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336
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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336
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11 #include <ngx_mail.h>
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12 #include <ngx_mail_imap_module.h>
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13
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14
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15 static ngx_int_t ngx_mail_imap_login(ngx_mail_session_t *s,
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16 ngx_connection_t *c);
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17 static ngx_int_t ngx_mail_imap_authenticate(ngx_mail_session_t *s,
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18 ngx_connection_t *c);
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19 static ngx_int_t ngx_mail_imap_capability(ngx_mail_session_t *s,
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20 ngx_connection_t *c);
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21 static ngx_int_t ngx_mail_imap_starttls(ngx_mail_session_t *s,
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22 ngx_connection_t *c);
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23
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24
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25 static u_char imap_greeting[] = "* OK IMAP4 ready" CRLF;
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26 static u_char imap_star[] = "* ";
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27 static u_char imap_ok[] = "OK completed" CRLF;
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28 static u_char imap_next[] = "+ OK" CRLF;
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29 static u_char imap_plain_next[] = "+ " CRLF;
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30 static u_char imap_username[] = "+ VXNlcm5hbWU6" CRLF;
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31 static u_char imap_password[] = "+ UGFzc3dvcmQ6" CRLF;
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32 static u_char imap_bye[] = "* BYE" CRLF;
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33 static u_char imap_invalid_command[] = "BAD invalid command" CRLF;
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34
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35
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36 void
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37 ngx_mail_imap_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
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38 {
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39 ngx_mail_core_srv_conf_t *cscf;
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40
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41 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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42
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570
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43 ngx_str_set(&s->out, imap_greeting);
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336
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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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430
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49 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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336
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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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570
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139 ngx_str_set(&s->out, imap_ok);
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336
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140
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141 if (rc == NGX_OK) {
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142
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143 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth command: %i",
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144 s->command);
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145
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146 if (s->backslash) {
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147
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148 arg = s->args.elts;
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149
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150 for (i = 0; i < s->args.nelts; i++) {
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151 dst = arg[i].data;
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152 end = dst + arg[i].len;
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153
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154 for (src = dst; src < end; dst++) {
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155 *dst = *src;
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156 if (*src++ == '\\') {
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157 *dst = *src++;
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158 }
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159 }
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160
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161 arg[i].len = dst - arg[i].data;
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162 }
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163
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164 s->backslash = 0;
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165 }
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166
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167 switch (s->mail_state) {
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168
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169 case ngx_imap_start:
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170
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171 switch (s->command) {
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172
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173 case NGX_IMAP_LOGIN:
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174 rc = ngx_mail_imap_login(s, c);
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175 break;
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176
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177 case NGX_IMAP_AUTHENTICATE:
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178 rc = ngx_mail_imap_authenticate(s, c);
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179 tag = (rc != NGX_OK);
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180 break;
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181
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182 case NGX_IMAP_CAPABILITY:
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183 rc = ngx_mail_imap_capability(s, c);
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184 break;
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185
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186 case NGX_IMAP_LOGOUT:
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187 s->quit = 1;
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570
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188 ngx_str_set(&s->text, imap_bye);
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336
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189 break;
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190
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191 case NGX_IMAP_NOOP:
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192 break;
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193
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194 case NGX_IMAP_STARTTLS:
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195 rc = ngx_mail_imap_starttls(s, c);
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196 break;
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197
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198 default:
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199 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
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200 break;
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201 }
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202
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203 break;
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204
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205 case ngx_imap_auth_login_username:
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444
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206 rc = ngx_mail_auth_login_username(s, c, 0);
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336
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207
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208 tag = 0;
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570
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209 ngx_str_set(&s->out, imap_password);
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336
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210 s->mail_state = ngx_imap_auth_login_password;
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211
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212 break;
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213
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214 case ngx_imap_auth_login_password:
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215 rc = ngx_mail_auth_login_password(s, c);
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216 break;
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217
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218 case ngx_imap_auth_plain:
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219 rc = ngx_mail_auth_plain(s, c, 0);
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220 break;
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221
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222 case ngx_imap_auth_cram_md5:
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223 rc = ngx_mail_auth_cram_md5(s, c);
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224 break;
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225 }
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226
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227 } else if (rc == NGX_IMAP_NEXT) {
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228 tag = 0;
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570
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229 ngx_str_set(&s->out, imap_next);
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336
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230 }
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231
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232 switch (rc) {
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233
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234 case NGX_DONE:
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235 ngx_mail_auth(s, c);
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236 return;
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237
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238 case NGX_ERROR:
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239 ngx_mail_session_internal_server_error(s);
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240 return;
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241
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242 case NGX_MAIL_PARSE_INVALID_COMMAND:
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243 s->state = 0;
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570
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244 ngx_str_set(&s->out, imap_invalid_command);
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336
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245 s->mail_state = ngx_imap_start;
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246 break;
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247 }
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248
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249 if (tag) {
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250 if (s->tag.len == 0) {
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570
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251 ngx_str_set(&s->tag, imap_star);
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336
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252 }
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253
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254 if (s->tagged_line.len < s->tag.len + s->text.len + s->out.len) {
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255 s->tagged_line.len = s->tag.len + s->text.len + s->out.len;
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382
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256 s->tagged_line.data = ngx_pnalloc(c->pool, s->tagged_line.len);
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336
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257 if (s->tagged_line.data == NULL) {
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258 ngx_mail_close_connection(c);
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259 return;
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260 }
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261 }
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262
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263 p = s->tagged_line.data;
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264
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265 if (s->text.len) {
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266 p = ngx_cpymem(p, s->text.data, s->text.len);
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267 }
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268
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269 p = ngx_cpymem(p, s->tag.data, s->tag.len);
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270 ngx_memcpy(p, s->out.data, s->out.len);
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271
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272 s->out.len = s->text.len + s->tag.len + s->out.len;
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273 s->out.data = s->tagged_line.data;
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274 }
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275
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276 if (rc != NGX_IMAP_NEXT) {
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277 s->args.nelts = 0;
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278
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279 if (s->state) {
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280 /* preserve tag */
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281 s->arg_start = s->buffer->start + s->tag.len;
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282 s->buffer->pos = s->arg_start;
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283 s->buffer->last = s->arg_start;
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284
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285 } else {
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286 s->buffer->pos = s->buffer->start;
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287 s->buffer->last = s->buffer->start;
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288 s->tag.len = 0;
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289 }
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290 }
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291
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292 ngx_mail_send(c->write);
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293 }
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294
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295
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296 static ngx_int_t
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297 ngx_mail_imap_login(ngx_mail_session_t *s, ngx_connection_t *c)
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298 {
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356
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299 ngx_str_t *arg;
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336
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300
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301 #if (NGX_MAIL_SSL)
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302 if (ngx_mail_starttls_only(s, c)) {
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303 return NGX_MAIL_PARSE_INVALID_COMMAND;
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304 }
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305 #endif
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306
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307 arg = s->args.elts;
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308
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309 if (s->args.nelts != 2 || arg[0].len == 0) {
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310 return NGX_MAIL_PARSE_INVALID_COMMAND;
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311 }
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312
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313 s->login.len = arg[0].len;
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382
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314 s->login.data = ngx_pnalloc(c->pool, s->login.len);
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336
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315 if (s->login.data == NULL) {
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316 return NGX_ERROR;
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317 }
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318
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319 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
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320
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321 s->passwd.len = arg[1].len;
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382
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322 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len);
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336
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323 if (s->passwd.data == NULL) {
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324 return NGX_ERROR;
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325 }
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326
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327 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len);
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328
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329 #if (NGX_DEBUG_MAIL_PASSWD)
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330 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
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331 "imap login:\"%V\" passwd:\"%V\"",
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332 &s->login, &s->passwd);
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333 #else
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334 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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335 "imap login:\"%V\"", &s->login);
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336 #endif
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337
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338 return NGX_DONE;
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339 }
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340
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341
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342 static ngx_int_t
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343 ngx_mail_imap_authenticate(ngx_mail_session_t *s, ngx_connection_t *c)
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344 {
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345 ngx_int_t rc;
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346 ngx_mail_core_srv_conf_t *cscf;
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347 ngx_mail_imap_srv_conf_t *iscf;
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348
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349 #if (NGX_MAIL_SSL)
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350 if (ngx_mail_starttls_only(s, c)) {
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351 return NGX_MAIL_PARSE_INVALID_COMMAND;
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352 }
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353 #endif
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354
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355 rc = ngx_mail_auth_parse(s, c);
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356
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357 switch (rc) {
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358
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359 case NGX_MAIL_AUTH_LOGIN:
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360
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570
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361 ngx_str_set(&s->out, imap_username);
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336
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362 s->mail_state = ngx_imap_auth_login_username;
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363
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364 return NGX_OK;
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365
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444
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366 case NGX_MAIL_AUTH_LOGIN_USERNAME:
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367
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570
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368 ngx_str_set(&s->out, imap_password);
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444
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369 s->mail_state = ngx_imap_auth_login_password;
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370
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371 return ngx_mail_auth_login_username(s, c, 1);
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372
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336
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373 case NGX_MAIL_AUTH_PLAIN:
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374
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570
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375 ngx_str_set(&s->out, imap_plain_next);
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336
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376 s->mail_state = ngx_imap_auth_plain;
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377
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378 return NGX_OK;
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379
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380 case NGX_MAIL_AUTH_CRAM_MD5:
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381
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382 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
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383
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384 if (!(iscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
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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 if (s->salt.data == NULL) {
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389 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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390
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391 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
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392 return NGX_ERROR;
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393 }
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394 }
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395
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396 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) {
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397 s->mail_state = ngx_imap_auth_cram_md5;
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398 return NGX_OK;
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399 }
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400
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401 return NGX_ERROR;
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402 }
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403
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404 return rc;
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405 }
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406
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407
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408 static ngx_int_t
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409 ngx_mail_imap_capability(ngx_mail_session_t *s, ngx_connection_t *c)
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410 {
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411 ngx_mail_imap_srv_conf_t *iscf;
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412
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413 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
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414
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415 #if (NGX_MAIL_SSL)
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416
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417 if (c->ssl == NULL) {
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356
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418 ngx_mail_ssl_conf_t *sslcf;
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419
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336
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420 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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421
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422 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
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423 s->text = iscf->starttls_capability;
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424 return NGX_OK;
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425 }
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426
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427 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
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428 s->text = iscf->starttls_only_capability;
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429 return NGX_OK;
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430 }
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431 }
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432 #endif
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433
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434 s->text = iscf->capability;
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435
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436 return NGX_OK;
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437 }
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438
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439
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440 static ngx_int_t
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441 ngx_mail_imap_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
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442 {
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443 #if (NGX_MAIL_SSL)
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444 ngx_mail_ssl_conf_t *sslcf;
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445
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446 if (c->ssl == NULL) {
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447 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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448 if (sslcf->starttls) {
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449 c->read->handler = ngx_mail_starttls_handler;
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450 return NGX_OK;
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451 }
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452 }
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453
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454 #endif
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455
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456 return NGX_MAIL_PARSE_INVALID_COMMAND;
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457 }
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