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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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366
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14 static void ngx_mail_smtp_resolve_addr_handler(ngx_resolver_ctx_t *ctx);
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384
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15 static void ngx_mail_smtp_resolve_name(ngx_event_t *rev);
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366
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16 static void ngx_mail_smtp_resolve_name_handler(ngx_resolver_ctx_t *ctx);
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17 static void ngx_mail_smtp_greeting(ngx_mail_session_t *s, ngx_connection_t *c);
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336
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18 static void ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev);
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19 static ngx_int_t ngx_mail_smtp_create_buffer(ngx_mail_session_t *s,
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20 ngx_connection_t *c);
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21
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22 static ngx_int_t ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c);
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23 static ngx_int_t ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c);
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24 static ngx_int_t ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c);
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25 static ngx_int_t ngx_mail_smtp_starttls(ngx_mail_session_t *s,
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26 ngx_connection_t *c);
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27
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28 static ngx_int_t ngx_mail_smtp_discard_command(ngx_mail_session_t *s,
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29 ngx_connection_t *c, char *err);
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30 static void ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s,
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31 ngx_connection_t *c, char *err);
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32
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33
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34 static u_char smtp_ok[] = "250 2.0.0 OK" CRLF;
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35 static u_char smtp_bye[] = "221 2.0.0 Bye" CRLF;
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358
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36 static u_char smtp_starttls[] = "220 2.0.0 Start TLS" CRLF;
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336
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37 static u_char smtp_next[] = "334 " CRLF;
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38 static u_char smtp_username[] = "334 VXNlcm5hbWU6" CRLF;
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39 static u_char smtp_password[] = "334 UGFzc3dvcmQ6" CRLF;
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40 static u_char smtp_invalid_command[] = "500 5.5.1 Invalid command" CRLF;
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41 static u_char smtp_invalid_pipelining[] =
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42 "503 5.5.0 Improper use of SMTP command pipelining" CRLF;
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43 static u_char smtp_invalid_argument[] = "501 5.5.4 Invalid argument" CRLF;
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44 static u_char smtp_auth_required[] = "530 5.7.1 Authentication required" CRLF;
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45
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46
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366
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47 static ngx_str_t smtp_unavailable = ngx_string("[UNAVAILABLE]");
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48 static ngx_str_t smtp_tempunavail = ngx_string("[TEMPUNAVAIL]");
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49
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50
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336
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51 void
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52 ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
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53 {
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366
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54 struct sockaddr_in *sin;
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55 ngx_resolver_ctx_t *ctx;
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56 ngx_mail_core_srv_conf_t *cscf;
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57
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58 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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59
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60 if (cscf->resolver == NULL) {
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61 s->host = smtp_unavailable;
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62 ngx_mail_smtp_greeting(s, c);
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63 return;
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64 }
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65
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66 c->log->action = "in resolving client address";
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67
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68 ctx = ngx_resolve_start(cscf->resolver, NULL);
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69 if (ctx == NULL) {
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70 ngx_mail_close_connection(c);
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71 return;
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72 }
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73
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74 /* AF_INET only */
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75
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76 sin = (struct sockaddr_in *) c->sockaddr;
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77
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78 ctx->addr = sin->sin_addr.s_addr;
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79 ctx->handler = ngx_mail_smtp_resolve_addr_handler;
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80 ctx->data = s;
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81 ctx->timeout = cscf->resolver_timeout;
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82
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83 if (ngx_resolve_addr(ctx) != NGX_OK) {
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84 ngx_mail_close_connection(c);
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85 }
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86 }
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87
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88
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89 static void
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90 ngx_mail_smtp_resolve_addr_handler(ngx_resolver_ctx_t *ctx)
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91 {
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384
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92 ngx_connection_t *c;
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93 ngx_mail_session_t *s;
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366
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94
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95 s = ctx->data;
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96 c = s->connection;
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97
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98 if (ctx->state) {
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99 ngx_log_error(NGX_LOG_ERR, c->log, 0,
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100 "%V could not be resolved (%i: %s)",
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101 &c->addr_text, ctx->state,
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102 ngx_resolver_strerror(ctx->state));
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103
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104 if (ctx->state == NGX_RESOLVE_NXDOMAIN) {
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105 s->host = smtp_unavailable;
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106
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107 } else {
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108 s->host = smtp_tempunavail;
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109 }
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110
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111 ngx_resolve_addr_done(ctx);
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112
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113 ngx_mail_smtp_greeting(s, s->connection);
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114
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115 return;
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116 }
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117
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118 c->log->action = "in resolving client hostname";
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119
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120 s->host.data = ngx_pstrdup(c->pool, &ctx->name);
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121 if (s->host.data == NULL) {
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122 ngx_resolve_addr_done(ctx);
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123 ngx_mail_close_connection(c);
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124 return;
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125 }
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126
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127 s->host.len = ctx->name.len;
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128
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129 ngx_resolve_addr_done(ctx);
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130
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131 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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132 "address resolved: %V", &s->host);
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133
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384
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134 c->read->handler = ngx_mail_smtp_resolve_name;
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135
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136 ngx_post_event(c->read, &ngx_posted_events);
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137 }
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138
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139
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140 static void
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141 ngx_mail_smtp_resolve_name(ngx_event_t *rev)
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142 {
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143 ngx_connection_t *c;
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144 ngx_mail_session_t *s;
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145 ngx_resolver_ctx_t *ctx;
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146 ngx_mail_core_srv_conf_t *cscf;
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147
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148 c = rev->data;
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149 s = c->data;
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150
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366
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151 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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152
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153 ctx = ngx_resolve_start(cscf->resolver, NULL);
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154 if (ctx == NULL) {
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155 ngx_mail_close_connection(c);
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156 return;
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157 }
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158
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159 ctx->name = s->host;
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160 ctx->type = NGX_RESOLVE_A;
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161 ctx->handler = ngx_mail_smtp_resolve_name_handler;
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162 ctx->data = s;
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163 ctx->timeout = cscf->resolver_timeout;
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164
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165 if (ngx_resolve_name(ctx) != NGX_OK) {
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166 ngx_mail_close_connection(c);
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167 }
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168 }
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169
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170
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171 static void
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172 ngx_mail_smtp_resolve_name_handler(ngx_resolver_ctx_t *ctx)
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173 {
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174 in_addr_t addr;
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175 ngx_uint_t i;
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176 ngx_connection_t *c;
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177 struct sockaddr_in *sin;
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178 ngx_mail_session_t *s;
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179
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180 s = ctx->data;
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181 c = s->connection;
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182
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183 if (ctx->state) {
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184 ngx_log_error(NGX_LOG_ERR, c->log, 0,
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185 "%V could not be resolved (%i: %s)",
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186 &ctx->name, ctx->state,
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187 ngx_resolver_strerror(ctx->state));
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188
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189 if (ctx->state == NGX_RESOLVE_NXDOMAIN) {
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190 s->host = smtp_unavailable;
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191
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192 } else {
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193 s->host = smtp_tempunavail;
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194 }
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195
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196 } else {
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197
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198 /* AF_INET only */
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199
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200 sin = (struct sockaddr_in *) c->sockaddr;
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201
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202 for (i = 0; i < ctx->naddrs; i++) {
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203
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204 addr = ctx->addrs[i];
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205
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206 ngx_log_debug4(NGX_LOG_DEBUG_MAIL, c->log, 0,
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207 "name was resolved to %ud.%ud.%ud.%ud",
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208 (ntohl(addr) >> 24) & 0xff,
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209 (ntohl(addr) >> 16) & 0xff,
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210 (ntohl(addr) >> 8) & 0xff,
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211 ntohl(addr) & 0xff);
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212
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213 if (addr == sin->sin_addr.s_addr) {
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214 goto found;
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215 }
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216 }
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217
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218 s->host = smtp_unavailable;
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219 }
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220
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221 found:
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222
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223 ngx_resolve_name_done(ctx);
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224
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225 ngx_mail_smtp_greeting(s, c);
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226 }
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227
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228
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229 static void
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230 ngx_mail_smtp_greeting(ngx_mail_session_t *s, ngx_connection_t *c)
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231 {
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336
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232 ngx_msec_t timeout;
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233 ngx_mail_core_srv_conf_t *cscf;
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234 ngx_mail_smtp_srv_conf_t *sscf;
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235
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366
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236 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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237 "smtp greeting for \"%V\"", &s->host);
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238
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336
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239 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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240 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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241
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242 timeout = sscf->greeting_delay ? sscf->greeting_delay : cscf->timeout;
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243 ngx_add_timer(c->read, timeout);
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244
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245 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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246 ngx_mail_close_connection(c);
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247 }
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248
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249 if (sscf->greeting_delay) {
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250 c->read->handler = ngx_mail_smtp_invalid_pipelining;
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251 return;
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252 }
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253
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254 c->read->handler = ngx_mail_smtp_init_protocol;
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255
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256 s->out = sscf->greeting;
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257
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258 ngx_mail_send(c->write);
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259 }
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260
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261
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262 static void
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263 ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev)
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264 {
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265 ngx_connection_t *c;
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266 ngx_mail_session_t *s;
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267 ngx_mail_core_srv_conf_t *cscf;
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268 ngx_mail_smtp_srv_conf_t *sscf;
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269
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270 c = rev->data;
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271 s = c->data;
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272
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273 c->log->action = "in delay pipelining state";
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274
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275 if (rev->timedout) {
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276
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277 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "delay greeting");
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278
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279 rev->timedout = 0;
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280
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281 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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282
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283 c->read->handler = ngx_mail_smtp_init_protocol;
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284
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285 ngx_add_timer(c->read, cscf->timeout);
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286
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287 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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288 ngx_mail_close_connection(c);
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289 return;
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290 }
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291
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292 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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293
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294 s->out = sscf->greeting;
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295
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296 } else {
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297
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298 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "invalid pipelining");
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299
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300 if (s->buffer == NULL) {
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301 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
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302 return;
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303 }
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304 }
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305
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306 if (ngx_mail_smtp_discard_command(s, c,
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307 "client was rejected before greeting: \"%V\"")
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308 != NGX_OK)
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309 {
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310 return;
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311 }
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312
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313 s->out.len = sizeof(smtp_invalid_pipelining) - 1;
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314 s->out.data = smtp_invalid_pipelining;
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315 }
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316
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317 ngx_mail_send(c->write);
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318 }
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319
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320
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321 void
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322 ngx_mail_smtp_init_protocol(ngx_event_t *rev)
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323 {
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324 ngx_connection_t *c;
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325 ngx_mail_session_t *s;
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326
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327 c = rev->data;
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328
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329 c->log->action = "in auth state";
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330
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331 if (rev->timedout) {
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332 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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333 c->timedout = 1;
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334 ngx_mail_close_connection(c);
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335 return;
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336 }
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337
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338 s = c->data;
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339
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340 if (s->buffer == NULL) {
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341 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
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342 return;
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343 }
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344 }
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345
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346 s->mail_state = ngx_smtp_start;
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347 c->read->handler = ngx_mail_smtp_auth_state;
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348
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349 ngx_mail_smtp_auth_state(rev);
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350 }
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351
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352
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353 static ngx_int_t
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354 ngx_mail_smtp_create_buffer(ngx_mail_session_t *s, ngx_connection_t *c)
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355 {
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356 ngx_mail_smtp_srv_conf_t *sscf;
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357
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358 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) == NGX_ERROR) {
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359 ngx_mail_session_internal_server_error(s);
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360 return NGX_ERROR;
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361 }
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362
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363 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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364
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365 s->buffer = ngx_create_temp_buf(c->pool, sscf->client_buffer_size);
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366 if (s->buffer == NULL) {
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367 ngx_mail_session_internal_server_error(s);
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368 return NGX_ERROR;
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369 }
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370
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371 return NGX_OK;
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372 }
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373
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374
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375 void
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376 ngx_mail_smtp_auth_state(ngx_event_t *rev)
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377 {
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378 ngx_int_t rc;
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379 ngx_connection_t *c;
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380 ngx_mail_session_t *s;
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381
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382 c = rev->data;
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383 s = c->data;
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384
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385 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp auth state");
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386
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387 if (rev->timedout) {
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388 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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389 c->timedout = 1;
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390 ngx_mail_close_connection(c);
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391 return;
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|
392 }
|
|
|
393
|
|
|
394 if (s->out.len) {
|
|
|
395 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp send handler busy");
|
|
|
396 s->blocked = 1;
|
|
|
397 return;
|
|
|
398 }
|
|
|
399
|
|
|
400 s->blocked = 0;
|
|
|
401
|
|
|
402 rc = ngx_mail_read_command(s, c);
|
|
|
403
|
|
|
404 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
|
|
|
405 return;
|
|
|
406 }
|
|
|
407
|
|
|
408 s->out.len = sizeof(smtp_ok) - 1;
|
|
|
409 s->out.data = smtp_ok;
|
|
|
410
|
|
|
411 if (rc == NGX_OK) {
|
|
|
412 switch (s->mail_state) {
|
|
|
413
|
|
|
414 case ngx_smtp_start:
|
|
|
415
|
|
|
416 switch (s->command) {
|
|
|
417
|
|
|
418 case NGX_SMTP_HELO:
|
|
|
419 case NGX_SMTP_EHLO:
|
|
|
420 rc = ngx_mail_smtp_helo(s, c);
|
|
|
421 break;
|
|
|
422
|
|
|
423 case NGX_SMTP_AUTH:
|
|
|
424 rc = ngx_mail_smtp_auth(s, c);
|
|
|
425 break;
|
|
|
426
|
|
|
427 case NGX_SMTP_QUIT:
|
|
|
428 s->quit = 1;
|
|
|
429 s->out.len = sizeof(smtp_bye) - 1;
|
|
|
430 s->out.data = smtp_bye;
|
|
|
431 break;
|
|
|
432
|
|
|
433 case NGX_SMTP_MAIL:
|
|
|
434 rc = ngx_mail_smtp_mail(s, c);
|
|
|
435 break;
|
|
|
436
|
|
|
437 case NGX_SMTP_NOOP:
|
|
|
438 case NGX_SMTP_RSET:
|
|
|
439 break;
|
|
|
440
|
|
|
441 case NGX_SMTP_STARTTLS:
|
|
|
442 rc = ngx_mail_smtp_starttls(s, c);
|
|
358
|
443 s->out.len = sizeof(smtp_starttls) - 1;
|
|
|
444 s->out.data = smtp_starttls;
|
|
336
|
445 break;
|
|
|
446
|
|
|
447 default:
|
|
|
448 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
449 break;
|
|
|
450 }
|
|
|
451
|
|
|
452 break;
|
|
|
453
|
|
|
454 case ngx_smtp_auth_login_username:
|
|
|
455 rc = ngx_mail_auth_login_username(s, c);
|
|
|
456
|
|
|
457 s->out.len = sizeof(smtp_password) - 1;
|
|
|
458 s->out.data = smtp_password;
|
|
|
459 s->mail_state = ngx_smtp_auth_login_password;
|
|
|
460 break;
|
|
|
461
|
|
|
462 case ngx_smtp_auth_login_password:
|
|
|
463 rc = ngx_mail_auth_login_password(s, c);
|
|
|
464 break;
|
|
|
465
|
|
|
466 case ngx_smtp_auth_plain:
|
|
|
467 rc = ngx_mail_auth_plain(s, c, 0);
|
|
|
468 break;
|
|
|
469
|
|
|
470 case ngx_smtp_auth_cram_md5:
|
|
|
471 rc = ngx_mail_auth_cram_md5(s, c);
|
|
|
472 break;
|
|
|
473 }
|
|
|
474 }
|
|
|
475
|
|
|
476 switch (rc) {
|
|
|
477
|
|
|
478 case NGX_DONE:
|
|
|
479 ngx_mail_auth(s, c);
|
|
|
480 return;
|
|
|
481
|
|
|
482 case NGX_ERROR:
|
|
|
483 ngx_mail_session_internal_server_error(s);
|
|
|
484 return;
|
|
|
485
|
|
|
486 case NGX_MAIL_PARSE_INVALID_COMMAND:
|
|
|
487 s->mail_state = ngx_smtp_start;
|
|
|
488 s->state = 0;
|
|
|
489
|
|
|
490 s->out.len = sizeof(smtp_invalid_command) - 1;
|
|
|
491 s->out.data = smtp_invalid_command;
|
|
|
492
|
|
|
493 /* fall through */
|
|
|
494
|
|
|
495 case NGX_OK:
|
|
|
496 s->args.nelts = 0;
|
|
|
497 s->buffer->pos = s->buffer->start;
|
|
|
498 s->buffer->last = s->buffer->start;
|
|
|
499
|
|
|
500 if (s->state) {
|
|
|
501 s->arg_start = s->buffer->start;
|
|
|
502 }
|
|
|
503
|
|
|
504 ngx_mail_send(c->write);
|
|
|
505 }
|
|
|
506 }
|
|
|
507
|
|
|
508
|
|
|
509 static ngx_int_t
|
|
|
510 ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
511 {
|
|
|
512 ngx_str_t *arg;
|
|
|
513 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
514
|
|
|
515 if (s->args.nelts != 1) {
|
|
|
516 s->out.len = sizeof(smtp_invalid_argument) - 1;
|
|
|
517 s->out.data = smtp_invalid_argument;
|
|
|
518 s->state = 0;
|
|
|
519 return NGX_OK;
|
|
|
520 }
|
|
|
521
|
|
|
522 arg = s->args.elts;
|
|
|
523
|
|
|
524 s->smtp_helo.len = arg[0].len;
|
|
|
525
|
|
|
526 s->smtp_helo.data = ngx_palloc(c->pool, arg[0].len);
|
|
|
527 if (s->smtp_helo.data == NULL) {
|
|
|
528 return NGX_ERROR;
|
|
|
529 }
|
|
|
530
|
|
|
531 ngx_memcpy(s->smtp_helo.data, arg[0].data, arg[0].len);
|
|
|
532
|
|
|
533 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
534
|
|
|
535 if (s->command == NGX_SMTP_HELO) {
|
|
|
536 s->out = sscf->server_name;
|
|
|
537
|
|
|
538 } else {
|
|
|
539 s->esmtp = 1;
|
|
|
540
|
|
|
541 #if (NGX_MAIL_SSL)
|
|
|
542
|
|
|
543 if (c->ssl == NULL) {
|
|
356
|
544 ngx_mail_ssl_conf_t *sslcf;
|
|
|
545
|
|
336
|
546 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
547
|
|
|
548 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
|
|
|
549 s->out = sscf->starttls_capability;
|
|
|
550 return NGX_OK;
|
|
|
551 }
|
|
|
552
|
|
|
553 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
|
|
|
554 s->out = sscf->starttls_only_capability;
|
|
|
555 return NGX_OK;
|
|
|
556 }
|
|
|
557 }
|
|
|
558 #endif
|
|
|
559
|
|
|
560 s->out = sscf->capability;
|
|
|
561 }
|
|
|
562
|
|
|
563 return NGX_OK;
|
|
|
564 }
|
|
|
565
|
|
|
566
|
|
|
567 static ngx_int_t
|
|
|
568 ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
569 {
|
|
|
570 ngx_int_t rc;
|
|
|
571 ngx_mail_core_srv_conf_t *cscf;
|
|
|
572 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
573
|
|
|
574 #if (NGX_MAIL_SSL)
|
|
|
575 if (ngx_mail_starttls_only(s, c)) {
|
|
|
576 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
577 }
|
|
|
578 #endif
|
|
|
579
|
|
|
580 if (s->args.nelts == 0) {
|
|
|
581 s->out.len = sizeof(smtp_invalid_argument) - 1;
|
|
|
582 s->out.data = smtp_invalid_argument;
|
|
|
583 s->state = 0;
|
|
|
584 return NGX_OK;
|
|
|
585 }
|
|
|
586
|
|
|
587 rc = ngx_mail_auth_parse(s, c);
|
|
|
588
|
|
|
589 switch (rc) {
|
|
|
590
|
|
|
591 case NGX_MAIL_AUTH_LOGIN:
|
|
|
592
|
|
|
593 s->out.len = sizeof(smtp_username) - 1;
|
|
|
594 s->out.data = smtp_username;
|
|
|
595 s->mail_state = ngx_smtp_auth_login_username;
|
|
|
596
|
|
|
597 return NGX_OK;
|
|
|
598
|
|
|
599 case NGX_MAIL_AUTH_PLAIN:
|
|
|
600
|
|
|
601 s->out.len = sizeof(smtp_next) - 1;
|
|
|
602 s->out.data = smtp_next;
|
|
|
603 s->mail_state = ngx_smtp_auth_plain;
|
|
|
604
|
|
|
605 return NGX_OK;
|
|
|
606
|
|
|
607 case NGX_MAIL_AUTH_CRAM_MD5:
|
|
|
608
|
|
|
609 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
610
|
|
|
611 if (!(sscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
|
|
|
612 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
613 }
|
|
|
614
|
|
|
615 if (s->salt.data == NULL) {
|
|
|
616 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
617
|
|
|
618 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
|
|
|
619 return NGX_ERROR;
|
|
|
620 }
|
|
|
621 }
|
|
|
622
|
|
|
623 if (ngx_mail_auth_cram_md5_salt(s, c, "334 ", 4) == NGX_OK) {
|
|
|
624 s->mail_state = ngx_smtp_auth_cram_md5;
|
|
|
625 return NGX_OK;
|
|
|
626 }
|
|
|
627
|
|
|
628 return NGX_ERROR;
|
|
|
629 }
|
|
|
630
|
|
|
631 return rc;
|
|
|
632 }
|
|
|
633
|
|
|
634
|
|
|
635 static ngx_int_t
|
|
|
636 ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
637 {
|
|
|
638 ngx_mail_smtp_log_rejected_command(s, c, "client was rejected: \"%V\"");
|
|
|
639
|
|
|
640 s->out.len = sizeof(smtp_auth_required) - 1;
|
|
|
641 s->out.data = smtp_auth_required;
|
|
|
642
|
|
|
643 return NGX_OK;
|
|
|
644 }
|
|
|
645
|
|
|
646
|
|
|
647 static ngx_int_t
|
|
|
648 ngx_mail_smtp_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
649 {
|
|
|
650 #if (NGX_MAIL_SSL)
|
|
|
651 ngx_mail_ssl_conf_t *sslcf;
|
|
|
652
|
|
|
653 if (c->ssl == NULL) {
|
|
|
654 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
655 if (sslcf->starttls) {
|
|
|
656
|
|
|
657 /*
|
|
|
658 * RFC3207 requires us to discard any knowledge
|
|
|
659 * obtained from client before STARTTLS.
|
|
|
660 */
|
|
|
661
|
|
|
662 s->smtp_helo.len = 0;
|
|
|
663 s->smtp_helo.data = NULL;
|
|
|
664
|
|
|
665 c->read->handler = ngx_mail_starttls_handler;
|
|
|
666 return NGX_OK;
|
|
|
667 }
|
|
|
668 }
|
|
|
669
|
|
|
670 #endif
|
|
|
671
|
|
|
672 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
673 }
|
|
|
674
|
|
|
675
|
|
|
676 static ngx_int_t
|
|
|
677 ngx_mail_smtp_discard_command(ngx_mail_session_t *s, ngx_connection_t *c,
|
|
|
678 char *err)
|
|
|
679 {
|
|
|
680 ssize_t n;
|
|
|
681
|
|
|
682 n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last);
|
|
|
683
|
|
|
684 if (n == NGX_ERROR || n == 0) {
|
|
|
685 ngx_mail_close_connection(c);
|
|
|
686 return NGX_ERROR;
|
|
|
687 }
|
|
|
688
|
|
|
689 if (n > 0) {
|
|
|
690 s->buffer->last += n;
|
|
|
691 }
|
|
|
692
|
|
|
693 if (n == NGX_AGAIN) {
|
|
|
694 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
|
|
|
695 ngx_mail_session_internal_server_error(s);
|
|
|
696 return NGX_ERROR;
|
|
|
697 }
|
|
|
698
|
|
|
699 return NGX_AGAIN;
|
|
|
700 }
|
|
|
701
|
|
|
702 ngx_mail_smtp_log_rejected_command(s, c, err);
|
|
|
703
|
|
|
704 s->buffer->pos = s->buffer->start;
|
|
|
705 s->buffer->last = s->buffer->start;
|
|
|
706
|
|
|
707 return NGX_OK;
|
|
|
708 }
|
|
|
709
|
|
|
710
|
|
|
711 static void
|
|
|
712 ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s, ngx_connection_t *c,
|
|
|
713 char *err)
|
|
|
714 {
|
|
|
715 u_char ch;
|
|
|
716 ngx_str_t cmd;
|
|
|
717 ngx_uint_t i;
|
|
|
718
|
|
|
719 if (c->log->log_level < NGX_LOG_INFO) {
|
|
|
720 return;
|
|
|
721 }
|
|
|
722
|
|
|
723 cmd.len = s->buffer->last - s->buffer->start;
|
|
|
724 cmd.data = s->buffer->start;
|
|
|
725
|
|
|
726 for (i = 0; i < cmd.len; i++) {
|
|
|
727 ch = cmd.data[i];
|
|
|
728
|
|
|
729 if (ch != CR && ch != LF) {
|
|
|
730 continue;
|
|
|
731 }
|
|
|
732
|
|
|
733 cmd.data[i] = '_';
|
|
|
734 }
|
|
|
735
|
|
|
736 cmd.len = i;
|
|
|
737
|
|
|
738 ngx_log_error(NGX_LOG_INFO, c->log, 0, err, &cmd);
|
|
|
739 }
|
