From f60398d7b20869d7b09d81854f3727fdcd897430 Mon Sep 17 00:00:00 2001 From: Günther Deschner Date: Fri, 7 Jan 2011 17:28:29 +0100 Subject: s3-winbindd: let winbind try to use samlogon validation level 6. (bug #7945) The benefit of this that it makes us more robust to secure channel resets triggered from tools outside the winbind process. Long term we need to have a shared tdb secure channel store though as well. Guenther Signed-off-by: Stefan Metzmacher Autobuild-User: Stefan Metzmacher Autobuild-Date: Fri Feb 4 18:11:04 CET 2011 on sn-devel-104 --- source3/auth/auth_domain.c | 1 + source3/auth/auth_netlogond.c | 1 + source3/rpc_client/cli_netlogon.c | 62 ++++++++++++++++++++++++++++++++++++--- source3/rpc_client/cli_netlogon.h | 2 ++ source3/winbindd/winbindd.h | 1 + source3/winbindd/winbindd_cm.c | 1 + source3/winbindd/winbindd_pam.c | 59 +++++++++++++++++++++++++++++++++++-- 7 files changed, 121 insertions(+), 6 deletions(-) (limited to 'source3') diff --git a/source3/auth/auth_domain.c b/source3/auth/auth_domain.c index 0f541cd1e7..05421debbb 100644 --- a/source3/auth/auth_domain.c +++ b/source3/auth/auth_domain.c @@ -309,6 +309,7 @@ static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx, user_info->client.domain_name, /* domain name */ user_info->workstation_name, /* workstation name */ chal, /* 8 byte challenge. */ + 3, /* validation level */ user_info->password.response.lanman, /* lanman 24 byte response */ user_info->password.response.nt, /* nt 24 byte response */ &info3); /* info3 out */ diff --git a/source3/auth/auth_netlogond.c b/source3/auth/auth_netlogond.c index 889371c722..1e3ccb1189 100644 --- a/source3/auth/auth_netlogond.c +++ b/source3/auth/auth_netlogond.c @@ -88,6 +88,7 @@ static NTSTATUS netlogond_validate(TALLOC_CTX *mem_ctx, user_info->client.domain_name, /* domain name */ user_info->workstation_name, /* workstation name */ (uchar *)auth_context->challenge.data, /* 8 byte challenge. */ + 3, /* validation level */ user_info->password.response.lanman, /* lanman 24 byte response */ user_info->password.response.nt, /* nt 24 byte response */ &info3); /* info3 out */ diff --git a/source3/rpc_client/cli_netlogon.c b/source3/rpc_client/cli_netlogon.c index 914bfd3df6..f34d794ea4 100644 --- a/source3/rpc_client/cli_netlogon.c +++ b/source3/rpc_client/cli_netlogon.c @@ -25,6 +25,8 @@ #include "../librpc/gen_ndr/ndr_netlogon_c.h" #include "rpc_client/cli_netlogon.h" #include "rpc_client/init_netlogon.h" +#include "rpc_client/util_netlogon.h" +#include "../libcli/security/security.h" /**************************************************************************** Wrapper function that uses the auth and auth2 calls to set up a NETLOGON @@ -298,6 +300,52 @@ NTSTATUS rpccli_netlogon_sam_logon(struct rpc_pipe_client *cli, return result; } +static NTSTATUS map_validation_to_info3(TALLOC_CTX *mem_ctx, + uint16_t validation_level, + union netr_Validation *validation, + struct netr_SamInfo3 **info3_p) +{ + struct netr_SamInfo3 *info3; + NTSTATUS status; + + if (validation == NULL) { + return NT_STATUS_INVALID_PARAMETER; + } + + switch (validation_level) { + case 3: + if (validation->sam3 == NULL) { + return NT_STATUS_INVALID_PARAMETER; + } + + info3 = talloc_move(mem_ctx, &validation->sam3); + break; + case 6: + if (validation->sam6 == NULL) { + return NT_STATUS_INVALID_PARAMETER; + } + + info3 = talloc_zero(mem_ctx, struct netr_SamInfo3); + if (info3 == NULL) { + return NT_STATUS_NO_MEMORY; + } + status = copy_netr_SamBaseInfo(info3, &validation->sam6->base, &info3->base); + if (!NT_STATUS_IS_OK(status)) { + TALLOC_FREE(info3); + return status; + } + + info3->sidcount = validation->sam6->sidcount; + info3->sids = talloc_move(info3, &validation->sam6->sids); + break; + default: + return NT_STATUS_BAD_VALIDATION_CLASS; + } + + *info3_p = info3; + + return NT_STATUS_OK; +} /** * Logon domain user with an 'network' SAM logon @@ -313,13 +361,13 @@ NTSTATUS rpccli_netlogon_sam_network_logon(struct rpc_pipe_client *cli, const char *domain, const char *workstation, const uint8 chal[8], + uint16_t validation_level, DATA_BLOB lm_response, DATA_BLOB nt_response, struct netr_SamInfo3 **info3) { NTSTATUS result = NT_STATUS_UNSUCCESSFUL; NTSTATUS status; - int validation_level = 3; const char *workstation_name_slash; const char *server_name_slash; struct netr_Authenticator clnt_creds; @@ -417,7 +465,10 @@ NTSTATUS rpccli_netlogon_sam_network_logon(struct rpc_pipe_client *cli, netlogon_creds_decrypt_samlogon(cli->dc, validation_level, &validation); - *info3 = validation.sam3; + result = map_validation_to_info3(mem_ctx, validation_level, &validation, info3); + if (!NT_STATUS_IS_OK(result)) { + return result; + } return result; } @@ -430,13 +481,13 @@ NTSTATUS rpccli_netlogon_sam_network_logon_ex(struct rpc_pipe_client *cli, const char *domain, const char *workstation, const uint8 chal[8], + uint16_t validation_level, DATA_BLOB lm_response, DATA_BLOB nt_response, struct netr_SamInfo3 **info3) { NTSTATUS result = NT_STATUS_UNSUCCESSFUL; NTSTATUS status; - int validation_level = 3; const char *workstation_name_slash; const char *server_name_slash; union netr_LogonLevel *logon = NULL; @@ -522,7 +573,10 @@ NTSTATUS rpccli_netlogon_sam_network_logon_ex(struct rpc_pipe_client *cli, netlogon_creds_decrypt_samlogon(cli->dc, validation_level, &validation); - *info3 = validation.sam3; + result = map_validation_to_info3(mem_ctx, validation_level, &validation, info3); + if (!NT_STATUS_IS_OK(result)) { + return result; + } return result; } diff --git a/source3/rpc_client/cli_netlogon.h b/source3/rpc_client/cli_netlogon.h index bb38b75b95..808a4283ce 100644 --- a/source3/rpc_client/cli_netlogon.h +++ b/source3/rpc_client/cli_netlogon.h @@ -25,6 +25,7 @@ NTSTATUS rpccli_netlogon_sam_network_logon(struct rpc_pipe_client *cli, const char *domain, const char *workstation, const uint8 chal[8], + uint16_t validation_level, DATA_BLOB lm_response, DATA_BLOB nt_response, struct netr_SamInfo3 **info3); @@ -36,6 +37,7 @@ NTSTATUS rpccli_netlogon_sam_network_logon_ex(struct rpc_pipe_client *cli, const char *domain, const char *workstation, const uint8 chal[8], + uint16_t validation_level, DATA_BLOB lm_response, DATA_BLOB nt_response, struct netr_SamInfo3 **info3); diff --git a/source3/winbindd/winbindd.h b/source3/winbindd/winbindd.h index 3217acc8ea..a32c78f4e4 100644 --- a/source3/winbindd/winbindd.h +++ b/source3/winbindd/winbindd.h @@ -169,6 +169,7 @@ struct winbindd_domain { * we don't have to try _ex every time. */ bool can_do_ncacn_ip_tcp; + bool can_do_validation6; /* Lookup methods for this domain (LDAP or RPC) */ struct winbindd_methods *methods; diff --git a/source3/winbindd/winbindd_cm.c b/source3/winbindd/winbindd_cm.c index c692ffe75c..c53a553af8 100644 --- a/source3/winbindd/winbindd_cm.c +++ b/source3/winbindd/winbindd_cm.c @@ -2086,6 +2086,7 @@ done: domain->name, domain->active_directory ? "" : "NOT ")); domain->can_do_ncacn_ip_tcp = domain->active_directory; + domain->can_do_validation6 = domain->active_directory; TALLOC_FREE(cli); diff --git a/source3/winbindd/winbindd_pam.c b/source3/winbindd/winbindd_pam.c index 760fa3bc60..68fa01f6d7 100644 --- a/source3/winbindd/winbindd_pam.c +++ b/source3/winbindd/winbindd_pam.c @@ -1148,6 +1148,8 @@ static NTSTATUS winbind_samlogon_retry_loop(struct winbindd_domain *domain, do { struct rpc_pipe_client *netlogon_pipe; + const struct pipe_auth_data *auth; + uint32_t neg_flags = 0; ZERO_STRUCTP(info3); retry = false; @@ -1159,6 +1161,10 @@ static NTSTATUS winbind_samlogon_retry_loop(struct winbindd_domain *domain, nt_errstr(result))); return result; } + auth = netlogon_pipe->auth; + if (netlogon_pipe->dc) { + neg_flags = netlogon_pipe->dc->negotiate_flags; + } /* It is really important to try SamLogonEx here, * because in a clustered environment, we want to use @@ -1179,8 +1185,35 @@ static NTSTATUS winbind_samlogon_retry_loop(struct winbindd_domain *domain, * wrapping SamLogon context. * * -- abartlet 21 April 2008 + * + * It's also important to use NetlogonValidationSamInfo4 (6), + * because it relies on the rpc transport encryption + * and avoids using the global netlogon schannel + * session key to en/decrypt secret information + * like the user_session_key for network logons. + * + * [MS-APDS] 3.1.5.2 NTLM Network Logon + * says NETLOGON_NEG_CROSS_FOREST_TRUSTS and + * NETLOGON_NEG_AUTHENTICATED_RPC set together + * are the indication that the server supports + * NetlogonValidationSamInfo4 (6). And it must only + * be used if "SealSecureChannel" is used. + * + * -- metze 4 February 2011 */ + if (auth == NULL) { + domain->can_do_validation6 = false; + } else if (auth->auth_type != DCERPC_AUTH_TYPE_SCHANNEL) { + domain->can_do_validation6 = false; + } else if (auth->auth_level != DCERPC_AUTH_LEVEL_PRIVACY) { + domain->can_do_validation6 = false; + } else if (!(neg_flags & NETLOGON_NEG_CROSS_FOREST_TRUSTS)) { + domain->can_do_validation6 = false; + } else if (!(neg_flags & NETLOGON_NEG_AUTHENTICATED_RPC)) { + domain->can_do_validation6 = false; + } + if (domain->can_do_samlogon_ex) { result = rpccli_netlogon_sam_network_logon_ex( netlogon_pipe, @@ -1191,6 +1224,7 @@ static NTSTATUS winbind_samlogon_retry_loop(struct winbindd_domain *domain, domainname, /* target domain */ workstation, /* workstation */ chal, + domain->can_do_validation6 ? 6 : 3, lm_response, nt_response, info3); @@ -1204,22 +1238,43 @@ static NTSTATUS winbind_samlogon_retry_loop(struct winbindd_domain *domain, domainname, /* target domain */ workstation, /* workstation */ chal, + domain->can_do_validation6 ? 6 : 3, lm_response, nt_response, info3); } - attempts += 1; - if ((NT_STATUS_V(result) == DCERPC_FAULT_OP_RNG_ERROR) && domain->can_do_samlogon_ex) { DEBUG(3, ("Got a DC that can not do NetSamLogonEx, " "retrying with NetSamLogon\n")); domain->can_do_samlogon_ex = false; + /* + * It's likely that the server also does not support + * validation level 6 + */ + domain->can_do_validation6 = false; retry = true; continue; } + if (domain->can_do_validation6 && + (NT_STATUS_EQUAL(result, NT_STATUS_INVALID_INFO_CLASS) || + NT_STATUS_EQUAL(result, NT_STATUS_INVALID_PARAMETER) || + NT_STATUS_EQUAL(result, NT_STATUS_BUFFER_TOO_SMALL))) { + DEBUG(3,("Got a DC that can not do validation level 6, " + "retrying with level 3\n")); + domain->can_do_validation6 = false; + retry = true; + continue; + } + + /* + * we increment this after the "feature negotiation" + * for can_do_samlogon_ex and can_do_validation6 + */ + attempts += 1; + /* We have to try a second time as cm_connect_netlogon might not yet have noticed that the DC has killed our connection. */ -- cgit