| 1 | // Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. |
| 2 | |
| 3 | #include "precomp.h" |
| 4 | |
| 5 | |
| 6 | // function definitions |
| 7 | |
| 8 | extern "C" HRESULT ApprovedExesParseFromXml( |
| 9 | __in BURN_APPROVED_EXES* pApprovedExes, |
| 10 | __in IXMLDOMNode* pixnBundle |
| 11 | ) |
| 12 | { |
| 13 | HRESULT hr = S_OK; |
| 14 | IXMLDOMNodeList* pixnNodes = NULL; |
| 15 | IXMLDOMNode* pixnNode = NULL; |
| 16 | DWORD cNodes = 0; |
| 17 | LPWSTR scz = NULL; |
| 18 | |
| 19 | // select approved exe nodes |
| 20 | hr = XmlSelectNodes(pixnBundle, L"ApprovedExeForElevation", &pixnNodes); |
| 21 | ExitOnFailure(hr, "Failed to select approved exe nodes."); |
| 22 | |
| 23 | // get approved exe node count |
| 24 | hr = pixnNodes->get_length((long*)&cNodes); |
| 25 | ExitOnFailure(hr, "Failed to get approved exe node count."); |
| 26 | |
| 27 | if (!cNodes) |
| 28 | { |
| 29 | ExitFunction(); |
| 30 | } |
| 31 | |
| 32 | // allocate memory for approved exes |
| 33 | pApprovedExes->rgApprovedExes = (BURN_APPROVED_EXE*)MemAlloc(sizeof(BURN_APPROVED_EXE) * cNodes, TRUE); |
| 34 | ExitOnNull(pApprovedExes->rgApprovedExes, hr, E_OUTOFMEMORY, "Failed to allocate memory for approved exe structs."); |
| 35 | |
| 36 | pApprovedExes->cApprovedExes = cNodes; |
| 37 | |
| 38 | // parse approved exe elements |
| 39 | for (DWORD i = 0; i < cNodes; ++i) |
| 40 | { |
| 41 | BURN_APPROVED_EXE* pApprovedExe = &pApprovedExes->rgApprovedExes[i]; |
| 42 | |
| 43 | hr = XmlNextElement(pixnNodes, &pixnNode, NULL); |
| 44 | ExitOnFailure(hr, "Failed to get next node."); |
| 45 | |
| 46 | // @Id |
| 47 | hr = XmlGetAttributeEx(pixnNode, L"Id", &pApprovedExe->sczId); |
| 48 | ExitOnFailure(hr, "Failed to get @Id."); |
| 49 | |
| 50 | // @Key |
| 51 | hr = XmlGetAttributeEx(pixnNode, L"Key", &pApprovedExe->sczKey); |
| 52 | ExitOnFailure(hr, "Failed to get @Key."); |
| 53 | |
| 54 | // @ValueName |
| 55 | hr = XmlGetAttributeEx(pixnNode, L"ValueName", &pApprovedExe->sczValueName); |
| 56 | if (E_NOTFOUND != hr) |
| 57 | { |
| 58 | ExitOnFailure(hr, "Failed to get @ValueName."); |
| 59 | } |
| 60 | |
| 61 | // @Win64 |
| 62 | hr = XmlGetYesNoAttribute(pixnNode, L"Win64", &pApprovedExe->fWin64); |
| 63 | if (E_NOTFOUND != hr) |
| 64 | { |
| 65 | ExitOnFailure(hr, "Failed to get @Win64."); |
| 66 | } |
| 67 | |
| 68 | // prepare next iteration |
| 69 | ReleaseNullObject(pixnNode); |
| 70 | ReleaseNullStr(scz); |
| 71 | } |
| 72 | |
| 73 | hr = S_OK; |
| 74 | |
| 75 | LExit: |
| 76 | ReleaseObject(pixnNodes); |
| 77 | ReleaseObject(pixnNode); |
| 78 | ReleaseStr(scz); |
| 79 | return hr; |
| 80 | } |
| 81 | |
| 82 | extern "C" void ApprovedExesUninitialize( |
| 83 | __in BURN_APPROVED_EXES* pApprovedExes |
| 84 | ) |
| 85 | { |
| 86 | if (pApprovedExes->rgApprovedExes) |
| 87 | { |
| 88 | for (DWORD i = 0; i < pApprovedExes->cApprovedExes; ++i) |
| 89 | { |
| 90 | BURN_APPROVED_EXE* pApprovedExe = &pApprovedExes->rgApprovedExes[i]; |
| 91 | |
| 92 | ReleaseStr(pApprovedExe->sczId); |
| 93 | ReleaseStr(pApprovedExe->sczKey); |
| 94 | ReleaseStr(pApprovedExe->sczValueName); |
| 95 | } |
| 96 | MemFree(pApprovedExes->rgApprovedExes); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | extern "C" void ApprovedExesUninitializeLaunch( |
| 101 | __in BURN_LAUNCH_APPROVED_EXE* pLaunchApprovedExe |
| 102 | ) |
| 103 | { |
| 104 | if (pLaunchApprovedExe) |
| 105 | { |
| 106 | ReleaseStr(pLaunchApprovedExe->sczArguments); |
| 107 | ReleaseStr(pLaunchApprovedExe->sczExecutablePath); |
| 108 | ReleaseStr(pLaunchApprovedExe->sczId); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | extern "C" HRESULT ApprovedExesFindById( |
| 113 | __in BURN_APPROVED_EXES* pApprovedExes, |
| 114 | __in_z LPCWSTR wzId, |
| 115 | __out BURN_APPROVED_EXE** ppApprovedExe |
| 116 | ) |
| 117 | { |
| 118 | HRESULT hr = S_OK; |
| 119 | BURN_APPROVED_EXE* pApprovedExe = NULL; |
| 120 | |
| 121 | for (DWORD i = 0; i < pApprovedExes->cApprovedExes; ++i) |
| 122 | { |
| 123 | pApprovedExe = &pApprovedExes->rgApprovedExes[i]; |
| 124 | |
| 125 | if (CSTR_EQUAL == ::CompareStringW(LOCALE_INVARIANT, 0, pApprovedExe->sczId, -1, wzId, -1)) |
| 126 | { |
| 127 | *ppApprovedExe = pApprovedExe; |
| 128 | ExitFunction1(hr = S_OK); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | hr = E_NOTFOUND; |
| 133 | |
| 134 | LExit: |
| 135 | return hr; |
| 136 | } |
| 137 | |
| 138 | extern "C" HRESULT ApprovedExesLaunch( |
| 139 | __in BURN_VARIABLES* pVariables, |
| 140 | __in BURN_LAUNCH_APPROVED_EXE* pLaunchApprovedExe, |
| 141 | __out DWORD* pdwProcessId |
| 142 | ) |
| 143 | { |
| 144 | HRESULT hr = S_OK; |
| 145 | LPWSTR sczArgumentsFormatted = NULL; |
| 146 | LPWSTR sczArgumentsObfuscated = NULL; |
| 147 | LPWSTR sczCommand = NULL; |
| 148 | LPWSTR sczCommandObfuscated = NULL; |
| 149 | LPWSTR sczExecutableDirectory = NULL; |
| 150 | size_t cchExecutableDirectory = 0; |
| 151 | STARTUPINFOW si = { }; |
| 152 | PROCESS_INFORMATION pi = { }; |
| 153 | |
| 154 | // build command |
| 155 | if (pLaunchApprovedExe->sczArguments && *pLaunchApprovedExe->sczArguments) |
| 156 | { |
| 157 | hr = VariableFormatString(pVariables, pLaunchApprovedExe->sczArguments, &sczArgumentsFormatted, NULL); |
| 158 | ExitOnFailure(hr, "Failed to format argument string."); |
| 159 | |
| 160 | hr = StrAllocFormattedSecure(&sczCommand, L"\"%ls\" %s", pLaunchApprovedExe->sczExecutablePath, sczArgumentsFormatted); |
| 161 | ExitOnFailure(hr, "Failed to create executable command."); |
| 162 | |
| 163 | hr = VariableFormatStringObfuscated(pVariables, pLaunchApprovedExe->sczArguments, &sczArgumentsObfuscated, NULL); |
| 164 | ExitOnFailure(hr, "Failed to format obfuscated argument string."); |
| 165 | |
| 166 | hr = StrAllocFormatted(&sczCommandObfuscated, L"\"%ls\" %s", pLaunchApprovedExe->sczExecutablePath, sczArgumentsObfuscated); |
| 167 | } |
| 168 | else |
| 169 | { |
| 170 | hr = StrAllocFormatted(&sczCommand, L"\"%ls\"", pLaunchApprovedExe->sczExecutablePath); |
| 171 | ExitOnFailure(hr, "Failed to create executable command."); |
| 172 | |
| 173 | hr = StrAllocFormatted(&sczCommandObfuscated, L"\"%ls\"", pLaunchApprovedExe->sczExecutablePath); |
| 174 | } |
| 175 | ExitOnFailure(hr, "Failed to create obfuscated executable command."); |
| 176 | |
| 177 | // Try to get the directory of the executable so we can set the current directory of the process to help those executables |
| 178 | // that expect stuff to be relative to them. Best effort only. |
| 179 | hr = PathGetDirectory(pLaunchApprovedExe->sczExecutablePath, &sczExecutableDirectory); |
| 180 | if (SUCCEEDED(hr)) |
| 181 | { |
| 182 | // CreateProcessW has undocumented MAX_PATH restriction for lpCurrentDirectory even when long path support is enabled. |
| 183 | hr = ::StringCchLengthW(sczExecutableDirectory, MAX_PATH - 1, &cchExecutableDirectory); |
| 184 | } |
| 185 | |
| 186 | if (FAILED(hr)) |
| 187 | { |
| 188 | ReleaseNullStr(sczExecutableDirectory); |
| 189 | |
| 190 | hr = S_OK; |
| 191 | } |
| 192 | |
| 193 | LogId(REPORT_STANDARD, MSG_LAUNCHING_APPROVED_EXE, pLaunchApprovedExe->sczExecutablePath, sczCommandObfuscated); |
| 194 | |
| 195 | si.cb = sizeof(si); |
| 196 | if (!::CreateProcessW(pLaunchApprovedExe->sczExecutablePath, sczCommand, NULL, NULL, FALSE, CREATE_NEW_PROCESS_GROUP, NULL, sczExecutableDirectory, &si, &pi)) |
| 197 | { |
| 198 | ExitWithLastError(hr, "Failed to CreateProcess on path: %ls", pLaunchApprovedExe->sczExecutablePath); |
| 199 | } |
| 200 | |
| 201 | *pdwProcessId = pi.dwProcessId; |
| 202 | |
| 203 | if (pLaunchApprovedExe->dwWaitForInputIdleTimeout) |
| 204 | { |
| 205 | ::WaitForInputIdle(pi.hProcess, pLaunchApprovedExe->dwWaitForInputIdleTimeout); |
| 206 | } |
| 207 | |
| 208 | LExit: |
| 209 | StrSecureZeroFreeString(sczArgumentsFormatted); |
| 210 | ReleaseStr(sczArgumentsObfuscated); |
| 211 | StrSecureZeroFreeString(sczCommand); |
| 212 | ReleaseStr(sczCommandObfuscated); |
| 213 | ReleaseStr(sczExecutableDirectory); |
| 214 | |
| 215 | ReleaseHandle(pi.hThread); |
| 216 | ReleaseHandle(pi.hProcess); |
| 217 | |
| 218 | return hr; |
| 219 | } |
| 220 | |
| 221 | extern "C" HRESULT ApprovedExesVerifySecureLocation( |
| 222 | __in BURN_CACHE* pCache, |
| 223 | __in BURN_VARIABLES* pVariables, |
| 224 | __in LPCWSTR wzExecutablePath |
| 225 | ) |
| 226 | { |
| 227 | HRESULT hr = S_OK; |
| 228 | LPWSTR scz = NULL; |
| 229 | LPWSTR sczSecondary = NULL; |
| 230 | |
| 231 | const LPCWSTR vrgSecureFolderVariables[] = { |
| 232 | L"ProgramFiles64Folder", |
| 233 | L"ProgramFilesFolder", |
| 234 | }; |
| 235 | |
| 236 | for (DWORD i = 0; i < countof(vrgSecureFolderVariables); ++i) |
| 237 | { |
| 238 | LPCWSTR wzSecureFolderVariable = vrgSecureFolderVariables[i]; |
| 239 | |
| 240 | hr = VariableGetString(pVariables, wzSecureFolderVariable, &scz); |
| 241 | if (SUCCEEDED(hr)) |
| 242 | { |
| 243 | hr = PathDirectoryContainsPath(scz, wzExecutablePath); |
| 244 | if (S_OK == hr) |
| 245 | { |
| 246 | ExitFunction(); |
| 247 | } |
| 248 | } |
| 249 | else if (E_NOTFOUND != hr) |
| 250 | { |
| 251 | ExitOnFailure(hr, "Failed to get the variable: %ls", wzSecureFolderVariable); |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | // The problem with using a Variable for the root package cache folder is that it might not have been secured yet. |
| 256 | // Getting it through CacheGetPerMachineRootCompletedPath makes sure it has been secured. |
| 257 | hr = CacheGetPerMachineRootCompletedPath(pCache, &scz, &sczSecondary); |
| 258 | ExitOnFailure(hr, "Failed to get the root package cache folder."); |
| 259 | |
| 260 | // If the package cache is redirected, hr is S_FALSE. |
| 261 | if (S_FALSE == hr) |
| 262 | { |
| 263 | hr = PathDirectoryContainsPath(sczSecondary, wzExecutablePath); |
| 264 | if (S_OK == hr) |
| 265 | { |
| 266 | ExitFunction(); |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | hr = PathDirectoryContainsPath(scz, wzExecutablePath); |
| 271 | if (S_OK == hr) |
| 272 | { |
| 273 | ExitFunction(); |
| 274 | } |
| 275 | |
| 276 | hr = S_FALSE; |
| 277 | |
| 278 | LExit: |
| 279 | ReleaseStr(scz); |
| 280 | ReleaseStr(sczSecondary); |
| 281 | |
| 282 | return hr; |
| 283 | } |