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