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6175
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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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_stream.h>
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11
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12
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13 typedef struct {
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14 in_addr_t mask;
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15 in_addr_t addr;
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16 ngx_uint_t deny; /* unsigned deny:1; */
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17 } ngx_stream_access_rule_t;
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18
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19 #if (NGX_HAVE_INET6)
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20
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21 typedef struct {
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22 struct in6_addr addr;
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23 struct in6_addr mask;
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24 ngx_uint_t deny; /* unsigned deny:1; */
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25 } ngx_stream_access_rule6_t;
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26
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27 #endif
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28
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29 #if (NGX_HAVE_UNIX_DOMAIN)
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30
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31 typedef struct {
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32 ngx_uint_t deny; /* unsigned deny:1; */
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33 } ngx_stream_access_rule_un_t;
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34
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35 #endif
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36
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37 typedef struct {
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38 ngx_array_t *rules; /* array of ngx_stream_access_rule_t */
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39 #if (NGX_HAVE_INET6)
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40 ngx_array_t *rules6; /* array of ngx_stream_access_rule6_t */
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41 #endif
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42 #if (NGX_HAVE_UNIX_DOMAIN)
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43 ngx_array_t *rules_un; /* array of ngx_stream_access_rule_un_t */
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44 #endif
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45 } ngx_stream_access_srv_conf_t;
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46
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47
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48 static ngx_int_t ngx_stream_access_handler(ngx_stream_session_t *s);
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49 static ngx_int_t ngx_stream_access_inet(ngx_stream_session_t *s,
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50 ngx_stream_access_srv_conf_t *ascf, in_addr_t addr);
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51 #if (NGX_HAVE_INET6)
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52 static ngx_int_t ngx_stream_access_inet6(ngx_stream_session_t *s,
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53 ngx_stream_access_srv_conf_t *ascf, u_char *p);
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54 #endif
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55 #if (NGX_HAVE_UNIX_DOMAIN)
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56 static ngx_int_t ngx_stream_access_unix(ngx_stream_session_t *s,
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57 ngx_stream_access_srv_conf_t *ascf);
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58 #endif
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59 static ngx_int_t ngx_stream_access_found(ngx_stream_session_t *s,
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60 ngx_uint_t deny);
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61 static char *ngx_stream_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
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62 void *conf);
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63 static void *ngx_stream_access_create_srv_conf(ngx_conf_t *cf);
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64 static char *ngx_stream_access_merge_srv_conf(ngx_conf_t *cf,
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65 void *parent, void *child);
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66 static ngx_int_t ngx_stream_access_init(ngx_conf_t *cf);
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67
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68
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69 static ngx_command_t ngx_stream_access_commands[] = {
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70
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71 { ngx_string("allow"),
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72 NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
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73 ngx_stream_access_rule,
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74 NGX_STREAM_SRV_CONF_OFFSET,
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75 0,
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76 NULL },
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77
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78 { ngx_string("deny"),
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79 NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
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80 ngx_stream_access_rule,
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81 NGX_STREAM_SRV_CONF_OFFSET,
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82 0,
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83 NULL },
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84
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85 ngx_null_command
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86 };
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87
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88
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89
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90 static ngx_stream_module_t ngx_stream_access_module_ctx = {
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91 ngx_stream_access_init, /* postconfiguration */
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92
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93 NULL, /* create main configuration */
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94 NULL, /* init main configuration */
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95
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96 ngx_stream_access_create_srv_conf, /* create server configuration */
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97 ngx_stream_access_merge_srv_conf /* merge server configuration */
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98 };
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99
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100
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101 ngx_module_t ngx_stream_access_module = {
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102 NGX_MODULE_V1,
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103 &ngx_stream_access_module_ctx, /* module context */
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104 ngx_stream_access_commands, /* module directives */
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105 NGX_STREAM_MODULE, /* module type */
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106 NULL, /* init master */
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107 NULL, /* init module */
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108 NULL, /* init process */
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109 NULL, /* init thread */
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110 NULL, /* exit thread */
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111 NULL, /* exit process */
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112 NULL, /* exit master */
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113 NGX_MODULE_V1_PADDING
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114 };
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115
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116
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117 static ngx_int_t
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118 ngx_stream_access_handler(ngx_stream_session_t *s)
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119 {
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120 struct sockaddr_in *sin;
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121 ngx_stream_access_srv_conf_t *ascf;
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122 #if (NGX_HAVE_INET6)
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123 u_char *p;
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124 in_addr_t addr;
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125 struct sockaddr_in6 *sin6;
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126 #endif
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127
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128 ascf = ngx_stream_get_module_srv_conf(s, ngx_stream_access_module);
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129
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130 switch (s->connection->sockaddr->sa_family) {
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131
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132 case AF_INET:
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133 if (ascf->rules) {
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134 sin = (struct sockaddr_in *) s->connection->sockaddr;
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135 return ngx_stream_access_inet(s, ascf, sin->sin_addr.s_addr);
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136 }
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137 break;
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138
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139 #if (NGX_HAVE_INET6)
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140
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141 case AF_INET6:
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142 sin6 = (struct sockaddr_in6 *) s->connection->sockaddr;
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143 p = sin6->sin6_addr.s6_addr;
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144
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145 if (ascf->rules && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
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146 addr = p[12] << 24;
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147 addr += p[13] << 16;
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148 addr += p[14] << 8;
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149 addr += p[15];
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150 return ngx_stream_access_inet(s, ascf, htonl(addr));
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151 }
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152
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153 if (ascf->rules6) {
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154 return ngx_stream_access_inet6(s, ascf, p);
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155 }
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156
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157 break;
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158
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159 #endif
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160
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161 #if (NGX_HAVE_UNIX_DOMAIN)
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162
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163 case AF_UNIX:
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164 if (ascf->rules_un) {
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165 return ngx_stream_access_unix(s, ascf);
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166 }
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167
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168 break;
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169
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170 #endif
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171 }
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172
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173 return NGX_DECLINED;
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174 }
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175
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176
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177 static ngx_int_t
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178 ngx_stream_access_inet(ngx_stream_session_t *s,
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179 ngx_stream_access_srv_conf_t *ascf, in_addr_t addr)
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180 {
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181 ngx_uint_t i;
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182 ngx_stream_access_rule_t *rule;
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183
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184 rule = ascf->rules->elts;
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185 for (i = 0; i < ascf->rules->nelts; i++) {
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186
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187 ngx_log_debug3(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
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188 "access: %08XD %08XD %08XD",
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189 addr, rule[i].mask, rule[i].addr);
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190
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191 if ((addr & rule[i].mask) == rule[i].addr) {
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192 return ngx_stream_access_found(s, rule[i].deny);
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193 }
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194 }
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195
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196 return NGX_DECLINED;
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197 }
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198
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199
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200 #if (NGX_HAVE_INET6)
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201
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202 static ngx_int_t
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203 ngx_stream_access_inet6(ngx_stream_session_t *s,
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204 ngx_stream_access_srv_conf_t *ascf, u_char *p)
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205 {
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206 ngx_uint_t n;
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207 ngx_uint_t i;
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208 ngx_stream_access_rule6_t *rule6;
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209
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210 rule6 = ascf->rules6->elts;
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211 for (i = 0; i < ascf->rules6->nelts; i++) {
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212
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213 #if (NGX_DEBUG)
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214 {
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215 size_t cl, ml, al;
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216 u_char ct[NGX_INET6_ADDRSTRLEN];
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217 u_char mt[NGX_INET6_ADDRSTRLEN];
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218 u_char at[NGX_INET6_ADDRSTRLEN];
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219
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220 cl = ngx_inet6_ntop(p, ct, NGX_INET6_ADDRSTRLEN);
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221 ml = ngx_inet6_ntop(rule6[i].mask.s6_addr, mt, NGX_INET6_ADDRSTRLEN);
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222 al = ngx_inet6_ntop(rule6[i].addr.s6_addr, at, NGX_INET6_ADDRSTRLEN);
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223
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224 ngx_log_debug6(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
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225 "access: %*s %*s %*s", cl, ct, ml, mt, al, at);
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226 }
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227 #endif
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228
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229 for (n = 0; n < 16; n++) {
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230 if ((p[n] & rule6[i].mask.s6_addr[n]) != rule6[i].addr.s6_addr[n]) {
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231 goto next;
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232 }
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233 }
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234
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235 return ngx_stream_access_found(s, rule6[i].deny);
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236
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237 next:
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238 continue;
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239 }
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240
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241 return NGX_DECLINED;
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242 }
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243
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244 #endif
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245
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246
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247 #if (NGX_HAVE_UNIX_DOMAIN)
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248
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249 static ngx_int_t
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250 ngx_stream_access_unix(ngx_stream_session_t *s,
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251 ngx_stream_access_srv_conf_t *ascf)
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252 {
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253 ngx_uint_t i;
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254 ngx_stream_access_rule_un_t *rule_un;
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255
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256 rule_un = ascf->rules_un->elts;
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257 for (i = 0; i < ascf->rules_un->nelts; i++) {
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258
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259 /* TODO: check path */
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260 if (1) {
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261 return ngx_stream_access_found(s, rule_un[i].deny);
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262 }
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263 }
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264
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265 return NGX_DECLINED;
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266 }
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267
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268 #endif
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269
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270
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271 static ngx_int_t
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272 ngx_stream_access_found(ngx_stream_session_t *s, ngx_uint_t deny)
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273 {
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274 if (deny) {
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275 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
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276 "access forbidden by rule");
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277 return NGX_ABORT;
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278 }
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279
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280 return NGX_OK;
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281 }
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282
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283
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284 static char *
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285 ngx_stream_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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286 {
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287 ngx_stream_access_srv_conf_t *ascf = conf;
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288
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289 ngx_int_t rc;
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290 ngx_uint_t all;
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291 ngx_str_t *value;
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292 ngx_cidr_t cidr;
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293 ngx_stream_access_rule_t *rule;
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294 #if (NGX_HAVE_INET6)
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295 ngx_stream_access_rule6_t *rule6;
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296 #endif
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297 #if (NGX_HAVE_UNIX_DOMAIN)
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298 ngx_stream_access_rule_un_t *rule_un;
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299 #endif
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300
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301 ngx_memzero(&cidr, sizeof(ngx_cidr_t));
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302
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303 value = cf->args->elts;
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304
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305 all = (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0);
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306
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307 if (!all) {
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308
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309 #if (NGX_HAVE_UNIX_DOMAIN)
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310
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311 if (value[1].len == 5 && ngx_strcmp(value[1].data, "unix:") == 0) {
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312 cidr.family = AF_UNIX;
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313 rc = NGX_OK;
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314
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315 } else {
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316 rc = ngx_ptocidr(&value[1], &cidr);
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317 }
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318
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319 #else
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320 rc = ngx_ptocidr(&value[1], &cidr);
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321 #endif
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322
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323 if (rc == NGX_ERROR) {
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324 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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325 "invalid parameter \"%V\"", &value[1]);
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326 return NGX_CONF_ERROR;
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327 }
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328
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329 if (rc == NGX_DONE) {
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330 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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331 "low address bits of %V are meaningless", &value[1]);
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332 }
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333 }
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334
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335 if (cidr.family == AF_INET || all) {
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336
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337 if (ascf->rules == NULL) {
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338 ascf->rules = ngx_array_create(cf->pool, 4,
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339 sizeof(ngx_stream_access_rule_t));
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340 if (ascf->rules == NULL) {
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341 return NGX_CONF_ERROR;
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342 }
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343 }
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344
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345 rule = ngx_array_push(ascf->rules);
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346 if (rule == NULL) {
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347 return NGX_CONF_ERROR;
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348 }
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349
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350 rule->mask = cidr.u.in.mask;
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351 rule->addr = cidr.u.in.addr;
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352 rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
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353 }
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354
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355 #if (NGX_HAVE_INET6)
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356 if (cidr.family == AF_INET6 || all) {
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357
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358 if (ascf->rules6 == NULL) {
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359 ascf->rules6 = ngx_array_create(cf->pool, 4,
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360 sizeof(ngx_stream_access_rule6_t));
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361 if (ascf->rules6 == NULL) {
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362 return NGX_CONF_ERROR;
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363 }
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364 }
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365
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366 rule6 = ngx_array_push(ascf->rules6);
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367 if (rule6 == NULL) {
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368 return NGX_CONF_ERROR;
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369 }
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370
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371 rule6->mask = cidr.u.in6.mask;
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372 rule6->addr = cidr.u.in6.addr;
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373 rule6->deny = (value[0].data[0] == 'd') ? 1 : 0;
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374 }
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375 #endif
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376
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377 #if (NGX_HAVE_UNIX_DOMAIN)
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378 if (cidr.family == AF_UNIX || all) {
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379
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380 if (ascf->rules_un == NULL) {
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381 ascf->rules_un = ngx_array_create(cf->pool, 1,
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382 sizeof(ngx_stream_access_rule_un_t));
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383 if (ascf->rules_un == NULL) {
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384 return NGX_CONF_ERROR;
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385 }
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386 }
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387
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388 rule_un = ngx_array_push(ascf->rules_un);
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389 if (rule_un == NULL) {
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390 return NGX_CONF_ERROR;
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391 }
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392
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393 rule_un->deny = (value[0].data[0] == 'd') ? 1 : 0;
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394 }
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395 #endif
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396
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397 return NGX_CONF_OK;
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398 }
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399
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400
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401 static void *
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402 ngx_stream_access_create_srv_conf(ngx_conf_t *cf)
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403 {
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404 ngx_stream_access_srv_conf_t *conf;
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405
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406 conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_access_srv_conf_t));
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407 if (conf == NULL) {
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408 return NULL;
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409 }
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410
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411 return conf;
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412 }
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413
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414
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415 static char *
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416 ngx_stream_access_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
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417 {
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418 ngx_stream_access_srv_conf_t *prev = parent;
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419 ngx_stream_access_srv_conf_t *conf = child;
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420
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421 if (conf->rules == NULL
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422 #if (NGX_HAVE_INET6)
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423 && conf->rules6 == NULL
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424 #endif
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425 #if (NGX_HAVE_UNIX_DOMAIN)
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426 && conf->rules_un == NULL
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427 #endif
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428 ) {
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429 conf->rules = prev->rules;
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430 #if (NGX_HAVE_INET6)
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431 conf->rules6 = prev->rules6;
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432 #endif
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433 #if (NGX_HAVE_UNIX_DOMAIN)
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434 conf->rules_un = prev->rules_un;
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435 #endif
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436 }
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437
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438 return NGX_CONF_OK;
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439 }
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440
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441
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442 static ngx_int_t
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443 ngx_stream_access_init(ngx_conf_t *cf)
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444 {
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445 ngx_stream_core_main_conf_t *cmcf;
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446
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447 cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
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448 cmcf->access_handler = ngx_stream_access_handler;
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449
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450 return NGX_OK;
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451 }
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