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76
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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_imap.h>
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11
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12
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13 static void ngx_imap_init_session(ngx_event_t *rev);
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14 static ngx_int_t ngx_imap_read_command(ngx_imap_session_t *s);
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15
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88
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16 #if (NGX_IMAP_SSL)
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17 static void ngx_imap_ssl_close_handler(ngx_event_t *ev);
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18 #endif
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19
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76
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20
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21 static ngx_str_t greetings[] = {
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22 ngx_string("+OK POP3 ready" CRLF),
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78
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23 ngx_string("* OK IMAP4 ready" CRLF)
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76
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24 };
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25
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26 static ngx_str_t internal_server_errors[] = {
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27 ngx_string("-ERR internal server error" CRLF),
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28 ngx_string("* BAD internal server error" CRLF),
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29 };
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30
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31 static u_char pop3_ok[] = "+OK" CRLF;
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32 static u_char pop3_invalid_command[] = "-ERR invalid command" CRLF;
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33
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78
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34 static u_char imap_ok[] = "OK completed" CRLF;
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76
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35 static u_char imap_next[] = "+ OK" CRLF;
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36 static u_char imap_bye[] = "* BYE" CRLF;
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37 static u_char imap_invalid_command[] = "BAD invalid command" CRLF;
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38
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39
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40 void
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41 ngx_imap_init_connection(ngx_connection_t *c)
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42 {
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88
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43 ngx_imap_session_t *s;
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76
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44 ngx_imap_conf_ctx_t *ctx;
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88
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45 #if (NGX_IMAP_SSL)
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46 ngx_int_t rc;
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47 ngx_imap_ssl_conf_t *sslcf;
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48 #endif
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76
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49 ngx_imap_core_srv_conf_t *cscf;
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50
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51 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap init connection");
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52
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53 c->log_error = NGX_ERROR_INFO;
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54
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55 ctx = c->ctx;
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88
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56
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57 #if (NGX_IMAP_SSL)
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58
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59 sslcf = ngx_imap_get_module_srv_conf(ctx, ngx_imap_ssl_module);
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60
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61 if (sslcf->enable) {
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76
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62
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88
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63 if (ngx_ssl_create_session(sslcf->ssl_ctx, c, NGX_SSL_BUFFER)
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64 == NGX_ERROR)
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65 {
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66 ngx_imap_close_connection(c);
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67 return;
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68 }
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76
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69
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88
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70 rc = ngx_ssl_handshake(c);
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71
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72 if (rc == NGX_ERROR) {
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73 ngx_imap_close_connection(c);
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74 return;
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75 }
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76
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77 c->recv = ngx_ssl_recv;
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78 c->send = ngx_ssl_write;
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79 c->send_chain = ngx_ssl_send_chain;
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80 }
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81
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82 #endif
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83
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84 s = ngx_pcalloc(c->pool, sizeof(ngx_imap_session_t));
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85 if (s == NULL) {
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76
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86 ngx_imap_close_connection(c);
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87 return;
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88 }
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89
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88
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90 c->data = s;
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91 s->connection = c;
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92
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93 cscf = ngx_imap_get_module_srv_conf(ctx, ngx_imap_core_module);
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94 s->protocol = cscf->protocol;
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95
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96 s->ctx = ngx_pcalloc(c->pool, sizeof(void *) * ngx_imap_max_module);
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97 if (s->ctx == NULL) {
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98 ngx_imap_session_internal_server_error(s);
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99 return;
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100 }
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101
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102 s->main_conf = ctx->main_conf;
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103 s->srv_conf = ctx->srv_conf;
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104
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105 s->out = greetings[s->protocol];
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106
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76
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107 c->read->handler = ngx_imap_init_session;
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88
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108 c->write->handler = ngx_imap_send;
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76
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109
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88
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110 ngx_add_timer(c->write, cscf->timeout);
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76
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111 ngx_add_timer(c->read, cscf->timeout);
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112
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113 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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114 ngx_imap_close_connection(c);
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115 }
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88
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116
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117 ngx_imap_send(c->write);
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118 }
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119
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120
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121 void
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122 ngx_imap_send(ngx_event_t *wev)
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123 {
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124 ngx_int_t n;
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125 ngx_connection_t *c;
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126 ngx_imap_session_t *s;
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127
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128 c = wev->data;
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129 s = c->data;
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130
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131 if (wev->timedout) {
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132 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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133 ngx_imap_close_connection(c);
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134 return;
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135 }
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136
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137 if (s->out.len == 0) {
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138 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
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139 ngx_imap_close_connection(c);
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140 }
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141
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142 return;
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143 }
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144
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145 n = c->send(c, s->out.data, s->out.len);
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146
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147 if (n > 0) {
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148 s->out.len -= n;
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149
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150 if (s->quit) {
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151 ngx_imap_close_connection(c);
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152 return;
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153 }
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154
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155 if (s->blocked) {
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156 c->read->handler(c->read);
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157 }
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158
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159 return;
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160 }
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161
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162 if (n == NGX_ERROR) {
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163 ngx_imap_close_connection(c);
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164 return;
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165 }
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166
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167 /* n == NGX_AGAIN */
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168
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169 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
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170 ngx_imap_close_connection(c);
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171 return;
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172 }
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76
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173 }
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174
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175
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176 static void
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177 ngx_imap_init_session(ngx_event_t *rev)
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178 {
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179 size_t size;
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180 ngx_connection_t *c;
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181 ngx_imap_session_t *s;
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182 ngx_imap_core_srv_conf_t *cscf;
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183
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184 c = rev->data;
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185
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186 if (rev->timedout) {
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187 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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188 ngx_imap_close_connection(c);
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189 return;
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190 }
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191
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88
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192 s = c->data;
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76
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193
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194 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) == NGX_ERROR) {
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195 ngx_imap_session_internal_server_error(s);
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196 return;
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197 }
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198
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88
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199 if (s->protocol == NGX_IMAP_POP3_PROTOCOL) {
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76
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200 size = 128;
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201 s->imap_state = ngx_pop3_start;
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202 c->read->handler = ngx_pop3_auth_state;
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203
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204 } else {
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88
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205 cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module);
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206 size = cscf->imap_client_buffer_size;
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207 s->imap_state = ngx_imap_start;
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208 c->read->handler = ngx_imap_auth_state;
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209 }
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210
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211 s->buffer = ngx_create_temp_buf(c->pool, size);
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212 if (s->buffer == NULL) {
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213 ngx_imap_session_internal_server_error(s);
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214 return;
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215 }
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216
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217 c->read->handler(rev);
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218 }
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219
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220
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221 void
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222 ngx_imap_auth_state(ngx_event_t *rev)
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223 {
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88
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224 u_char *text, *last, *p;
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225 ssize_t text_len, last_len;
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76
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226 ngx_str_t *arg;
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227 ngx_int_t rc;
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88
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228 ngx_uint_t tag;
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76
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229 ngx_connection_t *c;
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230 ngx_imap_session_t *s;
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231 ngx_imap_core_srv_conf_t *cscf;
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232
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233 c = rev->data;
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234 s = c->data;
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235
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236 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap auth state");
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237
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238 if (rev->timedout) {
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239 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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240 ngx_imap_close_connection(c);
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241 return;
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242 }
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243
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88
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244 if (s->out.len) {
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245 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap send handler busy");
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246 s->blocked = 1;
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247 return;
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248 }
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249
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250 s->blocked = 0;
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251
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76
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252 rc = ngx_imap_read_command(s);
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253
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254 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap auth: %i", rc);
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255
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256 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
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257 return;
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258 }
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259
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260 tag = 1;
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261
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262 text = NULL;
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263 text_len = 0;
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264
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265 last = imap_ok;
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266 last_len = sizeof(imap_ok) - 1;
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267
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268 if (rc == NGX_OK) {
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269
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270 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap auth command: %i",
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271 s->command);
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272
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273 switch (s->command) {
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274
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275 case NGX_IMAP_LOGIN:
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276 if (s->args.nelts == 2) {
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277
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278 arg = s->args.elts;
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279
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280 s->login.len = arg[0].len;
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281 s->login.data = ngx_palloc(c->pool, s->login.len);
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282 if (s->login.data == NULL) {
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283 ngx_imap_session_internal_server_error(s);
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284 return;
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285 }
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286
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287 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
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288
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289 s->passwd.len = arg[1].len;
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290 s->passwd.data = ngx_palloc(c->pool, s->passwd.len);
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291 if (s->passwd.data == NULL) {
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292 ngx_imap_session_internal_server_error(s);
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293 return;
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294 }
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295
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296 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len);
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297
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298 ngx_log_debug2(NGX_LOG_DEBUG_IMAP, c->log, 0,
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299 "imap login:\"%V\" passwd:\"%V\"",
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300 &s->login, &s->passwd);
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301
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302 s->args.nelts = 0;
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303 s->buffer->pos = s->buffer->start;
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304 s->buffer->last = s->buffer->start;
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305
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306 if (rev->timer_set) {
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307 ngx_del_timer(rev);
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308 }
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309
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310 s->login_attempt++;
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311
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312 ngx_imap_auth_http_init(s);
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313
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314 return;
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315
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316 } else {
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317 rc = NGX_IMAP_PARSE_INVALID_COMMAND;
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318 }
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319
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320 break;
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321
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322 case NGX_IMAP_CAPABILITY:
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323 cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module);
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324 text = cscf->imap_capability->pos;
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325 text_len = cscf->imap_capability->last - cscf->imap_capability->pos;
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326 break;
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327
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328 case NGX_IMAP_LOGOUT:
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88
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329 s->quit = 1;
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76
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330 text = imap_bye;
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331 text_len = sizeof(imap_bye) - 1;
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332 break;
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333
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334 case NGX_IMAP_NOOP:
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335 break;
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336
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337 default:
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338 rc = NGX_IMAP_PARSE_INVALID_COMMAND;
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339 break;
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340 }
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341
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342 } else if (rc == NGX_IMAP_NEXT) {
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343 last = imap_next;
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344 last_len = sizeof(imap_next) - 1;
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345 tag = 0;
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346 }
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347
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348 if (rc == NGX_IMAP_PARSE_INVALID_COMMAND) {
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349 last = imap_invalid_command;
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350 last_len = sizeof(imap_invalid_command) - 1;
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351 }
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352
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353 if (tag) {
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88
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354 if (s->tagged_line.len < s->tag.len + text_len + last_len) {
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355 s->tagged_line.len = s->tag.len + text_len + last_len;
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356 s->tagged_line.data = ngx_palloc(c->pool, s->tagged_line.len);
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357 if (s->tagged_line.data == NULL) {
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76
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358 ngx_imap_close_connection(c);
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359 return;
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360 }
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361 }
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362
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88
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363 s->out.data = s->tagged_line.data;
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364 s->out.len = s->tag.len + text_len + last_len;
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365
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366 p = s->out.data;
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76
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367
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368 if (text) {
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369 p = ngx_cpymem(p, text, text_len);
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370 }
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371 p = ngx_cpymem(p, s->tag.data, s->tag.len);
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372 ngx_memcpy(p, last, last_len);
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373
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374
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375 } else {
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88
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376 s->out.data = last;
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377 s->out.len = last_len;
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76
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378 }
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379
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88
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380 if (rc != NGX_IMAP_NEXT) {
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381 s->args.nelts = 0;
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382 s->buffer->pos = s->buffer->start;
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383 s->buffer->last = s->buffer->start;
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384 s->tag.len = 0;
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76
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385 }
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386
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88
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387 ngx_imap_send(c->write);
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76
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388 }
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389
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390
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391 void
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392 ngx_pop3_auth_state(ngx_event_t *rev)
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393 {
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394 u_char *text;
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395 ssize_t size;
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396 ngx_int_t rc;
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397 ngx_str_t *arg;
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398 ngx_connection_t *c;
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399 ngx_imap_session_t *s;
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400 ngx_imap_core_srv_conf_t *cscf;
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401
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402 c = rev->data;
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403 s = c->data;
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404
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405 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0, "pop3 auth state");
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406
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407 if (rev->timedout) {
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408 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
|
|
|
409 ngx_imap_close_connection(c);
|
|
|
410 return;
|
|
|
411 }
|
|
|
412
|
|
88
|
413 if (s->out.len) {
|
|
|
414 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap send handler busy");
|
|
|
415 s->blocked = 1;
|
|
|
416 return;
|
|
|
417 }
|
|
|
418
|
|
|
419 s->blocked = 0;
|
|
|
420
|
|
76
|
421 rc = ngx_imap_read_command(s);
|
|
|
422
|
|
|
423 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
|
|
|
424 return;
|
|
|
425 }
|
|
|
426
|
|
|
427 text = pop3_ok;
|
|
|
428 size = sizeof(pop3_ok) - 1;
|
|
|
429
|
|
|
430 if (rc == NGX_OK) {
|
|
|
431 switch (s->imap_state) {
|
|
|
432
|
|
|
433 case ngx_pop3_start:
|
|
|
434
|
|
|
435 switch (s->command) {
|
|
|
436
|
|
|
437 case NGX_POP3_USER:
|
|
|
438 if (s->args.nelts == 1) {
|
|
|
439 s->imap_state = ngx_pop3_user;
|
|
|
440
|
|
|
441 arg = s->args.elts;
|
|
|
442 s->login.len = arg[0].len;
|
|
|
443 s->login.data = ngx_palloc(c->pool, s->login.len);
|
|
|
444 if (s->login.data == NULL) {
|
|
|
445 ngx_imap_session_internal_server_error(s);
|
|
|
446 return;
|
|
|
447 }
|
|
|
448
|
|
|
449 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
|
|
|
450
|
|
|
451 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0,
|
|
|
452 "pop3 login: \"%V\"", &s->login);
|
|
|
453
|
|
|
454 } else {
|
|
|
455 rc = NGX_IMAP_PARSE_INVALID_COMMAND;
|
|
|
456 }
|
|
|
457
|
|
|
458 break;
|
|
|
459
|
|
|
460 case NGX_POP3_CAPA:
|
|
|
461 cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module);
|
|
|
462 text = cscf->pop3_capability->pos;
|
|
|
463 size = cscf->pop3_capability->last - cscf->pop3_capability->pos;
|
|
|
464 break;
|
|
|
465
|
|
|
466 case NGX_POP3_QUIT:
|
|
88
|
467 s->quit = 1;
|
|
76
|
468 break;
|
|
|
469
|
|
|
470 case NGX_POP3_NOOP:
|
|
|
471 break;
|
|
|
472
|
|
|
473 default:
|
|
|
474 s->imap_state = ngx_pop3_start;
|
|
|
475 rc = NGX_IMAP_PARSE_INVALID_COMMAND;
|
|
|
476 break;
|
|
|
477 }
|
|
|
478
|
|
|
479 break;
|
|
|
480
|
|
|
481 case ngx_pop3_user:
|
|
|
482
|
|
|
483 switch (s->command) {
|
|
|
484
|
|
|
485 case NGX_POP3_PASS:
|
|
|
486 if (s->args.nelts == 1) {
|
|
|
487 /* STUB */ s->imap_state = ngx_pop3_start;
|
|
|
488
|
|
|
489 arg = s->args.elts;
|
|
|
490 s->passwd.len = arg[0].len;
|
|
|
491 s->passwd.data = ngx_palloc(c->pool, s->passwd.len);
|
|
|
492 if (s->passwd.data == NULL) {
|
|
|
493 ngx_imap_session_internal_server_error(s);
|
|
|
494 return;
|
|
|
495 }
|
|
|
496
|
|
|
497 ngx_memcpy(s->passwd.data, arg[0].data, s->passwd.len);
|
|
|
498
|
|
|
499 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0,
|
|
|
500 "pop3 passwd: \"%V\"", &s->passwd);
|
|
|
501
|
|
|
502 s->args.nelts = 0;
|
|
|
503 s->buffer->pos = s->buffer->start;
|
|
|
504 s->buffer->last = s->buffer->start;
|
|
|
505
|
|
|
506 if (rev->timer_set) {
|
|
|
507 ngx_del_timer(rev);
|
|
|
508 }
|
|
|
509
|
|
|
510 ngx_imap_auth_http_init(s);
|
|
|
511
|
|
|
512 return;
|
|
|
513
|
|
|
514 } else {
|
|
|
515 rc = NGX_IMAP_PARSE_INVALID_COMMAND;
|
|
|
516 }
|
|
|
517
|
|
|
518 break;
|
|
|
519
|
|
|
520 case NGX_POP3_CAPA:
|
|
|
521 cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module);
|
|
|
522 text = cscf->pop3_capability->pos;
|
|
|
523 size = cscf->pop3_capability->last - cscf->pop3_capability->pos;
|
|
|
524 break;
|
|
|
525
|
|
|
526 case NGX_POP3_QUIT:
|
|
88
|
527 s->quit = 1;
|
|
76
|
528 break;
|
|
|
529
|
|
|
530 case NGX_POP3_NOOP:
|
|
|
531 break;
|
|
|
532
|
|
|
533 default:
|
|
|
534 s->imap_state = ngx_pop3_start;
|
|
|
535 rc = NGX_IMAP_PARSE_INVALID_COMMAND;
|
|
|
536 break;
|
|
|
537 }
|
|
|
538
|
|
|
539 break;
|
|
|
540
|
|
|
541 /* suppress warinings */
|
|
|
542 case ngx_pop3_passwd:
|
|
|
543 break;
|
|
|
544 }
|
|
|
545 }
|
|
|
546
|
|
|
547 if (rc == NGX_IMAP_PARSE_INVALID_COMMAND) {
|
|
|
548 text = pop3_invalid_command;
|
|
|
549 size = sizeof(pop3_invalid_command) - 1;
|
|
|
550 }
|
|
|
551
|
|
|
552 s->args.nelts = 0;
|
|
|
553 s->buffer->pos = s->buffer->start;
|
|
|
554 s->buffer->last = s->buffer->start;
|
|
88
|
555
|
|
|
556 s->out.data = text;
|
|
|
557 s->out.len = size;
|
|
|
558
|
|
|
559 ngx_imap_send(c->write);
|
|
76
|
560 }
|
|
|
561
|
|
|
562
|
|
|
563 static ngx_int_t
|
|
|
564 ngx_imap_read_command(ngx_imap_session_t *s)
|
|
|
565 {
|
|
|
566 ssize_t n;
|
|
|
567 ngx_int_t rc;
|
|
|
568
|
|
88
|
569 n = s->connection->recv(s->connection, s->buffer->last,
|
|
|
570 s->buffer->end - s->buffer->last);
|
|
76
|
571
|
|
|
572 if (n == NGX_ERROR || n == 0) {
|
|
|
573 ngx_imap_close_connection(s->connection);
|
|
|
574 return NGX_ERROR;
|
|
|
575 }
|
|
|
576
|
|
|
577 if (n > 0) {
|
|
|
578 s->buffer->last += n;
|
|
|
579 }
|
|
|
580
|
|
|
581 if (n == NGX_AGAIN) {
|
|
|
582 if (ngx_handle_read_event(s->connection->read, 0) == NGX_ERROR) {
|
|
|
583 ngx_imap_session_internal_server_error(s);
|
|
|
584 return NGX_ERROR;
|
|
|
585 }
|
|
|
586
|
|
|
587 return NGX_AGAIN;
|
|
|
588 }
|
|
|
589
|
|
|
590 if (s->protocol == NGX_IMAP_POP3_PROTOCOL) {
|
|
|
591 rc = ngx_pop3_parse_command(s);
|
|
|
592 } else {
|
|
|
593 rc = ngx_imap_parse_command(s);
|
|
|
594 }
|
|
|
595
|
|
|
596 if (rc == NGX_AGAIN
|
|
|
597 || rc == NGX_IMAP_NEXT
|
|
|
598 || rc == NGX_IMAP_PARSE_INVALID_COMMAND)
|
|
|
599 {
|
|
|
600 return rc;
|
|
|
601 }
|
|
|
602
|
|
|
603 if (rc == NGX_ERROR) {
|
|
|
604 ngx_imap_close_connection(s->connection);
|
|
|
605 return NGX_ERROR;
|
|
|
606 }
|
|
|
607
|
|
|
608 return NGX_OK;
|
|
|
609 }
|
|
|
610
|
|
|
611
|
|
|
612 void
|
|
|
613 ngx_imap_session_internal_server_error(ngx_imap_session_t *s)
|
|
|
614 {
|
|
88
|
615 s->out = internal_server_errors[s->protocol];
|
|
|
616 s->quit = 1;
|
|
76
|
617
|
|
88
|
618 ngx_imap_send(s->connection->write);
|
|
76
|
619 }
|
|
|
620
|
|
|
621
|
|
|
622 void
|
|
|
623 ngx_imap_close_connection(ngx_connection_t *c)
|
|
|
624 {
|
|
|
625 ngx_pool_t *pool;
|
|
|
626
|
|
|
627 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0,
|
|
|
628 "close imap connection: %d", c->fd);
|
|
|
629
|
|
88
|
630 #if (NGX_IMAP_SSL)
|
|
|
631
|
|
|
632 if (c->ssl) {
|
|
|
633 if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
|
|
|
634 c->read->handler = ngx_imap_ssl_close_handler;
|
|
|
635 c->write->handler = ngx_imap_ssl_close_handler;
|
|
|
636 return;
|
|
|
637 }
|
|
|
638 }
|
|
|
639
|
|
|
640 #endif
|
|
|
641
|
|
76
|
642 pool = c->pool;
|
|
|
643
|
|
|
644 ngx_close_connection(c);
|
|
|
645
|
|
|
646 ngx_destroy_pool(pool);
|
|
|
647 }
|
|
88
|
648
|
|
|
649
|
|
|
650 #if (NGX_IMAP_SSL)
|
|
|
651
|
|
|
652 static void
|
|
|
653 ngx_imap_ssl_close_handler(ngx_event_t *ev)
|
|
|
654 {
|
|
|
655 ngx_connection_t *c;
|
|
|
656
|
|
|
657 c = ev->data;
|
|
|
658
|
|
|
659 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, ev->log, 0, "http ssl close handler");
|
|
|
660
|
|
|
661 if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
|
|
|
662 return;
|
|
|
663 }
|
|
|
664
|
|
|
665 ngx_imap_close_connection(c);
|
|
|
666 }
|
|
|
667
|
|
|
668 #endif
|
