| 1 | /* |
| 2 | suPHP - (c)2002-2008 Sebastian Marsching <sebastian@marsching.com> |
| 3 | |
| 4 | This file is part of suPHP. |
| 5 | |
| 6 | suPHP is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | suPHP is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with suPHP; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | |
| 21 | #include "PathMatcher.hpp" |
| 22 | #include "Util.hpp" |
| 23 | |
| 24 | using namespace suPHP; |
| 25 | |
| 26 | suPHP::PathMatcher::PathMatcher(const UserInfo& user, const GroupInfo& group) { |
| 27 | this->user = user; |
| 28 | this->group = group; |
| 29 | } |
| 30 | |
| 31 | bool suPHP::PathMatcher::matches(std::string pattern, std::string path) |
| 32 | throw (KeyNotFoundException, ParsingException) { |
| 33 | std::string remainingPath = path; |
| 34 | std::string remainingPattern = pattern; |
| 35 | |
| 36 | while (remainingPath.length() > 0 && remainingPattern.length() > 0) { |
| 37 | bool escapeNext = false; |
| 38 | for (int i = 0; i < remainingPattern.length(); i++) { |
| 39 | char c = remainingPattern.at(i); |
| 40 | if (escapeNext) { |
| 41 | escapeNext = false; |
| 42 | if (c == '\\' || c == '*' || c == '$') { |
| 43 | // Backslash was used as an escape character |
| 44 | if (remainingPath.at(i-1) == c) { |
| 45 | remainingPattern = remainingPattern.substr(i + 1); |
| 46 | remainingPath = remainingPath.substr(i); |
| 47 | break; |
| 48 | } else { |
| 49 | return false; |
| 50 | } |
| 51 | } else { |
| 52 | if (remainingPath.at(i-1) == '\\') { |
| 53 | remainingPattern = remainingPattern.substr(i); |
| 54 | remainingPath = remainingPath.substr(i); |
| 55 | break; |
| 56 | } else { |
| 57 | return false; |
| 58 | } |
| 59 | } |
| 60 | } else { |
| 61 | if (c == '\\') { |
| 62 | escapeNext = true; |
| 63 | } else if (c == '*') { |
| 64 | remainingPattern = remainingPattern.substr(i + 1); |
| 65 | remainingPath = remainingPath.substr(i); |
| 66 | if (matches(remainingPattern, remainingPath)) { |
| 67 | return true; |
| 68 | } |
| 69 | std::string testPrefix; |
| 70 | for (int j = 0; j < remainingPath.length(); j++) { |
| 71 | char c2 = remainingPath.at(j); |
| 72 | if (c2 == '/') { |
| 73 | return false; |
| 74 | } |
| 75 | if (c2 == '\\' || c2 == '*' || c2 == '$') { |
| 76 | testPrefix += "\\"; |
| 77 | } |
| 78 | testPrefix += c2; |
| 79 | if (matches(testPrefix + remainingPattern, |
| 80 | remainingPath)) { |
| 81 | return true; |
| 82 | } |
| 83 | } |
| 84 | } else if (c == '$') { |
| 85 | if (remainingPattern.length() < i + 3) { |
| 86 | throw ParsingException("Incorrect use of $ in pattern \"" + pattern + "\".", __FILE__, __LINE__); |
| 87 | } |
| 88 | if (remainingPattern.at(i + 1) != '{') { |
| 89 | throw ParsingException("Incorrect use of $ in pattern \"" + pattern + "\".", __FILE__, __LINE__); |
| 90 | } |
| 91 | std::string::size_type closingBrace = remainingPattern.find('}', i); |
| 92 | if (closingBrace == std::string::npos) { |
| 93 | throw ParsingException("Incorrect use of $ in pattern \"" + pattern + "\".", __FILE__, __LINE__); |
| 94 | } |
| 95 | std::string varName = remainingPattern.substr(i + 2, closingBrace - i - 2); |
| 96 | remainingPattern = lookupVariable(varName) + remainingPattern.substr(closingBrace + 1); |
| 97 | break; |
| 98 | } else { |
| 99 | if (i >= remainingPath.length() || c != remainingPath.at(i)) { |
| 100 | return false; |
| 101 | } |
| 102 | if (i == remainingPattern.length() - 1) { |
| 103 | if (c == '/' || (i + 1 < remainingPath.length() && remainingPath.at(i + 1) == '/')) { |
| 104 | // Path represents file in subdirectory |
| 105 | return true; |
| 106 | } else if (remainingPath.length() == remainingPattern.length()) { |
| 107 | // Exact match |
| 108 | return true; |
| 109 | } else { |
| 110 | return false; |
| 111 | } |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | } |
| 116 | } |
| 117 | return false; |
| 118 | } |
| 119 | |
| 120 | std::string suPHP::PathMatcher::lookupVariable(std::string str) |
| 121 | throw (KeyNotFoundException) { |
| 122 | std::string rv; |
| 123 | if (str == "USERNAME") { |
| 124 | rv = user.getUsername(); |
| 125 | } else if (str == "UID") { |
| 126 | rv = Util::intToStr(user.getUid()); |
| 127 | } else if (str == "HOME") { |
| 128 | rv = user.getHomeDirectory(); |
| 129 | } else if (str == "GROUPNAME") { |
| 130 | rv = group.getGroupname(); |
| 131 | } else if (str == "GID") { |
| 132 | rv = Util::intToStr(group.getGid()); |
| 133 | } else { |
| 134 | throw KeyNotFoundException("Key \"" + str + |
| 135 | "\" does not represent a valid variable name", __FILE__, __LINE__); |
| 136 | } |
| 137 | return rv; |
| 138 | } |
| 139 | |
| 140 | std::string suPHP::PathMatcher::resolveVariables(std::string str) throw (KeyNotFoundException, ParsingException) { |
| 141 | std::string out; |
| 142 | bool escapeNext = false; |
| 143 | for (int i = 0; i < str.length(); i++) { |
| 144 | char c = str.at(i); |
| 145 | if (escapeNext) { |
| 146 | escapeNext = false; |
| 147 | if (c == '\\' || c == '$') { |
| 148 | // Backslash was used as an escape character |
| 149 | out += c; |
| 150 | } else { |
| 151 | out += '\\'; |
| 152 | out += c; |
| 153 | } |
| 154 | } else { |
| 155 | if (c == '\\') { |
| 156 | escapeNext = true; |
| 157 | } else if (c == '$') { |
| 158 | if (str.length() < i + 3) { |
| 159 | throw ParsingException("Incorrect use of $ in string \"" + str + "\".", __FILE__, __LINE__); |
| 160 | } |
| 161 | if (str.at(i + 1) != '{') { |
| 162 | throw ParsingException("Incorrect use of $ in string \"" + str + "\".", __FILE__, __LINE__); |
| 163 | } |
| 164 | std::string::size_type closingBrace = str.find('}', i); |
| 165 | if (closingBrace == std::string::npos) { |
| 166 | throw ParsingException("Incorrect use of $ in string \"" + str + "\".", __FILE__, __LINE__); |
| 167 | } |
| 168 | std::string varName = str.substr(i + 2, closingBrace - i - 2); |
| 169 | out += lookupVariable(varName); |
| 170 | i = closingBrace + 1; |
| 171 | } else { |
| 172 | out += c; |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | return out; |
| 177 | } |