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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_pop3_module.h>
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13
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14
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15 static ngx_int_t ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c);
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16 static ngx_int_t ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c);
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17 static ngx_int_t ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c,
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18 ngx_int_t stls);
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19 static ngx_int_t ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c);
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20 static ngx_int_t ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c);
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21 static ngx_int_t ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c);
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22
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23
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24 static u_char pop3_greeting[] = "+OK POP3 ready" CRLF;
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25 static u_char pop3_ok[] = "+OK" CRLF;
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26 static u_char pop3_next[] = "+ " CRLF;
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27 static u_char pop3_username[] = "+ VXNlcm5hbWU6" CRLF;
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28 static u_char pop3_password[] = "+ UGFzc3dvcmQ6" CRLF;
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29 static u_char pop3_invalid_command[] = "-ERR invalid command" CRLF;
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30
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31
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32 void
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33 ngx_mail_pop3_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
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34 {
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35 u_char *p;
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36 ngx_mail_core_srv_conf_t *cscf;
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37 ngx_mail_pop3_srv_conf_t *pscf;
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38
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39 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
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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 if (pscf->auth_methods
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43 & (NGX_MAIL_AUTH_APOP_ENABLED|NGX_MAIL_AUTH_CRAM_MD5_ENABLED))
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44 {
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45 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
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46 ngx_mail_session_internal_server_error(s);
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47 return;
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48 }
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49
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382
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50 s->out.data = ngx_pnalloc(c->pool, sizeof(pop3_greeting) + s->salt.len);
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336
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51 if (s->out.data == NULL) {
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52 ngx_mail_session_internal_server_error(s);
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53 return;
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54 }
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55
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56 p = ngx_cpymem(s->out.data, pop3_greeting, sizeof(pop3_greeting) - 3);
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57 *p++ = ' ';
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58 p = ngx_cpymem(p, s->salt.data, s->salt.len);
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59
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60 s->out.len = p - s->out.data;
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61
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62 } else {
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570
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63 ngx_str_set(&s->out, pop3_greeting);
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336
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64 }
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65
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66 c->read->handler = ngx_mail_pop3_init_protocol;
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67
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68 ngx_add_timer(c->read, cscf->timeout);
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69
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430
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70 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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336
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71 ngx_mail_close_connection(c);
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72 }
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73
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74 ngx_mail_send(c->write);
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75 }
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76
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77
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78 void
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79 ngx_mail_pop3_init_protocol(ngx_event_t *rev)
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80 {
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81 ngx_connection_t *c;
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82 ngx_mail_session_t *s;
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83
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84 c = rev->data;
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85
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86 c->log->action = "in auth state";
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87
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88 if (rev->timedout) {
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89 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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90 c->timedout = 1;
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91 ngx_mail_close_connection(c);
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92 return;
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93 }
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94
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95 s = c->data;
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96
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97 if (s->buffer == NULL) {
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98 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t))
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99 == NGX_ERROR)
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100 {
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101 ngx_mail_session_internal_server_error(s);
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102 return;
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103 }
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104
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105 s->buffer = ngx_create_temp_buf(c->pool, 128);
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106 if (s->buffer == NULL) {
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107 ngx_mail_session_internal_server_error(s);
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108 return;
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109 }
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110 }
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111
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112 s->mail_state = ngx_pop3_start;
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113 c->read->handler = ngx_mail_pop3_auth_state;
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114
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115 ngx_mail_pop3_auth_state(rev);
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116 }
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117
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118
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119 void
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120 ngx_mail_pop3_auth_state(ngx_event_t *rev)
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121 {
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122 ngx_int_t rc;
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123 ngx_connection_t *c;
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124 ngx_mail_session_t *s;
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125
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126 c = rev->data;
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127 s = c->data;
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128
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129 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 auth state");
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130
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131 if (rev->timedout) {
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132 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
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133 c->timedout = 1;
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134 ngx_mail_close_connection(c);
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135 return;
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136 }
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137
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138 if (s->out.len) {
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139 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 send handler busy");
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140 s->blocked = 1;
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141 return;
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142 }
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143
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144 s->blocked = 0;
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145
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146 rc = ngx_mail_read_command(s, c);
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147
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148 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
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149 return;
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150 }
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151
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570
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152 ngx_str_set(&s->out, pop3_ok);
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336
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153
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154 if (rc == NGX_OK) {
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155 switch (s->mail_state) {
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156
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157 case ngx_pop3_start:
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158
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159 switch (s->command) {
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160
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161 case NGX_POP3_USER:
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162 rc = ngx_mail_pop3_user(s, c);
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163 break;
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164
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165 case NGX_POP3_CAPA:
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166 rc = ngx_mail_pop3_capa(s, c, 1);
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167 break;
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168
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169 case NGX_POP3_APOP:
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170 rc = ngx_mail_pop3_apop(s, c);
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171 break;
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172
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173 case NGX_POP3_AUTH:
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174 rc = ngx_mail_pop3_auth(s, c);
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175 break;
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176
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177 case NGX_POP3_QUIT:
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178 s->quit = 1;
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179 break;
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180
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181 case NGX_POP3_NOOP:
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182 break;
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183
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184 case NGX_POP3_STLS:
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185 rc = ngx_mail_pop3_stls(s, c);
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186 break;
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187
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188 default:
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189 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
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190 break;
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191 }
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192
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193 break;
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194
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195 case ngx_pop3_user:
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196
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197 switch (s->command) {
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198
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199 case NGX_POP3_PASS:
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200 rc = ngx_mail_pop3_pass(s, c);
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201 break;
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202
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203 case NGX_POP3_CAPA:
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204 rc = ngx_mail_pop3_capa(s, c, 0);
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205 break;
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206
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207 case NGX_POP3_QUIT:
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208 s->quit = 1;
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209 break;
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210
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211 case NGX_POP3_NOOP:
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212 break;
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213
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214 default:
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215 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
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216 break;
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217 }
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218
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219 break;
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220
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664
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221 /* suppress warnings */
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336
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222 case ngx_pop3_passwd:
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223 break;
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224
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225 case ngx_pop3_auth_login_username:
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444
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226 rc = ngx_mail_auth_login_username(s, c, 0);
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336
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227
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570
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228 ngx_str_set(&s->out, pop3_password);
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336
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229 s->mail_state = ngx_pop3_auth_login_password;
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230 break;
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231
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232 case ngx_pop3_auth_login_password:
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233 rc = ngx_mail_auth_login_password(s, c);
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234 break;
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235
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236 case ngx_pop3_auth_plain:
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237 rc = ngx_mail_auth_plain(s, c, 0);
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238 break;
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239
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240 case ngx_pop3_auth_cram_md5:
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241 rc = ngx_mail_auth_cram_md5(s, c);
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242 break;
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243 }
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244 }
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245
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246 switch (rc) {
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247
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248 case NGX_DONE:
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249 ngx_mail_auth(s, c);
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250 return;
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251
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252 case NGX_ERROR:
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253 ngx_mail_session_internal_server_error(s);
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254 return;
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255
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256 case NGX_MAIL_PARSE_INVALID_COMMAND:
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257 s->mail_state = ngx_pop3_start;
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258 s->state = 0;
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259
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570
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260 ngx_str_set(&s->out, pop3_invalid_command);
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336
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261
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262 /* fall through */
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263
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264 case NGX_OK:
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265
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266 s->args.nelts = 0;
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267 s->buffer->pos = s->buffer->start;
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268 s->buffer->last = s->buffer->start;
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269
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270 if (s->state) {
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271 s->arg_start = s->buffer->start;
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272 }
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273
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274 ngx_mail_send(c->write);
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275 }
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276 }
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277
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278 static ngx_int_t
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279 ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c)
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280 {
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356
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281 ngx_str_t *arg;
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336
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282
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283 #if (NGX_MAIL_SSL)
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284 if (ngx_mail_starttls_only(s, c)) {
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285 return NGX_MAIL_PARSE_INVALID_COMMAND;
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286 }
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287 #endif
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288
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289 if (s->args.nelts != 1) {
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290 return NGX_MAIL_PARSE_INVALID_COMMAND;
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291 }
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292
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293 arg = s->args.elts;
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294 s->login.len = arg[0].len;
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382
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295 s->login.data = ngx_pnalloc(c->pool, s->login.len);
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336
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296 if (s->login.data == NULL) {
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297 return NGX_ERROR;
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298 }
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299
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300 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
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301
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302 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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303 "pop3 login: \"%V\"", &s->login);
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304
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305 s->mail_state = ngx_pop3_user;
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306
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307 return NGX_OK;
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308 }
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309
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310
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311 static ngx_int_t
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312 ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c)
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313 {
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314 ngx_str_t *arg;
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315
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316 if (s->args.nelts != 1) {
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317 return NGX_MAIL_PARSE_INVALID_COMMAND;
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318 }
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319
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320 arg = s->args.elts;
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321 s->passwd.len = arg[0].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[0].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_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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331 "pop3 passwd: \"%V\"", &s->passwd);
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332 #endif
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333
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334 return NGX_DONE;
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335 }
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336
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337
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338 static ngx_int_t
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339 ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, ngx_int_t stls)
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340 {
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341 ngx_mail_pop3_srv_conf_t *pscf;
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342
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343 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
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344
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345 #if (NGX_MAIL_SSL)
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346
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347 if (stls && c->ssl == NULL) {
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356
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348 ngx_mail_ssl_conf_t *sslcf;
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349
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336
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350 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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351
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352 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
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353 s->out = pscf->starttls_capability;
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354 return NGX_OK;
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355 }
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356
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357 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
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358 s->out = pscf->starttls_only_capability;
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359 return NGX_OK;
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360 }
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361 }
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362
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363 #endif
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364
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365 s->out = pscf->capability;
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366 return NGX_OK;
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367 }
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368
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369
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370 static ngx_int_t
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371 ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c)
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372 {
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373 #if (NGX_MAIL_SSL)
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374 ngx_mail_ssl_conf_t *sslcf;
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375
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376 if (c->ssl == NULL) {
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377 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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378 if (sslcf->starttls) {
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379 c->read->handler = ngx_mail_starttls_handler;
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380 return NGX_OK;
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381 }
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382 }
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383
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384 #endif
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385
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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
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390 static ngx_int_t
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391 ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c)
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392 {
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393 ngx_str_t *arg;
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394 ngx_mail_pop3_srv_conf_t *pscf;
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395
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396 #if (NGX_MAIL_SSL)
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397 if (ngx_mail_starttls_only(s, c)) {
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398 return NGX_MAIL_PARSE_INVALID_COMMAND;
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399 }
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400 #endif
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401
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402 if (s->args.nelts != 2) {
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403 return NGX_MAIL_PARSE_INVALID_COMMAND;
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404 }
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405
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406 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
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407
|
|
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408 if (!(pscf->auth_methods & NGX_MAIL_AUTH_APOP_ENABLED)) {
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|
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409 return NGX_MAIL_PARSE_INVALID_COMMAND;
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|
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410 }
|
|
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411
|
|
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412 arg = s->args.elts;
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|
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413
|
|
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414 s->login.len = arg[0].len;
|
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382
|
415 s->login.data = ngx_pnalloc(c->pool, s->login.len);
|
|
336
|
416 if (s->login.data == NULL) {
|
|
|
417 return NGX_ERROR;
|
|
|
418 }
|
|
|
419
|
|
|
420 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
|
|
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421
|
|
|
422 s->passwd.len = arg[1].len;
|
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382
|
423 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len);
|
|
336
|
424 if (s->passwd.data == NULL) {
|
|
|
425 return NGX_ERROR;
|
|
|
426 }
|
|
|
427
|
|
|
428 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len);
|
|
|
429
|
|
|
430 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
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|
|
431 "pop3 apop: \"%V\" \"%V\"", &s->login, &s->passwd);
|
|
|
432
|
|
|
433 s->auth_method = NGX_MAIL_AUTH_APOP;
|
|
|
434
|
|
|
435 return NGX_DONE;
|
|
|
436 }
|
|
|
437
|
|
|
438
|
|
|
439 static ngx_int_t
|
|
|
440 ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
441 {
|
|
|
442 ngx_int_t rc;
|
|
|
443 ngx_mail_pop3_srv_conf_t *pscf;
|
|
|
444
|
|
|
445 #if (NGX_MAIL_SSL)
|
|
|
446 if (ngx_mail_starttls_only(s, c)) {
|
|
|
447 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
448 }
|
|
|
449 #endif
|
|
|
450
|
|
|
451 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
|
|
|
452
|
|
|
453 if (s->args.nelts == 0) {
|
|
|
454 s->out = pscf->auth_capability;
|
|
|
455 s->state = 0;
|
|
|
456
|
|
|
457 return NGX_OK;
|
|
|
458 }
|
|
|
459
|
|
|
460 rc = ngx_mail_auth_parse(s, c);
|
|
|
461
|
|
|
462 switch (rc) {
|
|
|
463
|
|
|
464 case NGX_MAIL_AUTH_LOGIN:
|
|
|
465
|
|
570
|
466 ngx_str_set(&s->out, pop3_username);
|
|
336
|
467 s->mail_state = ngx_pop3_auth_login_username;
|
|
|
468
|
|
|
469 return NGX_OK;
|
|
|
470
|
|
444
|
471 case NGX_MAIL_AUTH_LOGIN_USERNAME:
|
|
|
472
|
|
570
|
473 ngx_str_set(&s->out, pop3_password);
|
|
444
|
474 s->mail_state = ngx_pop3_auth_login_password;
|
|
|
475
|
|
|
476 return ngx_mail_auth_login_username(s, c, 1);
|
|
|
477
|
|
336
|
478 case NGX_MAIL_AUTH_PLAIN:
|
|
|
479
|
|
570
|
480 ngx_str_set(&s->out, pop3_next);
|
|
336
|
481 s->mail_state = ngx_pop3_auth_plain;
|
|
|
482
|
|
|
483 return NGX_OK;
|
|
|
484
|
|
|
485 case NGX_MAIL_AUTH_CRAM_MD5:
|
|
|
486
|
|
|
487 if (!(pscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
|
|
|
488 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
489 }
|
|
|
490
|
|
|
491 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) {
|
|
|
492 s->mail_state = ngx_pop3_auth_cram_md5;
|
|
|
493 return NGX_OK;
|
|
|
494 }
|
|
|
495
|
|
|
496 return NGX_ERROR;
|
|
|
497 }
|
|
|
498
|
|
|
499 return rc;
|
|
|
500 }
|
