X-Git-Url: http://git.iain.cx/?a=blobdiff_plain;f=account.cpp;h=cb7fcdb20b6e6e7d14863bfd02cc1898f51f2016;hb=62f28c55d444d846579159133dbe091809a2c08b;hp=5e6523f5383aa5cd4337ca77e359325ef0f0e751;hpb=f5ce09a04c7575316ceb640533087e3ce9ae7de1;p=nssm.git

diff --git a/account.cpp b/account.cpp
index 5e6523f..cb7fcdb 100644
--- a/account.cpp
+++ b/account.cpp
@@ -1,252 +1,358 @@
-#include "nssm.h"
-
-#include <sddl.h>
-
-extern imports_t imports;
-
-/* Open Policy object. */
-int open_lsa_policy(LSA_HANDLE *policy) {
-  LSA_OBJECT_ATTRIBUTES attributes;
-  ZeroMemory(&attributes, sizeof(attributes));
-
-  NTSTATUS status = LsaOpenPolicy(0, &attributes, POLICY_ALL_ACCESS, policy);
-  if (status) {
-    print_message(stderr, NSSM_MESSAGE_LSAOPENPOLICY_FAILED, error_string(LsaNtStatusToWinError(status)));
-    return 1;
-  }
-
-  return 0;
-}
-
-/* Look up SID for an account. */
-int username_sid(const TCHAR *username, SID **sid, LSA_HANDLE *policy) {
-  LSA_HANDLE handle;
-  if (! policy) {
-    policy = &handle;
-    if (open_lsa_policy(policy)) return 1;
-  }
-
-  LSA_UNICODE_STRING lsa_username;
-#ifdef UNICODE
-  lsa_username.Buffer = (wchar_t *) username;
-  lsa_username.Length = (unsigned short) _tcslen(username) * sizeof(TCHAR);
-  lsa_username.MaximumLength = lsa_username.Length + sizeof(TCHAR);
-#else
-  size_t buflen;
-  mbstowcs_s(&buflen, NULL, 0, username, _TRUNCATE);
-  lsa_username.MaximumLength = (unsigned short) buflen * sizeof(wchar_t);
-  lsa_username.Length = lsa_username.MaximumLength - sizeof(wchar_t);
-  lsa_username.Buffer = (wchar_t *) HeapAlloc(GetProcessHeap(), 0, lsa_username.MaximumLength);
-  if (lsa_username.Buffer) mbstowcs_s(&buflen, lsa_username.Buffer, lsa_username.MaximumLength, username, _TRUNCATE);
-  else {
-    if (policy == &handle) LsaClose(handle);
-    print_message(stderr, NSSM_MESSAGE_OUT_OF_MEMORY, _T("LSA_UNICODE_STRING"), _T("username_sid()"));
-    return 2;
-  }
-#endif
-
-  LSA_REFERENCED_DOMAIN_LIST *translated_domains;
-  LSA_TRANSLATED_SID *translated_sid;
-  NTSTATUS status = LsaLookupNames(*policy, 1, &lsa_username, &translated_domains, &translated_sid);
-#ifndef UNICODE
-  HeapFree(GetProcessHeap(), 0, lsa_username.Buffer);
-#endif
-  if (policy == &handle) LsaClose(handle);
-  if (status) {
-    LsaFreeMemory(translated_domains);
-    LsaFreeMemory(translated_sid);
-    print_message(stderr, NSSM_MESSAGE_LSALOOKUPNAMES_FAILED, username, error_string(LsaNtStatusToWinError(status)));
-    return 3;
-  }
-
-  if (translated_sid->Use != SidTypeUser && translated_sid->Use != SidTypeWellKnownGroup) {
-    LsaFreeMemory(translated_domains);
-    LsaFreeMemory(translated_sid);
-    print_message(stderr, NSSM_GUI_INVALID_USERNAME, username);
-    return 4;
-  }
-
-  LSA_TRUST_INFORMATION *trust = &translated_domains->Domains[translated_sid->DomainIndex];
-  if (! trust || ! IsValidSid(trust->Sid)) {
-    LsaFreeMemory(translated_domains);
-    LsaFreeMemory(translated_sid);
-    print_message(stderr, NSSM_GUI_INVALID_USERNAME, username);
-    return 5;
-  }
-
-  /* GetSidSubAuthority*() return pointers! */
-  unsigned char *n = GetSidSubAuthorityCount(trust->Sid);
-
-  /* Convert translated SID to SID. */
-  *sid = (SID *) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, GetSidLengthRequired(*n + 1));
-  if (! *sid) {
-    LsaFreeMemory(translated_domains);
-    LsaFreeMemory(translated_sid);
-    print_message(stderr, NSSM_MESSAGE_OUT_OF_MEMORY, _T("SID"), _T("grant_logon_as_service"));
-    return 6;
-  }
-
-  unsigned long error;
-  if (! InitializeSid(*sid, GetSidIdentifierAuthority(trust->Sid), *n + 1)) {
-    error = GetLastError();
-    HeapFree(GetProcessHeap(), 0, *sid);
-    LsaFreeMemory(translated_domains);
-    LsaFreeMemory(translated_sid);
-    print_message(stderr, NSSM_MESSAGE_INITIALIZESID_FAILED, username, error_string(error));
-    return 7;
-  }
-
-  for (unsigned char i = 0; i <= *n; i++) {
-    unsigned long *sub = GetSidSubAuthority(*sid, i);
-    if (i < *n) *sub = *GetSidSubAuthority(trust->Sid, i);
-    else *sub = translated_sid->RelativeId;
-  }
-
-  int ret = 0;
-  if (translated_sid->Use == SidTypeWellKnownGroup && ! well_known_sid(*sid)) {
-    print_message(stderr, NSSM_GUI_INVALID_USERNAME, username);
-    ret = 8;
-  }
-
-  LsaFreeMemory(translated_domains);
-  LsaFreeMemory(translated_sid);
-
-  return ret;
-}
-
-int username_sid(const TCHAR *username, SID **sid) {
-  return username_sid(username, sid, 0);
-}
-
-/* Do two usernames map to the same SID? */
-int username_equiv(const TCHAR *a, const TCHAR *b) {
-  SID *sid_a, *sid_b;
-  if (username_sid(a, &sid_a)) return 0;
-
-  if (username_sid(b, &sid_b)) {
-    FreeSid(sid_a);
-    return 0;
-  }
-
-  int ret = 0;
-  if (EqualSid(sid_a, sid_b)) ret = 1;
-
-  FreeSid(sid_a);
-  FreeSid(sid_b);
-
-  return ret;
-}
-
-/* Does the username represent the LocalSystem account? */
-int is_localsystem(const TCHAR *username) {
-  if (str_equiv(username, NSSM_LOCALSYSTEM_ACCOUNT)) return 1;
-  if (! imports.IsWellKnownSid) return 0;
-
-  SID *sid;
-  if (username_sid(username, &sid)) return 0;
-
-  int ret = 0;
-  if (imports.IsWellKnownSid(sid, WinLocalSystemSid)) ret = 1;
-
-  FreeSid(sid);
-
-  return ret;
-}
-
-/*
-  Get well-known alias for LocalSystem and friends.
-  Returns a pointer to a static string.  DO NOT try to free it.
-*/
-const TCHAR *well_known_sid(SID *sid) {
-  if (! imports.IsWellKnownSid) return 0;
-  if (imports.IsWellKnownSid(sid, WinLocalSystemSid)) return NSSM_LOCALSYSTEM_ACCOUNT;
-  if (imports.IsWellKnownSid(sid, WinLocalServiceSid)) return NSSM_LOCALSERVICE_ACCOUNT;
-  if (imports.IsWellKnownSid(sid, WinNetworkServiceSid)) return NSSM_NETWORKSERVICE_ACCOUNT;
-  return 0;
-}
-
-const TCHAR *well_known_username(const TCHAR *username) {
-  if (str_equiv(username, NSSM_LOCALSYSTEM_ACCOUNT)) return NSSM_LOCALSYSTEM_ACCOUNT;
-  SID *sid;
-  int r = username_sid(username, &sid);
-  if (username_sid(username, &sid)) return 0;
-
-  const TCHAR *well_known = well_known_sid(sid);
-  FreeSid(sid);
-
-  return well_known;
-}
-
-int grant_logon_as_service(const TCHAR *username) {
-  if (! username) return 0;
-
-  /* Open Policy object. */
-  LSA_OBJECT_ATTRIBUTES attributes;
-  ZeroMemory(&attributes, sizeof(attributes));
-
-  LSA_HANDLE policy;
-  NTSTATUS status;
-
-  if (open_lsa_policy(&policy)) return 1;
-
-  /* Look up SID for the account. */
-  SID *sid;
-  if (username_sid(username, &sid, &policy)) {
-    LsaClose(policy);
-    return 2;
-  }
-
-  /*
-    Shouldn't happen because it should have been checked before callling this function.
-  */
-  if (well_known_sid(sid)) {
-    LsaClose(policy);
-    return 3;
-  }
-
-  /* Check if the SID has the "Log on as a service" right. */
-  LSA_UNICODE_STRING lsa_right;
-  lsa_right.Buffer = NSSM_LOGON_AS_SERVICE_RIGHT;
-  lsa_right.Length = (unsigned short) wcslen(lsa_right.Buffer) * sizeof(wchar_t);
-  lsa_right.MaximumLength = lsa_right.Length + sizeof(wchar_t);
-
-  LSA_UNICODE_STRING *rights;
-  unsigned long count = ~0;
-  status = LsaEnumerateAccountRights(policy, sid, &rights, &count);
-  if (status) {
-    /*
-      If the account has no rights set LsaEnumerateAccountRights() will return
-      STATUS_OBJECT_NAME_NOT_FOUND and set count to 0.
-    */
-    unsigned long error = LsaNtStatusToWinError(status);
-    if (error != ERROR_FILE_NOT_FOUND) {
-      FreeSid(sid);
-      LsaClose(policy);
-      print_message(stderr, NSSM_MESSAGE_LSAENUMERATEACCOUNTRIGHTS_FAILED, username, error_string(error));
-      return 4;
-    }
-  }
-
-  for (unsigned long i = 0; i < count; i++) {
-    if (rights[i].Length != lsa_right.Length) continue;
-    if (_wcsnicmp(rights[i].Buffer, lsa_right.Buffer, lsa_right.MaximumLength)) continue;
-    /* The SID has the right. */
-    FreeSid(sid);
-    LsaFreeMemory(rights);
-    LsaClose(policy);
-    return 0;
-  }
-  LsaFreeMemory(rights);
-
-  /* Add the right. */
-  status = LsaAddAccountRights(policy, sid, &lsa_right, 1);
-  FreeSid(sid);
-  LsaClose(policy);
-  if (status) {
-    print_message(stderr, NSSM_MESSAGE_LSAADDACCOUNTRIGHTS_FAILED, error_string(LsaNtStatusToWinError(status)));
-    return 5;
-  }
-
-  print_message(stdout, NSSM_MESSAGE_GRANTED_LOGON_AS_SERVICE, username);
-  return 0;
-}
+#include "nssm.h"
+
+#include <sddl.h>
+
+#ifndef STATUS_SUCCESS
+#define STATUS_SUCCESS ERROR_SUCCESS
+#endif
+
+extern imports_t imports;
+
+/* Open Policy object. */
+int open_lsa_policy(LSA_HANDLE *policy) {
+  LSA_OBJECT_ATTRIBUTES attributes;
+  ZeroMemory(&attributes, sizeof(attributes));
+
+  NTSTATUS status = LsaOpenPolicy(0, &attributes, POLICY_ALL_ACCESS, policy);
+  if (status != STATUS_SUCCESS) {
+    print_message(stderr, NSSM_MESSAGE_LSAOPENPOLICY_FAILED, error_string(LsaNtStatusToWinError(status)));
+    return 1;
+  }
+
+  return 0;
+}
+
+/* Look up SID for an account. */
+int username_sid(const TCHAR *username, SID **sid, LSA_HANDLE *policy) {
+  LSA_HANDLE handle;
+  if (! policy) {
+    policy = &handle;
+    if (open_lsa_policy(policy)) return 1;
+  }
+
+  /*
+    LsaLookupNames() can't look up .\username but can look up
+    %COMPUTERNAME%\username.  ChangeServiceConfig() writes .\username to the
+    registry when %COMPUTERNAME%\username is a passed as a parameter.  We
+    need to preserve .\username when calling ChangeServiceConfig() without
+    changing the username, but expand to %COMPUTERNAME%\username when calling
+    LsaLookupNames().
+  */
+  TCHAR *expanded;
+  unsigned long expandedlen;
+  if (_tcsnicmp(_T(".\\"), username, 2)) {
+    expandedlen = (unsigned long) (_tcslen(username) + 1) * sizeof(TCHAR);
+    expanded = (TCHAR *) HeapAlloc(GetProcessHeap(), 0, expandedlen);
+    if (! expanded) {
+      print_message(stderr, NSSM_MESSAGE_OUT_OF_MEMORY, _T("expanded"), _T("username_sid"));
+      if (policy == &handle) LsaClose(handle);
+      return 2;
+    }
+    memmove(expanded, username, expandedlen);
+  }
+  else {
+    TCHAR computername[MAX_COMPUTERNAME_LENGTH + 1];
+    expandedlen = _countof(computername);
+    GetComputerName(computername, &expandedlen);
+    expandedlen += (unsigned long) _tcslen(username);
+
+    expanded = (TCHAR *) HeapAlloc(GetProcessHeap(), 0, expandedlen * sizeof(TCHAR));
+    if (! expanded) {
+      print_message(stderr, NSSM_MESSAGE_OUT_OF_MEMORY, _T("expanded"), _T("username_sid"));
+      if (policy == &handle) LsaClose(handle);
+      return 2;
+    }
+    _sntprintf_s(expanded, expandedlen, _TRUNCATE, _T("%s\\%s"), computername, username + 2);
+  }
+
+  LSA_UNICODE_STRING lsa_username;
+  int ret = to_utf16(expanded, &lsa_username.Buffer, (unsigned long *) &lsa_username.Length);
+  HeapFree(GetProcessHeap(), 0, expanded);
+  if (ret) {
+    if (policy == &handle) LsaClose(handle);
+    print_message(stderr, NSSM_MESSAGE_OUT_OF_MEMORY, _T("LSA_UNICODE_STRING"), _T("username_sid()"));
+    return 4;
+  }
+  lsa_username.Length *= sizeof(wchar_t);
+  lsa_username.MaximumLength = lsa_username.Length + sizeof(wchar_t);
+
+  LSA_REFERENCED_DOMAIN_LIST *translated_domains;
+  LSA_TRANSLATED_SID *translated_sid;
+  NTSTATUS status = LsaLookupNames(*policy, 1, &lsa_username, &translated_domains, &translated_sid);
+  HeapFree(GetProcessHeap(), 0, lsa_username.Buffer);
+  if (policy == &handle) LsaClose(handle);
+  if (status != STATUS_SUCCESS) {
+    LsaFreeMemory(translated_domains);
+    LsaFreeMemory(translated_sid);
+    print_message(stderr, NSSM_MESSAGE_LSALOOKUPNAMES_FAILED, username, error_string(LsaNtStatusToWinError(status)));
+    return 5;
+  }
+
+  if (translated_sid->Use != SidTypeUser && translated_sid->Use != SidTypeWellKnownGroup) {
+    if (translated_sid->Use != SidTypeUnknown || _tcsnicmp(NSSM_VIRTUAL_SERVICE_ACCOUNT_DOMAIN _T("\\"), username, _tcslen(NSSM_VIRTUAL_SERVICE_ACCOUNT_DOMAIN) + 1)) {
+      LsaFreeMemory(translated_domains);
+      LsaFreeMemory(translated_sid);
+      print_message(stderr, NSSM_GUI_INVALID_USERNAME, username);
+      return 6;
+    }
+  }
+
+  LSA_TRUST_INFORMATION *trust = &translated_domains->Domains[translated_sid->DomainIndex];
+  if (! trust || ! IsValidSid(trust->Sid)) {
+    LsaFreeMemory(translated_domains);
+    LsaFreeMemory(translated_sid);
+    print_message(stderr, NSSM_GUI_INVALID_USERNAME, username);
+    return 7;
+  }
+
+  /* GetSidSubAuthority*() return pointers! */
+  unsigned char *n = GetSidSubAuthorityCount(trust->Sid);
+
+  /* Convert translated SID to SID. */
+  *sid = (SID *) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, GetSidLengthRequired(*n + 1));
+  if (! *sid) {
+    LsaFreeMemory(translated_domains);
+    LsaFreeMemory(translated_sid);
+    print_message(stderr, NSSM_MESSAGE_OUT_OF_MEMORY, _T("SID"), _T("username_sid"));
+    return 8;
+  }
+
+  unsigned long error;
+  if (! InitializeSid(*sid, GetSidIdentifierAuthority(trust->Sid), *n + 1)) {
+    error = GetLastError();
+    HeapFree(GetProcessHeap(), 0, *sid);
+    LsaFreeMemory(translated_domains);
+    LsaFreeMemory(translated_sid);
+    print_message(stderr, NSSM_MESSAGE_INITIALIZESID_FAILED, username, error_string(error));
+    return 9;
+  }
+
+  for (unsigned char i = 0; i <= *n; i++) {
+    unsigned long *sub = GetSidSubAuthority(*sid, i);
+    if (i < *n) *sub = *GetSidSubAuthority(trust->Sid, i);
+    else *sub = translated_sid->RelativeId;
+  }
+
+  ret = 0;
+  if (translated_sid->Use == SidTypeWellKnownGroup && ! well_known_sid(*sid)) {
+    print_message(stderr, NSSM_GUI_INVALID_USERNAME, username);
+    ret = 10;
+  }
+
+  LsaFreeMemory(translated_domains);
+  LsaFreeMemory(translated_sid);
+
+  return ret;
+}
+
+int username_sid(const TCHAR *username, SID **sid) {
+  return username_sid(username, sid, 0);
+}
+
+int canonicalise_username(const TCHAR *username, TCHAR **canon) {
+  LSA_HANDLE policy;
+  if (open_lsa_policy(&policy)) return 1;
+
+  SID *sid;
+  if (username_sid(username, &sid, &policy)) return 2;
+  PSID sids = { sid };
+
+  LSA_REFERENCED_DOMAIN_LIST *translated_domains;
+  LSA_TRANSLATED_NAME *translated_name;
+  NTSTATUS status = LsaLookupSids(policy, 1, &sids, &translated_domains, &translated_name);
+  if (status != STATUS_SUCCESS) {
+    LsaFreeMemory(translated_domains);
+    LsaFreeMemory(translated_name);
+    print_message(stderr, NSSM_MESSAGE_LSALOOKUPSIDS_FAILED, error_string(LsaNtStatusToWinError(status)));
+    return 3;
+  }
+
+  LSA_TRUST_INFORMATION *trust = &translated_domains->Domains[translated_name->DomainIndex];
+  LSA_UNICODE_STRING lsa_canon;
+  lsa_canon.Length = translated_name->Name.Length + trust->Name.Length + sizeof(wchar_t);
+  lsa_canon.MaximumLength = lsa_canon.Length + sizeof(wchar_t);
+  lsa_canon.Buffer = (wchar_t *) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, lsa_canon.MaximumLength);
+  if (! lsa_canon.Buffer) {
+    LsaFreeMemory(translated_domains);
+    LsaFreeMemory(translated_name);
+    print_message(stderr, NSSM_MESSAGE_OUT_OF_MEMORY, _T("lsa_canon"), _T("username_sid"));
+    return 9;
+  }
+
+  /* Buffer is wchar_t but Length is in bytes. */
+  memmove((char *) lsa_canon.Buffer, trust->Name.Buffer, trust->Name.Length);
+  memmove((char *) lsa_canon.Buffer + trust->Name.Length, L"\\", sizeof(wchar_t));
+  memmove((char *) lsa_canon.Buffer + trust->Name.Length + sizeof(wchar_t), translated_name->Name.Buffer, translated_name->Name.Length);
+
+  unsigned long canonlen;
+  if (from_utf16(lsa_canon.Buffer, canon, &canonlen)) {
+    LsaFreeMemory(translated_domains);
+    LsaFreeMemory(translated_name);
+    print_message(stderr, NSSM_MESSAGE_OUT_OF_MEMORY, _T("canon"), _T("username_sid"));
+    return 10;
+  }
+  HeapFree(GetProcessHeap(), 0, lsa_canon.Buffer);
+
+  LsaFreeMemory(translated_domains);
+  LsaFreeMemory(translated_name);
+
+  return 0;
+}
+
+/* Do two usernames map to the same SID? */
+int username_equiv(const TCHAR *a, const TCHAR *b) {
+  SID *sid_a, *sid_b;
+  if (username_sid(a, &sid_a)) return 0;
+
+  if (username_sid(b, &sid_b)) {
+    FreeSid(sid_a);
+    return 0;
+  }
+
+  int ret = 0;
+  if (EqualSid(sid_a, sid_b)) ret = 1;
+
+  FreeSid(sid_a);
+  FreeSid(sid_b);
+
+  return ret;
+}
+
+/* Does the username represent the LocalSystem account? */
+int is_localsystem(const TCHAR *username) {
+  if (str_equiv(username, NSSM_LOCALSYSTEM_ACCOUNT)) return 1;
+  if (! imports.IsWellKnownSid) return 0;
+
+  SID *sid;
+  if (username_sid(username, &sid)) return 0;
+
+  int ret = 0;
+  if (imports.IsWellKnownSid(sid, WinLocalSystemSid)) ret = 1;
+
+  FreeSid(sid);
+
+  return ret;
+}
+
+/* Build the virtual account name. */
+TCHAR *virtual_account(const TCHAR *service_name) {
+  size_t len = _tcslen(NSSM_VIRTUAL_SERVICE_ACCOUNT_DOMAIN) + _tcslen(service_name) + 2;
+  TCHAR *name = (TCHAR *) HeapAlloc(GetProcessHeap(), 0, len * sizeof(TCHAR));
+  if (! name) {
+    print_message(stderr, NSSM_MESSAGE_OUT_OF_MEMORY, _T("name"), _T("virtual_account"));
+    return 0;
+  }
+
+  _sntprintf_s(name, len, _TRUNCATE, _T("%s\\%s"), NSSM_VIRTUAL_SERVICE_ACCOUNT_DOMAIN, service_name);
+  return name;
+}
+
+/* Does the username represent a virtual account for the service? */
+int is_virtual_account(const TCHAR *service_name, const TCHAR *username) {
+  if (! imports.IsWellKnownSid) return 0;
+  if (! service_name) return 0;
+  if (! username) return 0;
+
+  TCHAR *canon = virtual_account(service_name);
+  int ret = str_equiv(canon, username);
+  HeapFree(GetProcessHeap(), 0, canon);
+  return ret;
+}
+
+/*
+  Get well-known alias for LocalSystem and friends.
+  Returns a pointer to a static string.  DO NOT try to free it.
+*/
+const TCHAR *well_known_sid(SID *sid) {
+  if (! imports.IsWellKnownSid) return 0;
+  if (imports.IsWellKnownSid(sid, WinLocalSystemSid)) return NSSM_LOCALSYSTEM_ACCOUNT;
+  if (imports.IsWellKnownSid(sid, WinLocalServiceSid)) return NSSM_LOCALSERVICE_ACCOUNT;
+  if (imports.IsWellKnownSid(sid, WinNetworkServiceSid)) return NSSM_NETWORKSERVICE_ACCOUNT;
+  return 0;
+}
+
+const TCHAR *well_known_username(const TCHAR *username) {
+  if (! username) return NSSM_LOCALSYSTEM_ACCOUNT;
+  if (str_equiv(username, NSSM_LOCALSYSTEM_ACCOUNT)) return NSSM_LOCALSYSTEM_ACCOUNT;
+  SID *sid;
+  if (username_sid(username, &sid)) return 0;
+
+  const TCHAR *well_known = well_known_sid(sid);
+  FreeSid(sid);
+
+  return well_known;
+}
+
+int grant_logon_as_service(const TCHAR *username) {
+  if (! username) return 0;
+
+  /* Open Policy object. */
+  LSA_OBJECT_ATTRIBUTES attributes;
+  ZeroMemory(&attributes, sizeof(attributes));
+
+  LSA_HANDLE policy;
+  NTSTATUS status;
+
+  if (open_lsa_policy(&policy)) return 1;
+
+  /* Look up SID for the account. */
+  SID *sid;
+  if (username_sid(username, &sid, &policy)) {
+    LsaClose(policy);
+    return 2;
+  }
+
+  /*
+    Shouldn't happen because it should have been checked before callling this function.
+  */
+  if (well_known_sid(sid)) {
+    LsaClose(policy);
+    return 3;
+  }
+
+  /* Check if the SID has the "Log on as a service" right. */
+  LSA_UNICODE_STRING lsa_right;
+  lsa_right.Buffer = NSSM_LOGON_AS_SERVICE_RIGHT;
+  lsa_right.Length = (unsigned short) wcslen(lsa_right.Buffer) * sizeof(wchar_t);
+  lsa_right.MaximumLength = lsa_right.Length + sizeof(wchar_t);
+
+  LSA_UNICODE_STRING *rights;
+  unsigned long count = ~0;
+  status = LsaEnumerateAccountRights(policy, sid, &rights, &count);
+  if (status != STATUS_SUCCESS) {
+    /*
+      If the account has no rights set LsaEnumerateAccountRights() will return
+      STATUS_OBJECT_NAME_NOT_FOUND and set count to 0.
+    */
+    unsigned long error = LsaNtStatusToWinError(status);
+    if (error != ERROR_FILE_NOT_FOUND) {
+      FreeSid(sid);
+      LsaClose(policy);
+      print_message(stderr, NSSM_MESSAGE_LSAENUMERATEACCOUNTRIGHTS_FAILED, username, error_string(error));
+      return 4;
+    }
+  }
+
+  for (unsigned long i = 0; i < count; i++) {
+    if (rights[i].Length != lsa_right.Length) continue;
+    if (_wcsnicmp(rights[i].Buffer, lsa_right.Buffer, lsa_right.MaximumLength)) continue;
+    /* The SID has the right. */
+    FreeSid(sid);
+    LsaFreeMemory(rights);
+    LsaClose(policy);
+    return 0;
+  }
+  LsaFreeMemory(rights);
+
+  /* Add the right. */
+  status = LsaAddAccountRights(policy, sid, &lsa_right, 1);
+  FreeSid(sid);
+  LsaClose(policy);
+  if (status != STATUS_SUCCESS) {
+    print_message(stderr, NSSM_MESSAGE_LSAADDACCOUNTRIGHTS_FAILED, error_string(LsaNtStatusToWinError(status)));
+    return 5;
+  }
+
+  print_message(stdout, NSSM_MESSAGE_GRANTED_LOGON_AS_SERVICE, username);
+  return 0;
+}