src/server/safs/pathcheck.c

Fri, 05 May 2023 18:02:11 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Fri, 05 May 2023 18:02:11 +0200
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parent 415
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permissions
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update ucx

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <cx/string.h>
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30
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31 #include "pathcheck.h"
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32
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33 #include "../util/pblock.h"
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34 #include "../daemon/config.h"
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35 #include "../daemon/acl.h"
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36 #include "../daemon/acldata.h"
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37 #include "../daemon/session.h"
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38 #include "../daemon/vserver.h"
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39
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40 #include "../daemon/vfs.h"
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41
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42 #include "../config/acl.h"
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43
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44 #define PATHCHECK_MAX_TOKENS 2048
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45
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46 int require_auth(pblock *pb, Session *sn, Request *rq) {
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47 char *user = pblock_findkeyval(pb_key_auth_user, rq->vars);
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48
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49 if(user == NULL) {
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50 pblock_nvinsert(
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51 "www-authenticate",
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52 "Basic realm=\"Webserver\"",
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53 rq->srvhdrs);
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54
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55 protocol_status(sn, rq, PROTOCOL_UNAUTHORIZED, NULL);
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56 return REQ_ABORTED;
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57 }
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58
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59 return REQ_PROCEED;
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60 }
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61
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62 int require_access(pblock *pb, Session *sn, Request *rq) {
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63 char *mask_str = pblock_findval("mask", pb);
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64 if(!mask_str) {
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65 log_ereport(LOG_MISCONFIG, "require-access: missing mask parameter");
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66 protocol_status(sn, rq, 500, NULL);
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67 return REQ_ABORTED;
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68 }
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69
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70 char *method = pblock_findval("method", pb);
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71 if(method) {
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72 char *m = pblock_findkeyval(pb_key_method, rq->reqpb);
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73 if(strcmp(method, m)) {
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74 return REQ_NOACTION;
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75 }
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76 }
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78 uint32_t access_mask = 0;
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79 cxstring *rights = NULL;
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80 ssize_t n = cx_strsplit_a(pool_allocator(sn->pool), cx_str(mask_str), (cxstring){",", 1}, PATHCHECK_MAX_TOKENS, &rights);
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81 for(int i=0;i<n;i++) {
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82 cxstring right = rights[i];
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83 access_mask = access_mask | accstr2int(right);
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84 }
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85 pool_free(sn->pool, rights);
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86
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87 rq->aclreqaccess = access_mask;
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88
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89 return REQ_PROCEED;
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90 }
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91
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92 int append_acl(pblock *pb, Session *sn, Request *rq) {
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93 const VirtualServer *vs = request_get_vs(rq);
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94
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95 WS_ASSERT(vs);
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96
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97 char *aclname = pblock_findval("acl", pb);
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98 if(aclname) {
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99 ACLList *acl = acl_get(vs->acls, aclname);
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100 if(!acl) {
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101 log_ereport(
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102 LOG_MISCONFIG,
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103 "append-acl: acl %s not found", aclname);
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104 protocol_status(sn, rq, 500, NULL);
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105 return REQ_ABORTED;
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106 }
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107
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108 acllist_append(sn, rq, acl);
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109 }
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110
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111 return REQ_PROCEED;
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112 }
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113
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114
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115 int check_acl(pblock *pb, Session *sn, Request *rq) {
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116 int access_mask = ACL_READ_DATA | rq->aclreqaccess; // TODO: check method and path
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117
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118 int ret = acl_evaluate(sn, rq, access_mask);
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119 if(ret == REQ_ABORTED) {
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120 // TODO: status, error, ...
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121 return REQ_ABORTED;
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122 }
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123
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124 return REQ_PROCEED;
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125 }
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126
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127 int find_index(pblock *pb, Session *sn, Request *rq) {
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128 char *inames = pblock_findval("index-names", pb);
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129 if(!inames) {
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130 log_ereport(
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131 LOG_MISCONFIG,
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132 "find-index: index-names parameter missing");
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133 return REQ_ABORTED;
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134 }
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135
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136 cxstring *names = NULL;
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137 ssize_t ni = cx_strsplit_a(pool_allocator(sn->pool), cx_str(inames), (cxstring)CX_STR(","), PATHCHECK_MAX_TOKENS, &names);
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138 if(ni <= 0) {
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139 log_ereport(
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140 LOG_MISCONFIG,
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141 "find-index: no files specified in index-names parameter");
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142 return REQ_ABORTED;
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143 }
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144
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145 // only find index for GET requests
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146 // maybe we want to support find-index for other methods, in that case
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147 // we should implement a parameter for this
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148 char *method = pblock_findkeyval(pb_key_method, rq->reqpb);
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149 if(strcmp(method, "GET")) {
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150 return REQ_NOACTION;
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151 }
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152
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153 VFSContext *vfs = vfs_request_context(sn, rq);
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154 int ret = REQ_NOACTION;
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155
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156 char *path = pblock_findkeyval(pb_key_path, rq->vars);
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157 size_t pathlen = strlen(path);
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158 cxstring p = cx_strn(path, pathlen);
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159 if(path[pathlen-1] == '/') {
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160 for(int i=0;i<ni;i++) {
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161 cxmutstr newpath = cx_strcat(2, p, cx_strtrim(names[i]));
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162 struct stat s;
404
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163 if(!vfs_stat(vfs, newpath.ptr, &s)) {
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164 pblock_kvinsert(
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165 pb_key_path,
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166 newpath.ptr,
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167 newpath.length,
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168 rq->vars);
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169 free(newpath.ptr);
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170 ret = REQ_PROCEED;
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171 } else {
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172 free(newpath.ptr);
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173 }
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174 }
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175 }
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176
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177 pool_free(sn->pool, names);
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178
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179 return ret;
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180 }
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181
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182 int dir_redirect(pblock *pb, Session *sn, Request *rq) {
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183 char *path = pblock_findkeyval(pb_key_path, rq->vars);
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184
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185 VFSContext *vfs = vfs_request_context(sn, rq);
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186
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187 struct stat s;
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188 if(vfs_stat(vfs, path, &s) != 0) {
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189 return REQ_NOACTION;
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190 }
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191
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192 // TODO: remove code duplication (service.c)
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193 // TODO: make response code configurable
142
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194 if(S_ISDIR(s.st_mode) && path[strlen(path)-1] != '/') {
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195 pblock_nvinsert("content-length", "0", rq->srvhdrs);
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196 pblock_removekey(pb_key_content_type, rq->srvhdrs);
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197 char *uri = pblock_findkeyval(pb_key_uri, rq->reqpb);
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198 size_t urilen = strlen(uri);
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199 char *location = pool_malloc(sn->pool, urilen + 2);
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200 memcpy(location, uri, urilen);
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201 location[urilen] = '/';
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202 location[urilen+1] = '\0';
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203 pblock_kvinsert(pb_key_location, location, urilen + 1, rq->srvhdrs);
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204 protocol_status(sn, rq, 302, NULL);
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205 http_start_response(sn, rq);
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206 return REQ_ABORTED;
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207 }
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208
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209 return REQ_PROCEED;
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210 }

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