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_imap_module.h>
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12
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13
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14 static ngx_int_t ngx_mail_imap_login(ngx_mail_session_t *s,
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15 ngx_connection_t *c);
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16 static ngx_int_t ngx_mail_imap_authenticate(ngx_mail_session_t *s,
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17 ngx_connection_t *c);
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18 static ngx_int_t ngx_mail_imap_capability(ngx_mail_session_t *s,
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19 ngx_connection_t *c);
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20 static ngx_int_t ngx_mail_imap_starttls(ngx_mail_session_t *s,
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21 ngx_connection_t *c);
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22
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23
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24 static u_char imap_greeting[] = "* OK IMAP4 ready" CRLF;
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25 static u_char imap_star[] = "* ";
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26 static u_char imap_ok[] = "OK completed" CRLF;
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27 static u_char imap_next[] = "+ OK" CRLF;
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28 static u_char imap_plain_next[] = "+ " CRLF;
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29 static u_char imap_username[] = "+ VXNlcm5hbWU6" CRLF;
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30 static u_char imap_password[] = "+ UGFzc3dvcmQ6" CRLF;
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31 static u_char imap_bye[] = "* BYE" CRLF;
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32 static u_char imap_invalid_command[] = "BAD invalid command" CRLF;
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33
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34
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35 void
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36 ngx_mail_imap_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
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37 {
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38 ngx_mail_core_srv_conf_t *cscf;
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39
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40 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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41
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42 s->out.len = sizeof(imap_greeting) - 1;
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43 s->out.data = imap_greeting;
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44
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45 c->read->handler = ngx_mail_imap_init_protocol;
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46
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47 ngx_add_timer(c->read, cscf->timeout);
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48
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49 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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50 ngx_mail_close_connection(c);
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51 }
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52
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53 ngx_mail_send(c->write);
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54 }
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55
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56
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57 void
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58 ngx_mail_imap_init_protocol(ngx_event_t *rev)
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59 {
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60 ngx_connection_t *c;
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61 ngx_mail_session_t *s;
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62 ngx_mail_imap_srv_conf_t *iscf;
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63
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64 c = rev->data;
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65
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66 c->log->action = "in auth state";
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67
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68 if (rev->timedout) {
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69 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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70 c->timedout = 1;
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71 ngx_mail_close_connection(c);
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72 return;
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73 }
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74
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75 s = c->data;
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76
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77 if (s->buffer == NULL) {
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78 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t))
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79 == NGX_ERROR)
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80 {
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81 ngx_mail_session_internal_server_error(s);
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82 return;
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83 }
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84
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85 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
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86
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87 s->buffer = ngx_create_temp_buf(c->pool, iscf->client_buffer_size);
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88 if (s->buffer == NULL) {
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89 ngx_mail_session_internal_server_error(s);
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90 return;
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91 }
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92 }
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93
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94 s->mail_state = ngx_imap_start;
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95 c->read->handler = ngx_mail_imap_auth_state;
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96
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97 ngx_mail_imap_auth_state(rev);
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98 }
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99
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100
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101 void
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102 ngx_mail_imap_auth_state(ngx_event_t *rev)
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103 {
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104 u_char *p, *dst, *src, *end;
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105 ngx_str_t *arg;
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106 ngx_int_t rc;
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107 ngx_uint_t tag, i;
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108 ngx_connection_t *c;
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109 ngx_mail_session_t *s;
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110
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111 c = rev->data;
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112 s = c->data;
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113
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114 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth state");
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115
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116 if (rev->timedout) {
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117 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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118 c->timedout = 1;
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119 ngx_mail_close_connection(c);
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120 return;
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121 }
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122
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123 if (s->out.len) {
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124 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap send handler busy");
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125 s->blocked = 1;
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126 return;
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127 }
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128
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129 s->blocked = 0;
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130
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131 rc = ngx_mail_read_command(s, c);
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132
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133 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
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134 return;
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135 }
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136
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137 tag = 1;
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138 s->text.len = 0;
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139 s->out.len = sizeof(imap_ok) - 1;
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140 s->out.data = imap_ok;
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141
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142 if (rc == NGX_OK) {
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143
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144 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth command: %i",
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145 s->command);
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146
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147 if (s->backslash) {
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148
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149 arg = s->args.elts;
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150
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151 for (i = 0; i < s->args.nelts; i++) {
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152 dst = arg[i].data;
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153 end = dst + arg[i].len;
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154
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155 for (src = dst; src < end; dst++) {
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156 *dst = *src;
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157 if (*src++ == '\\') {
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158 *dst = *src++;
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159 }
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160 }
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161
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162 arg[i].len = dst - arg[i].data;
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163 }
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164
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165 s->backslash = 0;
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166 }
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167
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168 switch (s->mail_state) {
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169
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170 case ngx_imap_start:
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171
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172 switch (s->command) {
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173
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174 case NGX_IMAP_LOGIN:
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175 rc = ngx_mail_imap_login(s, c);
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176 break;
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177
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178 case NGX_IMAP_AUTHENTICATE:
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179 rc = ngx_mail_imap_authenticate(s, c);
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180 tag = (rc != NGX_OK);
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181 break;
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182
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183 case NGX_IMAP_CAPABILITY:
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184 rc = ngx_mail_imap_capability(s, c);
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185 break;
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186
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187 case NGX_IMAP_LOGOUT:
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188 s->quit = 1;
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189 s->text.len = sizeof(imap_bye) - 1;
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190 s->text.data = imap_bye;
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191 break;
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192
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193 case NGX_IMAP_NOOP:
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194 break;
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195
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196 case NGX_IMAP_STARTTLS:
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197 rc = ngx_mail_imap_starttls(s, c);
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198 break;
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199
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200 default:
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201 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
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202 break;
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203 }
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204
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205 break;
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206
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207 case ngx_imap_auth_login_username:
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208 rc = ngx_mail_auth_login_username(s, c);
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209
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210 tag = 0;
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211 s->out.len = sizeof(imap_password) - 1;
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212 s->out.data = imap_password;
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213 s->mail_state = ngx_imap_auth_login_password;
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214
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215 break;
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216
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217 case ngx_imap_auth_login_password:
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218 rc = ngx_mail_auth_login_password(s, c);
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219 break;
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220
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221 case ngx_imap_auth_plain:
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222 rc = ngx_mail_auth_plain(s, c, 0);
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223 break;
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224
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225 case ngx_imap_auth_cram_md5:
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226 rc = ngx_mail_auth_cram_md5(s, c);
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227 break;
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228 }
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229
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230 } else if (rc == NGX_IMAP_NEXT) {
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231 tag = 0;
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232 s->out.len = sizeof(imap_next) - 1;
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233 s->out.data = imap_next;
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234 }
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235
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236 switch (rc) {
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237
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238 case NGX_DONE:
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239 ngx_mail_auth(s, c);
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240 return;
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241
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242 case NGX_ERROR:
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243 ngx_mail_session_internal_server_error(s);
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244 return;
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245
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246 case NGX_MAIL_PARSE_INVALID_COMMAND:
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247 s->state = 0;
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248 s->out.len = sizeof(imap_invalid_command) - 1;
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249 s->out.data = imap_invalid_command;
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250 s->mail_state = ngx_imap_start;
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251 break;
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252 }
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253
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254 if (tag) {
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255 if (s->tag.len == 0) {
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256 s->tag.len = sizeof(imap_star) - 1;
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257 s->tag.data = (u_char *) imap_star;
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258 }
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259
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260 if (s->tagged_line.len < s->tag.len + s->text.len + s->out.len) {
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261 s->tagged_line.len = s->tag.len + s->text.len + s->out.len;
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262 s->tagged_line.data = ngx_palloc(c->pool, s->tagged_line.len);
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263 if (s->tagged_line.data == NULL) {
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264 ngx_mail_close_connection(c);
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265 return;
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266 }
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267 }
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268
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269 p = s->tagged_line.data;
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270
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271 if (s->text.len) {
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272 p = ngx_cpymem(p, s->text.data, s->text.len);
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273 }
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274
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275 p = ngx_cpymem(p, s->tag.data, s->tag.len);
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276 ngx_memcpy(p, s->out.data, s->out.len);
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277
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278 s->out.len = s->text.len + s->tag.len + s->out.len;
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279 s->out.data = s->tagged_line.data;
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280 }
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281
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282 if (rc != NGX_IMAP_NEXT) {
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283 s->args.nelts = 0;
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284
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285 if (s->state) {
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286 /* preserve tag */
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287 s->arg_start = s->buffer->start + s->tag.len;
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288 s->buffer->pos = s->arg_start;
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289 s->buffer->last = s->arg_start;
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290
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291 } else {
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292 s->buffer->pos = s->buffer->start;
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293 s->buffer->last = s->buffer->start;
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294 s->tag.len = 0;
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295 }
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296 }
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297
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298 ngx_mail_send(c->write);
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299 }
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300
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301
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302 static ngx_int_t
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303 ngx_mail_imap_login(ngx_mail_session_t *s, ngx_connection_t *c)
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304 {
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305 ngx_str_t *arg;
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306
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307 #if (NGX_MAIL_SSL)
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308 if (ngx_mail_starttls_only(s, c)) {
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309 return NGX_MAIL_PARSE_INVALID_COMMAND;
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310 }
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311 #endif
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312
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313 arg = s->args.elts;
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314
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315 if (s->args.nelts != 2 || arg[0].len == 0) {
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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 s->login.len = arg[0].len;
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320 s->login.data = ngx_palloc(c->pool, s->login.len);
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321 if (s->login.data == NULL) {
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322 return NGX_ERROR;
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323 }
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324
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325 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
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326
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327 s->passwd.len = arg[1].len;
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328 s->passwd.data = ngx_palloc(c->pool, s->passwd.len);
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329 if (s->passwd.data == NULL) {
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330 return NGX_ERROR;
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331 }
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332
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333 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len);
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334
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335 #if (NGX_DEBUG_MAIL_PASSWD)
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336 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
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337 "imap login:\"%V\" passwd:\"%V\"",
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338 &s->login, &s->passwd);
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339 #else
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340 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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341 "imap login:\"%V\"", &s->login);
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342 #endif
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343
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344 return NGX_DONE;
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345 }
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346
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347
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348 static ngx_int_t
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349 ngx_mail_imap_authenticate(ngx_mail_session_t *s, ngx_connection_t *c)
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350 {
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351 ngx_int_t rc;
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352 ngx_mail_core_srv_conf_t *cscf;
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353 ngx_mail_imap_srv_conf_t *iscf;
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354
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355 #if (NGX_MAIL_SSL)
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356 if (ngx_mail_starttls_only(s, c)) {
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357 return NGX_MAIL_PARSE_INVALID_COMMAND;
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358 }
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359 #endif
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360
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361 rc = ngx_mail_auth_parse(s, c);
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362
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363 switch (rc) {
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364
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365 case NGX_MAIL_AUTH_LOGIN:
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366
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367 s->out.len = sizeof(imap_username) - 1;
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368 s->out.data = imap_username;
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369 s->mail_state = ngx_imap_auth_login_username;
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370
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371 return NGX_OK;
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372
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373 case NGX_MAIL_AUTH_PLAIN:
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374
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375 s->out.len = sizeof(imap_plain_next) - 1;
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376 s->out.data = imap_plain_next;
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377 s->mail_state = ngx_imap_auth_plain;
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378
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379 return NGX_OK;
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380
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381 case NGX_MAIL_AUTH_CRAM_MD5:
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382
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383 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
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384
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385 if (!(iscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
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386 return NGX_MAIL_PARSE_INVALID_COMMAND;
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387 }
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388
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389 if (s->salt.data == NULL) {
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390 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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391
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392 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
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393 return NGX_ERROR;
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394 }
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395 }
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396
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397 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) {
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398 s->mail_state = ngx_imap_auth_cram_md5;
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399 return NGX_OK;
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400 }
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401
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402 return NGX_ERROR;
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403 }
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404
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405 return rc;
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406 }
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407
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408
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409 static ngx_int_t
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410 ngx_mail_imap_capability(ngx_mail_session_t *s, ngx_connection_t *c)
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411 {
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412 ngx_mail_imap_srv_conf_t *iscf;
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413 #if (NGX_MAIL_SSL)
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414 ngx_mail_ssl_conf_t *sslcf;
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415 #endif
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416
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417 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
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418
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419 #if (NGX_MAIL_SSL)
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420
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421 if (c->ssl == NULL) {
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422 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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423
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424 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
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425 s->text = iscf->starttls_capability;
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426 return NGX_OK;
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427 }
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428
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429 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
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430 s->text = iscf->starttls_only_capability;
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431 return NGX_OK;
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432 }
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433 }
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434 #endif
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435
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436 s->text = iscf->capability;
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437
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438 return NGX_OK;
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439 }
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440
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441
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442 static ngx_int_t
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443 ngx_mail_imap_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
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444 {
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445 #if (NGX_MAIL_SSL)
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446 ngx_mail_ssl_conf_t *sslcf;
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447
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448 if (c->ssl == NULL) {
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449 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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450 if (sslcf->starttls) {
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451 c->read->handler = ngx_mail_starttls_handler;
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452 return NGX_OK;
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453 }
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454 }
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455
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456 #endif
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457
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458 return NGX_MAIL_PARSE_INVALID_COMMAND;
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459 }
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