diff options
Diffstat (limited to 'source/nsswitch/winbindd_sid.c')
| -rw-r--r-- | source/nsswitch/winbindd_sid.c | 85 |
1 files changed, 81 insertions, 4 deletions
diff --git a/source/nsswitch/winbindd_sid.c b/source/nsswitch/winbindd_sid.c index 13b2cd05550..a40d35c5820 100644 --- a/source/nsswitch/winbindd_sid.c +++ b/source/nsswitch/winbindd_sid.c @@ -183,6 +183,40 @@ static void sid2uid_recv(void *private_data, BOOL success, uid_t uid) request_ok(state); } +static void sid2uid_lookupsid_recv( void *private_data, BOOL success, + const char *domain_name, + const char *name, + enum lsa_SidType type) +{ + struct winbindd_cli_state *state = + talloc_get_type_abort(private_data, struct winbindd_cli_state); + DOM_SID sid; + + if (!success) { + DEBUG(5, ("sid2uid_lookupsid_recv Could not convert get sid type for %s\n", + state->request.data.sid)); + request_error(state); + return; + } + + if ( (type!=SID_NAME_USER) || (type!=SID_NAME_COMPUTER) ) { + DEBUG(5,("sid2uid_lookupsid_recv: Sid %s is not a user or a computer.\n", + state->request.data.sid)); + request_error(state); + return; + } + + if (!string_to_sid(&sid, state->request.data.sid)) { + DEBUG(1, ("sid2uid_lookupsid_recv: Could not get convert sid %s from string\n", + state->request.data.sid)); + request_error(state); + return; + } + + /* always use the async interface (may block) */ + winbindd_sid2uid_async(state->mem_ctx, &sid, sid2uid_recv, state); +} + void winbindd_sid_to_uid(struct winbindd_cli_state *state) { DOM_SID sid; @@ -200,8 +234,11 @@ void winbindd_sid_to_uid(struct winbindd_cli_state *state) return; } - /* always use the async interface (may block) */ - winbindd_sid2uid_async(state->mem_ctx, &sid, sid2uid_recv, state); + /* Validate the SID as a user. Hopefully this will hit cache. + Needed to prevent DoS by exhausting the uid allocation + range from random SIDs. */ + + winbindd_lookupsid_async( state->mem_ctx, &sid, sid2uid_lookupsid_recv, state ); } /* Convert a sid to a gid. We assume we only have one rid attached to the @@ -223,6 +260,43 @@ static void sid2gid_recv(void *private_data, BOOL success, gid_t gid) request_ok(state); } +static void sid2gid_lookupsid_recv( void *private_data, BOOL success, + const char *domain_name, + const char *name, + enum lsa_SidType type) +{ + struct winbindd_cli_state *state = + talloc_get_type_abort(private_data, struct winbindd_cli_state); + DOM_SID sid; + + if (!success) { + DEBUG(5, ("sid2gid_lookupsid_recv: Could not convert get sid type for %s\n", + state->request.data.sid)); + request_error(state); + return; + } + + if ( (type!=SID_NAME_DOM_GRP) || + (type!=SID_NAME_ALIAS) || + (type!=SID_NAME_WKN_GRP) ) + { + DEBUG(5,("sid2gid_lookupsid_recv: Sid %s is not a group.\n", + state->request.data.sid)); + request_error(state); + return; + } + + if (!string_to_sid(&sid, state->request.data.sid)) { + DEBUG(1, ("sid2gid_lookupsid_recv: Could not get convert sid %s from string\n", + state->request.data.sid)); + request_error(state); + return; + } + + /* always use the async interface (may block) */ + winbindd_sid2gid_async(state->mem_ctx, &sid, sid2gid_recv, state); +} + void winbindd_sid_to_gid(struct winbindd_cli_state *state) { DOM_SID sid; @@ -240,8 +314,11 @@ void winbindd_sid_to_gid(struct winbindd_cli_state *state) return; } - /* always use the async interface (may block) */ - winbindd_sid2gid_async(state->mem_ctx, &sid, sid2gid_recv, state); + /* Validate the SID as a group. Hopefully this will hit cache. + Needed to prevent DoS by exhausting the uid allocation + range from random SIDs. */ + + winbindd_lookupsid_async( state->mem_ctx, &sid, sid2gid_lookupsid_recv, state ); } static void sids2xids_recv(void *private_data, BOOL success, void *data, int len) |