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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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442
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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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420
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27 static ngx_int_t ngx_mail_smtp_rset(ngx_mail_session_t *s, ngx_connection_t *c);
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28 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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29
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30 static ngx_int_t ngx_mail_smtp_discard_command(ngx_mail_session_t *s,
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31 ngx_connection_t *c, char *err);
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32 static void ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s,
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33 ngx_connection_t *c, char *err);
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34
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35
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36 static u_char smtp_ok[] = "250 2.0.0 OK" CRLF;
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37 static u_char smtp_bye[] = "221 2.0.0 Bye" CRLF;
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358
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38 static u_char smtp_starttls[] = "220 2.0.0 Start TLS" CRLF;
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336
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39 static u_char smtp_next[] = "334 " CRLF;
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40 static u_char smtp_username[] = "334 VXNlcm5hbWU6" CRLF;
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41 static u_char smtp_password[] = "334 UGFzc3dvcmQ6" CRLF;
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42 static u_char smtp_invalid_command[] = "500 5.5.1 Invalid command" CRLF;
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43 static u_char smtp_invalid_pipelining[] =
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44 "503 5.5.0 Improper use of SMTP command pipelining" CRLF;
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45 static u_char smtp_invalid_argument[] = "501 5.5.4 Invalid argument" CRLF;
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46 static u_char smtp_auth_required[] = "530 5.7.1 Authentication required" CRLF;
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420
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47 static u_char smtp_bad_sequence[] = "503 5.5.1 Bad sequence of commands" CRLF;
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336
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48
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49
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366
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50 static ngx_str_t smtp_unavailable = ngx_string("[UNAVAILABLE]");
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51 static ngx_str_t smtp_tempunavail = ngx_string("[TEMPUNAVAIL]");
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52
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53
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336
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54 void
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55 ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
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56 {
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366
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57 struct sockaddr_in *sin;
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58 ngx_resolver_ctx_t *ctx;
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59 ngx_mail_core_srv_conf_t *cscf;
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60
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61 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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62
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63 if (cscf->resolver == NULL) {
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64 s->host = smtp_unavailable;
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65 ngx_mail_smtp_greeting(s, c);
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66 return;
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67 }
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68
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69 c->log->action = "in resolving client address";
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70
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71 ctx = ngx_resolve_start(cscf->resolver, NULL);
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72 if (ctx == NULL) {
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73 ngx_mail_close_connection(c);
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74 return;
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75 }
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76
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77 /* AF_INET only */
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78
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79 sin = (struct sockaddr_in *) c->sockaddr;
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80
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81 ctx->addr = sin->sin_addr.s_addr;
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82 ctx->handler = ngx_mail_smtp_resolve_addr_handler;
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83 ctx->data = s;
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84 ctx->timeout = cscf->resolver_timeout;
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85
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86 if (ngx_resolve_addr(ctx) != NGX_OK) {
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87 ngx_mail_close_connection(c);
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88 }
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89 }
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90
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91
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92 static void
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93 ngx_mail_smtp_resolve_addr_handler(ngx_resolver_ctx_t *ctx)
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94 {
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442
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95 ngx_connection_t *c;
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96 ngx_mail_session_t *s;
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366
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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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442
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137 c->read->handler = ngx_mail_smtp_resolve_name;
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138
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139 ngx_post_event(c->read, &ngx_posted_events);
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140 }
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141
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142
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143 static void
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144 ngx_mail_smtp_resolve_name(ngx_event_t *rev)
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145 {
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146 ngx_connection_t *c;
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147 ngx_mail_session_t *s;
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148 ngx_resolver_ctx_t *ctx;
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149 ngx_mail_core_srv_conf_t *cscf;
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150
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151 c = rev->data;
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152 s = c->data;
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153
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366
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154 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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155
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156 ctx = ngx_resolve_start(cscf->resolver, NULL);
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157 if (ctx == NULL) {
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158 ngx_mail_close_connection(c);
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159 return;
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160 }
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161
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162 ctx->name = s->host;
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163 ctx->type = NGX_RESOLVE_A;
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164 ctx->handler = ngx_mail_smtp_resolve_name_handler;
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165 ctx->data = s;
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166 ctx->timeout = cscf->resolver_timeout;
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167
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168 if (ngx_resolve_name(ctx) != NGX_OK) {
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169 ngx_mail_close_connection(c);
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170 }
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171 }
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172
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173
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174 static void
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175 ngx_mail_smtp_resolve_name_handler(ngx_resolver_ctx_t *ctx)
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176 {
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177 in_addr_t addr;
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178 ngx_uint_t i;
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179 ngx_connection_t *c;
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180 struct sockaddr_in *sin;
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181 ngx_mail_session_t *s;
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182
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183 s = ctx->data;
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184 c = s->connection;
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185
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186 if (ctx->state) {
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187 ngx_log_error(NGX_LOG_ERR, c->log, 0,
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188 "%V could not be resolved (%i: %s)",
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189 &ctx->name, ctx->state,
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190 ngx_resolver_strerror(ctx->state));
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191
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192 if (ctx->state == NGX_RESOLVE_NXDOMAIN) {
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193 s->host = smtp_unavailable;
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194
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195 } else {
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196 s->host = smtp_tempunavail;
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197 }
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198
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199 } else {
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200
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201 /* AF_INET only */
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202
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203 sin = (struct sockaddr_in *) c->sockaddr;
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204
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205 for (i = 0; i < ctx->naddrs; i++) {
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206
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207 addr = ctx->addrs[i];
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208
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209 ngx_log_debug4(NGX_LOG_DEBUG_MAIL, c->log, 0,
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210 "name was resolved to %ud.%ud.%ud.%ud",
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211 (ntohl(addr) >> 24) & 0xff,
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212 (ntohl(addr) >> 16) & 0xff,
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213 (ntohl(addr) >> 8) & 0xff,
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214 ntohl(addr) & 0xff);
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215
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216 if (addr == sin->sin_addr.s_addr) {
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217 goto found;
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218 }
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219 }
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220
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221 s->host = smtp_unavailable;
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222 }
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223
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224 found:
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225
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226 ngx_resolve_name_done(ctx);
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227
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228 ngx_mail_smtp_greeting(s, c);
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229 }
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230
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231
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232 static void
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233 ngx_mail_smtp_greeting(ngx_mail_session_t *s, ngx_connection_t *c)
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234 {
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336
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235 ngx_msec_t timeout;
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236 ngx_mail_core_srv_conf_t *cscf;
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237 ngx_mail_smtp_srv_conf_t *sscf;
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238
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366
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239 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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240 "smtp greeting for \"%V\"", &s->host);
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241
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336
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242 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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243 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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244
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245 timeout = sscf->greeting_delay ? sscf->greeting_delay : cscf->timeout;
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246 ngx_add_timer(c->read, timeout);
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247
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430
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248 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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336
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249 ngx_mail_close_connection(c);
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250 }
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251
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252 if (sscf->greeting_delay) {
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253 c->read->handler = ngx_mail_smtp_invalid_pipelining;
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254 return;
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255 }
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256
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257 c->read->handler = ngx_mail_smtp_init_protocol;
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258
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259 s->out = sscf->greeting;
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260
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261 ngx_mail_send(c->write);
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262 }
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263
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264
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265 static void
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266 ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev)
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267 {
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268 ngx_connection_t *c;
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269 ngx_mail_session_t *s;
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270 ngx_mail_core_srv_conf_t *cscf;
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271 ngx_mail_smtp_srv_conf_t *sscf;
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272
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273 c = rev->data;
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274 s = c->data;
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275
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276 c->log->action = "in delay pipelining state";
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277
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278 if (rev->timedout) {
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279
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280 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "delay greeting");
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281
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282 rev->timedout = 0;
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283
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284 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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285
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286 c->read->handler = ngx_mail_smtp_init_protocol;
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287
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288 ngx_add_timer(c->read, cscf->timeout);
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289
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430
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290 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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336
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291 ngx_mail_close_connection(c);
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292 return;
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293 }
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294
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295 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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296
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297 s->out = sscf->greeting;
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298
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299 } else {
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300
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301 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "invalid pipelining");
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302
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303 if (s->buffer == NULL) {
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304 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
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305 return;
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306 }
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307 }
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308
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309 if (ngx_mail_smtp_discard_command(s, c,
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310 "client was rejected before greeting: \"%V\"")
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311 != NGX_OK)
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312 {
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313 return;
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314 }
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315
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316 s->out.len = sizeof(smtp_invalid_pipelining) - 1;
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317 s->out.data = smtp_invalid_pipelining;
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318 }
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319
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320 ngx_mail_send(c->write);
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321 }
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322
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323
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324 void
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325 ngx_mail_smtp_init_protocol(ngx_event_t *rev)
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326 {
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327 ngx_connection_t *c;
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328 ngx_mail_session_t *s;
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329
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330 c = rev->data;
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331
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332 c->log->action = "in auth state";
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333
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334 if (rev->timedout) {
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335 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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336 c->timedout = 1;
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337 ngx_mail_close_connection(c);
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338 return;
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339 }
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340
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341 s = c->data;
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342
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343 if (s->buffer == NULL) {
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344 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
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345 return;
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346 }
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347 }
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348
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349 s->mail_state = ngx_smtp_start;
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350 c->read->handler = ngx_mail_smtp_auth_state;
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351
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352 ngx_mail_smtp_auth_state(rev);
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353 }
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354
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355
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356 static ngx_int_t
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357 ngx_mail_smtp_create_buffer(ngx_mail_session_t *s, ngx_connection_t *c)
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358 {
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359 ngx_mail_smtp_srv_conf_t *sscf;
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360
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361 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) == NGX_ERROR) {
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362 ngx_mail_session_internal_server_error(s);
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363 return NGX_ERROR;
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364 }
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365
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366 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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367
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368 s->buffer = ngx_create_temp_buf(c->pool, sscf->client_buffer_size);
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369 if (s->buffer == NULL) {
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370 ngx_mail_session_internal_server_error(s);
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371 return NGX_ERROR;
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372 }
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373
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374 return NGX_OK;
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375 }
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376
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377
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378 void
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379 ngx_mail_smtp_auth_state(ngx_event_t *rev)
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380 {
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381 ngx_int_t rc;
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382 ngx_connection_t *c;
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383 ngx_mail_session_t *s;
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384
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385 c = rev->data;
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386 s = c->data;
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387
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388 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp auth state");
|
|
|
389
|
|
|
390 if (rev->timedout) {
|
|
|
391 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
|
|
|
392 c->timedout = 1;
|
|
|
393 ngx_mail_close_connection(c);
|
|
|
394 return;
|
|
|
395 }
|
|
|
396
|
|
|
397 if (s->out.len) {
|
|
|
398 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp send handler busy");
|
|
|
399 s->blocked = 1;
|
|
|
400 return;
|
|
|
401 }
|
|
|
402
|
|
|
403 s->blocked = 0;
|
|
|
404
|
|
|
405 rc = ngx_mail_read_command(s, c);
|
|
|
406
|
|
|
407 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
|
|
|
408 return;
|
|
|
409 }
|
|
|
410
|
|
|
411 s->out.len = sizeof(smtp_ok) - 1;
|
|
|
412 s->out.data = smtp_ok;
|
|
|
413
|
|
|
414 if (rc == NGX_OK) {
|
|
|
415 switch (s->mail_state) {
|
|
|
416
|
|
|
417 case ngx_smtp_start:
|
|
|
418
|
|
|
419 switch (s->command) {
|
|
|
420
|
|
|
421 case NGX_SMTP_HELO:
|
|
|
422 case NGX_SMTP_EHLO:
|
|
|
423 rc = ngx_mail_smtp_helo(s, c);
|
|
|
424 break;
|
|
|
425
|
|
|
426 case NGX_SMTP_AUTH:
|
|
|
427 rc = ngx_mail_smtp_auth(s, c);
|
|
|
428 break;
|
|
|
429
|
|
|
430 case NGX_SMTP_QUIT:
|
|
|
431 s->quit = 1;
|
|
|
432 s->out.len = sizeof(smtp_bye) - 1;
|
|
|
433 s->out.data = smtp_bye;
|
|
|
434 break;
|
|
|
435
|
|
|
436 case NGX_SMTP_MAIL:
|
|
|
437 rc = ngx_mail_smtp_mail(s, c);
|
|
|
438 break;
|
|
|
439
|
|
420
|
440 case NGX_SMTP_RCPT:
|
|
|
441 rc = ngx_mail_smtp_rcpt(s, c);
|
|
|
442 break;
|
|
|
443
|
|
|
444 case NGX_SMTP_RSET:
|
|
|
445 rc = ngx_mail_smtp_rset(s, c);
|
|
|
446 break;
|
|
|
447
|
|
336
|
448 case NGX_SMTP_NOOP:
|
|
|
449 break;
|
|
|
450
|
|
|
451 case NGX_SMTP_STARTTLS:
|
|
|
452 rc = ngx_mail_smtp_starttls(s, c);
|
|
358
|
453 s->out.len = sizeof(smtp_starttls) - 1;
|
|
|
454 s->out.data = smtp_starttls;
|
|
336
|
455 break;
|
|
|
456
|
|
|
457 default:
|
|
|
458 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
459 break;
|
|
|
460 }
|
|
|
461
|
|
|
462 break;
|
|
|
463
|
|
|
464 case ngx_smtp_auth_login_username:
|
|
444
|
465 rc = ngx_mail_auth_login_username(s, c, 0);
|
|
336
|
466
|
|
|
467 s->out.len = sizeof(smtp_password) - 1;
|
|
|
468 s->out.data = smtp_password;
|
|
|
469 s->mail_state = ngx_smtp_auth_login_password;
|
|
|
470 break;
|
|
|
471
|
|
|
472 case ngx_smtp_auth_login_password:
|
|
|
473 rc = ngx_mail_auth_login_password(s, c);
|
|
|
474 break;
|
|
|
475
|
|
|
476 case ngx_smtp_auth_plain:
|
|
|
477 rc = ngx_mail_auth_plain(s, c, 0);
|
|
|
478 break;
|
|
|
479
|
|
|
480 case ngx_smtp_auth_cram_md5:
|
|
|
481 rc = ngx_mail_auth_cram_md5(s, c);
|
|
|
482 break;
|
|
|
483 }
|
|
|
484 }
|
|
|
485
|
|
|
486 switch (rc) {
|
|
|
487
|
|
|
488 case NGX_DONE:
|
|
|
489 ngx_mail_auth(s, c);
|
|
|
490 return;
|
|
|
491
|
|
|
492 case NGX_ERROR:
|
|
|
493 ngx_mail_session_internal_server_error(s);
|
|
|
494 return;
|
|
|
495
|
|
|
496 case NGX_MAIL_PARSE_INVALID_COMMAND:
|
|
|
497 s->mail_state = ngx_smtp_start;
|
|
|
498 s->state = 0;
|
|
|
499
|
|
|
500 s->out.len = sizeof(smtp_invalid_command) - 1;
|
|
|
501 s->out.data = smtp_invalid_command;
|
|
|
502
|
|
|
503 /* fall through */
|
|
|
504
|
|
|
505 case NGX_OK:
|
|
|
506 s->args.nelts = 0;
|
|
|
507 s->buffer->pos = s->buffer->start;
|
|
|
508 s->buffer->last = s->buffer->start;
|
|
|
509
|
|
|
510 if (s->state) {
|
|
|
511 s->arg_start = s->buffer->start;
|
|
|
512 }
|
|
|
513
|
|
|
514 ngx_mail_send(c->write);
|
|
|
515 }
|
|
|
516 }
|
|
|
517
|
|
|
518
|
|
|
519 static ngx_int_t
|
|
|
520 ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
521 {
|
|
|
522 ngx_str_t *arg;
|
|
|
523 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
524
|
|
|
525 if (s->args.nelts != 1) {
|
|
|
526 s->out.len = sizeof(smtp_invalid_argument) - 1;
|
|
|
527 s->out.data = smtp_invalid_argument;
|
|
|
528 s->state = 0;
|
|
|
529 return NGX_OK;
|
|
|
530 }
|
|
|
531
|
|
|
532 arg = s->args.elts;
|
|
|
533
|
|
|
534 s->smtp_helo.len = arg[0].len;
|
|
|
535
|
|
382
|
536 s->smtp_helo.data = ngx_pnalloc(c->pool, arg[0].len);
|
|
336
|
537 if (s->smtp_helo.data == NULL) {
|
|
|
538 return NGX_ERROR;
|
|
|
539 }
|
|
|
540
|
|
|
541 ngx_memcpy(s->smtp_helo.data, arg[0].data, arg[0].len);
|
|
|
542
|
|
420
|
543 s->smtp_from.len = 0;
|
|
|
544 s->smtp_from.data = NULL;
|
|
|
545 s->smtp_to.len = 0;
|
|
|
546 s->smtp_to.data = NULL;
|
|
|
547
|
|
336
|
548 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
549
|
|
|
550 if (s->command == NGX_SMTP_HELO) {
|
|
|
551 s->out = sscf->server_name;
|
|
|
552
|
|
|
553 } else {
|
|
|
554 s->esmtp = 1;
|
|
|
555
|
|
|
556 #if (NGX_MAIL_SSL)
|
|
|
557
|
|
|
558 if (c->ssl == NULL) {
|
|
356
|
559 ngx_mail_ssl_conf_t *sslcf;
|
|
|
560
|
|
336
|
561 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
562
|
|
|
563 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
|
|
|
564 s->out = sscf->starttls_capability;
|
|
|
565 return NGX_OK;
|
|
|
566 }
|
|
|
567
|
|
|
568 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
|
|
|
569 s->out = sscf->starttls_only_capability;
|
|
|
570 return NGX_OK;
|
|
|
571 }
|
|
|
572 }
|
|
|
573 #endif
|
|
|
574
|
|
|
575 s->out = sscf->capability;
|
|
|
576 }
|
|
|
577
|
|
|
578 return NGX_OK;
|
|
|
579 }
|
|
|
580
|
|
|
581
|
|
|
582 static ngx_int_t
|
|
|
583 ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
584 {
|
|
|
585 ngx_int_t rc;
|
|
|
586 ngx_mail_core_srv_conf_t *cscf;
|
|
|
587 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
588
|
|
|
589 #if (NGX_MAIL_SSL)
|
|
|
590 if (ngx_mail_starttls_only(s, c)) {
|
|
|
591 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
592 }
|
|
|
593 #endif
|
|
|
594
|
|
|
595 if (s->args.nelts == 0) {
|
|
|
596 s->out.len = sizeof(smtp_invalid_argument) - 1;
|
|
|
597 s->out.data = smtp_invalid_argument;
|
|
|
598 s->state = 0;
|
|
|
599 return NGX_OK;
|
|
|
600 }
|
|
|
601
|
|
|
602 rc = ngx_mail_auth_parse(s, c);
|
|
|
603
|
|
|
604 switch (rc) {
|
|
|
605
|
|
|
606 case NGX_MAIL_AUTH_LOGIN:
|
|
|
607
|
|
|
608 s->out.len = sizeof(smtp_username) - 1;
|
|
|
609 s->out.data = smtp_username;
|
|
|
610 s->mail_state = ngx_smtp_auth_login_username;
|
|
|
611
|
|
|
612 return NGX_OK;
|
|
|
613
|
|
444
|
614 case NGX_MAIL_AUTH_LOGIN_USERNAME:
|
|
|
615
|
|
|
616 s->out.len = sizeof(smtp_password) - 1;
|
|
|
617 s->out.data = smtp_password;
|
|
|
618 s->mail_state = ngx_smtp_auth_login_password;
|
|
|
619
|
|
|
620 return ngx_mail_auth_login_username(s, c, 1);
|
|
|
621
|
|
336
|
622 case NGX_MAIL_AUTH_PLAIN:
|
|
|
623
|
|
|
624 s->out.len = sizeof(smtp_next) - 1;
|
|
|
625 s->out.data = smtp_next;
|
|
|
626 s->mail_state = ngx_smtp_auth_plain;
|
|
|
627
|
|
|
628 return NGX_OK;
|
|
|
629
|
|
|
630 case NGX_MAIL_AUTH_CRAM_MD5:
|
|
|
631
|
|
|
632 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
633
|
|
|
634 if (!(sscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
|
|
|
635 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
636 }
|
|
|
637
|
|
|
638 if (s->salt.data == NULL) {
|
|
|
639 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
640
|
|
|
641 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
|
|
|
642 return NGX_ERROR;
|
|
|
643 }
|
|
|
644 }
|
|
|
645
|
|
|
646 if (ngx_mail_auth_cram_md5_salt(s, c, "334 ", 4) == NGX_OK) {
|
|
|
647 s->mail_state = ngx_smtp_auth_cram_md5;
|
|
|
648 return NGX_OK;
|
|
|
649 }
|
|
|
650
|
|
|
651 return NGX_ERROR;
|
|
|
652 }
|
|
|
653
|
|
|
654 return rc;
|
|
|
655 }
|
|
|
656
|
|
|
657
|
|
|
658 static ngx_int_t
|
|
|
659 ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
660 {
|
|
420
|
661 u_char ch;
|
|
|
662 ngx_str_t l;
|
|
|
663 ngx_uint_t i;
|
|
|
664 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
665
|
|
|
666 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
667
|
|
|
668 if (!(sscf->auth_methods & NGX_MAIL_AUTH_NONE_ENABLED)) {
|
|
|
669 ngx_mail_smtp_log_rejected_command(s, c, "client was rejected: \"%V\"");
|
|
|
670
|
|
|
671 s->out.len = sizeof(smtp_auth_required) - 1;
|
|
|
672 s->out.data = smtp_auth_required;
|
|
|
673
|
|
|
674 return NGX_OK;
|
|
|
675 }
|
|
|
676
|
|
|
677 /* auth none */
|
|
|
678
|
|
|
679 if (s->smtp_from.len) {
|
|
|
680 s->out.len = sizeof(smtp_bad_sequence) - 1;
|
|
|
681 s->out.data = smtp_bad_sequence;
|
|
|
682 return NGX_OK;
|
|
|
683 }
|
|
|
684
|
|
|
685 l.len = s->buffer->last - s->buffer->start;
|
|
|
686 l.data = s->buffer->start;
|
|
|
687
|
|
|
688 for (i = 0; i < l.len; i++) {
|
|
|
689 ch = l.data[i];
|
|
|
690
|
|
|
691 if (ch != CR && ch != LF) {
|
|
|
692 continue;
|
|
|
693 }
|
|
|
694
|
|
|
695 l.data[i] = ' ';
|
|
|
696 }
|
|
|
697
|
|
|
698 while (i) {
|
|
|
699 if (l.data[i - 1] != ' ') {
|
|
|
700 break;
|
|
|
701 }
|
|
|
702
|
|
|
703 i--;
|
|
|
704 }
|
|
|
705
|
|
|
706 l.len = i;
|
|
|
707
|
|
|
708 s->smtp_from.len = l.len;
|
|
|
709
|
|
|
710 s->smtp_from.data = ngx_pnalloc(c->pool, l.len);
|
|
|
711 if (s->smtp_from.data == NULL) {
|
|
|
712 return NGX_ERROR;
|
|
|
713 }
|
|
|
714
|
|
|
715 ngx_memcpy(s->smtp_from.data, l.data, l.len);
|
|
|
716
|
|
|
717 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
|
718 "smtp mail from:\"%V\"", &s->smtp_from);
|
|
|
719
|
|
|
720 s->out.len = sizeof(smtp_ok) - 1;
|
|
|
721 s->out.data = smtp_ok;
|
|
|
722
|
|
|
723 return NGX_OK;
|
|
|
724 }
|
|
336
|
725
|
|
420
|
726
|
|
|
727 static ngx_int_t
|
|
|
728 ngx_mail_smtp_rcpt(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
729 {
|
|
|
730 u_char ch;
|
|
|
731 ngx_str_t l;
|
|
|
732 ngx_uint_t i;
|
|
|
733
|
|
|
734 if (s->smtp_from.len == 0) {
|
|
|
735 s->out.len = sizeof(smtp_bad_sequence) - 1;
|
|
|
736 s->out.data = smtp_bad_sequence;
|
|
|
737 return NGX_OK;
|
|
|
738 }
|
|
|
739
|
|
|
740 l.len = s->buffer->last - s->buffer->start;
|
|
|
741 l.data = s->buffer->start;
|
|
|
742
|
|
|
743 for (i = 0; i < l.len; i++) {
|
|
|
744 ch = l.data[i];
|
|
|
745
|
|
|
746 if (ch != CR && ch != LF) {
|
|
|
747 continue;
|
|
|
748 }
|
|
|
749
|
|
|
750 l.data[i] = ' ';
|
|
|
751 }
|
|
|
752
|
|
|
753 while (i) {
|
|
|
754 if (l.data[i - 1] != ' ') {
|
|
|
755 break;
|
|
|
756 }
|
|
|
757
|
|
|
758 i--;
|
|
|
759 }
|
|
|
760
|
|
|
761 l.len = i;
|
|
|
762
|
|
|
763 s->smtp_to.len = l.len;
|
|
|
764
|
|
|
765 s->smtp_to.data = ngx_pnalloc(c->pool, l.len);
|
|
|
766 if (s->smtp_to.data == NULL) {
|
|
|
767 return NGX_ERROR;
|
|
|
768 }
|
|
|
769
|
|
|
770 ngx_memcpy(s->smtp_to.data, l.data, l.len);
|
|
|
771
|
|
|
772 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
|
773 "smtp rcpt to:\"%V\"", &s->smtp_to);
|
|
|
774
|
|
|
775 s->auth_method = NGX_MAIL_AUTH_NONE;
|
|
|
776
|
|
|
777 return NGX_DONE;
|
|
|
778 }
|
|
|
779
|
|
|
780
|
|
|
781 static ngx_int_t
|
|
|
782 ngx_mail_smtp_rset(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
783 {
|
|
|
784 s->smtp_from.len = 0;
|
|
|
785 s->smtp_from.data = NULL;
|
|
|
786 s->smtp_to.len = 0;
|
|
|
787 s->smtp_to.data = NULL;
|
|
|
788
|
|
|
789 s->out.len = sizeof(smtp_ok) - 1;
|
|
|
790 s->out.data = smtp_ok;
|
|
336
|
791
|
|
|
792 return NGX_OK;
|
|
|
793 }
|
|
|
794
|
|
|
795
|
|
|
796 static ngx_int_t
|
|
|
797 ngx_mail_smtp_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
798 {
|
|
|
799 #if (NGX_MAIL_SSL)
|
|
|
800 ngx_mail_ssl_conf_t *sslcf;
|
|
|
801
|
|
|
802 if (c->ssl == NULL) {
|
|
|
803 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
804 if (sslcf->starttls) {
|
|
|
805
|
|
|
806 /*
|
|
|
807 * RFC3207 requires us to discard any knowledge
|
|
|
808 * obtained from client before STARTTLS.
|
|
|
809 */
|
|
|
810
|
|
|
811 s->smtp_helo.len = 0;
|
|
|
812 s->smtp_helo.data = NULL;
|
|
420
|
813 s->smtp_from.len = 0;
|
|
|
814 s->smtp_from.data = NULL;
|
|
|
815 s->smtp_to.len = 0;
|
|
|
816 s->smtp_to.data = NULL;
|
|
336
|
817
|
|
|
818 c->read->handler = ngx_mail_starttls_handler;
|
|
|
819 return NGX_OK;
|
|
|
820 }
|
|
|
821 }
|
|
|
822
|
|
|
823 #endif
|
|
|
824
|
|
|
825 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
826 }
|
|
|
827
|
|
|
828
|
|
|
829 static ngx_int_t
|
|
|
830 ngx_mail_smtp_discard_command(ngx_mail_session_t *s, ngx_connection_t *c,
|
|
|
831 char *err)
|
|
|
832 {
|
|
|
833 ssize_t n;
|
|
|
834
|
|
|
835 n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last);
|
|
|
836
|
|
|
837 if (n == NGX_ERROR || n == 0) {
|
|
|
838 ngx_mail_close_connection(c);
|
|
|
839 return NGX_ERROR;
|
|
|
840 }
|
|
|
841
|
|
|
842 if (n > 0) {
|
|
|
843 s->buffer->last += n;
|
|
|
844 }
|
|
|
845
|
|
|
846 if (n == NGX_AGAIN) {
|
|
430
|
847 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
|
|
336
|
848 ngx_mail_session_internal_server_error(s);
|
|
|
849 return NGX_ERROR;
|
|
|
850 }
|
|
|
851
|
|
|
852 return NGX_AGAIN;
|
|
|
853 }
|
|
|
854
|
|
|
855 ngx_mail_smtp_log_rejected_command(s, c, err);
|
|
|
856
|
|
|
857 s->buffer->pos = s->buffer->start;
|
|
|
858 s->buffer->last = s->buffer->start;
|
|
|
859
|
|
|
860 return NGX_OK;
|
|
|
861 }
|
|
|
862
|
|
|
863
|
|
|
864 static void
|
|
|
865 ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s, ngx_connection_t *c,
|
|
|
866 char *err)
|
|
|
867 {
|
|
|
868 u_char ch;
|
|
|
869 ngx_str_t cmd;
|
|
|
870 ngx_uint_t i;
|
|
|
871
|
|
|
872 if (c->log->log_level < NGX_LOG_INFO) {
|
|
|
873 return;
|
|
|
874 }
|
|
|
875
|
|
|
876 cmd.len = s->buffer->last - s->buffer->start;
|
|
|
877 cmd.data = s->buffer->start;
|
|
|
878
|
|
|
879 for (i = 0; i < cmd.len; i++) {
|
|
|
880 ch = cmd.data[i];
|
|
|
881
|
|
|
882 if (ch != CR && ch != LF) {
|
|
|
883 continue;
|
|
|
884 }
|
|
|
885
|
|
|
886 cmd.data[i] = '_';
|
|
|
887 }
|
|
|
888
|
|
|
889 cmd.len = i;
|
|
|
890
|
|
|
891 ngx_log_error(NGX_LOG_INFO, c->log, 0, err, &cmd);
|
|
|
892 }
|
