function tests two security-identifier (SID) prefix values for equality. A
SID prefix is the entire SID except for the last subauthority value.
| PSID pSid1,
||// pointer to first SID to compare
| PSID pSid2
||// pointer to second SID to compare
Points to the first SID
structure to compare. This structure is assumed to be valid.
Points to the second SID
structure to compare. It also is assumed to be valid.
If the SID prefixes are equal, the return value is nonzero.
If the SID prefixes are not equal, the return value is zero. To get extended
error information, call GetLastError
function enables a server application in one domain to verify an attempt by a
user to log on to another domain. For example, if a user attempts to log on to
RemoteDomain from a workstation in LocalDomain, the server for LocalDomain can
request the SIDs for the user and the user's groups from RemoteDomain. The
domain controller for RemoteDomain responds with the relevant SIDs.
All SIDs for a specified domain necessarily have the same prefix. When the
server receives the user's SIDs, it can call the EqualPrefixSid
function for each SID, comparing the user or group SID against the SID for
RemoteDomain. If any of the SID prefixes are not equal, the server refuses the
It is advisable to modify the SID for a domain before comparing it with a
group or user SID. If the SID for RemoteDomain is S-1
8, each group or user SID for that domain will have S-1
8 as its prefix. To compare the SIDs by using the EqualPrefixSid
function, an application copies the domain SID and adds any subauthority
(RID) value to the copy, thereby creating a SID in the form S-1
0. The application then uses the modified domain SID as a template against
which the group and user SIDs are compared.
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