Reading and Changing Security Descriptors in .NET framework

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Reading and Changing Security Descriptors
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Now that a security descriptor is associated with a file, the next step is to determine the security of an existing file and, in turn, change it The following functions get and set file security in terms of security descriptors BOOL GetFileSecurity ( LPCTSTR lpFileName, SECURITY_INFORMATION secInfo, PSECURITY_DESCRIPTOR pSecurityDescriptor, DWORD cbSd, LPDWORD lpcbLengthNeeded) BOOL SetFileSecurity ( LPCTSTR lpFileName, SECURITY_INFORMATION secInfo, PSECURITY_DESCRIPTOR pSecurityDescriptor)
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secInfo is an enumerated type that takes on values such as OWNER_SECURITY_INFORMATION, GROUP_SECURITY_INFORMATION, DACL_SECURITY_INFORMATION, and SACL_SECURITY_INFORMATION to indicate what part of the security descriptor to get or set These values can be combined with the bitwise "or" operator To figure out the size of the return buffer for GetFileSecurity, the best strategy is to call the function twice The first call simply uses 0 as the cbSd value After allocating a buffer, call the function a second time Program 15-4 operates this way Needless to say, the correct file permissions are required in order to carry out these operations For example, it is necessary to have WRITE_DAC permission or to be the object's owner to succeed with SetFileSecurity The functions GetSecurityDescriptorOwner and GetSecurityDescriptorGroup can extract the SIDs from the security descriptor obtained with GetFileSecurity Obtain the ACL with the GetSecurityDescriptorDacl function BOOL GetSecurityDescriptorDacl ( PSECURITY_DESCRIPTOR pSecurityDescriptor, LPBOOL lpbDaclPresent, PACL *pAcl, LPBOOL lpbDaclDefaulted)
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The parameters are nearly identical to those of SetSecurityDescriptorDacl except that the flags are returned to indicate whether a discretionary ACL is actually present and was set as a default or by a user To interpret an ACL, it is necessary to find out how many ACEs it contains BOOL GetAclInformation ( PACL pAcl, LPVOID pAclInformation,
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DWORD cbAclInfo, ACL_INFORMATION_CLASS dwAclInfoClass)
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In most cases, the ACL information class, dwAclInfoClass, is AclSizeInformation, and the pAclInformation parameter is a structure of type ACL_SIZE_INFORMATION AclRevisionInformation is the other value for the class An ACL_SIZE_INFORMATION structure has three members: the most important one is AceCount, which shows how many entries are in the list To determine whether the ACL is large enough, look at the AclBytesInUse and AclBytesFree members of the ACL_SIZE_INFORMATION structure The GetAce function retrieves ACEs by index BOOL GetAce ( PACL pAcl, DWORD dwAceIndex, LPVOID *pAce)
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Obtain the ACEs (the total number is now known) by using an index pAce points to an ACE structure, which has a member called Header, which, in turn, has an AceType member The type can be tested for ACCESS_ALLOWED_ACE and ACCESS_DENIED_ACE
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Example: Reading File Permissions
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Program 15-4 is the function ReadFilePermissions, which is used by Programs 15-1 and 15-2 This program methodically uses the preceding functions to extract the information Its correct operation depends on the fact that the ACL was created by Program 15-3 The function is in the same source module as Program 15-3, so the definitions are not repeated
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Program 15-4 ReadFilePermissions: Reading Security Attributes
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DWORD ReadFilePermissions (LPCTSTR lpFileName, LPTSTR UsrNm, LPTSTR GrpNm) /* Return the UNIX-style permissions for a file */ { PSECURITY_DESCRIPTOR pSD = NULL; DWORD LenNeeded, PBits, iAce; BOOL DaclF, AclDefF, OwnerDefF, GroupDefF; BYTE DAcl [ACL_SIZE]; PACL pAcl = (PACL) &DAcl; ACL_SIZE_INFORMATION ASizeInfo; PACCESS_ALLOWED_ACE pAce; BYTE AType; HANDLE ProcHeap = GetProcessHeap (); PSID pOwnerSid, pGroupSid; TCHAR RefDomain [2] [DOM_SIZE]; DWORD RefDomCnt [] = {DOM_SIZE, DOM_SIZE}; DWORD AcctSize [] = {ACCT_NAME_SIZE, ACCT_NAME_SIZE}; SID_NAME_USE sNamUse [] = {SidTypeUser, SidTypeGroup}; /* Get the required size for the security descriptor */ GetFileSecurity (lpFileName, OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION, pSD, 0, &LenNeeded); pSD = HeapAlloc (ProcHeap, HEAP_GENERATE_EXCEPTIONS, LenNeeded); GetFileSecurity (lpFileName, OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION, pSD, LenNeeded, &LenNeeded); GetSecurityDescriptorDacl (pSD, &DaclF, &pAcl, &AclDefF); GetAclInformation (pAcl, &ASizeInfo, sizeof (ACL_SIZE_INFORMATION), AclSizeInformation); PBits = 0; /* Compute the permissions from the ACL */ for (iAce = 0; iAce < ASizeInfoAceCount; iAce++) { GetAce (pAcl, iAce, &pAce); AType = pAce->HeaderAceType; if (AType == ACCESS_ALLOWED_ACE_TYPE) PBits |= (0x1 << (8-iAce)); } /* Find the name of the owner and owning group */ GetSecurityDescriptorOwner (pSD, &pOwnerSid, &OwnerDefF); GetSecurityDescriptorGroup (pSD, &pGroupSid, &GroupDefF); LookupAccountSid (NULL, pOwnerSid, UsrNm, &AcctSize [0], RefDomain [0], &RefDomCnt [0], &sNamUse [0]); LookupAccountSid (NULL, pGroupSid, GrpNm, &AcctSize [1], RefDomain [1], &RefDomCnt [1], &sNamUse [1]); return PBits; }
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