/
imap.c
1739 lines (1430 loc) · 47.8 KB
/
imap.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* RFC2195 CRAM-MD5 authentication
* RFC2595 Using TLS with IMAP, POP3 and ACAP
* RFC2831 DIGEST-MD5 authentication
* RFC3501 IMAPv4 protocol
* RFC4422 Simple Authentication and Security Layer (SASL)
* RFC4616 PLAIN authentication
* RFC4959 IMAP Extension for SASL Initial Client Response
* RFC5092 IMAP URL Scheme
*
***************************************************************************/
#include "curl_setup.h"
#ifndef CURL_DISABLE_IMAP
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_UTSNAME_H
#include <sys/utsname.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif
#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
#undef in_addr_t
#define in_addr_t unsigned long
#endif
#include <curl/curl.h>
#include "urldata.h"
#include "sendf.h"
#include "if2ip.h"
#include "hostip.h"
#include "progress.h"
#include "transfer.h"
#include "escape.h"
#include "http.h" /* for HTTP proxy tunnel stuff */
#include "socks.h"
#include "imap.h"
#include "strtoofft.h"
#include "strequal.h"
#include "sslgen.h"
#include "connect.h"
#include "strerror.h"
#include "select.h"
#include "multiif.h"
#include "url.h"
#include "rawstr.h"
#include "curl_sasl.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
/* Local API functions */
static CURLcode imap_parse_url_path(struct connectdata *conn);
static CURLcode imap_regular_transfer(struct connectdata *conn, bool *done);
static CURLcode imap_do(struct connectdata *conn, bool *done);
static CURLcode imap_done(struct connectdata *conn, CURLcode status,
bool premature);
static CURLcode imap_connect(struct connectdata *conn, bool *done);
static CURLcode imap_disconnect(struct connectdata *conn, bool dead);
static CURLcode imap_multi_statemach(struct connectdata *conn, bool *done);
static int imap_getsock(struct connectdata *conn, curl_socket_t *socks,
int numsocks);
static CURLcode imap_doing(struct connectdata *conn, bool *dophase_done);
static CURLcode imap_setup_connection(struct connectdata *conn);
static CURLcode imap_state_upgrade_tls(struct connectdata *conn);
/*
* IMAP protocol handler.
*/
const struct Curl_handler Curl_handler_imap = {
"IMAP", /* scheme */
imap_setup_connection, /* setup_connection */
imap_do, /* do_it */
imap_done, /* done */
ZERO_NULL, /* do_more */
imap_connect, /* connect_it */
imap_multi_statemach, /* connecting */
imap_doing, /* doing */
imap_getsock, /* proto_getsock */
imap_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
imap_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_IMAP, /* defport */
CURLPROTO_IMAP, /* protocol */
PROTOPT_CLOSEACTION | PROTOPT_NEEDSPWD
| PROTOPT_NOURLQUERY /* flags */
};
#ifdef USE_SSL
/*
* IMAPS protocol handler.
*/
const struct Curl_handler Curl_handler_imaps = {
"IMAPS", /* scheme */
imap_setup_connection, /* setup_connection */
imap_do, /* do_it */
imap_done, /* done */
ZERO_NULL, /* do_more */
imap_connect, /* connect_it */
imap_multi_statemach, /* connecting */
imap_doing, /* doing */
imap_getsock, /* proto_getsock */
imap_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
imap_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_IMAPS, /* defport */
CURLPROTO_IMAP | CURLPROTO_IMAPS, /* protocol */
PROTOPT_CLOSEACTION | PROTOPT_SSL | PROTOPT_NEEDSPWD
| PROTOPT_NOURLQUERY /* flags */
};
#endif
#ifndef CURL_DISABLE_HTTP
/*
* HTTP-proxyed IMAP protocol handler.
*/
static const struct Curl_handler Curl_handler_imap_proxy = {
"IMAP", /* scheme */
ZERO_NULL, /* setup_connection */
Curl_http, /* do_it */
Curl_http_done, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_IMAP, /* defport */
CURLPROTO_HTTP, /* protocol */
PROTOPT_NONE /* flags */
};
#ifdef USE_SSL
/*
* HTTP-proxyed IMAPS protocol handler.
*/
static const struct Curl_handler Curl_handler_imaps_proxy = {
"IMAPS", /* scheme */
ZERO_NULL, /* setup_connection */
Curl_http, /* do_it */
Curl_http_done, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_IMAPS, /* defport */
CURLPROTO_HTTP, /* protocol */
PROTOPT_NONE /* flags */
};
#endif
#endif
#ifdef USE_SSL
static void imap_to_imaps(struct connectdata *conn)
{
conn->handler = &Curl_handler_imaps;
}
#else
#define imap_to_imaps(x) Curl_nop_stmt
#endif
/***********************************************************************
*
* imap_sendf()
*
* Sends the formated string as an IMAP command to the server.
*
* Designed to never block.
*/
static CURLcode imap_sendf(struct connectdata *conn, const char *fmt, ...)
{
CURLcode result;
struct imap_conn *imapc = &conn->proto.imapc;
char *taggedfmt;
va_list ap;
va_start(ap, fmt);
/* Calculate the next command ID wrapping at 3 digits */
imapc->cmdid = (imapc->cmdid + 1) % 1000;
/* Calculate the tag based on the connection ID and command ID */
snprintf(imapc->resptag, sizeof(imapc->resptag), "%c%03d",
'A' + (conn->connection_id % 26), imapc->cmdid);
taggedfmt = aprintf("%s %s", imapc->resptag, fmt);
if(!taggedfmt)
return CURLE_OUT_OF_MEMORY;
result = Curl_pp_vsendf(&imapc->pp, taggedfmt, ap);
Curl_safefree(taggedfmt);
va_end(ap);
return result;
}
/***********************************************************************
*
* imap_atom()
*
* Checks the input string for characters that need escaping and returns an
* atom ready for sending to the server.
*
* The returned string needs to be freed.
*
*/
static char* imap_atom(const char* str)
{
const char *p1;
char *p2;
size_t backsp_count = 0;
size_t quote_count = 0;
bool space_exists = FALSE;
size_t newlen = 0;
char *newstr = NULL;
if(!str)
return NULL;
/* Count any unescapped characters */
p1 = str;
while(*p1) {
if(*p1 == '\\')
backsp_count++;
else if(*p1 == '"')
quote_count++;
else if(*p1 == ' ')
space_exists = TRUE;
p1++;
}
/* Does the input contain any unescapped characters? */
if(!backsp_count && !quote_count && !space_exists)
return strdup(str);
/* Calculate the new string length */
newlen = strlen(str) + backsp_count + quote_count + (space_exists ? 2 : 0);
/* Allocate the new string */
newstr = (char *) malloc((newlen + 1) * sizeof(char));
if(!newstr)
return NULL;
/* Surround the string in quotes if necessary */
p2 = newstr;
if(space_exists) {
newstr[0] = '"';
newstr[newlen - 1] = '"';
p2++;
}
/* Copy the string, escaping backslash and quote characters along the way */
p1 = str;
while(*p1) {
if(*p1 == '\\' || *p1 == '"') {
*p2 = '\\';
p2++;
}
*p2 = *p1;
p1++;
p2++;
}
/* Terminate the string */
newstr[newlen] = '\0';
return newstr;
}
/* Function that checks for an ending IMAP status code at the start of the
given string but also detects various capabilities from the CAPABILITY
response including the supported authentication mechanisms. */
static bool imap_endofresp(struct connectdata *conn, char *line, size_t len,
int *resp)
{
struct imap_conn *imapc = &conn->proto.imapc;
const char *id = imapc->resptag;
size_t id_len = strlen(id);
size_t wordlen;
/* Do we have a command response? */
if(len >= id_len + 3) {
if(!memcmp(id, line, id_len) && line[id_len] == ' ') {
*resp = line[id_len + 1]; /* O, N or B */
return TRUE;
}
}
/* Do we have a continuation response? */
if((len == 3 && !memcmp("+", line, 1)) ||
(len >= 2 && !memcmp("+ ", line, 2))) {
*resp = '+';
return TRUE;
}
/* Are we processing CAPABILITY command data? */
if(imapc->state == IMAP_CAPABILITY) {
/* Do we have a valid response? */
if(len >= 2 && !memcmp("* ", line, 2)) {
line += 2;
len -= 2;
/* Loop through the data line */
for(;;) {
while(len &&
(*line == ' ' || *line == '\t' ||
*line == '\r' || *line == '\n')) {
line++;
len--;
}
if(!len)
break;
/* Extract the word */
for(wordlen = 0; wordlen < len && line[wordlen] != ' ' &&
line[wordlen] != '\t' && line[wordlen] != '\r' &&
line[wordlen] != '\n';)
wordlen++;
/* Does the server support the STARTTLS capability? */
if(len >= 8 && !memcmp(line, "STARTTLS", 8))
imapc->tls_supported = TRUE;
/* Has the server explicitly disabled clear text authentication? */
else if(wordlen == 13 && !memcmp(line, "LOGINDISABLED", 13))
imapc->login_disabled = TRUE;
/* Does the server support the SASL-IR capability? */
else if(wordlen == 7 && !memcmp(line, "SASL-IR", 7))
imapc->ir_supported = TRUE;
/* Do we have a SASL based authentication mechanism? */
else if(wordlen > 5 && !memcmp(line, "AUTH=", 5)) {
line += 5;
len -= 5;
wordlen -= 5;
/* Test the word for a matching authentication mechanism */
if(wordlen == 5 && !memcmp(line, "LOGIN", 5))
imapc->authmechs |= SASL_MECH_LOGIN;
if(wordlen == 5 && !memcmp(line, "PLAIN", 5))
imapc->authmechs |= SASL_MECH_PLAIN;
else if(wordlen == 8 && !memcmp(line, "CRAM-MD5", 8))
imapc->authmechs |= SASL_MECH_CRAM_MD5;
else if(wordlen == 10 && !memcmp(line, "DIGEST-MD5", 10))
imapc->authmechs |= SASL_MECH_DIGEST_MD5;
else if(wordlen == 6 && !memcmp(line, "GSSAPI", 6))
imapc->authmechs |= SASL_MECH_GSSAPI;
else if(wordlen == 8 && !memcmp(line, "EXTERNAL", 8))
imapc->authmechs |= SASL_MECH_EXTERNAL;
else if(wordlen == 4 && !memcmp(line, "NTLM", 4))
imapc->authmechs |= SASL_MECH_NTLM;
}
line += wordlen;
len -= wordlen;
}
}
}
/* Are we processing FETCH command responses? */
else if(imapc->state == IMAP_FETCH) {
/* Do we have a valid response? */
if(len >= 2 && !memcmp("* ", line, 2)) {
*resp = '*';
return TRUE;
}
}
return FALSE; /* Nothing for us */
}
/* This is the ONLY way to change IMAP state! */
static void state(struct connectdata *conn, imapstate newstate)
{
struct imap_conn *imapc = &conn->proto.imapc;
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
/* for debug purposes */
static const char * const names[]={
"STOP",
"SERVERGREET",
"CAPABILITY",
"STARTTLS",
"UPGRADETLS",
"AUTHENTICATE_PLAIN",
"AUTHENTICATE_LOGIN",
"AUTHENTICATE_LOGIN_PASSWD",
"AUTHENTICATE_CRAMMD5",
"AUTHENTICATE_DIGESTMD5",
"AUTHENTICATE_DIGESTMD5_RESP",
"AUTHENTICATE_NTLM",
"AUTHENTICATE_NTLM_TYPE2MSG",
"AUTHENTICATE",
"LOGIN",
"SELECT",
"FETCH",
"LOGOUT",
/* LAST */
};
if(imapc->state != newstate)
infof(conn->data, "IMAP %p state change from %s to %s\n",
imapc, names[imapc->state], names[newstate]);
#endif
imapc->state = newstate;
}
static CURLcode imap_state_capability(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct imap_conn *imapc = &conn->proto.imapc;
imapc->authmechs = 0; /* No known authentication mechanisms yet */
imapc->authused = 0; /* Clear the authentication mechanism used */
imapc->tls_supported = FALSE; /* Clear the TLS capability */
/* Send the CAPABILITY command */
result = imap_sendf(conn, "CAPABILITY");
if(result)
return result;
state(conn, IMAP_CAPABILITY);
return CURLE_OK;
}
static CURLcode imap_state_starttls(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
/* Send the STARTTLS command */
result = imap_sendf(conn, "STARTTLS");
if(!result)
state(conn, IMAP_STARTTLS);
return result;
}
static CURLcode imap_state_upgrade_tls(struct connectdata *conn)
{
struct imap_conn *imapc = &conn->proto.imapc;
CURLcode result;
/* Start the SSL connection */
result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &imapc->ssldone);
if(!result) {
if(imapc->state != IMAP_UPGRADETLS)
state(conn, IMAP_UPGRADETLS);
if(imapc->ssldone) {
imap_to_imaps(conn);
result = imap_state_capability(conn);
}
}
return result;
}
static CURLcode imap_state_login(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct FTP *imap = conn->data->state.proto.imap;
char *user;
char *passwd;
/* Check we have a username and password to authenticate with and end the
connect phase if we don't */
if(!conn->bits.user_passwd) {
state(conn, IMAP_STOP);
return result;
}
/* Make sure the username and password are in the correct atom format */
user = imap_atom(imap->user);
passwd = imap_atom(imap->passwd);
/* Send USER and password */
result = imap_sendf(conn, "LOGIN %s %s", user ? user : "",
passwd ? passwd : "");
Curl_safefree(user);
Curl_safefree(passwd);
if(result)
return result;
state(conn, IMAP_LOGIN);
return CURLE_OK;
}
static CURLcode imap_authenticate(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct imap_conn *imapc = &conn->proto.imapc;
const char *mech = NULL;
char *initresp = NULL;
size_t len = 0;
imapstate state1 = IMAP_STOP;
imapstate state2 = IMAP_STOP;
/* Check we have a username and password to authenticate with and end the
connect phase if we don't */
if(!conn->bits.user_passwd) {
state(conn, IMAP_STOP);
return result;
}
/* Calculate the supported authentication mechanism by decreasing order of
security */
#ifndef CURL_DISABLE_CRYPTO_AUTH
if(imapc->authmechs & SASL_MECH_DIGEST_MD5) {
mech = "DIGEST-MD5";
state1 = IMAP_AUTHENTICATE_DIGESTMD5;
imapc->authused = SASL_MECH_DIGEST_MD5;
}
else if(imapc->authmechs & SASL_MECH_CRAM_MD5) {
mech = "CRAM-MD5";
state1 = IMAP_AUTHENTICATE_CRAMMD5;
imapc->authused = SASL_MECH_CRAM_MD5;
}
else
#endif
#ifdef USE_NTLM
if(imapc->authmechs & SASL_MECH_NTLM) {
mech = "NTLM";
state1 = IMAP_AUTHENTICATE_NTLM;
state2 = IMAP_AUTHENTICATE_NTLM_TYPE2MSG;
imapc->authused = SASL_MECH_NTLM;
if(imapc->ir_supported)
result = Curl_sasl_create_login_message(conn->data, conn->user,
&initresp, &len);
}
else
#endif
if(imapc->authmechs & SASL_MECH_LOGIN) {
mech = "LOGIN";
state1 = IMAP_AUTHENTICATE_LOGIN;
state2 = IMAP_AUTHENTICATE_LOGIN_PASSWD;
imapc->authused = SASL_MECH_LOGIN;
if(imapc->ir_supported)
result = Curl_sasl_create_plain_message(conn->data, conn->user,
conn->passwd, &initresp, &len);
}
else if(imapc->authmechs & SASL_MECH_PLAIN) {
mech = "PLAIN";
state1 = IMAP_AUTHENTICATE_PLAIN;
state2 = IMAP_AUTHENTICATE;
imapc->authused = SASL_MECH_PLAIN;
if(imapc->ir_supported)
result = Curl_sasl_create_plain_message(conn->data, conn->user,
conn->passwd, &initresp, &len);
}
if(result)
return result;
if(mech) {
if(initresp) {
/* Perform SASL based authentication */
result = imap_sendf(conn, "AUTHENTICATE %s %s", mech, initresp);
if(!result)
state(conn, state2);
}
else {
result = imap_sendf(conn, "AUTHENTICATE %s", mech);
if(!result)
state(conn, state1);
}
Curl_safefree(initresp);
}
else if(!imapc->login_disabled)
/* Perform clear text authentication */
result = imap_state_login(conn);
else {
/* Other mechanisms not supported */
infof(conn->data, "No known authentication mechanisms supported!\n");
result = CURLE_LOGIN_DENIED;
}
return result;
}
/* For the initial server greeting */
static CURLcode imap_state_servergreet_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
(void)instate; /* no use for this yet */
if(imapcode != 'O') {
failf(data, "Got unexpected imap-server response");
return CURLE_FTP_WEIRD_SERVER_REPLY;
}
result = imap_state_capability(conn);
return result;
}
/* For CAPABILITY responses */
static CURLcode imap_state_capability_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
struct imap_conn *imapc = &conn->proto.imapc;
(void)instate; /* no use for this yet */
if(imapcode != 'O')
result = imap_state_login(conn);
else if(data->set.use_ssl && !conn->ssl[FIRSTSOCKET].use) {
/* We don't have a SSL/TLS connection yet, but SSL is requested */
if(imapc->tls_supported)
/* Switch to TLS connection now */
result = imap_state_starttls(conn);
else if(data->set.use_ssl == CURLUSESSL_TRY)
/* Fallback and carry on with authentication */
result = imap_authenticate(conn);
else {
failf(data, "STARTTLS not supported.");
result = CURLE_USE_SSL_FAILED;
}
}
else
result = imap_authenticate(conn);
return result;
}
/* For STARTTLS responses */
static CURLcode imap_state_starttls_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
(void)instate; /* no use for this yet */
if(imapcode != 'O') {
if(data->set.use_ssl != CURLUSESSL_TRY) {
failf(data, "STARTTLS denied. %c", imapcode);
result = CURLE_USE_SSL_FAILED;
}
else
result = imap_authenticate(conn);
}
else
result = imap_state_upgrade_tls(conn);
return result;
}
/* For AUTHENTICATE PLAIN (without initial response) responses */
static CURLcode imap_state_auth_plain_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
size_t len = 0;
char *plainauth = NULL;
(void)instate; /* no use for this yet */
if(imapcode != '+') {
failf(data, "Access denied. %c", imapcode);
result = CURLE_LOGIN_DENIED;
}
else {
/* Create the authorisation message */
result = Curl_sasl_create_plain_message(data, conn->user, conn->passwd,
&plainauth, &len);
/* Send the message */
if(!result) {
if(plainauth) {
result = Curl_pp_sendf(&conn->proto.imapc.pp, "%s", plainauth);
if(!result)
state(conn, IMAP_AUTHENTICATE);
}
Curl_safefree(plainauth);
}
}
return result;
}
/* For AUTHENTICATE LOGIN (without initial response) responses */
static CURLcode imap_state_auth_login_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
size_t len = 0;
char *authuser = NULL;
(void)instate; /* no use for this yet */
if(imapcode != '+') {
failf(data, "Access denied: %d", imapcode);
result = CURLE_LOGIN_DENIED;
}
else {
/* Create the user message */
result = Curl_sasl_create_login_message(data, conn->user,
&authuser, &len);
/* Send the user */
if(!result) {
if(authuser) {
result = Curl_pp_sendf(&conn->proto.imapc.pp, "%s", authuser);
if(!result)
state(conn, IMAP_AUTHENTICATE_LOGIN_PASSWD);
}
Curl_safefree(authuser);
}
}
return result;
}
/* For AUTHENTICATE LOGIN user entry responses */
static CURLcode imap_state_auth_login_password_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
size_t len = 0;
char *authpasswd = NULL;
(void)instate; /* no use for this yet */
if(imapcode != '+') {
failf(data, "Access denied: %d", imapcode);
result = CURLE_LOGIN_DENIED;
}
else {
/* Create the password message */
result = Curl_sasl_create_login_message(data, conn->passwd,
&authpasswd, &len);
/* Send the password */
if(!result) {
if(authpasswd) {
result = Curl_pp_sendf(&conn->proto.imapc.pp, "%s", authpasswd);
if(!result)
state(conn, IMAP_AUTHENTICATE);
}
Curl_safefree(authpasswd);
}
}
return result;
}
#ifndef CURL_DISABLE_CRYPTO_AUTH
/* For AUTHENTICATE CRAM-MD5 responses */
static CURLcode imap_state_auth_cram_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
char *chlg64 = data->state.buffer;
size_t len = 0;
char *rplyb64 = NULL;
(void)instate; /* no use for this yet */
if(imapcode != '+') {
failf(data, "Access denied: %d", imapcode);
return CURLE_LOGIN_DENIED;
}
/* Get the challenge */
for(chlg64 += 2; *chlg64 == ' ' || *chlg64 == '\t'; chlg64++)
;
/* Terminate the challenge */
if(*chlg64 != '=') {
for(len = strlen(chlg64); len--;)
if(chlg64[len] != '\r' && chlg64[len] != '\n' && chlg64[len] != ' ' &&
chlg64[len] != '\t')
break;
if(++len) {
chlg64[len] = '\0';
}
}
/* Create the response message */
result = Curl_sasl_create_cram_md5_message(data, chlg64, conn->user,
conn->passwd, &rplyb64, &len);
/* Send the response */
if(!result) {
if(rplyb64) {
result = Curl_pp_sendf(&conn->proto.imapc.pp, "%s", rplyb64);
if(!result)
state(conn, IMAP_AUTHENTICATE);
}
Curl_safefree(rplyb64);
}
return result;
}
/* For AUTHENTICATE DIGEST-MD5 challenge responses */
static CURLcode imap_state_auth_digest_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
char *chlg64 = data->state.buffer;
size_t len = 0;
char *rplyb64 = NULL;
(void)instate; /* no use for this yet */
if(imapcode != '+') {
failf(data, "Access denied: %d", imapcode);
return CURLE_LOGIN_DENIED;
}
/* Get the challenge */
for(chlg64 += 2; *chlg64 == ' ' || *chlg64 == '\t'; chlg64++)
;
/* Create the response message */
result = Curl_sasl_create_digest_md5_message(data, chlg64, conn->user,
conn->passwd, "imap",
&rplyb64, &len);
/* Send the response */
if(!result) {
if(rplyb64) {
result = Curl_pp_sendf(&conn->proto.imapc.pp, "%s", rplyb64);
if(!result)
state(conn, IMAP_AUTHENTICATE_DIGESTMD5_RESP);
}
Curl_safefree(rplyb64);
}
return result;
}
/* For AUTHENTICATE DIGEST-MD5 challenge-response responses */
static CURLcode imap_state_auth_digest_resp_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
(void)instate; /* no use for this yet */
if(imapcode != '+') {
failf(data, "Authentication failed: %d", imapcode);
result = CURLE_LOGIN_DENIED;
}
else {
/* Send an empty response */
result = Curl_pp_sendf(&conn->proto.imapc.pp, "");
if(!result)
state(conn, IMAP_AUTHENTICATE);
}
return result;
}
#endif
#ifdef USE_NTLM
/* For AUTHENTICATE NTLM (without initial response) responses */
static CURLcode imap_state_auth_ntlm_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
size_t len = 0;
char *type1msg = NULL;
(void)instate; /* no use for this yet */
if(imapcode != '+') {
failf(data, "Access denied: %d", imapcode);
result = CURLE_LOGIN_DENIED;
}
else {
/* Create the type-1 message */
result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd,
&conn->ntlm,
&type1msg, &len);
/* Send the message */
if(!result) {
if(type1msg) {
result = Curl_pp_sendf(&conn->proto.imapc.pp, "%s", type1msg);
if(!result)
state(conn, IMAP_AUTHENTICATE_NTLM_TYPE2MSG);
}
Curl_safefree(type1msg);
}
}