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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_pop3_module.h>
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12
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13
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14 static ngx_int_t ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c);
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15 static ngx_int_t ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c);
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16 static ngx_int_t ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c,
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17 ngx_int_t stls);
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18 static ngx_int_t ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c);
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19 static ngx_int_t ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c);
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20 static ngx_int_t ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c);
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21
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22
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23 static u_char pop3_greeting[] = "+OK POP3 ready" CRLF;
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24 static u_char pop3_ok[] = "+OK" CRLF;
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25 static u_char pop3_next[] = "+ " CRLF;
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26 static u_char pop3_username[] = "+ VXNlcm5hbWU6" CRLF;
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27 static u_char pop3_password[] = "+ UGFzc3dvcmQ6" CRLF;
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28 static u_char pop3_invalid_command[] = "-ERR invalid command" CRLF;
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29
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30
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31 void
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32 ngx_mail_pop3_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
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33 {
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34 u_char *p;
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35 ngx_mail_core_srv_conf_t *cscf;
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36 ngx_mail_pop3_srv_conf_t *pscf;
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37
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38 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
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39 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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40
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41 if (pscf->auth_methods
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42 & (NGX_MAIL_AUTH_APOP_ENABLED|NGX_MAIL_AUTH_CRAM_MD5_ENABLED))
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43 {
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44 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
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45 ngx_mail_session_internal_server_error(s);
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46 return;
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47 }
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48
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49 s->out.data = ngx_palloc(c->pool, sizeof(pop3_greeting) + s->salt.len);
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50 if (s->out.data == NULL) {
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51 ngx_mail_session_internal_server_error(s);
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52 return;
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53 }
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54
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55 p = ngx_cpymem(s->out.data, pop3_greeting, sizeof(pop3_greeting) - 3);
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56 *p++ = ' ';
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57 p = ngx_cpymem(p, s->salt.data, s->salt.len);
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58
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59 s->out.len = p - s->out.data;
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60
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61 } else {
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62 s->out.len = sizeof(pop3_greeting) - 1;
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63 s->out.data = pop3_greeting;
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64 }
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65
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66 c->read->handler = ngx_mail_pop3_init_protocol;
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67
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68 ngx_add_timer(c->read, cscf->timeout);
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69
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70 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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71 ngx_mail_close_connection(c);
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72 }
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73
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74 ngx_mail_send(c->write);
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75 }
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76
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77
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78 void
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79 ngx_mail_pop3_init_protocol(ngx_event_t *rev)
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80 {
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81 ngx_connection_t *c;
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82 ngx_mail_session_t *s;
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83
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84 c = rev->data;
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85
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86 c->log->action = "in auth state";
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87
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88 if (rev->timedout) {
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89 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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90 c->timedout = 1;
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91 ngx_mail_close_connection(c);
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92 return;
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93 }
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94
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95 s = c->data;
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96
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97 if (s->buffer == NULL) {
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98 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t))
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99 == NGX_ERROR)
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100 {
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101 ngx_mail_session_internal_server_error(s);
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102 return;
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103 }
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104
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105 s->buffer = ngx_create_temp_buf(c->pool, 128);
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106 if (s->buffer == NULL) {
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107 ngx_mail_session_internal_server_error(s);
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108 return;
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109 }
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110 }
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111
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112 s->mail_state = ngx_pop3_start;
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113 c->read->handler = ngx_mail_pop3_auth_state;
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114
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115 ngx_mail_pop3_auth_state(rev);
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116 }
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117
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118
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119 void
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120 ngx_mail_pop3_auth_state(ngx_event_t *rev)
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121 {
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122 ngx_int_t rc;
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123 ngx_connection_t *c;
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124 ngx_mail_session_t *s;
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125
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126 c = rev->data;
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127 s = c->data;
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128
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129 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 auth state");
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130
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131 if (rev->timedout) {
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132 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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133 c->timedout = 1;
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134 ngx_mail_close_connection(c);
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135 return;
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136 }
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137
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138 if (s->out.len) {
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139 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 send handler busy");
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140 s->blocked = 1;
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141 return;
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142 }
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143
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144 s->blocked = 0;
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145
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146 rc = ngx_mail_read_command(s, c);
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147
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148 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
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149 return;
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150 }
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151
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152 s->out.len = sizeof(pop3_ok) - 1;
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153 s->out.data = pop3_ok;
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154
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155 if (rc == NGX_OK) {
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156 switch (s->mail_state) {
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157
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158 case ngx_pop3_start:
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159
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160 switch (s->command) {
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161
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162 case NGX_POP3_USER:
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163 rc = ngx_mail_pop3_user(s, c);
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164 break;
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165
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166 case NGX_POP3_CAPA:
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167 rc = ngx_mail_pop3_capa(s, c, 1);
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168 break;
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169
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170 case NGX_POP3_APOP:
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171 rc = ngx_mail_pop3_apop(s, c);
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172 break;
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173
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174 case NGX_POP3_AUTH:
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175 rc = ngx_mail_pop3_auth(s, c);
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176 break;
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177
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178 case NGX_POP3_QUIT:
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179 s->quit = 1;
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180 break;
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181
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182 case NGX_POP3_NOOP:
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183 break;
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184
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185 case NGX_POP3_STLS:
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186 rc = ngx_mail_pop3_stls(s, c);
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187 break;
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188
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189 default:
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190 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
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191 s->mail_state = ngx_pop3_start;
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192 break;
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193 }
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194
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195 break;
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196
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197 case ngx_pop3_user:
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198
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199 switch (s->command) {
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200
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201 case NGX_POP3_PASS:
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202 rc = ngx_mail_pop3_pass(s, c);
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203 break;
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204
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205 case NGX_POP3_CAPA:
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206 rc = ngx_mail_pop3_capa(s, c, 0);
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207 break;
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208
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209 case NGX_POP3_QUIT:
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210 s->quit = 1;
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211 break;
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212
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213 case NGX_POP3_NOOP:
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214 break;
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215
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216 default:
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217 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
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218 s->mail_state = ngx_pop3_start;
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219 break;
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220 }
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221
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222 break;
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223
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224 /* suppress warinings */
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225 case ngx_pop3_passwd:
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226 break;
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227
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228 case ngx_pop3_auth_login_username:
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386
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229 rc = ngx_mail_auth_login_username(s, c, 0);
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336
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230
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231 s->out.len = sizeof(pop3_password) - 1;
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232 s->out.data = pop3_password;
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233 s->mail_state = ngx_pop3_auth_login_password;
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234 break;
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235
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236 case ngx_pop3_auth_login_password:
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237 rc = ngx_mail_auth_login_password(s, c);
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238 break;
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239
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240 case ngx_pop3_auth_plain:
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241 rc = ngx_mail_auth_plain(s, c, 0);
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242 break;
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243
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244 case ngx_pop3_auth_cram_md5:
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245 rc = ngx_mail_auth_cram_md5(s, c);
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246 break;
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247 }
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248 }
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249
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250 switch (rc) {
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251
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252 case NGX_DONE:
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253 ngx_mail_auth(s, c);
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254 return;
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255
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256 case NGX_ERROR:
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257 ngx_mail_session_internal_server_error(s);
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258 return;
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259
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260 case NGX_MAIL_PARSE_INVALID_COMMAND:
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261 s->mail_state = ngx_pop3_start;
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262 s->state = 0;
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263
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264 s->out.len = sizeof(pop3_invalid_command) - 1;
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265 s->out.data = pop3_invalid_command;
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266
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267 /* fall through */
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268
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269 case NGX_OK:
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270
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271 s->args.nelts = 0;
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272 s->buffer->pos = s->buffer->start;
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273 s->buffer->last = s->buffer->start;
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274
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275 if (s->state) {
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276 s->arg_start = s->buffer->start;
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277 }
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278
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279 ngx_mail_send(c->write);
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280 }
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281 }
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282
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283 static ngx_int_t
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284 ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c)
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285 {
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356
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286 ngx_str_t *arg;
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336
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287
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288 #if (NGX_MAIL_SSL)
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289 if (ngx_mail_starttls_only(s, c)) {
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290 return NGX_MAIL_PARSE_INVALID_COMMAND;
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291 }
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292 #endif
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293
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294 if (s->args.nelts != 1) {
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295 return NGX_MAIL_PARSE_INVALID_COMMAND;
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296 }
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297
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298 arg = s->args.elts;
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299 s->login.len = arg[0].len;
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300 s->login.data = ngx_palloc(c->pool, s->login.len);
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301 if (s->login.data == NULL) {
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302 return NGX_ERROR;
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303 }
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304
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305 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
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306
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307 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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308 "pop3 login: \"%V\"", &s->login);
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309
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310 s->mail_state = ngx_pop3_user;
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311
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312 return NGX_OK;
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313 }
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314
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315
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316 static ngx_int_t
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317 ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c)
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318 {
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319 ngx_str_t *arg;
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320
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321 if (s->args.nelts != 1) {
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322 return NGX_MAIL_PARSE_INVALID_COMMAND;
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323 }
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324
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325 arg = s->args.elts;
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326 s->passwd.len = arg[0].len;
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327 s->passwd.data = ngx_palloc(c->pool, s->passwd.len);
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328 if (s->passwd.data == NULL) {
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329 return NGX_ERROR;
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330 }
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331
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332 ngx_memcpy(s->passwd.data, arg[0].data, s->passwd.len);
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333
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334 #if (NGX_DEBUG_MAIL_PASSWD)
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335 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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336 "pop3 passwd: \"%V\"", &s->passwd);
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337 #endif
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338
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339 return NGX_DONE;
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340 }
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341
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342
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343 static ngx_int_t
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344 ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, ngx_int_t stls)
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345 {
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346 ngx_mail_pop3_srv_conf_t *pscf;
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347
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348 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
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349
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350 #if (NGX_MAIL_SSL)
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351
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352 if (stls && c->ssl == NULL) {
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356
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353 ngx_mail_ssl_conf_t *sslcf;
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354
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336
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355 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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356
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357 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
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358 s->out = pscf->starttls_capability;
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359 return NGX_OK;
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360 }
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361
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362 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
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363 s->out = pscf->starttls_only_capability;
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364 return NGX_OK;
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365 }
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366 }
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367
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368 #endif
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369
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370 s->out = pscf->capability;
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371 return NGX_OK;
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372 }
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373
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374
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375 static ngx_int_t
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376 ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c)
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377 {
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378 #if (NGX_MAIL_SSL)
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379 ngx_mail_ssl_conf_t *sslcf;
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380
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381 if (c->ssl == NULL) {
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382 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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383 if (sslcf->starttls) {
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384 c->read->handler = ngx_mail_starttls_handler;
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385 return NGX_OK;
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386 }
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387 }
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388
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389 #endif
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390
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391 return NGX_MAIL_PARSE_INVALID_COMMAND;
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392 }
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393
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394
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395 static ngx_int_t
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396 ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c)
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397 {
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398 ngx_str_t *arg;
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399 ngx_mail_pop3_srv_conf_t *pscf;
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400
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401 #if (NGX_MAIL_SSL)
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402 if (ngx_mail_starttls_only(s, c)) {
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403 return NGX_MAIL_PARSE_INVALID_COMMAND;
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404 }
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405 #endif
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406
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407 if (s->args.nelts != 2) {
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|
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408 return NGX_MAIL_PARSE_INVALID_COMMAND;
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|
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409 }
|
|
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410
|
|
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411 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
|
|
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412
|
|
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413 if (!(pscf->auth_methods & NGX_MAIL_AUTH_APOP_ENABLED)) {
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414 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
415 }
|
|
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416
|
|
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417 arg = s->args.elts;
|
|
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418
|
|
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419 s->login.len = arg[0].len;
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|
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420 s->login.data = ngx_palloc(c->pool, s->login.len);
|
|
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421 if (s->login.data == NULL) {
|
|
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422 return NGX_ERROR;
|
|
|
423 }
|
|
|
424
|
|
|
425 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
|
|
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426
|
|
|
427 s->passwd.len = arg[1].len;
|
|
|
428 s->passwd.data = ngx_palloc(c->pool, s->passwd.len);
|
|
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429 if (s->passwd.data == NULL) {
|
|
|
430 return NGX_ERROR;
|
|
|
431 }
|
|
|
432
|
|
|
433 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len);
|
|
|
434
|
|
|
435 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
|
436 "pop3 apop: \"%V\" \"%V\"", &s->login, &s->passwd);
|
|
|
437
|
|
|
438 s->auth_method = NGX_MAIL_AUTH_APOP;
|
|
|
439
|
|
|
440 return NGX_DONE;
|
|
|
441 }
|
|
|
442
|
|
|
443
|
|
|
444 static ngx_int_t
|
|
|
445 ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
446 {
|
|
|
447 ngx_int_t rc;
|
|
|
448 ngx_mail_pop3_srv_conf_t *pscf;
|
|
|
449
|
|
|
450 #if (NGX_MAIL_SSL)
|
|
|
451 if (ngx_mail_starttls_only(s, c)) {
|
|
|
452 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
453 }
|
|
|
454 #endif
|
|
|
455
|
|
|
456 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
|
|
|
457
|
|
|
458 if (s->args.nelts == 0) {
|
|
|
459 s->out = pscf->auth_capability;
|
|
|
460 s->state = 0;
|
|
|
461
|
|
|
462 return NGX_OK;
|
|
|
463 }
|
|
|
464
|
|
|
465 rc = ngx_mail_auth_parse(s, c);
|
|
|
466
|
|
|
467 switch (rc) {
|
|
|
468
|
|
|
469 case NGX_MAIL_AUTH_LOGIN:
|
|
|
470
|
|
|
471 s->out.len = sizeof(pop3_username) - 1;
|
|
|
472 s->out.data = pop3_username;
|
|
|
473 s->mail_state = ngx_pop3_auth_login_username;
|
|
|
474
|
|
|
475 return NGX_OK;
|
|
|
476
|
|
386
|
477 case NGX_MAIL_AUTH_LOGIN_USERNAME:
|
|
|
478
|
|
|
479 s->out.len = sizeof(pop3_password) - 1;
|
|
|
480 s->out.data = pop3_password;
|
|
|
481 s->mail_state = ngx_pop3_auth_login_password;
|
|
|
482
|
|
|
483 return ngx_mail_auth_login_username(s, c, 1);
|
|
|
484
|
|
336
|
485 case NGX_MAIL_AUTH_PLAIN:
|
|
|
486
|
|
|
487 s->out.len = sizeof(pop3_next) - 1;
|
|
|
488 s->out.data = pop3_next;
|
|
|
489 s->mail_state = ngx_pop3_auth_plain;
|
|
|
490
|
|
|
491 return NGX_OK;
|
|
|
492
|
|
|
493 case NGX_MAIL_AUTH_CRAM_MD5:
|
|
|
494
|
|
|
495 if (!(pscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
|
|
|
496 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
497 }
|
|
|
498
|
|
|
499 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) {
|
|
|
500 s->mail_state = ngx_pop3_auth_cram_md5;
|
|
|
501 return NGX_OK;
|
|
|
502 }
|
|
|
503
|
|
|
504 return NGX_ERROR;
|
|
|
505 }
|
|
|
506
|
|
|
507 return rc;
|
|
|
508 }
|
