diff --git a/reactos/dll/win32/samlib/samlib.c b/reactos/dll/win32/samlib/samlib.c
index 8c52b49c069..27f9bed73cc 100644
--- a/reactos/dll/win32/samlib/samlib.c
+++ b/reactos/dll/win32/samlib/samlib.c
@@ -380,6 +380,62 @@ SamCreateUserInDomain(IN SAM_HANDLE DomainHandle,
 }
 
 
+NTSTATUS
+NTAPI
+SamDeleteAlias(IN SAM_HANDLE AliasHandle)
+{
+    SAMPR_HANDLE LocalAliasHandle;
+    NTSTATUS Status;
+
+    TRACE("SamDeleteAlias(%p)\n", AliasHandle);
+
+    LocalAliasHandle = (SAMPR_HANDLE)AliasHandle;
+
+    if (LocalAliasHandle == NULL)
+        return STATUS_INVALID_HANDLE;
+
+    RpcTryExcept
+    {
+        Status = SamrDeleteAlias(&LocalAliasHandle);
+    }
+    RpcExcept(EXCEPTION_EXECUTE_HANDLER)
+    {
+        Status = I_RpcMapWin32Status(RpcExceptionCode());
+    }
+    RpcEndExcept;
+
+    return Status;
+}
+
+
+NTSTATUS
+NTAPI
+SamDeleteGroup(IN SAM_HANDLE GroupHandle)
+{
+    SAMPR_HANDLE LocalGroupHandle;
+    NTSTATUS Status;
+
+    TRACE("SamDeleteGroup(%p)\n", GroupHandle);
+
+    LocalGroupHandle = (SAMPR_HANDLE)GroupHandle;
+
+    if (LocalGroupHandle == NULL)
+        return STATUS_INVALID_HANDLE;
+
+    RpcTryExcept
+    {
+        Status = SamrDeleteGroup(&LocalGroupHandle);
+    }
+    RpcExcept(EXCEPTION_EXECUTE_HANDLER)
+    {
+        Status = I_RpcMapWin32Status(RpcExceptionCode());
+    }
+    RpcEndExcept;
+
+    return Status;
+}
+
+
 NTSTATUS
 NTAPI
 SamDeleteUser(IN SAM_HANDLE UserHandle)
@@ -665,6 +721,50 @@ SamGetAliasMembership(IN SAM_HANDLE DomainHandle,
 }
 
 
+NTSTATUS
+NTAPI
+SamGetGroupsForUser(IN SAM_HANDLE UserHandle,
+                    OUT PGROUP_MEMBERSHIP *Groups,
+                    OUT PULONG MembershipCount)
+{
+    PSAMPR_GET_GROUPS_BUFFER GroupsBuffer = NULL;
+    NTSTATUS Status;
+
+    TRACE("SamGetGroupsForUser(%p %p %p)\n",
+          UserHandle, Groups, MembershipCount);
+
+    RpcTryExcept
+    {
+        Status = SamrGetGroupsForUser((SAMPR_HANDLE)UserHandle,
+                                      &GroupsBuffer);
+        if (NT_SUCCESS(Status))
+        {
+            *Groups = GroupsBuffer->Groups;
+            *MembershipCount = GroupsBuffer->MembershipCount;
+
+            MIDL_user_free(GroupsBuffer);
+        }
+        else
+        {
+            if (GroupsBuffer != NULL)
+            {
+                if (GroupsBuffer->Groups != NULL)
+                    MIDL_user_free(GroupsBuffer->Groups);
+
+                MIDL_user_free(GroupsBuffer);
+            }
+        }
+    }
+    RpcExcept(EXCEPTION_EXECUTE_HANDLER)
+    {
+        Status = I_RpcMapWin32Status(RpcExceptionCode());
+    }
+    RpcEndExcept;
+
+    return Status;
+}
+
+
 NTSTATUS
 NTAPI
 SamGetMembersInAlias(IN SAM_HANDLE AliasHandle,
@@ -707,6 +807,55 @@ SamGetMembersInAlias(IN SAM_HANDLE AliasHandle,
 }
 
 
+NTSTATUS
+NTAPI
+SamGetMembersInGroup(IN SAM_HANDLE GroupHandle,
+                     OUT PULONG *MemberIds,
+                     OUT PULONG *Attributes,
+                     OUT PULONG MemberCount)
+{
+    PSAMPR_GET_MEMBERS_BUFFER MembersBuffer = NULL;
+    NTSTATUS Status;
+
+    TRACE("SamGetMembersInGroup(%p %p %p %p)\n",
+          GroupHandle, MemberIds, Attributes, MemberCount);
+
+    RpcTryExcept
+    {
+        Status = SamrGetMembersInGroup((SAMPR_HANDLE)GroupHandle,
+                                       &MembersBuffer);
+        if (NT_SUCCESS(Status))
+        {
+            *MemberIds = MembersBuffer->Members;
+            *Attributes = MembersBuffer->Attributes;
+            *MemberCount = MembersBuffer->MemberCount;
+
+            MIDL_user_free(MembersBuffer);
+        }
+        else
+        {
+            if (MembersBuffer != NULL)
+            {
+                if (MembersBuffer->Members != NULL)
+                    MIDL_user_free(MembersBuffer->Members);
+
+                if (MembersBuffer->Attributes != NULL)
+                    MIDL_user_free(MembersBuffer->Attributes);
+
+                MIDL_user_free(MembersBuffer);
+            }
+        }
+    }
+    RpcExcept(EXCEPTION_EXECUTE_HANDLER)
+    {
+        Status = I_RpcMapWin32Status(RpcExceptionCode());
+    }
+    RpcEndExcept;
+
+    return Status;
+}
+
+
 NTSTATUS
 NTAPI
 SamLookupDomainInSamServer(IN SAM_HANDLE ServerHandle,
@@ -1145,6 +1294,53 @@ SamQueryInformationUser(IN SAM_HANDLE UserHandle,
 }
 
 
+NTSTATUS
+NTAPI
+SamQuerySecurityObject(IN SAM_HANDLE ObjectHandle,
+                       IN SECURITY_INFORMATION SecurityInformation,
+                       OUT PSECURITY_DESCRIPTOR *SecurityDescriptor)
+{
+    SAMPR_SR_SECURITY_DESCRIPTOR LocalSecurityDescriptor;
+    PSAMPR_SR_SECURITY_DESCRIPTOR pLocalSecurityDescriptor;
+    NTSTATUS Status;
+
+    TRACE("SamQuerySecurityObject(%p %lu %p)\n",
+          ObjectHandle, SecurityInformation, SecurityDescriptor);
+
+    LocalSecurityDescriptor.Length = 0;
+    LocalSecurityDescriptor.SecurityDescriptor = NULL;
+
+    RpcTryExcept
+    {
+        pLocalSecurityDescriptor = &LocalSecurityDescriptor;
+
+        Status = SamrQuerySecurityObject((SAMPR_HANDLE)ObjectHandle,
+                                         SecurityInformation,
+                                         &pLocalSecurityDescriptor);
+    }
+    RpcExcept(EXCEPTION_EXECUTE_HANDLER)
+    {
+        Status = I_RpcMapWin32Status(RpcExceptionCode());
+    }
+    RpcEndExcept;
+
+    *SecurityDescriptor = LocalSecurityDescriptor.SecurityDescriptor;
+
+    return Status;
+}
+
+
+NTSTATUS
+NTAPI
+SamRidToSid(IN SAM_HANDLE ObjectHandle,
+            IN ULONG Rid,
+            OUT PSID *Sid)
+{
+    UNIMPLEMENTED;
+    return STATUS_NOT_IMPLEMENTED;
+}
+
+
 NTSTATUS
 NTAPI
 SamSetInformationAlias(IN SAM_HANDLE AliasHandle,
@@ -1253,6 +1449,88 @@ SamSetInformationUser(IN SAM_HANDLE UserHandle,
 }
 
 
+NTSTATUS
+NTAPI
+SamSetMemberAttributesOfGroup(IN SAM_HANDLE GroupHandle,
+                              IN ULONG MemberId,
+                              IN ULONG Attributes)
+{
+    NTSTATUS Status;
+
+    TRACE("SamSetMemberAttributesOfGroup(%p %lu 0x%lx)\n",
+          GroupHandle, MemberId, Attributes);
+
+    RpcTryExcept
+    {
+        Status = SamrSetMemberAttributesOfGroup((SAMPR_HANDLE)GroupHandle,
+                                                MemberId,
+                                                Attributes);
+    }
+    RpcExcept(EXCEPTION_EXECUTE_HANDLER)
+    {
+        Status = I_RpcMapWin32Status(RpcExceptionCode());
+    }
+    RpcEndExcept;
+
+    return Status;
+}
+
+
+NTSTATUS
+NTAPI
+SamSetSecurityObject(IN SAM_HANDLE ObjectHandle,
+                     IN SECURITY_INFORMATION SecurityInformation,
+                     IN PSECURITY_DESCRIPTOR SecurityDescriptor)
+{
+    SAMPR_SR_SECURITY_DESCRIPTOR DescriptorToPass;
+    ULONG Length;
+    NTSTATUS Status;
+
+    TRACE("SamSetSecurityObject(%p %lu %p)\n",
+          ObjectHandle, SecurityInformation, SecurityDescriptor);
+
+    /* Retrieve the length of the relative security descriptor */
+    Length = 0;
+    Status = RtlMakeSelfRelativeSD(SecurityDescriptor,
+                                   NULL,
+                                   &Length);
+    if (Status != STATUS_BUFFER_TOO_SMALL)
+        return STATUS_INVALID_PARAMETER;
+
+
+    /* Allocate a buffer for the security descriptor */
+    DescriptorToPass.Length = Length;
+    DescriptorToPass.SecurityDescriptor = MIDL_user_allocate(Length);
+    if (DescriptorToPass.SecurityDescriptor == NULL)
+        return STATUS_INSUFFICIENT_RESOURCES;
+
+    /* Convert the given security descriptor to a relative security descriptor */
+    Status = RtlMakeSelfRelativeSD(SecurityDescriptor,
+                                   (PSECURITY_DESCRIPTOR)DescriptorToPass.SecurityDescriptor,
+                                   &Length);
+    if (!NT_SUCCESS(Status))
+        goto done;
+
+    RpcTryExcept
+    {
+        Status = SamrSetSecurityObject((SAMPR_HANDLE)ObjectHandle,
+                                       SecurityInformation,
+                                       &DescriptorToPass);
+    }
+    RpcExcept(EXCEPTION_EXECUTE_HANDLER)
+    {
+        Status = I_RpcMapWin32Status(RpcExceptionCode());
+    }
+    RpcEndExcept;
+
+done:
+    if (DescriptorToPass.SecurityDescriptor != NULL)
+        MIDL_user_free(DescriptorToPass.SecurityDescriptor);
+
+    return Status;
+}
+
+
 NTSTATUS
 NTAPI
 SamShutdownSamServer(IN SAM_HANDLE ServerHandle)
diff --git a/reactos/dll/win32/samlib/samlib.spec b/reactos/dll/win32/samlib/samlib.spec
index 749afc89bac..e63ae9265e4 100644
--- a/reactos/dll/win32/samlib/samlib.spec
+++ b/reactos/dll/win32/samlib/samlib.spec
@@ -11,8 +11,8 @@
 @ stdcall SamCreateGroupInDomain(ptr ptr long ptr ptr)
 @ stdcall SamCreateUser2InDomain(ptr ptr long long ptr ptr ptr)
 @ stdcall SamCreateUserInDomain(ptr ptr long ptr ptr)
-@ stub SamDeleteAlias
-@ stub SamDeleteGroup
+@ stdcall SamDeleteAlias(ptr)
+@ stdcall SamDeleteGroup(ptr)
 @ stdcall SamDeleteUser(ptr)
 @ stdcall SamEnumerateAliasesInDomain(ptr ptr ptr long ptr)
 @ stdcall SamEnumerateDomainsInSamServer(ptr ptr ptr long ptr)
@@ -22,9 +22,9 @@
 @ stdcall SamGetAliasMembership(ptr long ptr ptr ptr)
 @ stub SamGetCompatibilityMode
 @ stub SamGetDisplayEnumerationIndex
-@ stub SamGetGroupsForUser
+@ stdcall SamGetGroupsForUser(ptr ptr ptr)
 @ stdcall SamGetMembersInAlias(ptr ptr ptr)
-@ stub SamGetMembersInGroup
+@ stdcall SamGetMembersInGroup(ptr ptr ptr ptr)
 @ stdcall SamLookupDomainInSamServer(ptr ptr ptr)
 @ stdcall SamLookupIdsInDomain(ptr long ptr ptr ptr)
 @ stdcall SamLookupNamesInDomain(ptr long ptr ptr ptr)
@@ -37,18 +37,18 @@
 @ stdcall SamQueryInformationDomain(ptr long ptr)
 @ stdcall SamQueryInformationGroup(ptr long ptr)
 @ stdcall SamQueryInformationUser(ptr long ptr)
-@ stub SamQuerySecurityObject
+@ stdcall SamQuerySecurityObject(ptr long ptr)
 @ stub SamRemoveMemberFromAlias
 @ stub SamRemoveMemberFromForeignDomain
 @ stub SamRemoveMemberFromGroup
 @ stub SamRemoveMultipleMembersFromAlias
-@ stub SamRidToSid
+@ stdcall SamRidToSid(ptr long ptr)
 @ stdcall SamSetInformationAlias(ptr long ptr)
 @ stdcall SamSetInformationDomain(ptr long ptr)
 @ stdcall SamSetInformationGroup(ptr long ptr)
 @ stdcall SamSetInformationUser(ptr long ptr)
-@ stub SamSetMemberAttributesOfGroup
-@ stub SamSetSecurityObject
+@ stdcall SamSetMemberAttributesOfGroup(ptr long long)
+@ stdcall SamSetSecurityObject(ptr long ptr)
 @ stdcall SamShutdownSamServer(ptr)
 @ stub SamTestPrivateFunctionsDomain
 @ stub SamTestPrivateFunctionsUser
diff --git a/reactos/include/ddk/ntsam.h b/reactos/include/ddk/ntsam.h
index 00918739977..00412624e8f 100644
--- a/reactos/include/ddk/ntsam.h
+++ b/reactos/include/ddk/ntsam.h
@@ -271,6 +271,12 @@ typedef enum _GROUP_INFORMATION_CLASS
     GroupReplicationInformation
 } GROUP_INFORMATION_CLASS;
 
+typedef struct _GROUP_MEMBERSHIP
+{
+    ULONG RelativeId;
+    ULONG Attributes;
+} GROUP_MEMBERSHIP, *PGROUP_MEMBERSHIP;
+
 typedef enum _USER_INFORMATION_CLASS
 {
     UserGeneralInformation = 1,
@@ -373,6 +379,14 @@ SamCreateUserInDomain(IN SAM_HANDLE DomainHandle,
                       OUT PSAM_HANDLE UserHandle,
                       OUT PULONG RelativeId);
 
+NTSTATUS
+NTAPI
+SamDeleteAlias(IN SAM_HANDLE AliasHandle);
+
+NTSTATUS
+NTAPI
+SamDeleteGroup(IN SAM_HANDLE GroupHandle);
+
 NTSTATUS
 NTAPI
 SamDeleteUser(IN SAM_HANDLE UserHandle);
@@ -422,12 +436,25 @@ SamGetAliasMembership(IN SAM_HANDLE DomainHandle,
                       OUT PULONG MembershipCount,
                       OUT PULONG *Aliases);
 
+NTSTATUS
+NTAPI
+SamGetGroupsForUser(IN SAM_HANDLE UserHandle,
+                    OUT PGROUP_MEMBERSHIP *Groups,
+                    OUT PULONG MembershipCount);
+
 NTSTATUS
 NTAPI
 SamGetMembersInAlias(IN SAM_HANDLE AliasHandle,
                      OUT PSID **MemberIds,
                      OUT PULONG MemberCount);
 
+NTSTATUS
+NTAPI
+SamGetMembersInGroup(IN SAM_HANDLE GroupHandle,
+                     OUT PULONG *MemberIds,
+                     OUT PULONG *Attributes,
+                     OUT PULONG MemberCount);
+
 NTSTATUS
 NTAPI
 SamLookupDomainInSamServer(IN SAM_HANDLE ServerHandle,
@@ -502,11 +529,23 @@ SamQueryInformationUser(IN SAM_HANDLE UserHandle,
                         IN USER_INFORMATION_CLASS UserInformationClass,
                         OUT PVOID *Buffer);
 
+NTSTATUS
+NTAPI
+SamQuerySecurityObject(IN SAM_HANDLE ObjectHandle,
+                       IN SECURITY_INFORMATION SecurityInformation,
+                       OUT PSECURITY_DESCRIPTOR *SecurityDescriptor);
+
 NTSTATUS
 NTAPI
 SamRemoveMemberFromAlias(IN SAM_HANDLE AliasHandle,
                          IN PSID MemberId);
 
+NTSTATUS
+NTAPI
+SamRidToSid(IN SAM_HANDLE ObjectHandle,
+            IN ULONG Rid,
+            OUT PSID *Sid);
+
 NTSTATUS
 NTAPI
 SamSetInformationAlias(IN SAM_HANDLE AliasHandle,
@@ -531,6 +570,18 @@ SamSetInformationUser(IN SAM_HANDLE UserHandle,
                       IN USER_INFORMATION_CLASS UserInformationClass,
                       IN PVOID Buffer);
 
+NTSTATUS
+NTAPI
+SamSetMemberAttributesOfGroup(IN SAM_HANDLE GroupHandle,
+                              IN ULONG MemberId,
+                              IN ULONG Attributes);
+
+NTSTATUS
+NTAPI
+SamSetSecurityObject(IN SAM_HANDLE ObjectHandle,
+                     IN SECURITY_INFORMATION SecurityInformation,
+                     IN PSECURITY_DESCRIPTOR SecurityDescriptor);
+
 NTSTATUS
 NTAPI
 SamShutdownSamServer(IN SAM_HANDLE ServerHandle);
diff --git a/reactos/include/reactos/idl/sam.idl b/reactos/include/reactos/idl/sam.idl
index 3ff5467f808..96f1640ec94 100644
--- a/reactos/include/reactos/idl/sam.idl
+++ b/reactos/include/reactos/idl/sam.idl
@@ -99,11 +99,13 @@ typedef struct _SAMPR_SR_SECURITY_DESCRIPTOR
     [size_is(Length)] unsigned char* SecurityDescriptor;
 } SAMPR_SR_SECURITY_DESCRIPTOR, *PSAMPR_SR_SECURITY_DESCRIPTOR;
 
+cpp_quote("#ifndef _NTSAM_")
 typedef struct _GROUP_MEMBERSHIP
 {
     unsigned long RelativeId;
     unsigned long Attributes;
 } GROUP_MEMBERSHIP, *PGROUP_MEMBERSHIP;
+cpp_quote("#endif")
 
 typedef struct _SAMPR_GET_GROUPS_BUFFER
 {