split pop3, imap, and smtp handlers

1 files changed, 449 insertions, 0 deletions

diff --git a/src/mail/ngx_mail_smtp_handler.c b/src/mail/ngx_mail_smtp_handler.c
new file mode 100644
index 000000000..e0018bd26
--- /dev/null
+++ b/src/mail/ngx_mail_smtp_handler.c
@@ -0,0 +1,449 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+#include <ngx_mail.h>
+
+
+static ngx_int_t ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c);
+static ngx_int_t ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c);
+static ngx_int_t ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c);
+static ngx_int_t ngx_mail_smtp_starttls(ngx_mail_session_t *s,
+    ngx_connection_t *c);
+
+
+static u_char  smtp_ok[] = "250 2.0.0 OK" CRLF;
+static u_char  smtp_bye[] = "221 2.0.0 Bye" CRLF;
+static u_char  smtp_next[] = "334 " CRLF;
+static u_char  smtp_username[] = "334 VXNlcm5hbWU6" CRLF;
+static u_char  smtp_password[] = "334 UGFzc3dvcmQ6" CRLF;
+static u_char  smtp_invalid_command[] = "500 5.5.1 Invalid command" CRLF;
+static u_char  smtp_invalid_argument[] = "501 5.5.4 Invalid argument" CRLF;
+static u_char  smtp_auth_required[] = "530 5.7.1 Authentication required" CRLF;
+
+
+void
+ngx_mail_smtp_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);
+
+    if (cscf->smtp_auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) {
+        if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
+            ngx_mail_session_internal_server_error(s);
+            return;
+        }
+    }
+
+    c->read->handler = ngx_mail_smtp_init_protocol;
+
+    s->out = cscf->smtp_greeting;
+
+    ngx_mail_send(c->write);
+}
+
+
+void
+ngx_mail_smtp_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, 512);
+        if (s->buffer == NULL) {
+            ngx_mail_session_internal_server_error(s);
+            return;
+        }
+    }
+
+    s->mail_state = ngx_smtp_start;
+    c->read->handler = ngx_smtp_auth_state;
+
+    ngx_smtp_auth_state(rev);
+}
+
+
+void
+ngx_smtp_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, "smtp 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, "smtp send handler busy");
+        s->blocked = 1;
+        return;
+    }
+
+    s->blocked = 0;
+
+    rc = ngx_mail_read_command(s);
+
+    if (rc == NGX_AGAIN || rc == NGX_ERROR) {
+        return;
+    }
+
+    s->out.len = sizeof(smtp_ok) - 1;
+    s->out.data = smtp_ok;
+
+    if (rc == NGX_OK) {
+        switch (s->mail_state) {
+
+        case ngx_smtp_start:
+
+            switch (s->command) {
+
+            case NGX_SMTP_HELO:
+            case NGX_SMTP_EHLO:
+                rc = ngx_mail_smtp_helo(s, c);
+                break;
+
+            case NGX_SMTP_AUTH:
+                rc = ngx_mail_smtp_auth(s, c);
+                break;
+
+            case NGX_SMTP_QUIT:
+                s->quit = 1;
+                s->out.len = sizeof(smtp_bye) - 1;
+                s->out.data = smtp_bye;
+                break;
+
+            case NGX_SMTP_MAIL:
+                rc = ngx_mail_smtp_mail(s, c);
+                break;
+
+            case NGX_SMTP_NOOP:
+            case NGX_SMTP_RSET:
+                break;
+
+            case NGX_SMTP_STARTTLS:
+                rc = ngx_mail_smtp_starttls(s, c);
+                break;
+
+            default:
+                rc = NGX_MAIL_PARSE_INVALID_COMMAND;
+                break;
+            }
+
+            break;
+
+        case ngx_smtp_auth_login_username:
+            rc = ngx_mail_auth_login_username(s, c);
+
+            s->out.len = sizeof(smtp_password) - 1;
+            s->out.data = smtp_password;
+            s->mail_state = ngx_smtp_auth_login_password;
+            break;
+
+        case ngx_smtp_auth_login_password:
+            rc = ngx_mail_auth_login_password(s, c);
+            break;
+
+        case ngx_smtp_auth_plain:
+            rc = ngx_mail_auth_plain(s, c, 0);
+            break;
+
+        case ngx_smtp_auth_cram_md5:
+            rc = ngx_mail_auth_cram_md5(s, c);
+            break;
+        }
+    }
+
+    switch (rc) {
+
+    case NGX_DONE:
+        ngx_mail_auth(s);
+        return;
+
+    case NGX_ERROR:
+        ngx_mail_session_internal_server_error(s);
+        return;
+
+    case NGX_MAIL_PARSE_INVALID_COMMAND:
+        s->mail_state = ngx_smtp_start;
+        s->state = 0; 
+
+        s->out.len = sizeof(smtp_invalid_command) - 1;
+        s->out.data = smtp_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;
+        }
+
+        ngx_mail_send(c->write);
+    }
+}
+
+
+static ngx_int_t
+ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c)
+{
+    ngx_str_t                 *arg;
+    ngx_mail_core_srv_conf_t  *cscf;
+#if (NGX_MAIL_SSL)
+    ngx_mail_ssl_conf_t       *sslcf;
+#endif
+
+    cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
+
+    if (s->args.nelts != 1) {
+        s->out.len = sizeof(smtp_invalid_argument) - 1;
+        s->out.data = smtp_invalid_argument;
+        s->state = 0;
+        return NGX_OK;
+    }
+
+    arg = s->args.elts;
+
+    s->smtp_helo.len = arg[0].len;
+
+    s->smtp_helo.data = ngx_palloc(c->pool, arg[0].len);
+    if (s->smtp_helo.data == NULL) {
+        return NGX_ERROR;
+    }
+
+    ngx_memcpy(s->smtp_helo.data, arg[0].data, arg[0].len);
+
+    if (s->command == NGX_SMTP_HELO) {
+        s->out = cscf->smtp_server_name;
+
+    } else {
+        s->esmtp = 1;
+
+#if (NGX_MAIL_SSL)
+
+        if (c->ssl == NULL) {
+            sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
+
+            if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
+                s->out = cscf->smtp_starttls_capability;
+                return NGX_OK;
+            }
+
+            if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
+                s->out = cscf->smtp_starttls_only_capability;
+                return NGX_OK;
+            }
+        }
+#endif
+
+        s->out = cscf->smtp_capability;
+    }
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
+ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c)
+{
+    u_char                    *p;
+    ngx_str_t                 *arg, salt;
+    ngx_uint_t                 n;
+    ngx_mail_core_srv_conf_t  *cscf;
+#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 == NGX_MAIL_STARTTLS_ONLY) {
+            return NGX_MAIL_PARSE_INVALID_COMMAND;
+        }
+    }
+
+#endif
+
+    if (s->args.nelts == 0) {
+        s->out.len = sizeof(smtp_invalid_argument) - 1;
+        s->out.data = smtp_invalid_argument;
+        s->state = 0;
+        return NGX_OK;
+    }
+
+    if (s->args.nelts != 1) {
+        return NGX_MAIL_PARSE_INVALID_COMMAND;
+    }
+
+    arg = s->args.elts;
+
+    if (arg[0].len == 5) {
+
+        if (ngx_strncasecmp(arg[0].data, (u_char *) "LOGIN", 5) == 0) {
+
+            if (s->args.nelts != 1) {
+                return NGX_MAIL_PARSE_INVALID_COMMAND;
+            }
+
+            s->out.len = sizeof(smtp_username) - 1;
+            s->out.data = smtp_username;
+            s->mail_state = ngx_smtp_auth_login_username;
+
+            return NGX_OK;
+
+        } else if (ngx_strncasecmp(arg[0].data, (u_char *) "PLAIN", 5) == 0) {
+
+            s->out.len = sizeof(smtp_next) - 1;
+            s->out.data = smtp_next;
+            s->mail_state = ngx_smtp_auth_plain;
+
+            return NGX_OK;
+        }
+
+    } else if (arg[0].len == 8
+               && ngx_strncasecmp(arg[0].data, (u_char *) "CRAM-MD5", 8) == 0)
+    {
+        if (s->args.nelts != 1) {
+            return NGX_MAIL_PARSE_INVALID_COMMAND;
+        }
+
+        cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
+
+        if (!(cscf->smtp_auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
+            return NGX_MAIL_PARSE_INVALID_COMMAND;
+        }
+
+        p = ngx_palloc(c->pool,
+                       sizeof("334 " CRLF) - 1
+                       + ngx_base64_encoded_length(s->salt.len));
+        if (p == NULL) {
+            return NGX_ERROR;
+        }
+
+        p[0] = '3'; p[1]= '3'; p[2] = '4'; p[3]= ' ';
+        salt.data = &p[4];
+        s->salt.len -= 2;
+
+        ngx_encode_base64(&salt, &s->salt);
+
+        s->salt.len += 2;
+        n = 4 + salt.len;
+        p[n++] = CR; p[n++] = LF;
+
+        s->out.len = n;
+        s->out.data = p;
+        s->mail_state = ngx_smtp_auth_cram_md5;
+
+        return NGX_OK;
+    }
+
+    return NGX_MAIL_PARSE_INVALID_COMMAND;
+}
+
+
+static ngx_int_t
+ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c)
+{
+    u_char      ch;
+    ngx_str_t   mail;
+    ngx_uint_t  i;
+
+    if (c->log->log_level >= NGX_LOG_INFO) {
+        mail.len = s->buffer->last - s->buffer->start;
+        mail.data = s->buffer->start;
+
+        for (i = 0; i < mail.len; i++) {
+            ch = mail.data[i];
+
+            if (ch != CR && ch != LF) {
+                continue;
+            }
+
+            mail.data[i] = ' ';
+        }
+
+        while (i) {
+            if (mail.data[i - 1] != ' ') {
+                break;
+            }
+
+            i--;
+        }
+
+        mail.len = i;
+
+        ngx_log_error(NGX_LOG_INFO, s->connection->log, 0,
+                      "client was rejected: \"%V\"", &mail);
+    }
+
+    s->out.len = sizeof(smtp_auth_required) - 1;
+    s->out.data = smtp_auth_required;
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
+ngx_mail_smtp_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) {
+
+            /*
+             * RFC3207 requires us to discard any knowledge
+             * obtained from client before STARTTLS.
+             */
+
+            s->smtp_helo.len = 0;
+            s->smtp_helo.data = NULL;
+
+            c->read->handler = ngx_mail_starttls_handler;
+            return NGX_OK;
+        }
+    }
+
+#endif
+
+    return NGX_MAIL_PARSE_INVALID_COMMAND;
+}