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336
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10 #include <ngx_mail.h>
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11 #include <ngx_mail_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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570
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42 ngx_str_set(&s->out, imap_greeting);
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336
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43
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44 c->read->handler = ngx_mail_imap_init_protocol;
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45
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46 ngx_add_timer(c->read, cscf->timeout);
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47
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430
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48 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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336
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49 ngx_mail_close_connection(c);
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50 }
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51
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52 ngx_mail_send(c->write);
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53 }
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54
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55
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56 void
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57 ngx_mail_imap_init_protocol(ngx_event_t *rev)
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58 {
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59 ngx_connection_t *c;
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60 ngx_mail_session_t *s;
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61 ngx_mail_imap_srv_conf_t *iscf;
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62
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63 c = rev->data;
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64
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65 c->log->action = "in auth state";
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66
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67 if (rev->timedout) {
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68 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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69 c->timedout = 1;
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70 ngx_mail_close_connection(c);
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71 return;
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72 }
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73
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74 s = c->data;
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75
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76 if (s->buffer == NULL) {
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77 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t))
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78 == NGX_ERROR)
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79 {
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80 ngx_mail_session_internal_server_error(s);
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81 return;
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82 }
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83
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84 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
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85
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86 s->buffer = ngx_create_temp_buf(c->pool, iscf->client_buffer_size);
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87 if (s->buffer == NULL) {
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88 ngx_mail_session_internal_server_error(s);
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89 return;
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90 }
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91 }
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92
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93 s->mail_state = ngx_imap_start;
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94 c->read->handler = ngx_mail_imap_auth_state;
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95
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96 ngx_mail_imap_auth_state(rev);
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97 }
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98
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99
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100 void
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101 ngx_mail_imap_auth_state(ngx_event_t *rev)
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102 {
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103 u_char *p, *dst, *src, *end;
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104 ngx_str_t *arg;
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105 ngx_int_t rc;
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106 ngx_uint_t tag, i;
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107 ngx_connection_t *c;
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108 ngx_mail_session_t *s;
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109
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110 c = rev->data;
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111 s = c->data;
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112
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113 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth state");
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114
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115 if (rev->timedout) {
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116 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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117 c->timedout = 1;
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118 ngx_mail_close_connection(c);
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119 return;
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120 }
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121
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122 if (s->out.len) {
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123 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap send handler busy");
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124 s->blocked = 1;
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125 return;
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126 }
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127
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128 s->blocked = 0;
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129
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130 rc = ngx_mail_read_command(s, c);
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131
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132 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
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133 return;
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134 }
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135
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136 tag = 1;
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137 s->text.len = 0;
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570
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138 ngx_str_set(&s->out, imap_ok);
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336
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139
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140 if (rc == NGX_OK) {
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141
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142 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth command: %i",
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143 s->command);
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144
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145 if (s->backslash) {
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146
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147 arg = s->args.elts;
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148
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149 for (i = 0; i < s->args.nelts; i++) {
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150 dst = arg[i].data;
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151 end = dst + arg[i].len;
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152
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153 for (src = dst; src < end; dst++) {
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154 *dst = *src;
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155 if (*src++ == '\\') {
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156 *dst = *src++;
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157 }
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158 }
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159
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160 arg[i].len = dst - arg[i].data;
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161 }
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162
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163 s->backslash = 0;
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164 }
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165
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166 switch (s->mail_state) {
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167
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168 case ngx_imap_start:
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169
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170 switch (s->command) {
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171
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172 case NGX_IMAP_LOGIN:
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173 rc = ngx_mail_imap_login(s, c);
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174 break;
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175
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176 case NGX_IMAP_AUTHENTICATE:
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177 rc = ngx_mail_imap_authenticate(s, c);
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178 tag = (rc != NGX_OK);
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179 break;
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180
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181 case NGX_IMAP_CAPABILITY:
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182 rc = ngx_mail_imap_capability(s, c);
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183 break;
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184
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185 case NGX_IMAP_LOGOUT:
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186 s->quit = 1;
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570
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187 ngx_str_set(&s->text, imap_bye);
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336
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188 break;
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189
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190 case NGX_IMAP_NOOP:
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191 break;
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192
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193 case NGX_IMAP_STARTTLS:
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194 rc = ngx_mail_imap_starttls(s, c);
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195 break;
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196
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197 default:
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198 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
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199 break;
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200 }
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201
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202 break;
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203
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204 case ngx_imap_auth_login_username:
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444
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205 rc = ngx_mail_auth_login_username(s, c, 0);
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336
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206
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207 tag = 0;
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570
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208 ngx_str_set(&s->out, imap_password);
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336
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209 s->mail_state = ngx_imap_auth_login_password;
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210
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211 break;
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212
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213 case ngx_imap_auth_login_password:
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214 rc = ngx_mail_auth_login_password(s, c);
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215 break;
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216
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217 case ngx_imap_auth_plain:
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218 rc = ngx_mail_auth_plain(s, c, 0);
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219 break;
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220
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221 case ngx_imap_auth_cram_md5:
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222 rc = ngx_mail_auth_cram_md5(s, c);
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223 break;
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224 }
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225
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226 } else if (rc == NGX_IMAP_NEXT) {
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227 tag = 0;
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570
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228 ngx_str_set(&s->out, imap_next);
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336
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229 }
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230
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231 switch (rc) {
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232
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233 case NGX_DONE:
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234 ngx_mail_auth(s, c);
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235 return;
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236
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237 case NGX_ERROR:
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238 ngx_mail_session_internal_server_error(s);
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239 return;
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240
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241 case NGX_MAIL_PARSE_INVALID_COMMAND:
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242 s->state = 0;
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570
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243 ngx_str_set(&s->out, imap_invalid_command);
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336
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244 s->mail_state = ngx_imap_start;
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245 break;
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246 }
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247
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248 if (tag) {
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249 if (s->tag.len == 0) {
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570
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250 ngx_str_set(&s->tag, imap_star);
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336
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251 }
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252
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253 if (s->tagged_line.len < s->tag.len + s->text.len + s->out.len) {
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254 s->tagged_line.len = s->tag.len + s->text.len + s->out.len;
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382
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255 s->tagged_line.data = ngx_pnalloc(c->pool, s->tagged_line.len);
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336
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256 if (s->tagged_line.data == NULL) {
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257 ngx_mail_close_connection(c);
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258 return;
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259 }
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260 }
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261
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262 p = s->tagged_line.data;
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263
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264 if (s->text.len) {
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265 p = ngx_cpymem(p, s->text.data, s->text.len);
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266 }
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267
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268 p = ngx_cpymem(p, s->tag.data, s->tag.len);
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269 ngx_memcpy(p, s->out.data, s->out.len);
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270
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271 s->out.len = s->text.len + s->tag.len + s->out.len;
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272 s->out.data = s->tagged_line.data;
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273 }
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274
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275 if (rc != NGX_IMAP_NEXT) {
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276 s->args.nelts = 0;
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277
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278 if (s->state) {
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279 /* preserve tag */
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280 s->arg_start = s->buffer->start + s->tag.len;
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281 s->buffer->pos = s->arg_start;
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282 s->buffer->last = s->arg_start;
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283
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284 } else {
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285 s->buffer->pos = s->buffer->start;
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286 s->buffer->last = s->buffer->start;
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287 s->tag.len = 0;
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288 }
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289 }
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290
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291 ngx_mail_send(c->write);
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292 }
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293
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294
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295 static ngx_int_t
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296 ngx_mail_imap_login(ngx_mail_session_t *s, ngx_connection_t *c)
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297 {
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356
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298 ngx_str_t *arg;
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336
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299
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300 #if (NGX_MAIL_SSL)
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301 if (ngx_mail_starttls_only(s, c)) {
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302 return NGX_MAIL_PARSE_INVALID_COMMAND;
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303 }
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304 #endif
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305
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306 arg = s->args.elts;
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307
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308 if (s->args.nelts != 2 || arg[0].len == 0) {
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309 return NGX_MAIL_PARSE_INVALID_COMMAND;
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310 }
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311
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312 s->login.len = arg[0].len;
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382
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313 s->login.data = ngx_pnalloc(c->pool, s->login.len);
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336
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314 if (s->login.data == NULL) {
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315 return NGX_ERROR;
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316 }
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317
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318 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
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319
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320 s->passwd.len = arg[1].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[1].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_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
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330 "imap login:\"%V\" passwd:\"%V\"",
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331 &s->login, &s->passwd);
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332 #else
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333 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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334 "imap login:\"%V\"", &s->login);
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335 #endif
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336
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337 return NGX_DONE;
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338 }
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339
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340
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341 static ngx_int_t
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342 ngx_mail_imap_authenticate(ngx_mail_session_t *s, ngx_connection_t *c)
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343 {
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344 ngx_int_t rc;
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345 ngx_mail_core_srv_conf_t *cscf;
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346 ngx_mail_imap_srv_conf_t *iscf;
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347
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348 #if (NGX_MAIL_SSL)
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349 if (ngx_mail_starttls_only(s, c)) {
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350 return NGX_MAIL_PARSE_INVALID_COMMAND;
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351 }
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352 #endif
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353
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354 rc = ngx_mail_auth_parse(s, c);
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355
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356 switch (rc) {
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357
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358 case NGX_MAIL_AUTH_LOGIN:
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359
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570
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360 ngx_str_set(&s->out, imap_username);
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336
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361 s->mail_state = ngx_imap_auth_login_username;
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362
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363 return NGX_OK;
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364
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444
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365 case NGX_MAIL_AUTH_LOGIN_USERNAME:
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366
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570
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367 ngx_str_set(&s->out, imap_password);
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444
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368 s->mail_state = ngx_imap_auth_login_password;
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369
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370 return ngx_mail_auth_login_username(s, c, 1);
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371
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336
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372 case NGX_MAIL_AUTH_PLAIN:
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373
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570
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374 ngx_str_set(&s->out, imap_plain_next);
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336
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375 s->mail_state = ngx_imap_auth_plain;
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376
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377 return NGX_OK;
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378
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379 case NGX_MAIL_AUTH_CRAM_MD5:
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380
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381 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
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382
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383 if (!(iscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
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384 return NGX_MAIL_PARSE_INVALID_COMMAND;
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385 }
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386
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387 if (s->salt.data == NULL) {
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388 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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389
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390 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
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391 return NGX_ERROR;
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392 }
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393 }
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394
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395 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) {
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396 s->mail_state = ngx_imap_auth_cram_md5;
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397 return NGX_OK;
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398 }
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399
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400 return NGX_ERROR;
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401 }
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402
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403 return rc;
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404 }
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405
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406
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407 static ngx_int_t
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408 ngx_mail_imap_capability(ngx_mail_session_t *s, ngx_connection_t *c)
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409 {
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410 ngx_mail_imap_srv_conf_t *iscf;
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411
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412 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
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413
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414 #if (NGX_MAIL_SSL)
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415
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416 if (c->ssl == NULL) {
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356
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417 ngx_mail_ssl_conf_t *sslcf;
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418
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336
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419 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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420
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421 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
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422 s->text = iscf->starttls_capability;
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423 return NGX_OK;
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424 }
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425
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426 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
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427 s->text = iscf->starttls_only_capability;
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428 return NGX_OK;
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429 }
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430 }
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431 #endif
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432
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433 s->text = iscf->capability;
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434
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435 return NGX_OK;
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436 }
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437
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438
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439 static ngx_int_t
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440 ngx_mail_imap_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
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441 {
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442 #if (NGX_MAIL_SSL)
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443 ngx_mail_ssl_conf_t *sslcf;
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444
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445 if (c->ssl == NULL) {
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446 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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447 if (sslcf->starttls) {
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448 c->read->handler = ngx_mail_starttls_handler;
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449 return NGX_OK;
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450 }
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451 }
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452
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453 #endif
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454
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455 return NGX_MAIL_PARSE_INVALID_COMMAND;
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456 }
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