145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
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//+--------------------------------------------------------------------------
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// File: sid.h
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// Contents: class incapsulating a SID
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//---------------------------------------------------------------------------
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#ifndef __CERTSRV_CSID__
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#define __CERTSRV_CSID__
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#include <sddl.h>
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namespace CertSrv
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{
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class CSid
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{
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public:
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CSid() {Init();}
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CSid(PSID pSid) {Init(); CopySid(pSid);}
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CSid(const CSid ©Sid) {Init(); CopySid(copySid.m_pSid);}
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CSid(LPCWSTR pcwszSid) {Init(); CopySid(pcwszSid);}
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~CSid()
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{
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if(m_pSid)
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LocalFree(m_pSid);
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if(m_pwszSid)
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LocalFree(m_pwszSid);
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if(m_pwszName)
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LocalFree(m_pwszName);
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}
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operator LPCWSTR()
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{
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return GetStringSid();
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}
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operator PSID() {return m_pSid;}
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LPCWSTR GetName()
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{
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// attemp to map sid to name only once
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if(m_fCantResolveName ||
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S_OK!=MapSidToName())
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{
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m_fCantResolveName = TRUE;
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return GetStringSid();
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}
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return m_pwszName;
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}
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PSID GetSid() { return m_pSid;}
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protected:
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void Init()
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{
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m_pSid = NULL;
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m_pwszSid = NULL;
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m_pwszName = NULL;
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m_fCantResolveName = FALSE;
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}
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void SetStringSid()
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{
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if(m_pSid)
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myConvertSidToStringSid(m_pSid, &m_pwszSid);
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}
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LPCWSTR GetStringSid()
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{
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if(!m_pwszSid)
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SetStringSid();
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return m_pwszSid?m_pwszSid:L"";
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}
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void CopySid(PSID pSid)
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{
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ULONG cbSid = GetLengthSid(pSid);
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m_pSid = (BYTE *) LocalAlloc(LMEM_FIXED, cbSid);
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if(m_pSid && !::CopySid(cbSid, m_pSid, pSid))
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{
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LocalFree(m_pSid);
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m_pSid = NULL;
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}
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}
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void CopySid(LPCWSTR pcwszSid)
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{
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if(pcwszSid)
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myConvertStringSidToSid(pcwszSid, &m_pSid);
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}
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HRESULT MapSidToName()
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{
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if(m_pwszName)
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return S_OK;
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WCHAR wszDummyBuffer[2];
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DWORD cchName = 0, cchDomain = 0;
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SID_NAME_USE use;
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LookupAccountSid(
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NULL,
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m_pSid,
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NULL,
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&cchName,
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NULL,
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&cchDomain,
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&use);
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if(ERROR_INSUFFICIENT_BUFFER!=GetLastError())
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{
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DWORD err = GetLastError();
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return HRESULT_FROM_WIN32(GetLastError());
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}
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// build the full name "Domain\Name"
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m_pwszName = (LPWSTR) LocalAlloc(
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LMEM_FIXED,
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sizeof(WCHAR)*(cchName+cchDomain+2));
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if(!m_pwszName)
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{
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return E_OUTOFMEMORY;
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}
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// special case for Everyone, LookupAccountSid returns empty domain name for it
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if(!LookupAccountSid(
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NULL,
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m_pSid,
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m_pwszName+((1==cchDomain)?0:cchDomain),
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&cchName,
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(1==cchDomain)?wszDummyBuffer:m_pwszName,
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&cchDomain,
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&use))
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{
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LocalFree(m_pwszName);
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m_pwszName = NULL;
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return HRESULT_FROM_WIN32(GetLastError());
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}
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if(cchDomain>1)
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{
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m_pwszName[cchDomain] = L'\\';
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}
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return S_OK;
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}
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CSid operator=(const CSid& sid); //protect callers from using it
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PSID m_pSid;
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LPWSTR m_pwszSid;
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LPWSTR m_pwszName;
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BOOL m_fCantResolveName;
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};
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};//namespace CertSrv
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#endif //__CERTSRV_CSID__
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