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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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409
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26 static ngx_int_t ngx_mail_smtp_rset(ngx_mail_session_t *s, ngx_connection_t *c);
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27 static ngx_int_t ngx_mail_smtp_rcpt(ngx_mail_session_t *s, ngx_connection_t *c);
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336
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28
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29 static ngx_int_t ngx_mail_smtp_discard_command(ngx_mail_session_t *s,
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30 ngx_connection_t *c, char *err);
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31 static void ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s,
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32 ngx_connection_t *c, char *err);
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33
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34
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35 static u_char smtp_ok[] = "250 2.0.0 OK" CRLF;
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36 static u_char smtp_bye[] = "221 2.0.0 Bye" CRLF;
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358
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37 static u_char smtp_starttls[] = "220 2.0.0 Start TLS" CRLF;
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336
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38 static u_char smtp_next[] = "334 " CRLF;
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39 static u_char smtp_username[] = "334 VXNlcm5hbWU6" CRLF;
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40 static u_char smtp_password[] = "334 UGFzc3dvcmQ6" CRLF;
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41 static u_char smtp_invalid_command[] = "500 5.5.1 Invalid command" CRLF;
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42 static u_char smtp_invalid_pipelining[] =
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43 "503 5.5.0 Improper use of SMTP command pipelining" CRLF;
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44 static u_char smtp_invalid_argument[] = "501 5.5.4 Invalid argument" CRLF;
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45 static u_char smtp_auth_required[] = "530 5.7.1 Authentication required" CRLF;
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409
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46 static u_char smtp_bad_sequence[] = "503 5.5.1 Bad sequence of commands" CRLF;
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336
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47
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48
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366
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49 static ngx_str_t smtp_unavailable = ngx_string("[UNAVAILABLE]");
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50 static ngx_str_t smtp_tempunavail = ngx_string("[TEMPUNAVAIL]");
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51
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52
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336
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53 void
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54 ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
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55 {
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366
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56 struct sockaddr_in *sin;
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57 ngx_resolver_ctx_t *ctx;
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58 ngx_mail_core_srv_conf_t *cscf;
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59
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60 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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61
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62 if (cscf->resolver == NULL) {
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63 s->host = smtp_unavailable;
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64 ngx_mail_smtp_greeting(s, c);
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65 return;
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66 }
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67
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68 c->log->action = "in resolving client address";
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69
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70 ctx = ngx_resolve_start(cscf->resolver, NULL);
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71 if (ctx == NULL) {
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72 ngx_mail_close_connection(c);
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73 return;
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74 }
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75
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76 /* AF_INET only */
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77
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78 sin = (struct sockaddr_in *) c->sockaddr;
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79
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80 ctx->addr = sin->sin_addr.s_addr;
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81 ctx->handler = ngx_mail_smtp_resolve_addr_handler;
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82 ctx->data = s;
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83 ctx->timeout = cscf->resolver_timeout;
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84
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85 if (ngx_resolve_addr(ctx) != NGX_OK) {
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86 ngx_mail_close_connection(c);
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87 }
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88 }
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89
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90
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91 static void
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92 ngx_mail_smtp_resolve_addr_handler(ngx_resolver_ctx_t *ctx)
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93 {
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94 ngx_connection_t *c;
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95 ngx_mail_session_t *s;
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96 ngx_mail_core_srv_conf_t *cscf;
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97
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98 s = ctx->data;
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99 c = s->connection;
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100
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101 if (ctx->state) {
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102 ngx_log_error(NGX_LOG_ERR, c->log, 0,
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103 "%V could not be resolved (%i: %s)",
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104 &c->addr_text, ctx->state,
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105 ngx_resolver_strerror(ctx->state));
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106
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107 if (ctx->state == NGX_RESOLVE_NXDOMAIN) {
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108 s->host = smtp_unavailable;
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109
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110 } else {
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111 s->host = smtp_tempunavail;
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112 }
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113
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114 ngx_resolve_addr_done(ctx);
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115
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116 ngx_mail_smtp_greeting(s, s->connection);
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117
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118 return;
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119 }
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120
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121 c->log->action = "in resolving client hostname";
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122
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123 s->host.data = ngx_pstrdup(c->pool, &ctx->name);
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124 if (s->host.data == NULL) {
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125 ngx_resolve_addr_done(ctx);
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126 ngx_mail_close_connection(c);
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127 return;
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128 }
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129
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130 s->host.len = ctx->name.len;
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131
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132 ngx_resolve_addr_done(ctx);
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133
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134 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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135 "address resolved: %V", &s->host);
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136
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137 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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138
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139 ctx = ngx_resolve_start(cscf->resolver, NULL);
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140 if (ctx == NULL) {
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141 ngx_mail_close_connection(c);
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142 return;
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143 }
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144
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145 ctx->name = s->host;
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146 ctx->type = NGX_RESOLVE_A;
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147 ctx->handler = ngx_mail_smtp_resolve_name_handler;
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148 ctx->data = s;
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149 ctx->timeout = cscf->resolver_timeout;
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150
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151 if (ngx_resolve_name(ctx) != NGX_OK) {
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152 ngx_mail_close_connection(c);
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153 }
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154 }
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155
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156
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157 static void
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158 ngx_mail_smtp_resolve_name_handler(ngx_resolver_ctx_t *ctx)
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159 {
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160 in_addr_t addr;
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161 ngx_uint_t i;
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162 ngx_connection_t *c;
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163 struct sockaddr_in *sin;
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164 ngx_mail_session_t *s;
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165
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166 s = ctx->data;
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167 c = s->connection;
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168
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169 if (ctx->state) {
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170 ngx_log_error(NGX_LOG_ERR, c->log, 0,
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171 "%V could not be resolved (%i: %s)",
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172 &ctx->name, ctx->state,
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173 ngx_resolver_strerror(ctx->state));
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174
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175 if (ctx->state == NGX_RESOLVE_NXDOMAIN) {
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176 s->host = smtp_unavailable;
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177
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178 } else {
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179 s->host = smtp_tempunavail;
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180 }
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181
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182 } else {
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183
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184 /* AF_INET only */
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185
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186 sin = (struct sockaddr_in *) c->sockaddr;
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187
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188 for (i = 0; i < ctx->naddrs; i++) {
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189
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190 addr = ctx->addrs[i];
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191
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192 ngx_log_debug4(NGX_LOG_DEBUG_MAIL, c->log, 0,
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193 "name was resolved to %ud.%ud.%ud.%ud",
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194 (ntohl(addr) >> 24) & 0xff,
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195 (ntohl(addr) >> 16) & 0xff,
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196 (ntohl(addr) >> 8) & 0xff,
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197 ntohl(addr) & 0xff);
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198
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199 if (addr == sin->sin_addr.s_addr) {
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200 goto found;
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201 }
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202 }
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203
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204 s->host = smtp_unavailable;
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205 }
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206
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207 found:
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208
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209 ngx_resolve_name_done(ctx);
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210
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211 ngx_mail_smtp_greeting(s, c);
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212 }
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213
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214
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215 static void
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216 ngx_mail_smtp_greeting(ngx_mail_session_t *s, ngx_connection_t *c)
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217 {
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336
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218 ngx_msec_t timeout;
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219 ngx_mail_core_srv_conf_t *cscf;
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220 ngx_mail_smtp_srv_conf_t *sscf;
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221
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366
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222 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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223 "smtp greeting for \"%V\"", &s->host);
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224
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336
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225 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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226 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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227
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228 timeout = sscf->greeting_delay ? sscf->greeting_delay : cscf->timeout;
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229 ngx_add_timer(c->read, timeout);
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230
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231 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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232 ngx_mail_close_connection(c);
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233 }
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234
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235 if (sscf->greeting_delay) {
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236 c->read->handler = ngx_mail_smtp_invalid_pipelining;
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237 return;
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238 }
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239
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240 c->read->handler = ngx_mail_smtp_init_protocol;
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241
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242 s->out = sscf->greeting;
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243
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244 ngx_mail_send(c->write);
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245 }
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246
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247
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248 static void
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249 ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev)
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250 {
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251 ngx_connection_t *c;
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252 ngx_mail_session_t *s;
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253 ngx_mail_core_srv_conf_t *cscf;
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254 ngx_mail_smtp_srv_conf_t *sscf;
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255
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256 c = rev->data;
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257 s = c->data;
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258
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259 c->log->action = "in delay pipelining state";
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260
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261 if (rev->timedout) {
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262
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263 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "delay greeting");
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264
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265 rev->timedout = 0;
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266
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267 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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268
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269 c->read->handler = ngx_mail_smtp_init_protocol;
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270
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271 ngx_add_timer(c->read, cscf->timeout);
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272
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273 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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274 ngx_mail_close_connection(c);
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275 return;
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276 }
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277
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278 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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279
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280 s->out = sscf->greeting;
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281
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282 } else {
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283
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284 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "invalid pipelining");
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285
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286 if (s->buffer == NULL) {
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287 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
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288 return;
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289 }
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290 }
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291
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292 if (ngx_mail_smtp_discard_command(s, c,
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293 "client was rejected before greeting: \"%V\"")
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294 != NGX_OK)
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295 {
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296 return;
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297 }
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298
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299 s->out.len = sizeof(smtp_invalid_pipelining) - 1;
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300 s->out.data = smtp_invalid_pipelining;
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301 }
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302
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303 ngx_mail_send(c->write);
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304 }
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305
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306
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307 void
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308 ngx_mail_smtp_init_protocol(ngx_event_t *rev)
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309 {
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310 ngx_connection_t *c;
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311 ngx_mail_session_t *s;
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312
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313 c = rev->data;
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314
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315 c->log->action = "in auth state";
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316
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317 if (rev->timedout) {
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318 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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319 c->timedout = 1;
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320 ngx_mail_close_connection(c);
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321 return;
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322 }
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323
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324 s = c->data;
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325
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326 if (s->buffer == NULL) {
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327 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
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328 return;
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329 }
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330 }
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331
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332 s->mail_state = ngx_smtp_start;
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333 c->read->handler = ngx_mail_smtp_auth_state;
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334
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335 ngx_mail_smtp_auth_state(rev);
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336 }
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337
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338
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339 static ngx_int_t
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340 ngx_mail_smtp_create_buffer(ngx_mail_session_t *s, ngx_connection_t *c)
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341 {
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342 ngx_mail_smtp_srv_conf_t *sscf;
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343
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344 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) == NGX_ERROR) {
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345 ngx_mail_session_internal_server_error(s);
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346 return NGX_ERROR;
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347 }
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348
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349 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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350
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351 s->buffer = ngx_create_temp_buf(c->pool, sscf->client_buffer_size);
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352 if (s->buffer == NULL) {
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353 ngx_mail_session_internal_server_error(s);
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354 return NGX_ERROR;
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355 }
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356
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357 return NGX_OK;
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358 }
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359
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360
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361 void
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362 ngx_mail_smtp_auth_state(ngx_event_t *rev)
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363 {
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364 ngx_int_t rc;
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365 ngx_connection_t *c;
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366 ngx_mail_session_t *s;
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367
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368 c = rev->data;
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369 s = c->data;
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370
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371 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp auth state");
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372
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373 if (rev->timedout) {
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374 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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375 c->timedout = 1;
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376 ngx_mail_close_connection(c);
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377 return;
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378 }
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379
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380 if (s->out.len) {
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381 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp send handler busy");
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382 s->blocked = 1;
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383 return;
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384 }
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385
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386 s->blocked = 0;
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387
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388 rc = ngx_mail_read_command(s, c);
|
|
|
389
|
|
|
390 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
|
|
|
391 return;
|
|
|
392 }
|
|
|
393
|
|
|
394 s->out.len = sizeof(smtp_ok) - 1;
|
|
|
395 s->out.data = smtp_ok;
|
|
|
396
|
|
|
397 if (rc == NGX_OK) {
|
|
|
398 switch (s->mail_state) {
|
|
|
399
|
|
|
400 case ngx_smtp_start:
|
|
|
401
|
|
|
402 switch (s->command) {
|
|
|
403
|
|
|
404 case NGX_SMTP_HELO:
|
|
|
405 case NGX_SMTP_EHLO:
|
|
|
406 rc = ngx_mail_smtp_helo(s, c);
|
|
|
407 break;
|
|
|
408
|
|
|
409 case NGX_SMTP_AUTH:
|
|
|
410 rc = ngx_mail_smtp_auth(s, c);
|
|
|
411 break;
|
|
|
412
|
|
|
413 case NGX_SMTP_QUIT:
|
|
|
414 s->quit = 1;
|
|
|
415 s->out.len = sizeof(smtp_bye) - 1;
|
|
|
416 s->out.data = smtp_bye;
|
|
|
417 break;
|
|
|
418
|
|
|
419 case NGX_SMTP_MAIL:
|
|
|
420 rc = ngx_mail_smtp_mail(s, c);
|
|
|
421 break;
|
|
|
422
|
|
409
|
423 case NGX_SMTP_RCPT:
|
|
|
424 rc = ngx_mail_smtp_rcpt(s, c);
|
|
|
425 break;
|
|
|
426
|
|
|
427 case NGX_SMTP_RSET:
|
|
|
428 rc = ngx_mail_smtp_rset(s, c);
|
|
|
429 break;
|
|
|
430
|
|
336
|
431 case NGX_SMTP_NOOP:
|
|
|
432 break;
|
|
|
433
|
|
|
434 case NGX_SMTP_STARTTLS:
|
|
|
435 rc = ngx_mail_smtp_starttls(s, c);
|
|
358
|
436 s->out.len = sizeof(smtp_starttls) - 1;
|
|
|
437 s->out.data = smtp_starttls;
|
|
336
|
438 break;
|
|
|
439
|
|
|
440 default:
|
|
|
441 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
442 break;
|
|
|
443 }
|
|
|
444
|
|
|
445 break;
|
|
|
446
|
|
|
447 case ngx_smtp_auth_login_username:
|
|
|
448 rc = ngx_mail_auth_login_username(s, c);
|
|
|
449
|
|
|
450 s->out.len = sizeof(smtp_password) - 1;
|
|
|
451 s->out.data = smtp_password;
|
|
|
452 s->mail_state = ngx_smtp_auth_login_password;
|
|
|
453 break;
|
|
|
454
|
|
|
455 case ngx_smtp_auth_login_password:
|
|
|
456 rc = ngx_mail_auth_login_password(s, c);
|
|
|
457 break;
|
|
|
458
|
|
|
459 case ngx_smtp_auth_plain:
|
|
|
460 rc = ngx_mail_auth_plain(s, c, 0);
|
|
|
461 break;
|
|
|
462
|
|
|
463 case ngx_smtp_auth_cram_md5:
|
|
|
464 rc = ngx_mail_auth_cram_md5(s, c);
|
|
|
465 break;
|
|
|
466 }
|
|
|
467 }
|
|
|
468
|
|
|
469 switch (rc) {
|
|
|
470
|
|
|
471 case NGX_DONE:
|
|
|
472 ngx_mail_auth(s, c);
|
|
|
473 return;
|
|
|
474
|
|
|
475 case NGX_ERROR:
|
|
|
476 ngx_mail_session_internal_server_error(s);
|
|
|
477 return;
|
|
|
478
|
|
|
479 case NGX_MAIL_PARSE_INVALID_COMMAND:
|
|
|
480 s->mail_state = ngx_smtp_start;
|
|
|
481 s->state = 0;
|
|
|
482
|
|
|
483 s->out.len = sizeof(smtp_invalid_command) - 1;
|
|
|
484 s->out.data = smtp_invalid_command;
|
|
|
485
|
|
|
486 /* fall through */
|
|
|
487
|
|
|
488 case NGX_OK:
|
|
|
489 s->args.nelts = 0;
|
|
|
490 s->buffer->pos = s->buffer->start;
|
|
|
491 s->buffer->last = s->buffer->start;
|
|
|
492
|
|
|
493 if (s->state) {
|
|
|
494 s->arg_start = s->buffer->start;
|
|
|
495 }
|
|
|
496
|
|
|
497 ngx_mail_send(c->write);
|
|
|
498 }
|
|
|
499 }
|
|
|
500
|
|
|
501
|
|
|
502 static ngx_int_t
|
|
|
503 ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
504 {
|
|
|
505 ngx_str_t *arg;
|
|
|
506 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
507
|
|
|
508 if (s->args.nelts != 1) {
|
|
|
509 s->out.len = sizeof(smtp_invalid_argument) - 1;
|
|
|
510 s->out.data = smtp_invalid_argument;
|
|
|
511 s->state = 0;
|
|
|
512 return NGX_OK;
|
|
|
513 }
|
|
|
514
|
|
|
515 arg = s->args.elts;
|
|
|
516
|
|
|
517 s->smtp_helo.len = arg[0].len;
|
|
|
518
|
|
382
|
519 s->smtp_helo.data = ngx_pnalloc(c->pool, arg[0].len);
|
|
336
|
520 if (s->smtp_helo.data == NULL) {
|
|
|
521 return NGX_ERROR;
|
|
|
522 }
|
|
|
523
|
|
|
524 ngx_memcpy(s->smtp_helo.data, arg[0].data, arg[0].len);
|
|
|
525
|
|
409
|
526 s->smtp_from.len = 0;
|
|
|
527 s->smtp_from.data = NULL;
|
|
|
528 s->smtp_to.len = 0;
|
|
|
529 s->smtp_to.data = NULL;
|
|
|
530
|
|
336
|
531 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
532
|
|
|
533 if (s->command == NGX_SMTP_HELO) {
|
|
|
534 s->out = sscf->server_name;
|
|
|
535
|
|
|
536 } else {
|
|
|
537 s->esmtp = 1;
|
|
|
538
|
|
|
539 #if (NGX_MAIL_SSL)
|
|
|
540
|
|
|
541 if (c->ssl == NULL) {
|
|
356
|
542 ngx_mail_ssl_conf_t *sslcf;
|
|
|
543
|
|
336
|
544 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
545
|
|
|
546 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
|
|
|
547 s->out = sscf->starttls_capability;
|
|
|
548 return NGX_OK;
|
|
|
549 }
|
|
|
550
|
|
|
551 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
|
|
|
552 s->out = sscf->starttls_only_capability;
|
|
|
553 return NGX_OK;
|
|
|
554 }
|
|
|
555 }
|
|
|
556 #endif
|
|
|
557
|
|
|
558 s->out = sscf->capability;
|
|
|
559 }
|
|
|
560
|
|
|
561 return NGX_OK;
|
|
|
562 }
|
|
|
563
|
|
|
564
|
|
|
565 static ngx_int_t
|
|
|
566 ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
567 {
|
|
|
568 ngx_int_t rc;
|
|
|
569 ngx_mail_core_srv_conf_t *cscf;
|
|
|
570 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
571
|
|
|
572 #if (NGX_MAIL_SSL)
|
|
|
573 if (ngx_mail_starttls_only(s, c)) {
|
|
|
574 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
575 }
|
|
|
576 #endif
|
|
|
577
|
|
|
578 if (s->args.nelts == 0) {
|
|
|
579 s->out.len = sizeof(smtp_invalid_argument) - 1;
|
|
|
580 s->out.data = smtp_invalid_argument;
|
|
|
581 s->state = 0;
|
|
|
582 return NGX_OK;
|
|
|
583 }
|
|
|
584
|
|
|
585 rc = ngx_mail_auth_parse(s, c);
|
|
|
586
|
|
|
587 switch (rc) {
|
|
|
588
|
|
|
589 case NGX_MAIL_AUTH_LOGIN:
|
|
|
590
|
|
|
591 s->out.len = sizeof(smtp_username) - 1;
|
|
|
592 s->out.data = smtp_username;
|
|
|
593 s->mail_state = ngx_smtp_auth_login_username;
|
|
|
594
|
|
|
595 return NGX_OK;
|
|
|
596
|
|
|
597 case NGX_MAIL_AUTH_PLAIN:
|
|
|
598
|
|
|
599 s->out.len = sizeof(smtp_next) - 1;
|
|
|
600 s->out.data = smtp_next;
|
|
|
601 s->mail_state = ngx_smtp_auth_plain;
|
|
|
602
|
|
|
603 return NGX_OK;
|
|
|
604
|
|
|
605 case NGX_MAIL_AUTH_CRAM_MD5:
|
|
|
606
|
|
|
607 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
608
|
|
|
609 if (!(sscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
|
|
|
610 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
611 }
|
|
|
612
|
|
|
613 if (s->salt.data == NULL) {
|
|
|
614 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
615
|
|
|
616 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
|
|
|
617 return NGX_ERROR;
|
|
|
618 }
|
|
|
619 }
|
|
|
620
|
|
|
621 if (ngx_mail_auth_cram_md5_salt(s, c, "334 ", 4) == NGX_OK) {
|
|
|
622 s->mail_state = ngx_smtp_auth_cram_md5;
|
|
|
623 return NGX_OK;
|
|
|
624 }
|
|
|
625
|
|
|
626 return NGX_ERROR;
|
|
|
627 }
|
|
|
628
|
|
|
629 return rc;
|
|
|
630 }
|
|
|
631
|
|
|
632
|
|
|
633 static ngx_int_t
|
|
|
634 ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
635 {
|
|
409
|
636 u_char ch;
|
|
|
637 ngx_str_t l;
|
|
|
638 ngx_uint_t i;
|
|
|
639 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
640
|
|
|
641 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
642
|
|
|
643 if (!(sscf->auth_methods & NGX_MAIL_AUTH_NONE_ENABLED)) {
|
|
|
644 ngx_mail_smtp_log_rejected_command(s, c,
|
|
|
645 "client was rejected: \"%V\"");
|
|
|
646
|
|
|
647 s->out.len = sizeof(smtp_auth_required) - 1;
|
|
|
648 s->out.data = smtp_auth_required;
|
|
|
649
|
|
|
650 return NGX_OK;
|
|
|
651 }
|
|
|
652
|
|
|
653 /* auth none */
|
|
|
654
|
|
|
655 if (s->smtp_from.len) {
|
|
|
656 s->out.len = sizeof(smtp_bad_sequence) - 1;
|
|
|
657 s->out.data = smtp_bad_sequence;
|
|
|
658 return NGX_OK;
|
|
|
659 }
|
|
|
660
|
|
|
661 l.len = s->buffer->last - s->buffer->start;
|
|
|
662 l.data = s->buffer->start;
|
|
|
663
|
|
|
664 for (i = 0; i < l.len; i++) {
|
|
|
665 ch = l.data[i];
|
|
|
666
|
|
|
667 if (ch != CR && ch != LF) {
|
|
|
668 continue;
|
|
|
669 }
|
|
|
670
|
|
|
671 l.data[i] = ' ';
|
|
|
672 }
|
|
|
673
|
|
|
674 while (i) {
|
|
|
675 if (l.data[i - 1] != ' ') {
|
|
|
676 break;
|
|
|
677 }
|
|
|
678
|
|
|
679 i--;
|
|
|
680 }
|
|
|
681
|
|
|
682 l.len = i;
|
|
|
683
|
|
|
684 s->smtp_from.len = l.len;
|
|
|
685
|
|
|
686 s->smtp_from.data = ngx_palloc(c->pool, l.len);
|
|
|
687 if (s->smtp_from.data == NULL) {
|
|
|
688 return NGX_ERROR;
|
|
|
689 }
|
|
|
690
|
|
|
691 ngx_memcpy(s->smtp_from.data, l.data, l.len);
|
|
|
692
|
|
|
693 s->out.len = sizeof(smtp_ok) - 1;
|
|
|
694 s->out.data = smtp_ok;
|
|
|
695
|
|
|
696 return NGX_OK;
|
|
|
697 }
|
|
336
|
698
|
|
409
|
699
|
|
|
700 static ngx_int_t
|
|
|
701 ngx_mail_smtp_rcpt(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
702 {
|
|
|
703 u_char ch;
|
|
|
704 ngx_str_t l;
|
|
|
705 ngx_uint_t i;
|
|
|
706
|
|
|
707 if (s->smtp_from.len == 0) {
|
|
|
708 s->out.len = sizeof(smtp_bad_sequence) - 1;
|
|
|
709 s->out.data = smtp_bad_sequence;
|
|
|
710 return NGX_OK;
|
|
|
711 }
|
|
|
712
|
|
|
713 l.len = s->buffer->last - s->buffer->start;
|
|
|
714 l.data = s->buffer->start;
|
|
|
715
|
|
|
716 for (i = 0; i < l.len; i++) {
|
|
|
717 ch = l.data[i];
|
|
|
718
|
|
|
719 if (ch != CR && ch != LF) {
|
|
|
720 continue;
|
|
|
721 }
|
|
|
722
|
|
|
723 l.data[i] = ' ';
|
|
|
724 }
|
|
|
725
|
|
|
726 while (i) {
|
|
|
727 if (l.data[i - 1] != ' ') {
|
|
|
728 break;
|
|
|
729 }
|
|
|
730
|
|
|
731 i--;
|
|
|
732 }
|
|
|
733
|
|
|
734 l.len = i;
|
|
|
735
|
|
|
736 s->smtp_to.len = l.len;
|
|
|
737
|
|
|
738 s->smtp_to.data = ngx_palloc(c->pool, l.len);
|
|
|
739 if (s->smtp_to.data == NULL) {
|
|
|
740 return NGX_ERROR;
|
|
|
741 }
|
|
|
742
|
|
|
743 ngx_memcpy(s->smtp_to.data, l.data, l.len);
|
|
|
744
|
|
|
745 s->auth_method = NGX_MAIL_AUTH_NONE;
|
|
|
746
|
|
|
747 return NGX_DONE;
|
|
|
748 }
|
|
|
749
|
|
|
750
|
|
|
751 static ngx_int_t
|
|
|
752 ngx_mail_smtp_rset(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
753 {
|
|
|
754 s->smtp_from.len = 0;
|
|
|
755 s->smtp_from.data = NULL;
|
|
|
756 s->smtp_to.len = 0;
|
|
|
757 s->smtp_to.data = NULL;
|
|
|
758
|
|
|
759 s->out.len = sizeof(smtp_ok) - 1;
|
|
|
760 s->out.data = smtp_ok;
|
|
336
|
761
|
|
|
762 return NGX_OK;
|
|
|
763 }
|
|
|
764
|
|
|
765
|
|
|
766 static ngx_int_t
|
|
|
767 ngx_mail_smtp_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
768 {
|
|
|
769 #if (NGX_MAIL_SSL)
|
|
|
770 ngx_mail_ssl_conf_t *sslcf;
|
|
|
771
|
|
|
772 if (c->ssl == NULL) {
|
|
|
773 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
774 if (sslcf->starttls) {
|
|
|
775
|
|
|
776 /*
|
|
|
777 * RFC3207 requires us to discard any knowledge
|
|
|
778 * obtained from client before STARTTLS.
|
|
|
779 */
|
|
|
780
|
|
|
781 s->smtp_helo.len = 0;
|
|
|
782 s->smtp_helo.data = NULL;
|
|
409
|
783 s->smtp_from.len = 0;
|
|
|
784 s->smtp_from.data = NULL;
|
|
|
785 s->smtp_to.len = 0;
|
|
|
786 s->smtp_to.data = NULL;
|
|
336
|
787
|
|
|
788 c->read->handler = ngx_mail_starttls_handler;
|
|
|
789 return NGX_OK;
|
|
|
790 }
|
|
|
791 }
|
|
|
792
|
|
|
793 #endif
|
|
|
794
|
|
|
795 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
796 }
|
|
|
797
|
|
|
798
|
|
|
799 static ngx_int_t
|
|
|
800 ngx_mail_smtp_discard_command(ngx_mail_session_t *s, ngx_connection_t *c,
|
|
|
801 char *err)
|
|
|
802 {
|
|
|
803 ssize_t n;
|
|
|
804
|
|
|
805 n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last);
|
|
|
806
|
|
|
807 if (n == NGX_ERROR || n == 0) {
|
|
|
808 ngx_mail_close_connection(c);
|
|
|
809 return NGX_ERROR;
|
|
|
810 }
|
|
|
811
|
|
|
812 if (n > 0) {
|
|
|
813 s->buffer->last += n;
|
|
|
814 }
|
|
|
815
|
|
|
816 if (n == NGX_AGAIN) {
|
|
|
817 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
|
|
|
818 ngx_mail_session_internal_server_error(s);
|
|
|
819 return NGX_ERROR;
|
|
|
820 }
|
|
|
821
|
|
|
822 return NGX_AGAIN;
|
|
|
823 }
|
|
|
824
|
|
|
825 ngx_mail_smtp_log_rejected_command(s, c, err);
|
|
|
826
|
|
|
827 s->buffer->pos = s->buffer->start;
|
|
|
828 s->buffer->last = s->buffer->start;
|
|
|
829
|
|
|
830 return NGX_OK;
|
|
|
831 }
|
|
|
832
|
|
|
833
|
|
|
834 static void
|
|
|
835 ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s, ngx_connection_t *c,
|
|
|
836 char *err)
|
|
|
837 {
|
|
|
838 u_char ch;
|
|
|
839 ngx_str_t cmd;
|
|
|
840 ngx_uint_t i;
|
|
|
841
|
|
|
842 if (c->log->log_level < NGX_LOG_INFO) {
|
|
|
843 return;
|
|
|
844 }
|
|
|
845
|
|
|
846 cmd.len = s->buffer->last - s->buffer->start;
|
|
|
847 cmd.data = s->buffer->start;
|
|
|
848
|
|
|
849 for (i = 0; i < cmd.len; i++) {
|
|
|
850 ch = cmd.data[i];
|
|
|
851
|
|
|
852 if (ch != CR && ch != LF) {
|
|
|
853 continue;
|
|
|
854 }
|
|
|
855
|
|
|
856 cmd.data[i] = '_';
|
|
|
857 }
|
|
|
858
|
|
|
859 cmd.len = i;
|
|
|
860
|
|
|
861 ngx_log_error(NGX_LOG_INFO, c->log, 0, err, &cmd);
|
|
|
862 }
|
