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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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660
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4 * Copyright (C) Nginx, Inc.
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336
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11 #include <ngx_mail.h>
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12 #include <ngx_mail_smtp_module.h>
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13
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14
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366
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15 static void ngx_mail_smtp_resolve_addr_handler(ngx_resolver_ctx_t *ctx);
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442
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16 static void ngx_mail_smtp_resolve_name(ngx_event_t *rev);
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366
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17 static void ngx_mail_smtp_resolve_name_handler(ngx_resolver_ctx_t *ctx);
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18 static void ngx_mail_smtp_greeting(ngx_mail_session_t *s, ngx_connection_t *c);
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336
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19 static void ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev);
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20 static ngx_int_t ngx_mail_smtp_create_buffer(ngx_mail_session_t *s,
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21 ngx_connection_t *c);
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22
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23 static ngx_int_t ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c);
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24 static ngx_int_t ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c);
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25 static ngx_int_t ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c);
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26 static ngx_int_t ngx_mail_smtp_starttls(ngx_mail_session_t *s,
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27 ngx_connection_t *c);
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420
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28 static ngx_int_t ngx_mail_smtp_rset(ngx_mail_session_t *s, ngx_connection_t *c);
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29 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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30
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31 static ngx_int_t ngx_mail_smtp_discard_command(ngx_mail_session_t *s,
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32 ngx_connection_t *c, char *err);
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33 static void ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s,
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34 ngx_connection_t *c, char *err);
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35
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36
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37 static u_char smtp_ok[] = "250 2.0.0 OK" CRLF;
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38 static u_char smtp_bye[] = "221 2.0.0 Bye" CRLF;
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358
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39 static u_char smtp_starttls[] = "220 2.0.0 Start TLS" CRLF;
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336
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40 static u_char smtp_next[] = "334 " CRLF;
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41 static u_char smtp_username[] = "334 VXNlcm5hbWU6" CRLF;
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42 static u_char smtp_password[] = "334 UGFzc3dvcmQ6" CRLF;
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43 static u_char smtp_invalid_command[] = "500 5.5.1 Invalid command" CRLF;
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44 static u_char smtp_invalid_pipelining[] =
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45 "503 5.5.0 Improper use of SMTP command pipelining" CRLF;
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46 static u_char smtp_invalid_argument[] = "501 5.5.4 Invalid argument" CRLF;
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47 static u_char smtp_auth_required[] = "530 5.7.1 Authentication required" CRLF;
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420
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48 static u_char smtp_bad_sequence[] = "503 5.5.1 Bad sequence of commands" CRLF;
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336
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49
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50
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366
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51 static ngx_str_t smtp_unavailable = ngx_string("[UNAVAILABLE]");
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52 static ngx_str_t smtp_tempunavail = ngx_string("[TEMPUNAVAIL]");
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53
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54
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336
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55 void
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56 ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
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57 {
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366
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58 struct sockaddr_in *sin;
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59 ngx_resolver_ctx_t *ctx;
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60 ngx_mail_core_srv_conf_t *cscf;
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61
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62 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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63
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64 if (cscf->resolver == NULL) {
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65 s->host = smtp_unavailable;
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66 ngx_mail_smtp_greeting(s, c);
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67 return;
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68 }
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69
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492
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70 if (c->sockaddr->sa_family != AF_INET) {
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71 s->host = smtp_tempunavail;
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72 ngx_mail_smtp_greeting(s, c);
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73 return;
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74 }
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75
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366
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76 c->log->action = "in resolving client address";
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77
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78 ctx = ngx_resolve_start(cscf->resolver, NULL);
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79 if (ctx == NULL) {
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80 ngx_mail_close_connection(c);
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81 return;
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82 }
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83
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84 /* AF_INET only */
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85
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86 sin = (struct sockaddr_in *) c->sockaddr;
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87
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88 ctx->addr = sin->sin_addr.s_addr;
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89 ctx->handler = ngx_mail_smtp_resolve_addr_handler;
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90 ctx->data = s;
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91 ctx->timeout = cscf->resolver_timeout;
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92
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93 if (ngx_resolve_addr(ctx) != NGX_OK) {
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94 ngx_mail_close_connection(c);
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95 }
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96 }
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97
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98
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99 static void
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100 ngx_mail_smtp_resolve_addr_handler(ngx_resolver_ctx_t *ctx)
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101 {
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442
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102 ngx_connection_t *c;
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103 ngx_mail_session_t *s;
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366
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104
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105 s = ctx->data;
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106 c = s->connection;
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107
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108 if (ctx->state) {
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109 ngx_log_error(NGX_LOG_ERR, c->log, 0,
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110 "%V could not be resolved (%i: %s)",
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111 &c->addr_text, ctx->state,
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112 ngx_resolver_strerror(ctx->state));
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113
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114 if (ctx->state == NGX_RESOLVE_NXDOMAIN) {
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115 s->host = smtp_unavailable;
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116
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117 } else {
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118 s->host = smtp_tempunavail;
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119 }
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120
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121 ngx_resolve_addr_done(ctx);
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122
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123 ngx_mail_smtp_greeting(s, s->connection);
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124
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125 return;
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126 }
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127
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128 c->log->action = "in resolving client hostname";
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129
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130 s->host.data = ngx_pstrdup(c->pool, &ctx->name);
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131 if (s->host.data == NULL) {
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132 ngx_resolve_addr_done(ctx);
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133 ngx_mail_close_connection(c);
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134 return;
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135 }
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136
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137 s->host.len = ctx->name.len;
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138
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139 ngx_resolve_addr_done(ctx);
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140
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141 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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142 "address resolved: %V", &s->host);
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143
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442
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144 c->read->handler = ngx_mail_smtp_resolve_name;
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145
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146 ngx_post_event(c->read, &ngx_posted_events);
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147 }
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148
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149
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150 static void
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151 ngx_mail_smtp_resolve_name(ngx_event_t *rev)
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152 {
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153 ngx_connection_t *c;
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154 ngx_mail_session_t *s;
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155 ngx_resolver_ctx_t *ctx;
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156 ngx_mail_core_srv_conf_t *cscf;
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157
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158 c = rev->data;
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159 s = c->data;
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160
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366
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161 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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162
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163 ctx = ngx_resolve_start(cscf->resolver, NULL);
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164 if (ctx == NULL) {
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165 ngx_mail_close_connection(c);
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166 return;
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167 }
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168
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169 ctx->name = s->host;
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170 ctx->type = NGX_RESOLVE_A;
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171 ctx->handler = ngx_mail_smtp_resolve_name_handler;
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172 ctx->data = s;
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173 ctx->timeout = cscf->resolver_timeout;
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174
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175 if (ngx_resolve_name(ctx) != NGX_OK) {
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176 ngx_mail_close_connection(c);
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177 }
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178 }
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179
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180
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181 static void
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182 ngx_mail_smtp_resolve_name_handler(ngx_resolver_ctx_t *ctx)
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183 {
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184 in_addr_t addr;
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185 ngx_uint_t i;
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186 ngx_connection_t *c;
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187 struct sockaddr_in *sin;
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188 ngx_mail_session_t *s;
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189
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190 s = ctx->data;
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191 c = s->connection;
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192
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193 if (ctx->state) {
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194 ngx_log_error(NGX_LOG_ERR, c->log, 0,
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542
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195 "\"%V\" could not be resolved (%i: %s)",
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366
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196 &ctx->name, ctx->state,
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197 ngx_resolver_strerror(ctx->state));
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198
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199 if (ctx->state == NGX_RESOLVE_NXDOMAIN) {
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200 s->host = smtp_unavailable;
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201
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202 } else {
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203 s->host = smtp_tempunavail;
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204 }
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205
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206 } else {
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207
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208 /* AF_INET only */
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209
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210 sin = (struct sockaddr_in *) c->sockaddr;
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211
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212 for (i = 0; i < ctx->naddrs; i++) {
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213
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214 addr = ctx->addrs[i];
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215
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216 ngx_log_debug4(NGX_LOG_DEBUG_MAIL, c->log, 0,
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217 "name was resolved to %ud.%ud.%ud.%ud",
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218 (ntohl(addr) >> 24) & 0xff,
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219 (ntohl(addr) >> 16) & 0xff,
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220 (ntohl(addr) >> 8) & 0xff,
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221 ntohl(addr) & 0xff);
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222
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223 if (addr == sin->sin_addr.s_addr) {
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224 goto found;
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225 }
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226 }
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227
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228 s->host = smtp_unavailable;
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229 }
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230
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231 found:
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232
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233 ngx_resolve_name_done(ctx);
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234
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235 ngx_mail_smtp_greeting(s, c);
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236 }
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237
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238
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239 static void
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240 ngx_mail_smtp_greeting(ngx_mail_session_t *s, ngx_connection_t *c)
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241 {
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336
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242 ngx_msec_t timeout;
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243 ngx_mail_core_srv_conf_t *cscf;
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244 ngx_mail_smtp_srv_conf_t *sscf;
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245
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366
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246 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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247 "smtp greeting for \"%V\"", &s->host);
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248
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336
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249 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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250 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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251
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252 timeout = sscf->greeting_delay ? sscf->greeting_delay : cscf->timeout;
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253 ngx_add_timer(c->read, timeout);
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254
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430
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255 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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336
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256 ngx_mail_close_connection(c);
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257 }
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258
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259 if (sscf->greeting_delay) {
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260 c->read->handler = ngx_mail_smtp_invalid_pipelining;
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261 return;
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262 }
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263
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264 c->read->handler = ngx_mail_smtp_init_protocol;
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265
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266 s->out = sscf->greeting;
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267
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268 ngx_mail_send(c->write);
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269 }
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270
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271
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272 static void
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273 ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev)
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274 {
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275 ngx_connection_t *c;
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276 ngx_mail_session_t *s;
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277 ngx_mail_core_srv_conf_t *cscf;
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278 ngx_mail_smtp_srv_conf_t *sscf;
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279
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280 c = rev->data;
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281 s = c->data;
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282
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283 c->log->action = "in delay pipelining state";
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284
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285 if (rev->timedout) {
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286
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287 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "delay greeting");
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288
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289 rev->timedout = 0;
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290
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291 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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292
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293 c->read->handler = ngx_mail_smtp_init_protocol;
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294
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295 ngx_add_timer(c->read, cscf->timeout);
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296
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430
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297 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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336
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298 ngx_mail_close_connection(c);
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299 return;
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300 }
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301
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302 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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303
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304 s->out = sscf->greeting;
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305
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306 } else {
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307
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308 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "invalid pipelining");
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309
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310 if (s->buffer == NULL) {
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311 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
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312 return;
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313 }
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314 }
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315
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316 if (ngx_mail_smtp_discard_command(s, c,
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317 "client was rejected before greeting: \"%V\"")
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318 != NGX_OK)
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319 {
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320 return;
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321 }
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322
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570
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323 ngx_str_set(&s->out, smtp_invalid_pipelining);
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336
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324 }
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325
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326 ngx_mail_send(c->write);
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327 }
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328
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329
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330 void
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331 ngx_mail_smtp_init_protocol(ngx_event_t *rev)
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332 {
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333 ngx_connection_t *c;
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334 ngx_mail_session_t *s;
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335
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336 c = rev->data;
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337
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338 c->log->action = "in auth state";
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339
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340 if (rev->timedout) {
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341 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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342 c->timedout = 1;
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343 ngx_mail_close_connection(c);
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344 return;
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345 }
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346
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347 s = c->data;
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348
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349 if (s->buffer == NULL) {
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350 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
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351 return;
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352 }
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353 }
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354
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355 s->mail_state = ngx_smtp_start;
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356 c->read->handler = ngx_mail_smtp_auth_state;
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357
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358 ngx_mail_smtp_auth_state(rev);
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359 }
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360
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361
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362 static ngx_int_t
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363 ngx_mail_smtp_create_buffer(ngx_mail_session_t *s, ngx_connection_t *c)
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364 {
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365 ngx_mail_smtp_srv_conf_t *sscf;
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366
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367 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) == NGX_ERROR) {
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368 ngx_mail_session_internal_server_error(s);
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369 return NGX_ERROR;
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370 }
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371
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372 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
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373
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374 s->buffer = ngx_create_temp_buf(c->pool, sscf->client_buffer_size);
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375 if (s->buffer == NULL) {
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376 ngx_mail_session_internal_server_error(s);
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377 return NGX_ERROR;
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378 }
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379
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380 return NGX_OK;
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381 }
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382
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383
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384 void
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385 ngx_mail_smtp_auth_state(ngx_event_t *rev)
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|
386 {
|
|
|
387 ngx_int_t rc;
|
|
|
388 ngx_connection_t *c;
|
|
|
389 ngx_mail_session_t *s;
|
|
|
390
|
|
|
391 c = rev->data;
|
|
|
392 s = c->data;
|
|
|
393
|
|
|
394 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp auth state");
|
|
|
395
|
|
|
396 if (rev->timedout) {
|
|
|
397 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
|
|
|
398 c->timedout = 1;
|
|
|
399 ngx_mail_close_connection(c);
|
|
|
400 return;
|
|
|
401 }
|
|
|
402
|
|
|
403 if (s->out.len) {
|
|
|
404 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp send handler busy");
|
|
|
405 s->blocked = 1;
|
|
|
406 return;
|
|
|
407 }
|
|
|
408
|
|
|
409 s->blocked = 0;
|
|
|
410
|
|
|
411 rc = ngx_mail_read_command(s, c);
|
|
|
412
|
|
|
413 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
|
|
|
414 return;
|
|
|
415 }
|
|
|
416
|
|
570
|
417 ngx_str_set(&s->out, smtp_ok);
|
|
336
|
418
|
|
|
419 if (rc == NGX_OK) {
|
|
|
420 switch (s->mail_state) {
|
|
|
421
|
|
|
422 case ngx_smtp_start:
|
|
|
423
|
|
|
424 switch (s->command) {
|
|
|
425
|
|
|
426 case NGX_SMTP_HELO:
|
|
|
427 case NGX_SMTP_EHLO:
|
|
|
428 rc = ngx_mail_smtp_helo(s, c);
|
|
|
429 break;
|
|
|
430
|
|
|
431 case NGX_SMTP_AUTH:
|
|
|
432 rc = ngx_mail_smtp_auth(s, c);
|
|
|
433 break;
|
|
|
434
|
|
|
435 case NGX_SMTP_QUIT:
|
|
|
436 s->quit = 1;
|
|
570
|
437 ngx_str_set(&s->out, smtp_bye);
|
|
336
|
438 break;
|
|
|
439
|
|
|
440 case NGX_SMTP_MAIL:
|
|
|
441 rc = ngx_mail_smtp_mail(s, c);
|
|
|
442 break;
|
|
|
443
|
|
420
|
444 case NGX_SMTP_RCPT:
|
|
|
445 rc = ngx_mail_smtp_rcpt(s, c);
|
|
|
446 break;
|
|
|
447
|
|
|
448 case NGX_SMTP_RSET:
|
|
|
449 rc = ngx_mail_smtp_rset(s, c);
|
|
|
450 break;
|
|
|
451
|
|
336
|
452 case NGX_SMTP_NOOP:
|
|
|
453 break;
|
|
|
454
|
|
|
455 case NGX_SMTP_STARTTLS:
|
|
|
456 rc = ngx_mail_smtp_starttls(s, c);
|
|
570
|
457 ngx_str_set(&s->out, smtp_starttls);
|
|
336
|
458 break;
|
|
|
459
|
|
|
460 default:
|
|
|
461 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
462 break;
|
|
|
463 }
|
|
|
464
|
|
|
465 break;
|
|
|
466
|
|
|
467 case ngx_smtp_auth_login_username:
|
|
444
|
468 rc = ngx_mail_auth_login_username(s, c, 0);
|
|
336
|
469
|
|
570
|
470 ngx_str_set(&s->out, smtp_password);
|
|
336
|
471 s->mail_state = ngx_smtp_auth_login_password;
|
|
|
472 break;
|
|
|
473
|
|
|
474 case ngx_smtp_auth_login_password:
|
|
|
475 rc = ngx_mail_auth_login_password(s, c);
|
|
|
476 break;
|
|
|
477
|
|
|
478 case ngx_smtp_auth_plain:
|
|
|
479 rc = ngx_mail_auth_plain(s, c, 0);
|
|
|
480 break;
|
|
|
481
|
|
|
482 case ngx_smtp_auth_cram_md5:
|
|
|
483 rc = ngx_mail_auth_cram_md5(s, c);
|
|
|
484 break;
|
|
|
485 }
|
|
|
486 }
|
|
|
487
|
|
|
488 switch (rc) {
|
|
|
489
|
|
|
490 case NGX_DONE:
|
|
|
491 ngx_mail_auth(s, c);
|
|
|
492 return;
|
|
|
493
|
|
|
494 case NGX_ERROR:
|
|
|
495 ngx_mail_session_internal_server_error(s);
|
|
|
496 return;
|
|
|
497
|
|
|
498 case NGX_MAIL_PARSE_INVALID_COMMAND:
|
|
|
499 s->mail_state = ngx_smtp_start;
|
|
|
500 s->state = 0;
|
|
570
|
501 ngx_str_set(&s->out, smtp_invalid_command);
|
|
336
|
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) {
|
|
570
|
526 ngx_str_set(&s->out, smtp_invalid_argument);
|
|
336
|
527 s->state = 0;
|
|
|
528 return NGX_OK;
|
|
|
529 }
|
|
|
530
|
|
|
531 arg = s->args.elts;
|
|
|
532
|
|
|
533 s->smtp_helo.len = arg[0].len;
|
|
|
534
|
|
382
|
535 s->smtp_helo.data = ngx_pnalloc(c->pool, arg[0].len);
|
|
336
|
536 if (s->smtp_helo.data == NULL) {
|
|
|
537 return NGX_ERROR;
|
|
|
538 }
|
|
|
539
|
|
|
540 ngx_memcpy(s->smtp_helo.data, arg[0].data, arg[0].len);
|
|
|
541
|
|
570
|
542 ngx_str_null(&s->smtp_from);
|
|
|
543 ngx_str_null(&s->smtp_to);
|
|
420
|
544
|
|
336
|
545 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
546
|
|
|
547 if (s->command == NGX_SMTP_HELO) {
|
|
|
548 s->out = sscf->server_name;
|
|
|
549
|
|
|
550 } else {
|
|
|
551 s->esmtp = 1;
|
|
|
552
|
|
|
553 #if (NGX_MAIL_SSL)
|
|
|
554
|
|
|
555 if (c->ssl == NULL) {
|
|
356
|
556 ngx_mail_ssl_conf_t *sslcf;
|
|
|
557
|
|
336
|
558 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
559
|
|
|
560 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
|
|
|
561 s->out = sscf->starttls_capability;
|
|
|
562 return NGX_OK;
|
|
|
563 }
|
|
|
564
|
|
|
565 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
|
|
|
566 s->out = sscf->starttls_only_capability;
|
|
|
567 return NGX_OK;
|
|
|
568 }
|
|
|
569 }
|
|
|
570 #endif
|
|
|
571
|
|
|
572 s->out = sscf->capability;
|
|
|
573 }
|
|
|
574
|
|
|
575 return NGX_OK;
|
|
|
576 }
|
|
|
577
|
|
|
578
|
|
|
579 static ngx_int_t
|
|
|
580 ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
581 {
|
|
|
582 ngx_int_t rc;
|
|
|
583 ngx_mail_core_srv_conf_t *cscf;
|
|
|
584 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
585
|
|
|
586 #if (NGX_MAIL_SSL)
|
|
|
587 if (ngx_mail_starttls_only(s, c)) {
|
|
|
588 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
589 }
|
|
|
590 #endif
|
|
|
591
|
|
|
592 if (s->args.nelts == 0) {
|
|
570
|
593 ngx_str_set(&s->out, smtp_invalid_argument);
|
|
336
|
594 s->state = 0;
|
|
|
595 return NGX_OK;
|
|
|
596 }
|
|
|
597
|
|
|
598 rc = ngx_mail_auth_parse(s, c);
|
|
|
599
|
|
|
600 switch (rc) {
|
|
|
601
|
|
|
602 case NGX_MAIL_AUTH_LOGIN:
|
|
|
603
|
|
570
|
604 ngx_str_set(&s->out, smtp_username);
|
|
336
|
605 s->mail_state = ngx_smtp_auth_login_username;
|
|
|
606
|
|
|
607 return NGX_OK;
|
|
|
608
|
|
444
|
609 case NGX_MAIL_AUTH_LOGIN_USERNAME:
|
|
|
610
|
|
570
|
611 ngx_str_set(&s->out, smtp_password);
|
|
444
|
612 s->mail_state = ngx_smtp_auth_login_password;
|
|
|
613
|
|
|
614 return ngx_mail_auth_login_username(s, c, 1);
|
|
|
615
|
|
336
|
616 case NGX_MAIL_AUTH_PLAIN:
|
|
|
617
|
|
570
|
618 ngx_str_set(&s->out, smtp_next);
|
|
336
|
619 s->mail_state = ngx_smtp_auth_plain;
|
|
|
620
|
|
|
621 return NGX_OK;
|
|
|
622
|
|
|
623 case NGX_MAIL_AUTH_CRAM_MD5:
|
|
|
624
|
|
|
625 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
626
|
|
|
627 if (!(sscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
|
|
|
628 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
629 }
|
|
|
630
|
|
|
631 if (s->salt.data == NULL) {
|
|
|
632 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
633
|
|
|
634 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
|
|
|
635 return NGX_ERROR;
|
|
|
636 }
|
|
|
637 }
|
|
|
638
|
|
|
639 if (ngx_mail_auth_cram_md5_salt(s, c, "334 ", 4) == NGX_OK) {
|
|
|
640 s->mail_state = ngx_smtp_auth_cram_md5;
|
|
|
641 return NGX_OK;
|
|
|
642 }
|
|
|
643
|
|
|
644 return NGX_ERROR;
|
|
|
645 }
|
|
|
646
|
|
|
647 return rc;
|
|
|
648 }
|
|
|
649
|
|
|
650
|
|
|
651 static ngx_int_t
|
|
|
652 ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
653 {
|
|
420
|
654 u_char ch;
|
|
|
655 ngx_str_t l;
|
|
|
656 ngx_uint_t i;
|
|
|
657 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
658
|
|
|
659 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
|
|
|
660
|
|
|
661 if (!(sscf->auth_methods & NGX_MAIL_AUTH_NONE_ENABLED)) {
|
|
|
662 ngx_mail_smtp_log_rejected_command(s, c, "client was rejected: \"%V\"");
|
|
570
|
663 ngx_str_set(&s->out, smtp_auth_required);
|
|
420
|
664 return NGX_OK;
|
|
|
665 }
|
|
|
666
|
|
|
667 /* auth none */
|
|
|
668
|
|
|
669 if (s->smtp_from.len) {
|
|
570
|
670 ngx_str_set(&s->out, smtp_bad_sequence);
|
|
420
|
671 return NGX_OK;
|
|
|
672 }
|
|
|
673
|
|
|
674 l.len = s->buffer->last - s->buffer->start;
|
|
|
675 l.data = s->buffer->start;
|
|
|
676
|
|
|
677 for (i = 0; i < l.len; i++) {
|
|
|
678 ch = l.data[i];
|
|
|
679
|
|
|
680 if (ch != CR && ch != LF) {
|
|
|
681 continue;
|
|
|
682 }
|
|
|
683
|
|
|
684 l.data[i] = ' ';
|
|
|
685 }
|
|
|
686
|
|
|
687 while (i) {
|
|
|
688 if (l.data[i - 1] != ' ') {
|
|
|
689 break;
|
|
|
690 }
|
|
|
691
|
|
|
692 i--;
|
|
|
693 }
|
|
|
694
|
|
|
695 l.len = i;
|
|
|
696
|
|
|
697 s->smtp_from.len = l.len;
|
|
|
698
|
|
|
699 s->smtp_from.data = ngx_pnalloc(c->pool, l.len);
|
|
|
700 if (s->smtp_from.data == NULL) {
|
|
|
701 return NGX_ERROR;
|
|
|
702 }
|
|
|
703
|
|
|
704 ngx_memcpy(s->smtp_from.data, l.data, l.len);
|
|
|
705
|
|
|
706 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
|
707 "smtp mail from:\"%V\"", &s->smtp_from);
|
|
|
708
|
|
570
|
709 ngx_str_set(&s->out, smtp_ok);
|
|
420
|
710
|
|
|
711 return NGX_OK;
|
|
|
712 }
|
|
336
|
713
|
|
420
|
714
|
|
|
715 static ngx_int_t
|
|
|
716 ngx_mail_smtp_rcpt(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
717 {
|
|
|
718 u_char ch;
|
|
|
719 ngx_str_t l;
|
|
|
720 ngx_uint_t i;
|
|
|
721
|
|
|
722 if (s->smtp_from.len == 0) {
|
|
570
|
723 ngx_str_set(&s->out, smtp_bad_sequence);
|
|
420
|
724 return NGX_OK;
|
|
|
725 }
|
|
|
726
|
|
|
727 l.len = s->buffer->last - s->buffer->start;
|
|
|
728 l.data = s->buffer->start;
|
|
|
729
|
|
|
730 for (i = 0; i < l.len; i++) {
|
|
|
731 ch = l.data[i];
|
|
|
732
|
|
|
733 if (ch != CR && ch != LF) {
|
|
|
734 continue;
|
|
|
735 }
|
|
|
736
|
|
|
737 l.data[i] = ' ';
|
|
|
738 }
|
|
|
739
|
|
|
740 while (i) {
|
|
|
741 if (l.data[i - 1] != ' ') {
|
|
|
742 break;
|
|
|
743 }
|
|
|
744
|
|
|
745 i--;
|
|
|
746 }
|
|
|
747
|
|
|
748 l.len = i;
|
|
|
749
|
|
|
750 s->smtp_to.len = l.len;
|
|
|
751
|
|
|
752 s->smtp_to.data = ngx_pnalloc(c->pool, l.len);
|
|
|
753 if (s->smtp_to.data == NULL) {
|
|
|
754 return NGX_ERROR;
|
|
|
755 }
|
|
|
756
|
|
|
757 ngx_memcpy(s->smtp_to.data, l.data, l.len);
|
|
|
758
|
|
|
759 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
|
760 "smtp rcpt to:\"%V\"", &s->smtp_to);
|
|
|
761
|
|
|
762 s->auth_method = NGX_MAIL_AUTH_NONE;
|
|
|
763
|
|
|
764 return NGX_DONE;
|
|
|
765 }
|
|
|
766
|
|
|
767
|
|
|
768 static ngx_int_t
|
|
|
769 ngx_mail_smtp_rset(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
770 {
|
|
570
|
771 ngx_str_null(&s->smtp_from);
|
|
|
772 ngx_str_null(&s->smtp_to);
|
|
|
773 ngx_str_set(&s->out, smtp_ok);
|
|
336
|
774
|
|
|
775 return NGX_OK;
|
|
|
776 }
|
|
|
777
|
|
|
778
|
|
|
779 static ngx_int_t
|
|
|
780 ngx_mail_smtp_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
781 {
|
|
|
782 #if (NGX_MAIL_SSL)
|
|
|
783 ngx_mail_ssl_conf_t *sslcf;
|
|
|
784
|
|
|
785 if (c->ssl == NULL) {
|
|
|
786 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
787 if (sslcf->starttls) {
|
|
|
788
|
|
|
789 /*
|
|
|
790 * RFC3207 requires us to discard any knowledge
|
|
|
791 * obtained from client before STARTTLS.
|
|
|
792 */
|
|
|
793
|
|
570
|
794 ngx_str_null(&s->smtp_helo);
|
|
|
795 ngx_str_null(&s->smtp_from);
|
|
|
796 ngx_str_null(&s->smtp_to);
|
|
336
|
797
|
|
|
798 c->read->handler = ngx_mail_starttls_handler;
|
|
|
799 return NGX_OK;
|
|
|
800 }
|
|
|
801 }
|
|
|
802
|
|
|
803 #endif
|
|
|
804
|
|
|
805 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
806 }
|
|
|
807
|
|
|
808
|
|
|
809 static ngx_int_t
|
|
|
810 ngx_mail_smtp_discard_command(ngx_mail_session_t *s, ngx_connection_t *c,
|
|
|
811 char *err)
|
|
|
812 {
|
|
|
813 ssize_t n;
|
|
|
814
|
|
|
815 n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last);
|
|
|
816
|
|
|
817 if (n == NGX_ERROR || n == 0) {
|
|
|
818 ngx_mail_close_connection(c);
|
|
|
819 return NGX_ERROR;
|
|
|
820 }
|
|
|
821
|
|
|
822 if (n > 0) {
|
|
|
823 s->buffer->last += n;
|
|
|
824 }
|
|
|
825
|
|
|
826 if (n == NGX_AGAIN) {
|
|
430
|
827 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
|
|
336
|
828 ngx_mail_session_internal_server_error(s);
|
|
|
829 return NGX_ERROR;
|
|
|
830 }
|
|
|
831
|
|
|
832 return NGX_AGAIN;
|
|
|
833 }
|
|
|
834
|
|
|
835 ngx_mail_smtp_log_rejected_command(s, c, err);
|
|
|
836
|
|
|
837 s->buffer->pos = s->buffer->start;
|
|
|
838 s->buffer->last = s->buffer->start;
|
|
|
839
|
|
|
840 return NGX_OK;
|
|
|
841 }
|
|
|
842
|
|
|
843
|
|
|
844 static void
|
|
|
845 ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s, ngx_connection_t *c,
|
|
|
846 char *err)
|
|
|
847 {
|
|
|
848 u_char ch;
|
|
|
849 ngx_str_t cmd;
|
|
|
850 ngx_uint_t i;
|
|
|
851
|
|
|
852 if (c->log->log_level < NGX_LOG_INFO) {
|
|
|
853 return;
|
|
|
854 }
|
|
|
855
|
|
|
856 cmd.len = s->buffer->last - s->buffer->start;
|
|
|
857 cmd.data = s->buffer->start;
|
|
|
858
|
|
|
859 for (i = 0; i < cmd.len; i++) {
|
|
|
860 ch = cmd.data[i];
|
|
|
861
|
|
|
862 if (ch != CR && ch != LF) {
|
|
|
863 continue;
|
|
|
864 }
|
|
|
865
|
|
|
866 cmd.data[i] = '_';
|
|
|
867 }
|
|
|
868
|
|
|
869 cmd.len = i;
|
|
|
870
|
|
|
871 ngx_log_error(NGX_LOG_INFO, c->log, 0, err, &cmd);
|
|
|
872 }
|
