t *mech_list)
{
mechanism_t *listptr;
unsigned result = 0;
for (listptr = mech_list;
listptr;
listptr = listptr->next)
result += (unsigned) strlen(listptr->m.plug->mech_name);
return result;
}
/* This returns a list of mechanisms in a NUL-terminated string
*
* The default behavior is to separate with spaces if sep == NULL
*/
int _sasl_server_listmech(sasl_conn_t *conn,
const char *user __attribute__((unused)),
const char *prefix,
const char *sep,
const char *suffix,
const char **result,
unsigned *plen,
int *pcount)
{
sasl_server_conn_t *s_conn = (sasl_server_conn_t *) conn; /* cast */
int lup;
mechanism_t *listptr;
int ret;
size_t resultlen;
int flag;
const char *mysep;
/* if there hasn't been a sasl_sever_init() fail */
if (_sasl_server_active==0) return SASL_NOTINIT;
if (!conn) return SASL_BADPARAM;
if (conn->type != SASL_CONN_SERVER) PARAMERROR(conn);
if (! result)
PARAMERROR(conn);
if (plen != NULL)
*plen = 0;
if (pcount != NULL)
*pcount = 0;
if (sep) {
mysep = sep;
} else {
mysep = " ";
}
if (!s_conn->mech_list || s_conn->mech_length <= 0)
INTERROR(conn, SASL_NOMECH);
resultlen = (prefix ? strlen(prefix) : 0)
+ (strlen(mysep) * (s_conn->mech_length - 1) * 2)
+ (mech_names_len(s_conn->mech_list) * 2) /* including -PLUS variant */
+ (s_conn->mech_length * (sizeof("-PLUS") - 1))
+ (suffix ? strlen(suffix) : 0)
+ 1;
ret = _buf_alloc(&conn->mechlist_buf,
&conn->mechlist_buf_len, resultlen);
if(ret != SASL_OK) MEMERROR(conn);
if (prefix)
strcpy (conn->mechlist_buf,prefix);
else
*(conn->mechlist_buf) = '\0';
listptr = s_conn->mech_list;
flag = 0;
/* make list */
for (lup = 0; lup < s_conn->mech_length; lup++) {
/* currently, we don't use the "user" parameter for anything */
if (mech_permitted(conn, listptr) == SASL_OK) {
/*
* If the server would never succeed in the authentication of
* the non-PLUS-variant due to policy reasons, it MUST advertise
* only the PLUS-variant.
*/
if ((listptr->m.plug->features & SASL_FEAT_CHANNEL_BINDING) &&
SASL_CB_PRESENT(s_conn->sparams)) {
if (pcount != NULL) {
(*pcount)++;
}
if (flag) {
strcat(conn->mechlist_buf, mysep);
} else {
flag = 1;
}
strcat(conn->mechlist_buf, listptr->m.plug->mech_name);
strcat(conn->mechlist_buf, "-PLUS");
}
/*
* If the server cannot support channel binding, it SHOULD
* advertise only the non-PLUS-variant. Here, supporting channel
* binding means the underlying SASL mechanism supports it and
* the application has set some channel binding data.
*/
if (!SASL_CB_PRESENT(s_conn->sparams) ||
!SASL_CB_CRITICAL(s_conn->sparams)) {
if (pcount != NULL) {
(*pcount)++;
}
if (flag) {
strcat(conn->mechlist_buf, mysep);
} else {
flag = 1;
}
strcat(conn->mechlist_buf, listptr->m.plug->mech_name);
}
}
listptr = listptr->next;
}
if (suffix)
strcat(conn->mechlist_buf,suffix);
if (plen!=NULL)
*plen = (unsigned) strlen(conn->mechlist_buf);
*result = conn->mechlist_buf;
return SASL_OK;
}
sasl_string_list_t *_sasl_server_mechs(void)
{
mechanism_t *listptr;
sasl_string_list_t *retval = NULL, *next=NULL;
if(!_sasl_server_active) return NULL;
/* make list */
for (listptr = mechlist->mech_list; listptr; listptr = listptr->next) {
next = sasl_ALLOC(sizeof(sasl_string_list_t));
if(!next && !retval) return NULL;
else if(!next) {
next = retval->next;
do {
sasl_FREE(retval);
retval = next;
next = retval->next;
} while(next);
return NULL;
}
next->d = listptr->m.plug->mech_name;
if(!retval) {
next->next = NULL;
retval = next;
} else {
next->next = retval;
retval = next;
}
}
return retval;
}
#define EOSTR(s,n) (((s)[n] == '\0') || ((s)[n] == ' ') || ((s)[n] == '\t'))
static int is_mech(const char *t, const char *m)
{
size_t sl = strlen(m);
return ((!strncasecmp(m, t, sl)) && EOSTR(t, sl));
}
/* returns OK if it's valid */
static int _sasl_checkpass(sasl_conn_t *conn,
const char *user,
unsigned userlen,
const char *pass,
unsigned passlen)
{
sasl_server_conn_t *s_conn = (sasl_server_conn_t *) conn;
int result;
sasl_getopt_t *getopt;
sasl_server_userdb_checkpass_t *checkpass_cb;
void *context;
const char *mlist = NULL, *mech = NULL;
struct sasl_verify_password_s *v;
const char *service = conn->service;
if (!userlen) userlen = (unsigned) strlen(user);
if (!passlen) passlen = (unsigned) strlen(pass);
/* call userdb callback function, if available */
result = _sasl_getcallback(conn, SASL_CB_SERVER_USERDB_CHECKPASS,
(sasl_callback_ft *)&checkpass_cb, &context);
if(result == SASL_OK && checkpass_cb) {
result = checkpass_cb(conn, context, user, pass, passlen,
s_conn->sparams->propctx);
if(result == SASL_OK)
return SASL_OK;
}
/* figure out how to check (i.e. auxprop or saslauthd or pwcheck) */
if (_sasl_getcallback(conn, SASL_CB_GETOPT, (sasl_callback_ft *)&getopt, &context)
== SASL_OK) {
getopt(context, NULL, "pwcheck_method", &mlist, NULL);
}
if(!mlist) mlist = DEFAULT_CHECKPASS_MECH;
result = SASL_NOMECH;
mech = mlist;
while (*mech && result != SASL_OK) {
for (v = _sasl_verify_password; v->name; v++) {
if(is_mech(mech, v->name)) {
result = v->verify(conn, user, pass, service,
s_conn->user_realm);
break;
}
}
if (result != SASL_OK) {
/* skip to next mech in list */
while (*mech && !isspace((int) *mech)) mech++;
while (*mech && isspace((int) *mech)) mech++;
}
else if (!is_mech(mech, "auxprop") && s_conn->sparams->transition) {
s_conn->sparams->transition(conn, pass, passlen);
}
}
if (result == SASL_NOMECH) {
/* no mechanism available ?!? */
_sasl_log(conn, SASL_LOG_ERR, "unknown password verifier(s) %s", mlist);
}
if (result != SASL_OK)
sasl_seterror(conn, SASL_NOLOG, "checkpass failed");
RETURN(conn, result);
}
/* check if a plaintext password is valid
* if user is NULL, check if plaintext passwords are enabled
* inputs:
* user -- user to query in current user_domain
* userlen -- length of username, 0 = strlen(user)
* pass -- plaintext password to check
* passlen -- length of password, 0 = strlen(pass)
* returns
* SASL_OK -- success
* SASL_NOMECH -- mechanism not supported
* SASL_NOVERIFY -- user found, but no verifier
* SASL_NOUSER -- user not found
*/
int sasl_checkpass(sasl_conn_t *conn,
const char *user,
unsigned userlen,
const char *pass,
unsigned passlen)
{
int result;
if (_sasl_server_active==0) return SASL_NOTINIT;
/* check if it's just a query if we are enabled */
if (!user)
return SASL_OK;
if (!conn) return SASL_BADPARAM;
/* check params */
if (pass == NULL)
PARAMERROR(conn);
/* canonicalize the username */
result = _sasl_canon_user(conn, user, userlen,
SASL_CU_AUTHID | SASL_CU_AUTHZID,
&(conn->oparams));
if(result != SASL_OK) RETURN(conn, result);
user = conn->oparams.user;
/* Check the password and lookup additional properties */
result = _sasl_checkpass(conn, user, userlen, pass, passlen);
/* Do authorization */
if(result == SASL_OK) {
result = do_authorization((sasl_server_conn_t *)conn);
}
RETURN(conn,result);
}
/* check if a user exists on server
* conn -- connection context (may be NULL, used to hold last error)
* service -- registered name of the service using SASL (e.g. "imap")
* user_realm -- permits multiple user realms on server, NULL = default
* user -- NUL terminated user name
*
* returns:
* SASL_OK -- success
* SASL_DISABLED -- account disabled [FIXME: currently not detected]
* SASL_NOUSER -- user not found
* SASL_NOVERIFY -- user found, but no usable mechanism [FIXME: not supported]
* SASL_NOMECH -- no mechanisms enabled
* SASL_UNAVAIL -- remote authentication server unavailable, try again later
*/
int sasl_user_exists(sasl_conn_t *conn,
const char *service,
const char *user_realm,
const char *user)
{
int result=SASL_NOMECH;
const char *mlist = NULL, *mech = NULL;
void *context;
sasl_getopt_t *getopt;
struct sasl_verify_password_s *v;
/* check params */
if (_sasl_server_active==0) return SASL_NOTINIT;
if (!conn) return SASL_BADPARAM;
if (!user || conn->type != SASL_CONN_SERVER)
PARAMERROR(conn);
if(!service) service = conn->service;
/* figure out how to check (i.e. auxprop or saslauthd or pwcheck) */
if (_sasl_getcallback(conn, SASL_CB_GETOPT, (sasl_callback_ft *)&getopt, &context)
== SASL_OK) {
getopt(context, NULL, "pwcheck_method", &mlist, NULL);
}
if(!mlist) mlist = DEFAULT_CHECKPASS_MECH;
result = SASL_NOMECH;
mech = mlist;
while (*mech && result != SASL_OK) {
for (v = _sasl_verify_password; v->name; v++) {
if(is_mech(mech, v->name)) {
result = v->verify(conn, user, NULL, service, user_realm);
break;
}
}
if (result != SASL_OK) {
/* skip to next mech in list */
while (*mech && !isspace((int) *mech)) mech++;
while (*mech && isspace((int) *mech)) mech++;
}
}
/* Screen out the SASL_BADPARAM response
* we'll get from not giving a password */
if (result == SASL_BADPARAM) {
result = SASL_OK;
}
if (result == SASL_NOMECH) {
/* no mechanism available ?!? */
_sasl_log(conn, SASL_LOG_ERR, "no plaintext password verifier?");
sasl_seterror(conn, SASL_NOLOG, "no plaintext password verifier?");
}
RETURN(conn, result);
}
/* check if an apop exchange is valid
* (note this is an optional part of the SASL API)
* if challenge is NULL, just check if APOP is enabled
* inputs:
* challenge -- challenge which was sent to client
* challen -- length of challenge, 0 = strlen(challenge)
* response -- client response, "<user> <digest>" (RFC 1939)
* resplen -- length of response, 0 = strlen(response)
* returns
* SASL_OK -- success
* SASL_BADAUTH -- authentication failed
* SASL_BADPARAM -- missing challenge
* SASL_BADPROT -- protocol error (e.g., response in wrong format)
* SASL_NOVERIFY -- user found, but no verifier
* SASL_NOMECH -- mechanism not supported
* SASL_NOUSER -- user not found
*/
int sasl_checkapop(sasl_conn_t *conn,
#ifdef DO_SASL_CHECKAPOP
const char *challenge,
unsigned challen __attribute__((unused)),
const char *response,
unsigned resplen __attribute__((unused)))
#else
const char *challenge __attribute__((unused)),
unsigned challen __attribute__((unused)),
const char *response __attribute__((unused)),
unsigned resplen __attribute__((unused)))
#endif
{
#ifdef DO_SASL_CHECKAPOP
sasl_server_conn_t *s_conn = (sasl_server_conn_t *) conn;
char *user, *user_end;
const char *password_request[] = { SASL_AUX_PASSWORD, NULL };
size_t user_len;
int result;
if (_sasl_server_active==0)
return SASL_NOTINIT;
/* check if it's just a query if we are enabled */
if(!challenge)
return SASL_OK;
/* check params */
if (!conn) return SASL_BADPARAM;
if (!response)
PARAMERROR(conn);
/* Parse out username and digest.
*
* Per RFC 1939, response must be "<user> <digest>", where
* <digest> is a 16-octet value which is sent in hexadecimal
* format, using lower-case ASCII characters.
*/
user_end = strrchr(response, ' ');
if (!user_end || strspn(user_end + 1, "0123456789abcdef") != 32)
{
sasl_seterror(conn, 0, "Bad Digest");
RETURN(conn,SASL_BADPROT);
}
user_len = (size_t)(user_end - response);
user = sasl_ALLOC(user_len + 1);
memcpy(user, response, user_len);
user[user_len] = '\0';
result = prop_request(s_conn->sparams->propctx, password_request);
if(result != SASL_OK)
{
sasl_FREE(user);
RETURN(conn, result);
}
/* erase the plaintext password */
s_conn->sparams->utils->prop_erase(s_conn->sparams->propctx,
password_request[0]);
/* canonicalize the username and lookup any associated properties */
result = _sasl_canon_user_lookup (conn,
user,
user_len,
SASL_CU_AUTHID | SASL_CU_AUTHZID,
&(conn->oparams));
sasl_FREE(user);
if(result != SASL_OK) RETURN(conn, result);
/* Do APOP verification */
result = _sasl_auxprop_verify_apop(conn, conn->oparams.authid,
challenge, user_end + 1, s_conn->user_realm);
/* Do authorization */
if(result == SASL_OK) {
result = do_authorization((sasl_server_conn_t *)conn);
} else {
/* If verification failed, we don't want to encourage getprop to work */
conn->oparams.user = NULL;
conn->oparams.authid = NULL;
}
RETURN(conn, result);
#else /* sasl_checkapop was disabled at compile time */
sasl_seterror(conn, SASL_NOLOG,
"sasl_checkapop called, but was disabled at compile time");
RETURN(conn, SASL_NOMECH);
#endif /* DO_SASL_CHECKAPOP */
}
/* It would be nice if we can show other information like Author, Company, Year, plugin version */
static void
_sasl_print_mechanism (
server_sasl_mechanism_t *m,
sasl_info_callback_stage_t stage,
void *rock __attribute__((unused))
)
{
char delimiter;
if (stage == SASL_INFO_LIST_START) {
printf ("List of server plugins follows\n");
return;
} else if (stage == SASL_INFO_LIST_END) {
return;
}
/* Process the mechanism */
printf ("Plugin \"%s\" ", m->plugname);
switch (m->condition) {
case SASL_OK:
printf ("[loaded]");
break;
case SASL_CONTINUE:
printf ("[delayed]");
break;
case SASL_NOUSER:
printf ("[no users]");
break;
default:
printf ("[unknown]");
break;
}
printf (", \tAPI version: %d\n", m->version);
if (m->plug != NULL) {
printf ("\tSASL mechanism: %s, best SSF: %d, supports setpass: %s\n",
m->plug->mech_name,
m->plug->max_ssf,
(m->plug->setpass != NULL) ? "yes" : "no"
);
printf ("\tsecurity flags:");
delimiter = ' ';
if (m->plug->security_flags & SASL_SEC_NOANONYMOUS) {
printf ("%cNO_ANONYMOUS", delimiter);
delimiter = '|';
}
if (m->plug->security_flags & SASL_SEC_NOPLAINTEXT) {
printf ("%cNO_PLAINTEXT", delimiter);
delimiter = '|';
}
if (m->plug->security_flags & SASL_SEC_NOACTIVE) {
printf ("%cNO_ACTIVE", delimiter);
delimiter = '|';
}
if (m->plug->security_flags & SASL_SEC_NODICTIONARY) {
printf ("%cNO_DICTIONARY", delimiter);
delimiter = '|';
}
if (m->plug->security_flags & SASL_SEC_FORWARD_SECRECY) {
printf ("%cFORWARD_SECRECY", delimiter);
delimiter = '|';
}
if (m->plug->security_flags & SASL_SEC_PASS_CREDENTIALS) {
printf ("%cPASS_CREDENTIALS", delimiter);
delimiter = '|';
}
if (m->plug->security_flags & SASL_SEC_MUTUAL_AUTH) {
printf ("%cMUTUAL_AUTH", delimiter);
delimiter = '|';
}
printf ("\n\tfeatures:");
delimiter = ' ';
if (m->plug->features & SASL_FEAT_WANT_CLIENT_FIRST) {
printf ("%cWANT_CLIENT_FIRST", delimiter);
delimiter = '|';
}
if (m->plug->features & SASL_FEAT_SERVER_FIRST) {
printf ("%cSERVER_FIRST", delimiter);
delimiter = '|';
}
if (m->plug->features & SASL_FEAT_ALLOWS_PROXY) {
printf ("%cPROXY_AUTHENTICATION", delimiter);
delimiter = '|';
}
if (m->plug->features & SASL_FEAT_DONTUSE_USERPASSWD) {
printf ("%cDONTUSE_USERPASSWD", delimiter);
delimiter = '|';
}
if (m->plug->features & SASL_FEAT_NEEDSERVERFQDN) {
printf ("%cNEED_SERVER_FQDN", delimiter);
delimiter = '|';
}
/* Is this one used? */
if (m->plug->features & SASL_FEAT_SERVICE) {
printf ("%cSERVICE", delimiter);
delimiter = '|';
}
if (m->plug->features & SASL_FEAT_GETSECRET) {
printf ("%cNEED_GETSECRET", delimiter);
delimiter = '|';
}
if (m->plug->features & SASL_FEAT_GSS_FRAMING) {
printf ("%cGSS_FRAMING", delimiter);
delimiter = '|';
}
if (m->plug->features & SASL_FEAT_CHANNEL_BINDING) {
printf ("%cCHANNEL_BINDING", delimiter);
delimiter = '|';
}
if (m->plug->features & SASL_FEAT_SUPPORTS_HTTP) {
printf ("%cSUPPORTS_HTTP", delimiter);
delimiter = '|';
}
}
if (m->f) {
printf ("\n\twill be loaded from \"%s\"", m->f);
}
printf ("\n");
}
/* Dump information about available server plugins (separate functions should be
used for canon and auxprop plugins */
int sasl_server_plugin_info (
const char *c_mech_list, /* space separated mechanism list or NULL for ALL */
sasl_server_info_callback_t *info_cb,
void *info_cb_rock
)
{
mechanism_t *m;
server_sasl_mechanism_t plug_data;
char * cur_mech;
char *mech_list = NULL;
char * p;
if (info_cb == NULL) {
info_cb = _sasl_print_mechanism;
}
if (mechlist != NULL) {
info_cb (NULL, SASL_INFO_LIST_START, info_cb_rock);
if (c_mech_list == NULL) {
m = mechlist->mech_list; /* m point to beginning of the list */
while (m != NULL) {
memcpy (&plug_data, &m->m, sizeof(plug_data));
info_cb (&plug_data, SASL_INFO_LIST_MECH, info_cb_rock);
m = m->next;
}
} else {
mech_list = strdup(c_mech_list);
cur_mech = mech_list;
while (cur_mech != NULL) {
p = strchr (cur_mech, ' ');
if (p != NULL) {
*p = '\0';
p++;
}
m = mechlist->mech_list; /* m point to beginning of the list */
while (m != NULL) {
if (strcasecmp (cur_mech, m->m.plug->mech_name) == 0) {
memcpy (&plug_data, &m->m, sizeof(plug_data));
info_cb (&plug_data, SASL_INFO_LIST_MECH, info_cb_rock);
}
m = m->next;
}
cur_mech = p;
}
free (mech_list);
}
info_cb (NULL, SASL_INFO_LIST_END, info_cb_rock);
return (SASL_OK);
}
return (SASL_NOTINIT);
}
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