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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_mail.h>
#include <ngx_mail_imap_module.h>
static ngx_int_t ngx_mail_imap_login(ngx_mail_session_t *s,
ngx_connection_t *c);
static ngx_int_t ngx_mail_imap_authenticate(ngx_mail_session_t *s,
ngx_connection_t *c);
static ngx_int_t ngx_mail_imap_capability(ngx_mail_session_t *s,
ngx_connection_t *c);
static ngx_int_t ngx_mail_imap_starttls(ngx_mail_session_t *s,
ngx_connection_t *c);
static u_char imap_greeting[] = "* OK IMAP4 ready" CRLF;
static u_char imap_star[] = "* ";
static u_char imap_ok[] = "OK completed" CRLF;
static u_char imap_next[] = "+ OK" CRLF;
static u_char imap_plain_next[] = "+ " CRLF;
static u_char imap_username[] = "+ VXNlcm5hbWU6" CRLF;
static u_char imap_password[] = "+ UGFzc3dvcmQ6" CRLF;
static u_char imap_bye[] = "* BYE" CRLF;
static u_char imap_invalid_command[] = "BAD invalid command" CRLF;
void
ngx_mail_imap_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
{
ngx_mail_core_srv_conf_t *cscf;
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
ngx_str_set(&s->out, imap_greeting);
c->read->handler = ngx_mail_imap_init_protocol;
ngx_add_timer(c->read, cscf->timeout);
if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
ngx_mail_close_connection(c);
}
ngx_mail_send(c->write);
}
void
ngx_mail_imap_init_protocol(ngx_event_t *rev)
{
ngx_connection_t *c;
ngx_mail_session_t *s;
ngx_mail_imap_srv_conf_t *iscf;
c = rev->data;
c->log->action = "in auth state";
if (rev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
c->timedout = 1;
ngx_mail_close_connection(c);
return;
}
s = c->data;
if (s->buffer == NULL) {
if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t))
== NGX_ERROR)
{
ngx_mail_session_internal_server_error(s);
return;
}
iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
s->buffer = ngx_create_temp_buf(c->pool, iscf->client_buffer_size);
if (s->buffer == NULL) {
ngx_mail_session_internal_server_error(s);
return;
}
}
s->mail_state = ngx_imap_start;
c->read->handler = ngx_mail_imap_auth_state;
ngx_mail_imap_auth_state(rev);
}
void
ngx_mail_imap_auth_state(ngx_event_t *rev)
{
u_char *p, *dst, *src, *end;
ngx_str_t *arg;
ngx_int_t rc;
ngx_uint_t tag, i;
ngx_connection_t *c;
ngx_mail_session_t *s;
c = rev->data;
s = c->data;
ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth state");
if (rev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
c->timedout = 1;
ngx_mail_close_connection(c);
return;
}
if (s->out.len) {
ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap send handler busy");
s->blocked = 1;
return;
}
s->blocked = 0;
rc = ngx_mail_read_command(s, c);
if (rc == NGX_AGAIN || rc == NGX_ERROR) {
return;
}
tag = 1;
s->text.len = 0;
ngx_str_set(&s->out, imap_ok);
if (rc == NGX_OK) {
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth command: %i",
s->command);
if (s->backslash) {
arg = s->args.elts;
for (i = 0; i < s->args.nelts; i++) {
dst = arg[i].data;
end = dst + arg[i].len;
for (src = dst; src < end; dst++) {
*dst = *src;
if (*src++ == '\\') {
*dst = *src++;
}
}
arg[i].len = dst - arg[i].data;
}
s->backslash = 0;
}
switch (s->mail_state) {
case ngx_imap_start:
switch (s->command) {
case NGX_IMAP_LOGIN:
rc = ngx_mail_imap_login(s, c);
break;
case NGX_IMAP_AUTHENTICATE:
rc = ngx_mail_imap_authenticate(s, c);
tag = (rc != NGX_OK);
break;
case NGX_IMAP_CAPABILITY:
rc = ngx_mail_imap_capability(s, c);
break;
case NGX_IMAP_LOGOUT:
s->quit = 1;
ngx_str_set(&s->text, imap_bye);
break;
case NGX_IMAP_NOOP:
break;
case NGX_IMAP_STARTTLS:
rc = ngx_mail_imap_starttls(s, c);
break;
default:
rc = NGX_MAIL_PARSE_INVALID_COMMAND;
break;
}
break;
case ngx_imap_auth_login_username:
rc = ngx_mail_auth_login_username(s, c, 0);
tag = 0;
ngx_str_set(&s->out, imap_password);
s->mail_state = ngx_imap_auth_login_password;
break;
case ngx_imap_auth_login_password:
rc = ngx_mail_auth_login_password(s, c);
break;
case ngx_imap_auth_plain:
rc = ngx_mail_auth_plain(s, c, 0);
break;
case ngx_imap_auth_cram_md5:
rc = ngx_mail_auth_cram_md5(s, c);
break;
}
} else if (rc == NGX_IMAP_NEXT) {
tag = 0;
ngx_str_set(&s->out, imap_next);
}
switch (rc) {
case NGX_DONE:
ngx_mail_auth(s, c);
return;
case NGX_ERROR:
ngx_mail_session_internal_server_error(s);
return;
case NGX_MAIL_PARSE_INVALID_COMMAND:
s->state = 0;
ngx_str_set(&s->out, imap_invalid_command);
s->mail_state = ngx_imap_start;
break;
}
if (tag) {
if (s->tag.len == 0) {
ngx_str_set(&s->tag, imap_star);
}
if (s->tagged_line.len < s->tag.len + s->text.len + s->out.len) {
s->tagged_line.len = s->tag.len + s->text.len + s->out.len;
s->tagged_line.data = ngx_pnalloc(c->pool, s->tagged_line.len);
if (s->tagged_line.data == NULL) {
ngx_mail_close_connection(c);
return;
}
}
p = s->tagged_line.data;
if (s->text.len) {
p = ngx_cpymem(p, s->text.data, s->text.len);
}
p = ngx_cpymem(p, s->tag.data, s->tag.len);
ngx_memcpy(p, s->out.data, s->out.len);
s->out.len = s->text.len + s->tag.len + s->out.len;
s->out.data = s->tagged_line.data;
}
if (rc != NGX_IMAP_NEXT) {
s->args.nelts = 0;
if (s->state) {
/* preserve tag */
s->arg_start = s->buffer->start + s->tag.len;
s->buffer->pos = s->arg_start;
s->buffer->last = s->arg_start;
} else {
s->buffer->pos = s->buffer->start;
s->buffer->last = s->buffer->start;
s->tag.len = 0;
}
}
ngx_mail_send(c->write);
}
static ngx_int_t
ngx_mail_imap_login(ngx_mail_session_t *s, ngx_connection_t *c)
{
ngx_str_t *arg;
#if (NGX_MAIL_SSL)
if (ngx_mail_starttls_only(s, c)) {
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
#endif
arg = s->args.elts;
if (s->args.nelts != 2 || arg[0].len == 0) {
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
s->login.len = arg[0].len;
s->login.data = ngx_pnalloc(c->pool, s->login.len);
if (s->login.data == NULL) {
return NGX_ERROR;
}
ngx_memcpy(s->login.data, arg[0].data, s->login.len);
s->passwd.len = arg[1].len;
s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len);
if (s->passwd.data == NULL) {
return NGX_ERROR;
}
ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len);
#if (NGX_DEBUG_MAIL_PASSWD)
ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
"imap login:\"%V\" passwd:\"%V\"",
&s->login, &s->passwd);
#else
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
"imap login:\"%V\"", &s->login);
#endif
return NGX_DONE;
}
static ngx_int_t
ngx_mail_imap_authenticate(ngx_mail_session_t *s, ngx_connection_t *c)
{
ngx_int_t rc;
ngx_mail_core_srv_conf_t *cscf;
ngx_mail_imap_srv_conf_t *iscf;
#if (NGX_MAIL_SSL)
if (ngx_mail_starttls_only(s, c)) {
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
#endif
rc = ngx_mail_auth_parse(s, c);
switch (rc) {
case NGX_MAIL_AUTH_LOGIN:
ngx_str_set(&s->out, imap_username);
s->mail_state = ngx_imap_auth_login_username;
return NGX_OK;
case NGX_MAIL_AUTH_LOGIN_USERNAME:
ngx_str_set(&s->out, imap_password);
s->mail_state = ngx_imap_auth_login_password;
return ngx_mail_auth_login_username(s, c, 1);
case NGX_MAIL_AUTH_PLAIN:
ngx_str_set(&s->out, imap_plain_next);
s->mail_state = ngx_imap_auth_plain;
return NGX_OK;
case NGX_MAIL_AUTH_CRAM_MD5:
iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
if (!(iscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
if (s->salt.data == NULL) {
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
return NGX_ERROR;
}
}
if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) {
s->mail_state = ngx_imap_auth_cram_md5;
return NGX_OK;
}
return NGX_ERROR;
}
return rc;
}
static ngx_int_t
ngx_mail_imap_capability(ngx_mail_session_t *s, ngx_connection_t *c)
{
ngx_mail_imap_srv_conf_t *iscf;
iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
#if (NGX_MAIL_SSL)
if (c->ssl == NULL) {
ngx_mail_ssl_conf_t *sslcf;
sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
s->text = iscf->starttls_capability;
return NGX_OK;
}
if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
s->text = iscf->starttls_only_capability;
return NGX_OK;
}
}
#endif
s->text = iscf->capability;
return NGX_OK;
}
static ngx_int_t
ngx_mail_imap_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
{
#if (NGX_MAIL_SSL)
ngx_mail_ssl_conf_t *sslcf;
if (c->ssl == NULL) {
sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
if (sslcf->starttls) {
c->read->handler = ngx_mail_starttls_handler;
return NGX_OK;
}
}
#endif
return NGX_MAIL_PARSE_INVALID_COMMAND;
}
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