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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382
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49 s->out.data = ngx_pnalloc(c->pool, sizeof(pop3_greeting) + s->salt.len);
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336
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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 ngx_str_set(&s->out, pop3_greeting);
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336
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63 }
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64
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65 c->read->handler = ngx_mail_pop3_init_protocol;
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66
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67 ngx_add_timer(c->read, cscf->timeout);
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68
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430
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69 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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336
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70 ngx_mail_close_connection(c);
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71 }
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72
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73 ngx_mail_send(c->write);
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74 }
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75
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76
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77 void
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78 ngx_mail_pop3_init_protocol(ngx_event_t *rev)
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79 {
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80 ngx_connection_t *c;
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81 ngx_mail_session_t *s;
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82
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83 c = rev->data;
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84
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85 c->log->action = "in auth state";
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86
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87 if (rev->timedout) {
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88 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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89 c->timedout = 1;
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90 ngx_mail_close_connection(c);
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91 return;
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92 }
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93
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94 s = c->data;
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95
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96 if (s->buffer == NULL) {
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97 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t))
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98 == NGX_ERROR)
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99 {
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100 ngx_mail_session_internal_server_error(s);
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101 return;
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102 }
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103
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104 s->buffer = ngx_create_temp_buf(c->pool, 128);
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105 if (s->buffer == NULL) {
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106 ngx_mail_session_internal_server_error(s);
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107 return;
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108 }
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109 }
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110
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111 s->mail_state = ngx_pop3_start;
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112 c->read->handler = ngx_mail_pop3_auth_state;
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113
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114 ngx_mail_pop3_auth_state(rev);
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115 }
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116
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117
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118 void
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119 ngx_mail_pop3_auth_state(ngx_event_t *rev)
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120 {
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121 ngx_int_t rc;
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122 ngx_connection_t *c;
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123 ngx_mail_session_t *s;
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124
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125 c = rev->data;
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126 s = c->data;
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127
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128 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 auth state");
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129
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130 if (rev->timedout) {
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131 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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132 c->timedout = 1;
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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 if (s->out.len) {
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138 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 send handler busy");
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139 s->blocked = 1;
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140 return;
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141 }
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142
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143 s->blocked = 0;
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144
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145 rc = ngx_mail_read_command(s, c);
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146
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147 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
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148 return;
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149 }
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150
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570
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151 ngx_str_set(&s->out, pop3_ok);
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152
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153 if (rc == NGX_OK) {
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154 switch (s->mail_state) {
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155
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156 case ngx_pop3_start:
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157
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158 switch (s->command) {
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159
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160 case NGX_POP3_USER:
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161 rc = ngx_mail_pop3_user(s, c);
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162 break;
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163
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164 case NGX_POP3_CAPA:
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165 rc = ngx_mail_pop3_capa(s, c, 1);
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166 break;
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167
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168 case NGX_POP3_APOP:
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169 rc = ngx_mail_pop3_apop(s, c);
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170 break;
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171
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172 case NGX_POP3_AUTH:
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173 rc = ngx_mail_pop3_auth(s, c);
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174 break;
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175
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176 case NGX_POP3_QUIT:
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177 s->quit = 1;
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178 break;
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179
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180 case NGX_POP3_NOOP:
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181 break;
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182
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183 case NGX_POP3_STLS:
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184 rc = ngx_mail_pop3_stls(s, c);
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185 break;
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186
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187 default:
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188 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
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189 break;
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190 }
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191
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192 break;
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193
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194 case ngx_pop3_user:
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195
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196 switch (s->command) {
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197
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198 case NGX_POP3_PASS:
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199 rc = ngx_mail_pop3_pass(s, c);
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200 break;
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201
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202 case NGX_POP3_CAPA:
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203 rc = ngx_mail_pop3_capa(s, c, 0);
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204 break;
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205
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206 case NGX_POP3_QUIT:
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207 s->quit = 1;
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208 break;
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209
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210 case NGX_POP3_NOOP:
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211 break;
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212
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213 default:
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214 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
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215 break;
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216 }
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217
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218 break;
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219
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220 /* suppress warinings */
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221 case ngx_pop3_passwd:
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222 break;
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223
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224 case ngx_pop3_auth_login_username:
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444
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225 rc = ngx_mail_auth_login_username(s, c, 0);
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226
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227 ngx_str_set(&s->out, pop3_password);
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228 s->mail_state = ngx_pop3_auth_login_password;
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229 break;
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230
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231 case ngx_pop3_auth_login_password:
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232 rc = ngx_mail_auth_login_password(s, c);
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233 break;
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234
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235 case ngx_pop3_auth_plain:
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236 rc = ngx_mail_auth_plain(s, c, 0);
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237 break;
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238
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239 case ngx_pop3_auth_cram_md5:
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240 rc = ngx_mail_auth_cram_md5(s, c);
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241 break;
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242 }
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243 }
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244
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245 switch (rc) {
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246
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247 case NGX_DONE:
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248 ngx_mail_auth(s, c);
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249 return;
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250
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251 case NGX_ERROR:
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252 ngx_mail_session_internal_server_error(s);
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253 return;
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254
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255 case NGX_MAIL_PARSE_INVALID_COMMAND:
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256 s->mail_state = ngx_pop3_start;
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257 s->state = 0;
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258
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570
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259 ngx_str_set(&s->out, pop3_invalid_command);
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260
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261 /* fall through */
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262
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263 case NGX_OK:
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264
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265 s->args.nelts = 0;
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266 s->buffer->pos = s->buffer->start;
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267 s->buffer->last = s->buffer->start;
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268
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269 if (s->state) {
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270 s->arg_start = s->buffer->start;
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271 }
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272
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273 ngx_mail_send(c->write);
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274 }
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275 }
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276
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277 static ngx_int_t
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278 ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c)
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279 {
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280 ngx_str_t *arg;
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281
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282 #if (NGX_MAIL_SSL)
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283 if (ngx_mail_starttls_only(s, c)) {
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284 return NGX_MAIL_PARSE_INVALID_COMMAND;
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285 }
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286 #endif
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287
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288 if (s->args.nelts != 1) {
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289 return NGX_MAIL_PARSE_INVALID_COMMAND;
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290 }
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291
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292 arg = s->args.elts;
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293 s->login.len = arg[0].len;
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382
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294 s->login.data = ngx_pnalloc(c->pool, s->login.len);
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336
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295 if (s->login.data == NULL) {
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296 return NGX_ERROR;
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297 }
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298
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299 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
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300
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301 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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302 "pop3 login: \"%V\"", &s->login);
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303
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304 s->mail_state = ngx_pop3_user;
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305
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306 return NGX_OK;
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307 }
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308
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309
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310 static ngx_int_t
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311 ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c)
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312 {
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313 ngx_str_t *arg;
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314
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315 if (s->args.nelts != 1) {
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316 return NGX_MAIL_PARSE_INVALID_COMMAND;
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317 }
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318
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319 arg = s->args.elts;
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320 s->passwd.len = arg[0].len;
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382
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321 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len);
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336
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322 if (s->passwd.data == NULL) {
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323 return NGX_ERROR;
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324 }
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325
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326 ngx_memcpy(s->passwd.data, arg[0].data, s->passwd.len);
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327
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328 #if (NGX_DEBUG_MAIL_PASSWD)
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329 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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330 "pop3 passwd: \"%V\"", &s->passwd);
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331 #endif
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332
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333 return NGX_DONE;
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334 }
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335
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336
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337 static ngx_int_t
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338 ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, ngx_int_t stls)
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339 {
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340 ngx_mail_pop3_srv_conf_t *pscf;
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341
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342 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
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343
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344 #if (NGX_MAIL_SSL)
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345
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346 if (stls && c->ssl == NULL) {
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356
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347 ngx_mail_ssl_conf_t *sslcf;
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348
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336
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349 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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350
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351 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
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352 s->out = pscf->starttls_capability;
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353 return NGX_OK;
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354 }
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355
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356 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
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357 s->out = pscf->starttls_only_capability;
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358 return NGX_OK;
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359 }
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360 }
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361
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362 #endif
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363
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364 s->out = pscf->capability;
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365 return NGX_OK;
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366 }
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367
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368
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369 static ngx_int_t
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370 ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c)
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371 {
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372 #if (NGX_MAIL_SSL)
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373 ngx_mail_ssl_conf_t *sslcf;
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374
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375 if (c->ssl == NULL) {
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376 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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377 if (sslcf->starttls) {
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378 c->read->handler = ngx_mail_starttls_handler;
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379 return NGX_OK;
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380 }
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381 }
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382
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383 #endif
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384
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385 return NGX_MAIL_PARSE_INVALID_COMMAND;
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386 }
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387
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388
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389 static ngx_int_t
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390 ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c)
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391 {
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392 ngx_str_t *arg;
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393 ngx_mail_pop3_srv_conf_t *pscf;
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394
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395 #if (NGX_MAIL_SSL)
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396 if (ngx_mail_starttls_only(s, c)) {
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397 return NGX_MAIL_PARSE_INVALID_COMMAND;
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398 }
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399 #endif
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400
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401 if (s->args.nelts != 2) {
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402 return NGX_MAIL_PARSE_INVALID_COMMAND;
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403 }
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404
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405 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
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406
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407 if (!(pscf->auth_methods & NGX_MAIL_AUTH_APOP_ENABLED)) {
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408 return NGX_MAIL_PARSE_INVALID_COMMAND;
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409 }
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410
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411 arg = s->args.elts;
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412
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413 s->login.len = arg[0].len;
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382
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414 s->login.data = ngx_pnalloc(c->pool, s->login.len);
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336
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415 if (s->login.data == NULL) {
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416 return NGX_ERROR;
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417 }
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418
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419 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
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420
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421 s->passwd.len = arg[1].len;
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382
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422 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len);
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336
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423 if (s->passwd.data == NULL) {
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424 return NGX_ERROR;
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425 }
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426
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427 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len);
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428
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429 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
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430 "pop3 apop: \"%V\" \"%V\"", &s->login, &s->passwd);
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431
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432 s->auth_method = NGX_MAIL_AUTH_APOP;
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433
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434 return NGX_DONE;
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435 }
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436
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437
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438 static ngx_int_t
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439 ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c)
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440 {
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441 ngx_int_t rc;
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442 ngx_mail_pop3_srv_conf_t *pscf;
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443
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444 #if (NGX_MAIL_SSL)
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445 if (ngx_mail_starttls_only(s, c)) {
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446 return NGX_MAIL_PARSE_INVALID_COMMAND;
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447 }
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448 #endif
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449
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450 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
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451
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452 if (s->args.nelts == 0) {
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453 s->out = pscf->auth_capability;
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454 s->state = 0;
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455
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456 return NGX_OK;
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457 }
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458
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459 rc = ngx_mail_auth_parse(s, c);
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460
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461 switch (rc) {
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462
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463 case NGX_MAIL_AUTH_LOGIN:
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464
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570
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465 ngx_str_set(&s->out, pop3_username);
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336
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466 s->mail_state = ngx_pop3_auth_login_username;
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467
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468 return NGX_OK;
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469
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444
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470 case NGX_MAIL_AUTH_LOGIN_USERNAME:
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471
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570
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472 ngx_str_set(&s->out, pop3_password);
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444
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473 s->mail_state = ngx_pop3_auth_login_password;
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|
474
|
|
475 return ngx_mail_auth_login_username(s, c, 1);
|
|
476
|
336
|
477 case NGX_MAIL_AUTH_PLAIN:
|
|
478
|
570
|
479 ngx_str_set(&s->out, pop3_next);
|
336
|
480 s->mail_state = ngx_pop3_auth_plain;
|
|
481
|
|
482 return NGX_OK;
|
|
483
|
|
484 case NGX_MAIL_AUTH_CRAM_MD5:
|
|
485
|
|
486 if (!(pscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
|
|
487 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
488 }
|
|
489
|
|
490 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) {
|
|
491 s->mail_state = ngx_pop3_auth_cram_md5;
|
|
492 return NGX_OK;
|
|
493 }
|
|
494
|
|
495 return NGX_ERROR;
|
|
496 }
|
|
497
|
|
498 return rc;
|
|
499 }
|