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