mirror of
https://github.com/nginx/nginx.git
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773 lines
17 KiB
C
773 lines
17 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_event.h>
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#include <ngx_mail.h>
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static void ngx_mail_init_session(ngx_connection_t *c);
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#if (NGX_MAIL_SSL)
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static void ngx_mail_ssl_init_connection(ngx_ssl_t *ssl, ngx_connection_t *c);
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static void ngx_mail_ssl_handshake_handler(ngx_connection_t *c);
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#endif
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void
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ngx_mail_init_connection(ngx_connection_t *c)
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{
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ngx_uint_t i;
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ngx_mail_port_t *port;
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struct sockaddr *sa;
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struct sockaddr_in *sin;
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ngx_mail_log_ctx_t *ctx;
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ngx_mail_in_addr_t *addr;
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ngx_mail_session_t *s;
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ngx_mail_addr_conf_t *addr_conf;
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#if (NGX_HAVE_INET6)
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struct sockaddr_in6 *sin6;
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ngx_mail_in6_addr_t *addr6;
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#endif
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/* find the server configuration for the address:port */
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/* AF_INET only */
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port = c->listening->servers;
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if (port->naddrs > 1) {
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/*
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* There are several addresses on this port and one of them
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* is the "*:port" wildcard so getsockname() is needed to determine
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* the server address.
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*
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* AcceptEx() already gave this address.
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*/
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if (ngx_connection_local_sockaddr(c, NULL, 0) != NGX_OK) {
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ngx_mail_close_connection(c);
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return;
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}
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sa = c->local_sockaddr;
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switch (sa->sa_family) {
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#if (NGX_HAVE_INET6)
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *) sa;
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addr6 = port->addrs;
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/* the last address is "*" */
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for (i = 0; i < port->naddrs - 1; i++) {
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if (ngx_memcmp(&addr6[i].addr6, &sin6->sin6_addr, 16) == 0) {
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break;
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}
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}
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addr_conf = &addr6[i].conf;
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break;
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#endif
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default: /* AF_INET */
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sin = (struct sockaddr_in *) sa;
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addr = port->addrs;
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/* the last address is "*" */
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for (i = 0; i < port->naddrs - 1; i++) {
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if (addr[i].addr == sin->sin_addr.s_addr) {
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break;
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}
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}
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addr_conf = &addr[i].conf;
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break;
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}
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} else {
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switch (c->local_sockaddr->sa_family) {
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#if (NGX_HAVE_INET6)
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case AF_INET6:
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addr6 = port->addrs;
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addr_conf = &addr6[0].conf;
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break;
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#endif
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default: /* AF_INET */
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addr = port->addrs;
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addr_conf = &addr[0].conf;
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break;
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}
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}
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s = ngx_pcalloc(c->pool, sizeof(ngx_mail_session_t));
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if (s == NULL) {
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ngx_mail_close_connection(c);
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return;
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}
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s->main_conf = addr_conf->ctx->main_conf;
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s->srv_conf = addr_conf->ctx->srv_conf;
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s->addr_text = &addr_conf->addr_text;
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c->data = s;
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s->connection = c;
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ngx_log_error(NGX_LOG_INFO, c->log, 0, "*%ui client %V connected to %V",
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c->number, &c->addr_text, s->addr_text);
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ctx = ngx_palloc(c->pool, sizeof(ngx_mail_log_ctx_t));
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if (ctx == NULL) {
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ngx_mail_close_connection(c);
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return;
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}
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ctx->client = &c->addr_text;
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ctx->session = s;
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c->log->connection = c->number;
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c->log->handler = ngx_mail_log_error;
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c->log->data = ctx;
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c->log->action = "sending client greeting line";
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c->log_error = NGX_ERROR_INFO;
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#if (NGX_MAIL_SSL)
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{
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ngx_mail_ssl_conf_t *sslcf;
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sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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if (sslcf->enable) {
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c->log->action = "SSL handshaking";
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ngx_mail_ssl_init_connection(&sslcf->ssl, c);
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return;
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}
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if (addr_conf->ssl) {
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c->log->action = "SSL handshaking";
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if (sslcf->ssl.ctx == NULL) {
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ngx_log_error(NGX_LOG_ERR, c->log, 0,
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"no \"ssl_certificate\" is defined "
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"in server listening on SSL port");
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ngx_mail_close_connection(c);
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return;
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}
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ngx_mail_ssl_init_connection(&sslcf->ssl, c);
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return;
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}
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}
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#endif
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ngx_mail_init_session(c);
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}
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#if (NGX_MAIL_SSL)
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void
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ngx_mail_starttls_handler(ngx_event_t *rev)
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{
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ngx_connection_t *c;
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ngx_mail_session_t *s;
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ngx_mail_ssl_conf_t *sslcf;
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c = rev->data;
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s = c->data;
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s->starttls = 1;
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c->log->action = "in starttls state";
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sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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ngx_mail_ssl_init_connection(&sslcf->ssl, c);
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}
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static void
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ngx_mail_ssl_init_connection(ngx_ssl_t *ssl, ngx_connection_t *c)
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{
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ngx_mail_session_t *s;
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ngx_mail_core_srv_conf_t *cscf;
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if (ngx_ssl_create_connection(ssl, c, 0) == NGX_ERROR) {
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ngx_mail_close_connection(c);
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return;
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}
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if (ngx_ssl_handshake(c) == NGX_AGAIN) {
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s = c->data;
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cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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ngx_add_timer(c->read, cscf->timeout);
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c->ssl->handler = ngx_mail_ssl_handshake_handler;
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return;
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}
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ngx_mail_ssl_handshake_handler(c);
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}
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static void
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ngx_mail_ssl_handshake_handler(ngx_connection_t *c)
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{
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ngx_mail_session_t *s;
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ngx_mail_core_srv_conf_t *cscf;
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if (c->ssl->handshaked) {
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s = c->data;
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if (s->starttls) {
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cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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c->read->handler = cscf->protocol->init_protocol;
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c->write->handler = ngx_mail_send;
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cscf->protocol->init_protocol(c->read);
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return;
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}
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c->read->ready = 0;
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ngx_mail_init_session(c);
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return;
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}
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ngx_mail_close_connection(c);
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}
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#endif
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static void
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ngx_mail_init_session(ngx_connection_t *c)
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{
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ngx_mail_session_t *s;
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ngx_mail_core_srv_conf_t *cscf;
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s = c->data;
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cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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s->protocol = cscf->protocol->type;
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s->ctx = ngx_pcalloc(c->pool, sizeof(void *) * ngx_mail_max_module);
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if (s->ctx == NULL) {
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ngx_mail_session_internal_server_error(s);
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return;
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}
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c->write->handler = ngx_mail_send;
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cscf->protocol->init_session(s, c);
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}
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ngx_int_t
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ngx_mail_salt(ngx_mail_session_t *s, ngx_connection_t *c,
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ngx_mail_core_srv_conf_t *cscf)
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{
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s->salt.data = ngx_pnalloc(c->pool,
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sizeof(" <18446744073709551616.@>" CRLF) - 1
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+ NGX_TIME_T_LEN
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+ cscf->server_name.len);
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if (s->salt.data == NULL) {
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return NGX_ERROR;
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}
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s->salt.len = ngx_sprintf(s->salt.data, "<%ul.%T@%V>" CRLF,
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ngx_random(), ngx_time(), &cscf->server_name)
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- s->salt.data;
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return NGX_OK;
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}
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#if (NGX_MAIL_SSL)
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ngx_int_t
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ngx_mail_starttls_only(ngx_mail_session_t *s, ngx_connection_t *c)
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{
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ngx_mail_ssl_conf_t *sslcf;
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if (c->ssl) {
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return 0;
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}
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sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
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return 1;
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}
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return 0;
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}
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#endif
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ngx_int_t
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ngx_mail_auth_plain(ngx_mail_session_t *s, ngx_connection_t *c, ngx_uint_t n)
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{
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u_char *p, *last;
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ngx_str_t *arg, plain;
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arg = s->args.elts;
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#if (NGX_DEBUG_MAIL_PASSWD)
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ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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"mail auth plain: \"%V\"", &arg[n]);
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#endif
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plain.data = ngx_pnalloc(c->pool, ngx_base64_decoded_length(arg[n].len));
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if (plain.data == NULL){
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return NGX_ERROR;
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}
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if (ngx_decode_base64(&plain, &arg[n]) != NGX_OK) {
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ngx_log_error(NGX_LOG_INFO, c->log, 0,
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"client sent invalid base64 encoding in AUTH PLAIN command");
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return NGX_MAIL_PARSE_INVALID_COMMAND;
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}
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p = plain.data;
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last = p + plain.len;
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while (p < last && *p++) { /* void */ }
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if (p == last) {
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ngx_log_error(NGX_LOG_INFO, c->log, 0,
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"client sent invalid login in AUTH PLAIN command");
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return NGX_MAIL_PARSE_INVALID_COMMAND;
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}
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s->login.data = p;
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while (p < last && *p) { p++; }
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if (p == last) {
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ngx_log_error(NGX_LOG_INFO, c->log, 0,
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"client sent invalid password in AUTH PLAIN command");
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return NGX_MAIL_PARSE_INVALID_COMMAND;
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}
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s->login.len = p++ - s->login.data;
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s->passwd.len = last - p;
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s->passwd.data = p;
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#if (NGX_DEBUG_MAIL_PASSWD)
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ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
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"mail auth plain: \"%V\" \"%V\"", &s->login, &s->passwd);
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#endif
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return NGX_DONE;
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}
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ngx_int_t
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ngx_mail_auth_login_username(ngx_mail_session_t *s, ngx_connection_t *c,
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ngx_uint_t n)
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{
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ngx_str_t *arg;
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arg = s->args.elts;
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ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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"mail auth login username: \"%V\"", &arg[n]);
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s->login.data = ngx_pnalloc(c->pool, ngx_base64_decoded_length(arg[n].len));
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if (s->login.data == NULL){
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return NGX_ERROR;
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}
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if (ngx_decode_base64(&s->login, &arg[n]) != NGX_OK) {
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ngx_log_error(NGX_LOG_INFO, c->log, 0,
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"client sent invalid base64 encoding in AUTH LOGIN command");
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return NGX_MAIL_PARSE_INVALID_COMMAND;
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}
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ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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"mail auth login username: \"%V\"", &s->login);
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return NGX_OK;
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}
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ngx_int_t
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ngx_mail_auth_login_password(ngx_mail_session_t *s, ngx_connection_t *c)
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{
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ngx_str_t *arg;
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arg = s->args.elts;
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#if (NGX_DEBUG_MAIL_PASSWD)
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ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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"mail auth login password: \"%V\"", &arg[0]);
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#endif
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s->passwd.data = ngx_pnalloc(c->pool,
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ngx_base64_decoded_length(arg[0].len));
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if (s->passwd.data == NULL){
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return NGX_ERROR;
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}
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if (ngx_decode_base64(&s->passwd, &arg[0]) != NGX_OK) {
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ngx_log_error(NGX_LOG_INFO, c->log, 0,
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"client sent invalid base64 encoding in AUTH LOGIN command");
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return NGX_MAIL_PARSE_INVALID_COMMAND;
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}
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#if (NGX_DEBUG_MAIL_PASSWD)
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ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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"mail auth login password: \"%V\"", &s->passwd);
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#endif
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return NGX_DONE;
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}
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ngx_int_t
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ngx_mail_auth_cram_md5_salt(ngx_mail_session_t *s, ngx_connection_t *c,
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char *prefix, size_t len)
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{
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u_char *p;
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ngx_str_t salt;
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ngx_uint_t n;
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p = ngx_pnalloc(c->pool, len + ngx_base64_encoded_length(s->salt.len) + 2);
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if (p == NULL) {
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return NGX_ERROR;
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}
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salt.data = ngx_cpymem(p, prefix, len);
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s->salt.len -= 2;
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ngx_encode_base64(&salt, &s->salt);
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s->salt.len += 2;
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n = len + salt.len;
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p[n++] = CR; p[n++] = LF;
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s->out.len = n;
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s->out.data = p;
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return NGX_OK;
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}
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ngx_int_t
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ngx_mail_auth_cram_md5(ngx_mail_session_t *s, ngx_connection_t *c)
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{
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u_char *p, *last;
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ngx_str_t *arg;
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arg = s->args.elts;
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ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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"mail auth cram-md5: \"%V\"", &arg[0]);
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s->login.data = ngx_pnalloc(c->pool, ngx_base64_decoded_length(arg[0].len));
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if (s->login.data == NULL){
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return NGX_ERROR;
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}
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if (ngx_decode_base64(&s->login, &arg[0]) != NGX_OK) {
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ngx_log_error(NGX_LOG_INFO, c->log, 0,
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"client sent invalid base64 encoding in AUTH CRAM-MD5 command");
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return NGX_MAIL_PARSE_INVALID_COMMAND;
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}
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p = s->login.data;
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last = p + s->login.len;
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while (p < last) {
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if (*p++ == ' ') {
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s->login.len = p - s->login.data - 1;
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s->passwd.len = last - p;
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s->passwd.data = p;
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break;
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}
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}
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if (s->passwd.len != 32) {
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ngx_log_error(NGX_LOG_INFO, c->log, 0,
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"client sent invalid CRAM-MD5 hash in AUTH CRAM-MD5 command");
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return NGX_MAIL_PARSE_INVALID_COMMAND;
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}
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ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
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"mail auth cram-md5: \"%V\" \"%V\"", &s->login, &s->passwd);
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s->auth_method = NGX_MAIL_AUTH_CRAM_MD5;
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return NGX_DONE;
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}
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void
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ngx_mail_send(ngx_event_t *wev)
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{
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ngx_int_t n;
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ngx_connection_t *c;
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ngx_mail_session_t *s;
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ngx_mail_core_srv_conf_t *cscf;
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c = wev->data;
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s = c->data;
|
|
|
|
if (wev->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 == 0) {
|
|
if (ngx_handle_write_event(c->write, 0) != NGX_OK) {
|
|
ngx_mail_close_connection(c);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
n = c->send(c, s->out.data, s->out.len);
|
|
|
|
if (n > 0) {
|
|
s->out.len -= n;
|
|
|
|
if (wev->timer_set) {
|
|
ngx_del_timer(wev);
|
|
}
|
|
|
|
if (s->quit) {
|
|
ngx_mail_close_connection(c);
|
|
return;
|
|
}
|
|
|
|
if (s->blocked) {
|
|
c->read->handler(c->read);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if (n == NGX_ERROR) {
|
|
ngx_mail_close_connection(c);
|
|
return;
|
|
}
|
|
|
|
/* n == NGX_AGAIN */
|
|
|
|
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
|
ngx_add_timer(c->write, cscf->timeout);
|
|
|
|
if (ngx_handle_write_event(c->write, 0) != NGX_OK) {
|
|
ngx_mail_close_connection(c);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
ngx_int_t
|
|
ngx_mail_read_command(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
{
|
|
ssize_t n;
|
|
ngx_int_t rc;
|
|
ngx_str_t l;
|
|
ngx_mail_core_srv_conf_t *cscf;
|
|
|
|
n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last);
|
|
|
|
if (n == NGX_ERROR || n == 0) {
|
|
ngx_mail_close_connection(c);
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
if (n > 0) {
|
|
s->buffer->last += n;
|
|
}
|
|
|
|
if (n == NGX_AGAIN) {
|
|
if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
|
|
ngx_mail_session_internal_server_error(s);
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
return NGX_AGAIN;
|
|
}
|
|
|
|
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
|
rc = cscf->protocol->parse_command(s);
|
|
|
|
if (rc == NGX_AGAIN) {
|
|
|
|
if (s->buffer->last < s->buffer->end) {
|
|
return rc;
|
|
}
|
|
|
|
l.len = s->buffer->last - s->buffer->start;
|
|
l.data = s->buffer->start;
|
|
|
|
ngx_log_error(NGX_LOG_INFO, c->log, 0,
|
|
"client sent too long command \"%V\"", &l);
|
|
|
|
s->quit = 1;
|
|
|
|
return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
}
|
|
|
|
if (rc == NGX_IMAP_NEXT || rc == NGX_MAIL_PARSE_INVALID_COMMAND) {
|
|
return rc;
|
|
}
|
|
|
|
if (rc == NGX_ERROR) {
|
|
ngx_mail_close_connection(c);
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
return NGX_OK;
|
|
}
|
|
|
|
|
|
void
|
|
ngx_mail_auth(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
{
|
|
s->args.nelts = 0;
|
|
s->buffer->pos = s->buffer->start;
|
|
s->buffer->last = s->buffer->start;
|
|
s->state = 0;
|
|
|
|
if (c->read->timer_set) {
|
|
ngx_del_timer(c->read);
|
|
}
|
|
|
|
s->login_attempt++;
|
|
|
|
ngx_mail_auth_http_init(s);
|
|
}
|
|
|
|
|
|
void
|
|
ngx_mail_session_internal_server_error(ngx_mail_session_t *s)
|
|
{
|
|
ngx_mail_core_srv_conf_t *cscf;
|
|
|
|
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
|
s->out = cscf->protocol->internal_server_error;
|
|
s->quit = 1;
|
|
|
|
ngx_mail_send(s->connection->write);
|
|
}
|
|
|
|
|
|
void
|
|
ngx_mail_close_connection(ngx_connection_t *c)
|
|
{
|
|
ngx_pool_t *pool;
|
|
|
|
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
"close mail connection: %d", c->fd);
|
|
|
|
#if (NGX_MAIL_SSL)
|
|
|
|
if (c->ssl) {
|
|
if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
|
|
c->ssl->handler = ngx_mail_close_connection;
|
|
return;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
#if (NGX_STAT_STUB)
|
|
(void) ngx_atomic_fetch_add(ngx_stat_active, -1);
|
|
#endif
|
|
|
|
c->destroyed = 1;
|
|
|
|
pool = c->pool;
|
|
|
|
ngx_close_connection(c);
|
|
|
|
ngx_destroy_pool(pool);
|
|
}
|
|
|
|
|
|
u_char *
|
|
ngx_mail_log_error(ngx_log_t *log, u_char *buf, size_t len)
|
|
{
|
|
u_char *p;
|
|
ngx_mail_session_t *s;
|
|
ngx_mail_log_ctx_t *ctx;
|
|
|
|
if (log->action) {
|
|
p = ngx_snprintf(buf, len, " while %s", log->action);
|
|
len -= p - buf;
|
|
buf = p;
|
|
}
|
|
|
|
ctx = log->data;
|
|
|
|
p = ngx_snprintf(buf, len, ", client: %V", ctx->client);
|
|
len -= p - buf;
|
|
buf = p;
|
|
|
|
s = ctx->session;
|
|
|
|
if (s == NULL) {
|
|
return p;
|
|
}
|
|
|
|
p = ngx_snprintf(buf, len, "%s, server: %V",
|
|
s->starttls ? " using starttls" : "",
|
|
s->addr_text);
|
|
len -= p - buf;
|
|
buf = p;
|
|
|
|
if (s->login.len == 0) {
|
|
return p;
|
|
}
|
|
|
|
p = ngx_snprintf(buf, len, ", login: \"%V\"", &s->login);
|
|
len -= p - buf;
|
|
buf = p;
|
|
|
|
if (s->proxy == NULL) {
|
|
return p;
|
|
}
|
|
|
|
p = ngx_snprintf(buf, len, ", upstream: %V", s->proxy->upstream.name);
|
|
|
|
return p;
|
|
}
|