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326
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10 #include <ngx_mail.h>
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11 #include <ngx_mail_smtp_module.h>
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12
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13
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14 static void ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev);
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15 static ngx_int_t ngx_mail_smtp_create_buffer(ngx_mail_session_t *s,
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16 ngx_connection_t *c);
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17
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18 static ngx_int_t ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c);
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19 static ngx_int_t ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c);
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20 static ngx_int_t ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c);
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21 static ngx_int_t ngx_mail_smtp_starttls(ngx_mail_session_t *s,
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22 ngx_connection_t *c);
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23
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24 static ngx_int_t ngx_mail_smtp_discard_command(ngx_mail_session_t *s,
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25 ngx_connection_t *c, char *err);
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26 static void ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s,
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27 ngx_connection_t *c, char *err);
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28
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29
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30 static u_char smtp_ok[] = "250 2.0.0 OK" CRLF;
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31 static u_char smtp_bye[] = "221 2.0.0 Bye" CRLF;
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330
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32 static u_char smtp_starttls[] = "220 2.0.0 Start TLS" CRLF;
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326
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33 static u_char smtp_next[] = "334 " CRLF;
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34 static u_char smtp_username[] = "334 VXNlcm5hbWU6" CRLF;
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35 static u_char smtp_password[] = "334 UGFzc3dvcmQ6" CRLF;
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36 static u_char smtp_invalid_command[] = "500 5.5.1 Invalid command" CRLF;
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37 static u_char smtp_invalid_pipelining[] =
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38 "503 5.5.0 Improper use of SMTP command pipelining" CRLF;
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39 static u_char smtp_invalid_argument[] = "501 5.5.4 Invalid argument" CRLF;
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40 static u_char smtp_auth_required[] = "530 5.7.1 Authentication required" CRLF;
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41
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42
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43 void
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44 ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
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45 {
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46 ngx_msec_t timeout;
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47 ngx_mail_core_srv_conf_t *cscf;
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48 ngx_mail_smtp_srv_conf_t *sscf;
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49
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50 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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51 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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52
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53 timeout = sscf->greeting_delay ? sscf->greeting_delay : cscf->timeout;
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54 ngx_add_timer(c->read, timeout);
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55
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56 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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57 ngx_mail_close_connection(c);
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58 }
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59
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60 if (sscf->greeting_delay) {
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61 c->read->handler = ngx_mail_smtp_invalid_pipelining;
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62 return;
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63 }
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64
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65 c->read->handler = ngx_mail_smtp_init_protocol;
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66
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67 s->out = sscf->greeting;
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68
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69 ngx_mail_send(c->write);
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70 }
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71
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72
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73 static void
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74 ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev)
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75 {
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76 ngx_connection_t *c;
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77 ngx_mail_session_t *s;
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78 ngx_mail_core_srv_conf_t *cscf;
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79 ngx_mail_smtp_srv_conf_t *sscf;
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80
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81 c = rev->data;
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82 s = c->data;
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83
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84 c->log->action = "in delay pipelining state";
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85
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86 if (rev->timedout) {
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87
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88 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "delay greeting");
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89
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90 rev->timedout = 0;
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91
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92 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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93
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94 c->read->handler = ngx_mail_smtp_init_protocol;
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95
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96 ngx_add_timer(c->read, cscf->timeout);
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97
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98 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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99 ngx_mail_close_connection(c);
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100 return;
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101 }
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102
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103 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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104
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105 s->out = sscf->greeting;
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106
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107 } else {
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108
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109 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "invalid pipelining");
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110
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111 if (s->buffer == NULL) {
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112 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
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113 return;
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114 }
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115 }
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116
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117 if (ngx_mail_smtp_discard_command(s, c,
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118 "client was rejected before greeting: \"%V\"")
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119 != NGX_OK)
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120 {
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121 return;
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122 }
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123
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124 s->out.len = sizeof(smtp_invalid_pipelining) - 1;
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125 s->out.data = smtp_invalid_pipelining;
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126 }
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127
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128 ngx_mail_send(c->write);
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129 }
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130
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131
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132 void
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133 ngx_mail_smtp_init_protocol(ngx_event_t *rev)
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134 {
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135 ngx_connection_t *c;
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136 ngx_mail_session_t *s;
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137
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138 c = rev->data;
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139
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140 c->log->action = "in auth state";
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141
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142 if (rev->timedout) {
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143 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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144 c->timedout = 1;
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145 ngx_mail_close_connection(c);
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146 return;
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147 }
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148
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149 s = c->data;
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150
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151 if (s->buffer == NULL) {
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152 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
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153 return;
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154 }
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155 }
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156
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157 s->mail_state = ngx_smtp_start;
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158 c->read->handler = ngx_mail_smtp_auth_state;
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159
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160 ngx_mail_smtp_auth_state(rev);
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161 }
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162
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163
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164 static ngx_int_t
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165 ngx_mail_smtp_create_buffer(ngx_mail_session_t *s, ngx_connection_t *c)
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166 {
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167 ngx_mail_smtp_srv_conf_t *sscf;
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168
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169 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) == NGX_ERROR) {
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170 ngx_mail_session_internal_server_error(s);
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171 return NGX_ERROR;
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172 }
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173
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174 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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175
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176 s->buffer = ngx_create_temp_buf(c->pool, sscf->client_buffer_size);
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177 if (s->buffer == NULL) {
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178 ngx_mail_session_internal_server_error(s);
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179 return NGX_ERROR;
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180 }
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181
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182 return NGX_OK;
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183 }
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184
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185
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186 void
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187 ngx_mail_smtp_auth_state(ngx_event_t *rev)
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188 {
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189 ngx_int_t rc;
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190 ngx_connection_t *c;
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191 ngx_mail_session_t *s;
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192
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193 c = rev->data;
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194 s = c->data;
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195
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196 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp auth state");
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197
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198 if (rev->timedout) {
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199 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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200 c->timedout = 1;
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201 ngx_mail_close_connection(c);
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202 return;
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203 }
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204
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205 if (s->out.len) {
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206 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp send handler busy");
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207 s->blocked = 1;
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208 return;
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209 }
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210
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211 s->blocked = 0;
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212
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213 rc = ngx_mail_read_command(s, c);
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214
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215 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
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216 return;
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217 }
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218
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219 s->out.len = sizeof(smtp_ok) - 1;
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220 s->out.data = smtp_ok;
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221
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222 if (rc == NGX_OK) {
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223 switch (s->mail_state) {
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224
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225 case ngx_smtp_start:
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226
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227 switch (s->command) {
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228
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229 case NGX_SMTP_HELO:
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230 case NGX_SMTP_EHLO:
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231 rc = ngx_mail_smtp_helo(s, c);
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232 break;
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233
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234 case NGX_SMTP_AUTH:
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235 rc = ngx_mail_smtp_auth(s, c);
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236 break;
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237
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238 case NGX_SMTP_QUIT:
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239 s->quit = 1;
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240 s->out.len = sizeof(smtp_bye) - 1;
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241 s->out.data = smtp_bye;
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242 break;
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243
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244 case NGX_SMTP_MAIL:
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245 rc = ngx_mail_smtp_mail(s, c);
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246 break;
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247
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248 case NGX_SMTP_NOOP:
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249 case NGX_SMTP_RSET:
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250 break;
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251
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252 case NGX_SMTP_STARTTLS:
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253 rc = ngx_mail_smtp_starttls(s, c);
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330
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254 s->out.len = sizeof(smtp_starttls) - 1;
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255 s->out.data = smtp_starttls;
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326
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256 break;
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257
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258 default:
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259 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
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260 break;
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261 }
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262
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263 break;
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264
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265 case ngx_smtp_auth_login_username:
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266 rc = ngx_mail_auth_login_username(s, c);
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267
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268 s->out.len = sizeof(smtp_password) - 1;
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269 s->out.data = smtp_password;
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270 s->mail_state = ngx_smtp_auth_login_password;
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271 break;
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272
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273 case ngx_smtp_auth_login_password:
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274 rc = ngx_mail_auth_login_password(s, c);
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275 break;
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276
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277 case ngx_smtp_auth_plain:
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278 rc = ngx_mail_auth_plain(s, c, 0);
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279 break;
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280
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281 case ngx_smtp_auth_cram_md5:
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282 rc = ngx_mail_auth_cram_md5(s, c);
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283 break;
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284 }
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285 }
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286
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287 switch (rc) {
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288
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289 case NGX_DONE:
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290 ngx_mail_auth(s, c);
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291 return;
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292
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293 case NGX_ERROR:
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294 ngx_mail_session_internal_server_error(s);
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295 return;
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296
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297 case NGX_MAIL_PARSE_INVALID_COMMAND:
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298 s->mail_state = ngx_smtp_start;
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299 s->state = 0;
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300
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301 s->out.len = sizeof(smtp_invalid_command) - 1;
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302 s->out.data = smtp_invalid_command;
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303
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304 /* fall through */
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305
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306 case NGX_OK:
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307 s->args.nelts = 0;
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308 s->buffer->pos = s->buffer->start;
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309 s->buffer->last = s->buffer->start;
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310
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311 if (s->state) {
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312 s->arg_start = s->buffer->start;
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313 }
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314
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315 ngx_mail_send(c->write);
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316 }
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317 }
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318
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319
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320 static ngx_int_t
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321 ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c)
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322 {
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323 ngx_str_t *arg;
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324 ngx_mail_smtp_srv_conf_t *sscf;
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325 #if (NGX_MAIL_SSL)
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326 ngx_mail_ssl_conf_t *sslcf;
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327 #endif
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328
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329 if (s->args.nelts != 1) {
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330 s->out.len = sizeof(smtp_invalid_argument) - 1;
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331 s->out.data = smtp_invalid_argument;
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332 s->state = 0;
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333 return NGX_OK;
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334 }
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335
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336 arg = s->args.elts;
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337
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338 s->smtp_helo.len = arg[0].len;
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339
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340 s->smtp_helo.data = ngx_palloc(c->pool, arg[0].len);
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341 if (s->smtp_helo.data == NULL) {
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342 return NGX_ERROR;
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343 }
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344
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345 ngx_memcpy(s->smtp_helo.data, arg[0].data, arg[0].len);
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346
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347 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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348
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349 if (s->command == NGX_SMTP_HELO) {
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350 s->out = sscf->server_name;
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351
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352 } else {
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353 s->esmtp = 1;
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354
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355 #if (NGX_MAIL_SSL)
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356
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357 if (c->ssl == NULL) {
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358 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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359
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360 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
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361 s->out = sscf->starttls_capability;
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362 return NGX_OK;
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363 }
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364
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365 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
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366 s->out = sscf->starttls_only_capability;
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367 return NGX_OK;
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368 }
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369 }
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370 #endif
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371
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372 s->out = sscf->capability;
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373 }
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374
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375 return NGX_OK;
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376 }
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377
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378
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379 static ngx_int_t
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380 ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c)
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381 {
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382 ngx_int_t rc;
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383 ngx_mail_core_srv_conf_t *cscf;
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384 ngx_mail_smtp_srv_conf_t *sscf;
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385
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386 #if (NGX_MAIL_SSL)
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387 if (ngx_mail_starttls_only(s, c)) {
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388 return NGX_MAIL_PARSE_INVALID_COMMAND;
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389 }
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390 #endif
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391
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392 if (s->args.nelts == 0) {
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393 s->out.len = sizeof(smtp_invalid_argument) - 1;
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394 s->out.data = smtp_invalid_argument;
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395 s->state = 0;
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396 return NGX_OK;
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397 }
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398
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399 rc = ngx_mail_auth_parse(s, c);
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400
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401 switch (rc) {
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402
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403 case NGX_MAIL_AUTH_LOGIN:
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404
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405 s->out.len = sizeof(smtp_username) - 1;
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406 s->out.data = smtp_username;
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407 s->mail_state = ngx_smtp_auth_login_username;
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408
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409 return NGX_OK;
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410
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411 case NGX_MAIL_AUTH_PLAIN:
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412
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413 s->out.len = sizeof(smtp_next) - 1;
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414 s->out.data = smtp_next;
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415 s->mail_state = ngx_smtp_auth_plain;
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416
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417 return NGX_OK;
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418
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419 case NGX_MAIL_AUTH_CRAM_MD5:
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420
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421 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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422
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423 if (!(sscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
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424 return NGX_MAIL_PARSE_INVALID_COMMAND;
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|
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425 }
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426
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|
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427 if (s->salt.data == NULL) {
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428 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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|
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429
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430 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
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431 return NGX_ERROR;
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|
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432 }
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|
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433 }
|
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434
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|
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435 if (ngx_mail_auth_cram_md5_salt(s, c, "334 ", 4) == NGX_OK) {
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436 s->mail_state = ngx_smtp_auth_cram_md5;
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437 return NGX_OK;
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|
|
438 }
|
|
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439
|
|
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440 return NGX_ERROR;
|
|
|
441 }
|
|
|
442
|
|
|
443 return rc;
|
|
|
444 }
|
|
|
445
|
|
|
446
|
|
|
447 static ngx_int_t
|
|
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448 ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
449 {
|
|
|
450 ngx_mail_smtp_log_rejected_command(s, c, "client was rejected: \"%V\"");
|
|
|
451
|
|
|
452 s->out.len = sizeof(smtp_auth_required) - 1;
|
|
|
453 s->out.data = smtp_auth_required;
|
|
|
454
|
|
|
455 return NGX_OK;
|
|
|
456 }
|
|
|
457
|
|
|
458
|
|
|
459 static ngx_int_t
|
|
|
460 ngx_mail_smtp_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
461 {
|
|
|
462 #if (NGX_MAIL_SSL)
|
|
|
463 ngx_mail_ssl_conf_t *sslcf;
|
|
|
464
|
|
|
465 if (c->ssl == NULL) {
|
|
|
466 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
467 if (sslcf->starttls) {
|
|
|
468
|
|
|
469 /*
|
|
|
470 * RFC3207 requires us to discard any knowledge
|
|
|
471 * obtained from client before STARTTLS.
|
|
|
472 */
|
|
|
473
|
|
|
474 s->smtp_helo.len = 0;
|
|
|
475 s->smtp_helo.data = NULL;
|
|
|
476
|
|
|
477 c->read->handler = ngx_mail_starttls_handler;
|
|
|
478 return NGX_OK;
|
|
|
479 }
|
|
|
480 }
|
|
|
481
|
|
|
482 #endif
|
|
|
483
|
|
|
484 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
485 }
|
|
|
486
|
|
|
487
|
|
|
488 static ngx_int_t
|
|
|
489 ngx_mail_smtp_discard_command(ngx_mail_session_t *s, ngx_connection_t *c,
|
|
|
490 char *err)
|
|
|
491 {
|
|
|
492 ssize_t n;
|
|
|
493
|
|
|
494 n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last);
|
|
|
495
|
|
|
496 if (n == NGX_ERROR || n == 0) {
|
|
|
497 ngx_mail_close_connection(c);
|
|
|
498 return NGX_ERROR;
|
|
|
499 }
|
|
|
500
|
|
|
501 if (n > 0) {
|
|
|
502 s->buffer->last += n;
|
|
|
503 }
|
|
|
504
|
|
|
505 if (n == NGX_AGAIN) {
|
|
|
506 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
|
|
|
507 ngx_mail_session_internal_server_error(s);
|
|
|
508 return NGX_ERROR;
|
|
|
509 }
|
|
|
510
|
|
|
511 return NGX_AGAIN;
|
|
|
512 }
|
|
|
513
|
|
|
514 ngx_mail_smtp_log_rejected_command(s, c, err);
|
|
|
515
|
|
|
516 s->buffer->pos = s->buffer->start;
|
|
|
517 s->buffer->last = s->buffer->start;
|
|
|
518
|
|
|
519 return NGX_OK;
|
|
|
520 }
|
|
|
521
|
|
|
522
|
|
|
523 static void
|
|
|
524 ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s, ngx_connection_t *c,
|
|
|
525 char *err)
|
|
|
526 {
|
|
|
527 u_char ch;
|
|
|
528 ngx_str_t cmd;
|
|
|
529 ngx_uint_t i;
|
|
|
530
|
|
|
531 if (c->log->log_level < NGX_LOG_INFO) {
|
|
|
532 return;
|
|
|
533 }
|
|
|
534
|
|
|
535 cmd.len = s->buffer->last - s->buffer->start;
|
|
|
536 cmd.data = s->buffer->start;
|
|
|
537
|
|
|
538 for (i = 0; i < cmd.len; i++) {
|
|
|
539 ch = cmd.data[i];
|
|
|
540
|
|
|
541 if (ch != CR && ch != LF) {
|
|
|
542 continue;
|
|
|
543 }
|
|
|
544
|
|
|
545 cmd.data[i] = '_';
|
|
|
546 }
|
|
|
547
|
|
|
548 cmd.len = i;
|
|
|
549
|
|
|
550 ngx_log_error(NGX_LOG_INFO, c->log, 0, err, &cmd);
|
|
|
551 }
|
