From a9acb1346b00db5b9c8705376e76e860d292faba Mon Sep 17 00:00:00 2001 From: Andy Zaugg Date: Tue, 14 Oct 2025 17:50:11 +0000 Subject: [PATCH 1/2] Backported samba netlog fixes Windows server security update 2025 patched CVE-2025-49716, which broke samba authentication. Backporting fix from upstream to address. --- SPECS-EXTENDED/samba/0002-CVE-2025-49716-netlogon.patch | 0 SPECS-EXTENDED/samba/samba.spec | 6 +++++- 2 files changed, 5 insertions(+), 1 deletion(-) create mode 100644 SPECS-EXTENDED/samba/0002-CVE-2025-49716-netlogon.patch diff --git a/SPECS-EXTENDED/samba/0002-CVE-2025-49716-netlogon.patch b/SPECS-EXTENDED/samba/0002-CVE-2025-49716-netlogon.patch new file mode 100644 index 00000000000..e69de29bb2d diff --git a/SPECS-EXTENDED/samba/samba.spec b/SPECS-EXTENDED/samba/samba.spec index 6fadefe39d4..2d1c496bcbb 100644 --- a/SPECS-EXTENDED/samba/samba.spec +++ b/SPECS-EXTENDED/samba/samba.spec @@ -87,7 +87,7 @@ Name: samba Version: 4.18.3 -Release: 1%{?dist} +Release: 2%{?dist} %define samba_depver %{version}-%{release} @@ -113,6 +113,7 @@ Source14: samba.pamd Source201: README.downgrade Patch0: 0001-Disable-building-smb.conf.5-in-docs-xml-wscript.patch +Patch1: 0002-CVE-2025-49716-netlogon.patch Requires(pre): /usr/sbin/groupadd Requires(post): systemd @@ -3872,6 +3873,9 @@ fi %endif %changelog +* Tue Oct 14 2025 Andy Zaugg - 4.18.3-2 +- Fix winbind netlogon issue with Windows security update 2025 CVE-2025-49716 + * Thu Aug 08 2024 Sindhu Karri - 4.18.3-1 - Upgrade samba to build with Python 3.12 - Add patch 0001-Disable-building-smb.conf.5-in-docs-xml-wscript.patch to fix build From e1c60a2674746725008d28997d74d9499182f8ab Mon Sep 17 00:00:00 2001 From: Andy Zaugg Date: Tue, 14 Oct 2025 19:34:58 +0000 Subject: [PATCH 2/2] Add contents to patch --- .../samba/0002-CVE-2025-49716-netlogon.patch | 462 ++++++++++++++++++ 1 file changed, 462 insertions(+) diff --git a/SPECS-EXTENDED/samba/0002-CVE-2025-49716-netlogon.patch b/SPECS-EXTENDED/samba/0002-CVE-2025-49716-netlogon.patch index e69de29bb2d..0de35d6b0a7 100644 --- a/SPECS-EXTENDED/samba/0002-CVE-2025-49716-netlogon.patch +++ b/SPECS-EXTENDED/samba/0002-CVE-2025-49716-netlogon.patch @@ -0,0 +1,462 @@ +commit 3bf8a6cea23bfef3801366d0c5682abe78463121 +Author: Günther Deschner +Date: Wed Jul 2 21:59:48 2025 +0200 + + s3-winbindd: Fix internal winbind dsgetdcname calls w.r.t. domain name + + when winbind calls to dsgetdcname internally, make sure to + prefer the DNS domain name if we have it. Makes DNS lookups much more + likely to succeed. + + BUG: https://bugzilla.samba.org/show_bug.cgi?id=15876 + + Guenther + + Signed-off-by: Guenther Deschner + Reviewed-by: Andreas Schneider + Reviewed-by: Ralph Boehme + + Autobuild-User(master): Ralph Böhme + Autobuild-Date(master): Mon Jul 7 10:44:37 UTC 2025 on atb-devel-224 + +diff --git a/source3/winbindd/wb_queryuser.c b/source3/winbindd/wb_queryuser.c +index c079cbcfd90..69b8107f095 100644 +--- a/source3/winbindd/wb_queryuser.c ++++ b/source3/winbindd/wb_queryuser.c +@@ -282,10 +282,19 @@ static void wb_queryuser_done(struct tevent_req *subreq) + + if (NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) && + !state->tried_dclookup) { +- D_DEBUG("GetNssInfo got DOMAIN_CONTROLLER_NOT_FOUND, calling wb_dsgetdcname_send()\n"); +- subreq = wb_dsgetdcname_send( +- state, state->ev, state->info->domain_name, NULL, NULL, +- DS_RETURN_DNS_NAME); ++ const char *domain_name = find_dns_domain_name( ++ state->info->domain_name); ++ ++ D_DEBUG("GetNssInfo got DOMAIN_CONTROLLER_NOT_FOUND, calling " ++ "wb_dsgetdcname_send(%s)\n", ++ domain_name); ++ ++ subreq = wb_dsgetdcname_send(state, ++ state->ev, ++ domain_name, ++ NULL, ++ NULL, ++ DS_RETURN_DNS_NAME); + if (tevent_req_nomem(subreq, req)) { + return; + } +diff --git a/source3/winbindd/wb_sids2xids.c b/source3/winbindd/wb_sids2xids.c +index 9a3507ba702..7c91383ebab 100644 +--- a/source3/winbindd/wb_sids2xids.c ++++ b/source3/winbindd/wb_sids2xids.c +@@ -612,13 +612,22 @@ static void wb_sids2xids_done(struct tevent_req *subreq) + !state->tried_dclookup) { + + struct lsa_DomainInfo *d; ++ const char *domain_name = NULL; + +- D_DEBUG("Domain controller not found. Calling wb_dsgetdcname_send() to get it.\n"); + d = &state->idmap_doms.domains[state->dom_index]; + +- subreq = wb_dsgetdcname_send( +- state, state->ev, d->name.string, NULL, NULL, +- DS_RETURN_DNS_NAME); ++ domain_name = find_dns_domain_name(d->name.string); ++ ++ D_DEBUG("Domain controller not found. Calling " ++ "wb_dsgetdcname_send(%s) to get it.\n", ++ domain_name); ++ ++ subreq = wb_dsgetdcname_send(state, ++ state->ev, ++ domain_name, ++ NULL, ++ NULL, ++ DS_RETURN_DNS_NAME); + if (tevent_req_nomem(subreq, req)) { + return; + } +diff --git a/source3/winbindd/wb_xids2sids.c b/source3/winbindd/wb_xids2sids.c +index 86bd7f9deab..6fcf524d94f 100644 +--- a/source3/winbindd/wb_xids2sids.c ++++ b/source3/winbindd/wb_xids2sids.c +@@ -143,9 +143,15 @@ static void wb_xids2sids_dom_done(struct tevent_req *subreq) + if (NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) && + !state->tried_dclookup) { + +- subreq = wb_dsgetdcname_send( +- state, state->ev, state->dom_map->name, NULL, NULL, +- DS_RETURN_DNS_NAME); ++ const char *domain_name = find_dns_domain_name( ++ state->dom_map->name); ++ ++ subreq = wb_dsgetdcname_send(state, ++ state->ev, ++ domain_name, ++ NULL, ++ NULL, ++ DS_RETURN_DNS_NAME); + if (tevent_req_nomem(subreq, req)) { + return; + } +diff --git a/source3/winbindd/winbindd_dual.c b/source3/winbindd/winbindd_dual.c +index d053977033f..d55ef948391 100644 +--- a/source3/winbindd/winbindd_dual.c ++++ b/source3/winbindd/winbindd_dual.c +@@ -532,6 +532,7 @@ static void wb_domain_request_trigger(struct tevent_req *req, + struct wb_domain_request_state *state = tevent_req_data( + req, struct wb_domain_request_state); + struct winbindd_domain *domain = state->domain; ++ const char *domain_name = NULL; + struct tevent_req *subreq = NULL; + size_t shortest_queue_length; + +@@ -604,8 +605,11 @@ static void wb_domain_request_trigger(struct tevent_req *req, + * which is indicated by DS_RETURN_DNS_NAME. + * For NT4 domains we still get the netbios name. + */ ++ ++ domain_name = find_dns_domain_name(state->domain->name); ++ + subreq = wb_dsgetdcname_send(state, state->ev, +- state->domain->name, ++ domain_name, + NULL, /* domain_guid */ + NULL, /* site_name */ + DS_RETURN_DNS_NAME); /* flags */ +diff --git a/source3/winbindd/winbindd_proto.h b/source3/winbindd/winbindd_proto.h +index bfa114c3291..47c271a5ad2 100644 +--- a/source3/winbindd/winbindd_proto.h ++++ b/source3/winbindd/winbindd_proto.h +@@ -552,6 +552,7 @@ bool parse_sidlist(TALLOC_CTX *mem_ctx, const char *sidstr, + struct dom_sid **sids, uint32_t *num_sids); + bool parse_xidlist(TALLOC_CTX *mem_ctx, const char *xidstr, + struct unixid **pxids, uint32_t *pnum_xids); ++const char *find_dns_domain_name(const char *domain_name); + + /* The following definitions come from winbindd/winbindd_wins.c */ + +diff --git a/source3/winbindd/winbindd_util.c b/source3/winbindd/winbindd_util.c +index b4c53ba971c..df2a8e2cca6 100644 +--- a/source3/winbindd/winbindd_util.c ++++ b/source3/winbindd/winbindd_util.c +@@ -2181,3 +2181,22 @@ fail: + TALLOC_FREE(xids); + return false; + } ++ ++/** ++ * Helper to extract the DNS Domain Name from a struct winbindd_domain ++ */ ++const char *find_dns_domain_name(const char *domain_name) ++{ ++ struct winbindd_domain *wbdom = NULL; ++ ++ wbdom = find_domain_from_name(domain_name); ++ if (wbdom == NULL) { ++ return domain_name; ++ } ++ ++ if (wbdom->active_directory && wbdom->alt_name != NULL) { ++ return wbdom->alt_name; ++ } ++ ++ return wbdom->name; ++} + +commit 5f85ca84229180f50980bf194eda952a2b6e923e +Author: Stefan Metzmacher +Date: Fri May 9 09:38:41 2025 +0200 + + s3:winbindd: avoid using any netlogon call to get a dc name + + BUG: https://bugzilla.samba.org/show_bug.cgi?id=15876 + + Signed-off-by: Stefan Metzmacher + Reviewed-by: Guenther Deschner + Reviewed-by: Andreas Schneider + Reviewed-by: Ralph Boehme + +diff --git a/source3/winbindd/winbindd_cm.c b/source3/winbindd/winbindd_cm.c +index 264fc1368d6..a0cd0b3bdc8 100644 +--- a/source3/winbindd/winbindd_cm.c ++++ b/source3/winbindd/winbindd_cm.c +@@ -475,135 +475,6 @@ static bool cm_is_ipc_credentials(struct cli_credentials *creds) + return ret; + } + +-static bool get_dc_name_via_netlogon(struct winbindd_domain *domain, +- fstring dcname, +- struct sockaddr_storage *dc_ss, +- uint32_t request_flags) +-{ +- struct winbindd_domain *our_domain = NULL; +- struct rpc_pipe_client *netlogon_pipe = NULL; +- NTSTATUS result; +- WERROR werr; +- TALLOC_CTX *mem_ctx; +- unsigned int orig_timeout; +- const char *tmp = NULL; +- const char *p; +- struct dcerpc_binding_handle *b; +- +- /* Hmmmm. We can only open one connection to the NETLOGON pipe at the +- * moment.... */ +- +- if (IS_DC) { +- return False; +- } +- +- if (domain->primary) { +- return False; +- } +- +- our_domain = find_our_domain(); +- +- if ((mem_ctx = talloc_init("get_dc_name_via_netlogon")) == NULL) { +- return False; +- } +- +- result = cm_connect_netlogon(our_domain, &netlogon_pipe); +- if (!NT_STATUS_IS_OK(result)) { +- talloc_destroy(mem_ctx); +- return False; +- } +- +- b = netlogon_pipe->binding_handle; +- +- /* This call can take a long time - allow the server to time out. +- 35 seconds should do it. */ +- +- orig_timeout = rpccli_set_timeout(netlogon_pipe, 35000); +- +- if (our_domain->active_directory) { +- struct netr_DsRGetDCNameInfo *domain_info = NULL; +- +- /* +- * TODO request flags are not respected in the server +- * (and in some cases, like REQUIRE_PDC, causes an error) +- */ +- result = dcerpc_netr_DsRGetDCName(b, +- mem_ctx, +- our_domain->dcname, +- domain->name, +- NULL, +- NULL, +- request_flags|DS_RETURN_DNS_NAME, +- &domain_info, +- &werr); +- if (NT_STATUS_IS_OK(result) && W_ERROR_IS_OK(werr)) { +- tmp = talloc_strdup( +- mem_ctx, domain_info->dc_unc); +- if (tmp == NULL) { +- DEBUG(0, ("talloc_strdup failed\n")); +- talloc_destroy(mem_ctx); +- return false; +- } +- if (domain->alt_name == NULL) { +- domain->alt_name = talloc_strdup(domain, +- domain_info->domain_name); +- if (domain->alt_name == NULL) { +- DEBUG(0, ("talloc_strdup failed\n")); +- talloc_destroy(mem_ctx); +- return false; +- } +- } +- if (domain->forest_name == NULL) { +- domain->forest_name = talloc_strdup(domain, +- domain_info->forest_name); +- if (domain->forest_name == NULL) { +- DEBUG(0, ("talloc_strdup failed\n")); +- talloc_destroy(mem_ctx); +- return false; +- } +- } +- } +- } else { +- result = dcerpc_netr_GetAnyDCName(b, mem_ctx, +- our_domain->dcname, +- domain->name, +- &tmp, +- &werr); +- } +- +- /* And restore our original timeout. */ +- rpccli_set_timeout(netlogon_pipe, orig_timeout); +- +- if (!NT_STATUS_IS_OK(result)) { +- DEBUG(10,("dcerpc_netr_GetAnyDCName failed: %s\n", +- nt_errstr(result))); +- talloc_destroy(mem_ctx); +- return false; +- } +- +- if (!W_ERROR_IS_OK(werr)) { +- DEBUG(10,("dcerpc_netr_GetAnyDCName failed: %s\n", +- win_errstr(werr))); +- talloc_destroy(mem_ctx); +- return false; +- } +- +- /* dcerpc_netr_GetAnyDCName gives us a name with \\ */ +- p = strip_hostname(tmp); +- +- fstrcpy(dcname, p); +- +- talloc_destroy(mem_ctx); +- +- DEBUG(10,("dcerpc_netr_GetAnyDCName returned %s\n", dcname)); +- +- if (!resolve_name(dcname, dc_ss, 0x20, true)) { +- return False; +- } +- +- return True; +-} +- + /** + * Helper function to assemble trust password and account name + */ +@@ -1264,24 +1135,8 @@ static bool get_dcs(TALLOC_CTX *mem_ctx, struct winbindd_domain *domain, + struct samba_sockaddr *sa_list = NULL; + size_t salist_size = 0; + size_t i; +- bool is_our_domain; + enum security_types sec = (enum security_types)lp_security(); + +- is_our_domain = strequal(domain->name, lp_workgroup()); +- +- /* If not our domain, get the preferred DC, by asking our primary DC */ +- if ( !is_our_domain +- && get_dc_name_via_netlogon(domain, dcname, &ss, request_flags) +- && add_one_dc_unique(mem_ctx, domain->name, dcname, &ss, dcs, +- num_dcs) ) +- { +- char addr[INET6_ADDRSTRLEN]; +- print_sockaddr(addr, sizeof(addr), &ss); +- DEBUG(10, ("Retrieved DC %s at %s via netlogon\n", +- dcname, addr)); +- return True; +- } +- + if ((sec == SEC_ADS) && (domain->alt_name != NULL)) { + char *sitename = NULL; + +diff --git a/source3/winbindd/winbindd_dual_srv.c b/source3/winbindd/winbindd_dual_srv.c +index aaa78a9cb6e..eeaa53b0c79 100644 +--- a/source3/winbindd/winbindd_dual_srv.c ++++ b/source3/winbindd/winbindd_dual_srv.c +@@ -624,106 +624,11 @@ NTSTATUS _wbint_QueryUserRidList(struct pipes_struct *p, + + NTSTATUS _wbint_DsGetDcName(struct pipes_struct *p, struct wbint_DsGetDcName *r) + { +- struct winbindd_domain *domain = wb_child_domain(); +- struct rpc_pipe_client *netlogon_pipe; +- struct netr_DsRGetDCNameInfo *dc_info; +- NTSTATUS status; +- WERROR werr; +- unsigned int orig_timeout; +- struct dcerpc_binding_handle *b; +- bool retry = false; +- bool try_dsrgetdcname = false; +- +- if (domain == NULL) { +- return dsgetdcname(p->mem_ctx, global_messaging_context(), +- r->in.domain_name, r->in.domain_guid, +- r->in.site_name ? r->in.site_name : "", +- r->in.flags, +- r->out.dc_info); +- } +- +- if (domain->active_directory) { +- try_dsrgetdcname = true; +- } +- +-reconnect: +- status = cm_connect_netlogon(domain, &netlogon_pipe); +- +- reset_cm_connection_on_error(domain, NULL, status); +- if (!NT_STATUS_IS_OK(status)) { +- DEBUG(10, ("Can't contact the NETLOGON pipe\n")); +- return status; +- } +- +- b = netlogon_pipe->binding_handle; +- +- /* This call can take a long time - allow the server to time out. +- 35 seconds should do it. */ +- +- orig_timeout = rpccli_set_timeout(netlogon_pipe, 35000); +- +- if (try_dsrgetdcname) { +- status = dcerpc_netr_DsRGetDCName(b, +- p->mem_ctx, domain->dcname, +- r->in.domain_name, NULL, r->in.domain_guid, +- r->in.flags, r->out.dc_info, &werr); +- if (NT_STATUS_IS_OK(status) && W_ERROR_IS_OK(werr)) { +- goto done; +- } +- if (!retry && +- reset_cm_connection_on_error(domain, NULL, status)) +- { +- retry = true; +- goto reconnect; +- } +- try_dsrgetdcname = false; +- retry = false; +- } +- +- /* +- * Fallback to less capable methods +- */ +- +- dc_info = talloc_zero(r->out.dc_info, struct netr_DsRGetDCNameInfo); +- if (dc_info == NULL) { +- status = NT_STATUS_NO_MEMORY; +- goto done; +- } +- +- if (r->in.flags & DS_PDC_REQUIRED) { +- status = dcerpc_netr_GetDcName(b, +- p->mem_ctx, domain->dcname, +- r->in.domain_name, &dc_info->dc_unc, &werr); +- } else { +- status = dcerpc_netr_GetAnyDCName(b, +- p->mem_ctx, domain->dcname, +- r->in.domain_name, &dc_info->dc_unc, &werr); +- } +- +- if (!retry && reset_cm_connection_on_error(domain, b, status)) { +- retry = true; +- goto reconnect; +- } +- if (!NT_STATUS_IS_OK(status)) { +- DEBUG(10, ("dcerpc_netr_Get[Any]DCName failed: %s\n", +- nt_errstr(status))); +- goto done; +- } +- if (!W_ERROR_IS_OK(werr)) { +- DEBUG(10, ("dcerpc_netr_Get[Any]DCName failed: %s\n", +- win_errstr(werr))); +- status = werror_to_ntstatus(werr); +- goto done; +- } +- +- *r->out.dc_info = dc_info; +- status = NT_STATUS_OK; +- +-done: +- /* And restore our original timeout. */ +- rpccli_set_timeout(netlogon_pipe, orig_timeout); +- +- return status; ++ return dsgetdcname(p->mem_ctx, global_messaging_context(), ++ r->in.domain_name, r->in.domain_guid, ++ r->in.site_name ? r->in.site_name : "", ++ r->in.flags, ++ r->out.dc_info); + } + + NTSTATUS _wbint_LookupRids(struct pipes_struct *p, struct wbint_LookupRids *r)