| |
| /* |
| * 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_pop3_module.h> |
| |
| |
| static ngx_int_t ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c); |
| static ngx_int_t ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c); |
| static ngx_int_t ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, |
| ngx_int_t stls); |
| static ngx_int_t ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c); |
| static ngx_int_t ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c); |
| static ngx_int_t ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c); |
| |
| |
| static u_char pop3_greeting[] = "+OK POP3 ready" CRLF; |
| static u_char pop3_ok[] = "+OK" CRLF; |
| static u_char pop3_next[] = "+ " CRLF; |
| static u_char pop3_username[] = "+ VXNlcm5hbWU6" CRLF; |
| static u_char pop3_password[] = "+ UGFzc3dvcmQ6" CRLF; |
| static u_char pop3_invalid_command[] = "-ERR invalid command" CRLF; |
| |
| |
| void |
| ngx_mail_pop3_init_session(ngx_mail_session_t *s, ngx_connection_t *c) |
| { |
| u_char *p; |
| ngx_mail_core_srv_conf_t *cscf; |
| ngx_mail_pop3_srv_conf_t *pscf; |
| |
| pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
| cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
| |
| if (pscf->auth_methods |
| & (NGX_MAIL_AUTH_APOP_ENABLED|NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) |
| { |
| if (ngx_mail_salt(s, c, cscf) != NGX_OK) { |
| ngx_mail_session_internal_server_error(s); |
| return; |
| } |
| |
| s->out.data = ngx_pnalloc(c->pool, sizeof(pop3_greeting) + s->salt.len); |
| if (s->out.data == NULL) { |
| ngx_mail_session_internal_server_error(s); |
| return; |
| } |
| |
| p = ngx_cpymem(s->out.data, pop3_greeting, sizeof(pop3_greeting) - 3); |
| *p++ = ' '; |
| p = ngx_cpymem(p, s->salt.data, s->salt.len); |
| |
| s->out.len = p - s->out.data; |
| |
| } else { |
| ngx_str_set(&s->out, pop3_greeting); |
| } |
| |
| c->read->handler = ngx_mail_pop3_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_pop3_init_protocol(ngx_event_t *rev) |
| { |
| ngx_connection_t *c; |
| ngx_mail_session_t *s; |
| |
| 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; |
| } |
| |
| s->buffer = ngx_create_temp_buf(c->pool, 128); |
| if (s->buffer == NULL) { |
| ngx_mail_session_internal_server_error(s); |
| return; |
| } |
| } |
| |
| s->mail_state = ngx_pop3_start; |
| c->read->handler = ngx_mail_pop3_auth_state; |
| |
| ngx_mail_pop3_auth_state(rev); |
| } |
| |
| |
| void |
| ngx_mail_pop3_auth_state(ngx_event_t *rev) |
| { |
| ngx_int_t rc; |
| 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, "pop3 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, "pop3 send handler busy"); |
| s->blocked = 1; |
| |
| if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
| ngx_mail_close_connection(c); |
| return; |
| } |
| |
| return; |
| } |
| |
| s->blocked = 0; |
| |
| rc = ngx_mail_read_command(s, c); |
| |
| if (rc == NGX_AGAIN) { |
| if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
| ngx_mail_session_internal_server_error(s); |
| return; |
| } |
| |
| return; |
| } |
| |
| if (rc == NGX_ERROR) { |
| return; |
| } |
| |
| ngx_str_set(&s->out, pop3_ok); |
| |
| if (rc == NGX_OK) { |
| switch (s->mail_state) { |
| |
| case ngx_pop3_start: |
| |
| switch (s->command) { |
| |
| case NGX_POP3_USER: |
| rc = ngx_mail_pop3_user(s, c); |
| break; |
| |
| case NGX_POP3_CAPA: |
| rc = ngx_mail_pop3_capa(s, c, 1); |
| break; |
| |
| case NGX_POP3_APOP: |
| rc = ngx_mail_pop3_apop(s, c); |
| break; |
| |
| case NGX_POP3_AUTH: |
| rc = ngx_mail_pop3_auth(s, c); |
| break; |
| |
| case NGX_POP3_QUIT: |
| s->quit = 1; |
| break; |
| |
| case NGX_POP3_NOOP: |
| break; |
| |
| case NGX_POP3_STLS: |
| rc = ngx_mail_pop3_stls(s, c); |
| break; |
| |
| default: |
| rc = NGX_MAIL_PARSE_INVALID_COMMAND; |
| break; |
| } |
| |
| break; |
| |
| case ngx_pop3_user: |
| |
| switch (s->command) { |
| |
| case NGX_POP3_PASS: |
| rc = ngx_mail_pop3_pass(s, c); |
| break; |
| |
| case NGX_POP3_CAPA: |
| rc = ngx_mail_pop3_capa(s, c, 0); |
| break; |
| |
| case NGX_POP3_QUIT: |
| s->quit = 1; |
| break; |
| |
| case NGX_POP3_NOOP: |
| break; |
| |
| default: |
| rc = NGX_MAIL_PARSE_INVALID_COMMAND; |
| break; |
| } |
| |
| break; |
| |
| /* suppress warnings */ |
| case ngx_pop3_passwd: |
| break; |
| |
| case ngx_pop3_auth_login_username: |
| rc = ngx_mail_auth_login_username(s, c, 0); |
| |
| ngx_str_set(&s->out, pop3_password); |
| s->mail_state = ngx_pop3_auth_login_password; |
| break; |
| |
| case ngx_pop3_auth_login_password: |
| rc = ngx_mail_auth_login_password(s, c); |
| break; |
| |
| case ngx_pop3_auth_plain: |
| rc = ngx_mail_auth_plain(s, c, 0); |
| break; |
| |
| case ngx_pop3_auth_cram_md5: |
| rc = ngx_mail_auth_cram_md5(s, c); |
| break; |
| |
| case ngx_pop3_auth_external: |
| rc = ngx_mail_auth_external(s, c, 0); |
| break; |
| } |
| } |
| |
| 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->mail_state = ngx_pop3_start; |
| s->state = 0; |
| |
| ngx_str_set(&s->out, pop3_invalid_command); |
| |
| /* fall through */ |
| |
| case NGX_OK: |
| |
| s->args.nelts = 0; |
| s->buffer->pos = s->buffer->start; |
| s->buffer->last = s->buffer->start; |
| |
| if (s->state) { |
| s->arg_start = s->buffer->start; |
| } |
| |
| if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
| ngx_mail_session_internal_server_error(s); |
| return; |
| } |
| |
| ngx_mail_send(c->write); |
| } |
| } |
| |
| static ngx_int_t |
| ngx_mail_pop3_user(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 |
| |
| if (s->args.nelts != 1) { |
| return NGX_MAIL_PARSE_INVALID_COMMAND; |
| } |
| |
| arg = s->args.elts; |
| 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); |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, |
| "pop3 login: \"%V\"", &s->login); |
| |
| s->mail_state = ngx_pop3_user; |
| |
| return NGX_OK; |
| } |
| |
| |
| static ngx_int_t |
| ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c) |
| { |
| ngx_str_t *arg; |
| |
| if (s->args.nelts != 1) { |
| return NGX_MAIL_PARSE_INVALID_COMMAND; |
| } |
| |
| arg = s->args.elts; |
| s->passwd.len = arg[0].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[0].data, s->passwd.len); |
| |
| #if (NGX_DEBUG_MAIL_PASSWD) |
| ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, |
| "pop3 passwd: \"%V\"", &s->passwd); |
| #endif |
| |
| return NGX_DONE; |
| } |
| |
| |
| static ngx_int_t |
| ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, ngx_int_t stls) |
| { |
| ngx_mail_pop3_srv_conf_t *pscf; |
| |
| pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
| |
| #if (NGX_MAIL_SSL) |
| |
| if (stls && 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->out = pscf->starttls_capability; |
| return NGX_OK; |
| } |
| |
| if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) { |
| s->out = pscf->starttls_only_capability; |
| return NGX_OK; |
| } |
| } |
| |
| #endif |
| |
| s->out = pscf->capability; |
| return NGX_OK; |
| } |
| |
| |
| static ngx_int_t |
| ngx_mail_pop3_stls(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; |
| } |
| |
| |
| static ngx_int_t |
| ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c) |
| { |
| ngx_str_t *arg; |
| ngx_mail_pop3_srv_conf_t *pscf; |
| |
| #if (NGX_MAIL_SSL) |
| if (ngx_mail_starttls_only(s, c)) { |
| return NGX_MAIL_PARSE_INVALID_COMMAND; |
| } |
| #endif |
| |
| if (s->args.nelts != 2) { |
| return NGX_MAIL_PARSE_INVALID_COMMAND; |
| } |
| |
| pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
| |
| if (!(pscf->auth_methods & NGX_MAIL_AUTH_APOP_ENABLED)) { |
| return NGX_MAIL_PARSE_INVALID_COMMAND; |
| } |
| |
| arg = s->args.elts; |
| |
| 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); |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0, |
| "pop3 apop: \"%V\" \"%V\"", &s->login, &s->passwd); |
| |
| s->auth_method = NGX_MAIL_AUTH_APOP; |
| |
| return NGX_DONE; |
| } |
| |
| |
| static ngx_int_t |
| ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c) |
| { |
| ngx_int_t rc; |
| ngx_mail_pop3_srv_conf_t *pscf; |
| |
| #if (NGX_MAIL_SSL) |
| if (ngx_mail_starttls_only(s, c)) { |
| return NGX_MAIL_PARSE_INVALID_COMMAND; |
| } |
| #endif |
| |
| pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
| |
| if (s->args.nelts == 0) { |
| s->out = pscf->auth_capability; |
| s->state = 0; |
| |
| return NGX_OK; |
| } |
| |
| rc = ngx_mail_auth_parse(s, c); |
| |
| switch (rc) { |
| |
| case NGX_MAIL_AUTH_LOGIN: |
| |
| ngx_str_set(&s->out, pop3_username); |
| s->mail_state = ngx_pop3_auth_login_username; |
| |
| return NGX_OK; |
| |
| case NGX_MAIL_AUTH_LOGIN_USERNAME: |
| |
| ngx_str_set(&s->out, pop3_password); |
| s->mail_state = ngx_pop3_auth_login_password; |
| |
| return ngx_mail_auth_login_username(s, c, 1); |
| |
| case NGX_MAIL_AUTH_PLAIN: |
| |
| ngx_str_set(&s->out, pop3_next); |
| s->mail_state = ngx_pop3_auth_plain; |
| |
| return NGX_OK; |
| |
| case NGX_MAIL_AUTH_CRAM_MD5: |
| |
| if (!(pscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) { |
| return NGX_MAIL_PARSE_INVALID_COMMAND; |
| } |
| |
| if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) { |
| s->mail_state = ngx_pop3_auth_cram_md5; |
| return NGX_OK; |
| } |
| |
| return NGX_ERROR; |
| |
| case NGX_MAIL_AUTH_EXTERNAL: |
| |
| if (!(pscf->auth_methods & NGX_MAIL_AUTH_EXTERNAL_ENABLED)) { |
| return NGX_MAIL_PARSE_INVALID_COMMAND; |
| } |
| |
| ngx_str_set(&s->out, pop3_username); |
| s->mail_state = ngx_pop3_auth_external; |
| |
| return NGX_OK; |
| } |
| |
| return rc; |
| } |