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/* libimap library.
* Copyright (C) 2003-2004 Pawel Salek.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
/* imap_authenticate: Attempt to authenticate using either user-specified
* authentication method if specified, or any.
* returns 0 on success */
#include "config.h"
#include <stdio.h>
#include <string.h>
#include "imap-handle.h"
#include "imap-auth.h"
#include "util.h"
#include "imap_private.h"
#include "siobuf.h"
static ImapResult imap_auth_anonymous(ImapMboxHandle* handle);
static ImapResult imap_auth_plain(ImapMboxHandle* handle);
/* ordered from strongest to weakest. Auth anonymous does not really
* belong here, does it? */
static ImapAuthenticator imap_authenticators_arr[] = {
imap_auth_anonymous, /* will be tried only if enabled */
imap_auth_gssapi,
imap_auth_cram,
imap_auth_plain,
imap_auth_login, /* login is deprecated */
NULL
};
ImapResult
imap_authenticate(ImapMboxHandle* handle)
{
ImapAuthenticator* authenticator;
ImapResult r = IMAP_AUTH_UNAVAIL;
g_return_val_if_fail(handle, IMAP_AUTH_UNAVAIL);
if (imap_mbox_is_authenticated(handle) || imap_mbox_is_selected(handle))
return IMAP_SUCCESS;
for(authenticator = imap_authenticators_arr;
*authenticator; authenticator++) {
if ((r = (*authenticator)(handle))
!= IMAP_AUTH_UNAVAIL) {
if (r == IMAP_SUCCESS)
imap_mbox_handle_set_state(handle, IMHS_AUTHENTICATED);
return r;
}
}
imap_mbox_handle_set_msg(handle, "No way to authenticate is known");
return r;
}
/* =================================================================== */
/* AUTHENTICATORS */
/* =================================================================== */
#define SHORT_STRING 64
/* imap_auth_login: Plain LOGIN support */
ImapResult
imap_auth_login(ImapMboxHandle* handle)
{
char q_user[SHORT_STRING], q_pass[SHORT_STRING];
char buf[2*SHORT_STRING+7];
char *user = NULL, *pass = NULL;
ImapResponse rc;
int ok;
if (imap_mbox_handle_can_do(handle, IMCAP_LOGINDISABLED))
return IMAP_AUTH_UNAVAIL;
ok = 0;
if(!ok && handle->user_cb)
handle->user_cb(IME_GET_USER_PASS, handle->user_arg,
"LOGIN", &user, &pass, &ok);
if(!ok || user == NULL || pass == NULL) {
imap_mbox_handle_set_msg(handle, "Authentication cancelled");
return IMAP_AUTH_CANCELLED;
}
imap_quote_string(q_user, sizeof (q_user), user);
imap_quote_string(q_pass, sizeof (q_pass), pass);
g_free(user); g_free(pass); /* FIXME: clean passwd first */
g_snprintf (buf, sizeof (buf), "LOGIN %s %s", q_user, q_pass);
rc = imap_cmd_exec(handle, buf);
return (rc== IMR_OK) ? IMAP_SUCCESS : IMAP_AUTH_FAILURE;
}
/* =================================================================== */
/* SASL PLAIN RFC-2595 */
/* =================================================================== */
#define WAIT_FOR_PROMPT(rc,handle,cmdno) \
do (rc) = imap_cmd_step((handle), (cmdno)); while((rc) == IMR_UNTAGGED);
static ImapResult
imap_auth_sasl(ImapMboxHandle* handle, ImapCapability cap,
const char *sasl_cmd,
gboolean (*getmsg)(ImapMboxHandle *h, char **msg, int *msglen))
{
char *msg = NULL, *msg64;
ImapResponse rc;
int msglen, msg64len;
unsigned cmdno;
gboolean sasl_ir;
if (!imap_mbox_handle_can_do(handle, cap))
return IMAP_AUTH_UNAVAIL;
sasl_ir = imap_mbox_handle_can_do(handle, IMCAP_SASLIR);
if(!getmsg(handle, &msg, &msglen)) {
imap_mbox_handle_set_msg(handle, "Authentication cancelled");
return IMAP_AUTH_CANCELLED;
}
msg64len = 2*(msglen+2);
msg64 = g_malloc(msg64len);
lit_conv_to_base64(msg64, msg, msglen, msg64len);
g_free(msg);
if(sasl_ir) { /* save one RTT */
ImapCmdTag tag;
if(IMAP_MBOX_IS_DISCONNECTED(handle))
return IMAP_AUTH_UNAVAIL;
cmdno = imap_make_tag(tag);
sio_write(handle->sio, tag, strlen(tag));
sio_write(handle->sio, " ", 1);
sio_write(handle->sio, sasl_cmd, strlen(sasl_cmd));
sio_write(handle->sio, " ", 1);
} else {
int c;
if(imap_cmd_start(handle, sasl_cmd, &cmdno) <0) {
g_free(msg64);
return IMAP_AUTH_FAILURE;
}
imap_handle_flush(handle);
WAIT_FOR_PROMPT(rc,handle,cmdno);
if (rc != IMR_RESPOND) {
g_warning("imap %s: unexpected response.\n", sasl_cmd);
g_free(msg64);
return IMAP_AUTH_FAILURE;
}
while( (c=sio_getc((handle)->sio)) != EOF && c != '\n');
if(c == EOF) {
imap_handle_disconnect(handle);
g_free(msg64);
return IMAP_AUTH_FAILURE;
}
}
sio_write(handle->sio, msg64, strlen(msg64));
sio_write(handle->sio, "\r\n", 2);
g_free(msg64);
imap_handle_flush(handle);
do
rc = imap_cmd_step (handle, cmdno);
while (rc == IMR_UNTAGGED);
return (rc== IMR_OK) ? IMAP_SUCCESS : IMAP_AUTH_FAILURE;
}
static gboolean
getmsg_plain(ImapMboxHandle *h, char **retmsg, int *retmsglen)
{
char *user = NULL, *pass = NULL, *msg;
int ok, userlen, passlen, msglen;
ok = 0;
if(!ok && h->user_cb)
h->user_cb(IME_GET_USER_PASS, h->user_arg,
"LOGIN", &user, &pass, &ok);
if(!ok || user == NULL || pass == NULL)
return 0;
userlen = strlen(user);
passlen = strlen(pass);
msglen = 2*userlen + passlen + 2;
msg = g_malloc(msglen+1);
strcpy(msg, user);
strcpy(msg+userlen+1, user);
strcpy(msg+userlen*2+2, pass);
g_free(user); g_free(pass);
*retmsg = msg;
*retmsglen = msglen;
return 1;
}
static ImapResult
imap_auth_plain(ImapMboxHandle* handle)
{
return imap_auth_sasl(handle, IMCAP_APLAIN, "AUTHENTICATE PLAIN",
getmsg_plain);
}
/* =================================================================== */
/* SASL ANONYMOUS RFC-2245 */
/* =================================================================== */
static gboolean
getmsg_anonymous(ImapMboxHandle *h, char **retmsg, int *retmsglen)
{
int ok = 0;
if(!ok && h->user_cb)
h->user_cb(IME_GET_USER, h->user_arg,
"ANONYMOUS", retmsg, &ok);
if(!ok || *retmsg == NULL)
return 0;
*retmsglen = strlen(*retmsg);
return 1;
}
static ImapResult
imap_auth_anonymous(ImapMboxHandle* handle)
{
if(!handle->enable_anonymous)
return IMAP_AUTH_UNAVAIL;
return imap_auth_sasl(handle, IMCAP_AANONYMOUS, "AUTHENTICATE ANONYMOUS",
getmsg_anonymous);
}
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