diff options
Diffstat (limited to 'source3')
| -rw-r--r-- | source3/libsmb/clifsinfo.c | 146 | ||||
| -rw-r--r-- | source3/smbd/seal.c | 221 |
2 files changed, 82 insertions, 285 deletions
diff --git a/source3/libsmb/clifsinfo.c b/source3/libsmb/clifsinfo.c index dd9da54d33..26f98311cb 100644 --- a/source3/libsmb/clifsinfo.c +++ b/source3/libsmb/clifsinfo.c @@ -30,6 +30,7 @@ #include "auth_generic.h" #include "auth/gensec/gensec.h" #include "../libcli/smb/smbXcli_base.h" +#include "auth/credentials/credentials.h" /**************************************************************************** Get UNIX extensions version info. @@ -585,16 +586,6 @@ static struct smb_trans_enc_state *make_cli_enc_state(enum smb_trans_enc_type sm ZERO_STRUCTP(es); es->smb_enc_type = smb_enc_type; -#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5) - if (smb_enc_type == SMB_TRANS_ENC_GSS) { - es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss); - if (!es->s.gss_state) { - SAFE_FREE(es); - return NULL; - } - ZERO_STRUCTP(es->s.gss_state); - } -#endif return es; } @@ -683,99 +674,33 @@ NTSTATUS cli_raw_ntlm_smb_encryption_start(struct cli_state *cli, return status; } -#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5) - -#ifndef SMB_GSS_REQUIRED_FLAGS -#define SMB_GSS_REQUIRED_FLAGS (GSS_C_CONF_FLAG|GSS_C_INTEG_FLAG|GSS_C_MUTUAL_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG) -#endif - /****************************************************************************** Get client gss blob to send to a server. ******************************************************************************/ static NTSTATUS make_cli_gss_blob(TALLOC_CTX *ctx, - struct smb_trans_enc_state *es, - const char *service, - const char *host, + struct gensec_security *gensec_security, NTSTATUS status_in, DATA_BLOB spnego_blob_in, DATA_BLOB *p_blob_out) { const char *krb_mechs[] = {OID_KERBEROS5, NULL}; - OM_uint32 ret; - OM_uint32 min; - gss_name_t srv_name; - gss_buffer_desc input_name; - gss_buffer_desc *p_tok_in; - gss_buffer_desc tok_out, tok_in; DATA_BLOB blob_out = data_blob_null; DATA_BLOB blob_in = data_blob_null; - OM_uint32 ret_flags = 0; NTSTATUS status = NT_STATUS_OK; - memset(&tok_out, '\0', sizeof(tok_out)); - - /* Guess the realm based on the supplied service, and avoid the GSS libs - doing DNS lookups which may fail. - - TODO: Loop with the KDC on some more combinations (local - realm in particular), possibly falling back to - GSS_C_NT_HOSTBASED_SERVICE - */ - input_name.value = kerberos_get_principal_from_service_hostname(talloc_tos(), - service, host); - if (!input_name.value) { - return NT_STATUS_NO_MEMORY; - } - input_name.length = strlen((char *)input_name.value); - ret = gss_import_name(&min, &input_name, - GSS_C_NT_USER_NAME, - &srv_name); - if (ret != GSS_S_COMPLETE) { - TALLOC_FREE(input_name.value); - return map_nt_error_from_gss(ret, min); - } - if (spnego_blob_in.length == 0) { - p_tok_in = GSS_C_NO_BUFFER; + blob_in = spnego_blob_in; } else { /* Remove the SPNEGO wrapper */ if (!spnego_parse_auth_response(ctx, spnego_blob_in, status_in, OID_KERBEROS5, &blob_in)) { status = NT_STATUS_UNSUCCESSFUL; goto fail; } - tok_in.value = blob_in.data; - tok_in.length = blob_in.length; - p_tok_in = &tok_in; - } - - ret = gss_init_sec_context(&min, - GSS_C_NO_CREDENTIAL, /* Use our default cred. */ - &es->s.gss_state->gss_ctx, - srv_name, - GSS_C_NO_OID, /* default OID. */ - GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG | GSS_C_SEQUENCE_FLAG | GSS_C_DELEG_FLAG, - GSS_C_INDEFINITE, /* requested ticket lifetime. */ - NULL, /* no channel bindings */ - p_tok_in, - NULL, /* ignore mech type */ - &tok_out, - &ret_flags, - NULL); /* ignore time_rec */ - - status = map_nt_error_from_gss(ret, min); - if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED)) { - ADS_STATUS adss = ADS_ERROR_GSS(ret, min); - DEBUG(10,("make_cli_gss_blob: gss_init_sec_context failed with %s\n", - ads_errstr(adss))); - goto fail; - } - - if ((ret_flags & SMB_GSS_REQUIRED_FLAGS) != SMB_GSS_REQUIRED_FLAGS) { - status = NT_STATUS_ACCESS_DENIED; } - blob_out = data_blob_talloc(ctx, tok_out.value, tok_out.length); + status = gensec_update(gensec_security, ctx, + NULL, blob_in, &blob_out); /* Wrap in an SPNEGO wrapper */ *p_blob_out = spnego_gen_negTokenInit(ctx, krb_mechs, &blob_out, NULL); @@ -784,11 +709,6 @@ static NTSTATUS make_cli_gss_blob(TALLOC_CTX *ctx, data_blob_free(&blob_out); data_blob_free(&blob_in); - TALLOC_FREE(input_name.value); - gss_release_name(&min, &srv_name); - if (tok_out.value) { - gss_release_buffer(&min, &tok_out); - } return status; } @@ -802,16 +722,41 @@ NTSTATUS cli_gss_smb_encryption_start(struct cli_state *cli) DATA_BLOB blob_send = data_blob_null; DATA_BLOB param_out = data_blob_null; NTSTATUS status = NT_STATUS_UNSUCCESSFUL; - fstring fqdn; - const char *servicename; + struct auth_generic_state *auth_generic_state; struct smb_trans_enc_state *es = make_cli_enc_state(SMB_TRANS_ENC_GSS); if (!es) { return NT_STATUS_NO_MEMORY; } - servicename = "cifs"; - status = make_cli_gss_blob(talloc_tos(), es, servicename, cli_state_remote_name(cli), NT_STATUS_OK, blob_recv, &blob_send); + status = auth_generic_client_prepare(NULL, + &auth_generic_state); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } + + gensec_want_feature(auth_generic_state->gensec_security, GENSEC_FEATURE_SESSION_KEY); + gensec_want_feature(auth_generic_state->gensec_security, GENSEC_FEATURE_SEAL); + + cli_credentials_set_kerberos_state(auth_generic_state->credentials, + CRED_MUST_USE_KERBEROS); + + status = gensec_set_target_service(auth_generic_state->gensec_security, "cifs"); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } + + status = gensec_set_target_hostname(auth_generic_state->gensec_security, + cli_state_remote_name(cli)); + if (!NT_STATUS_IS_OK(status)) { + goto fail; + } + + if (!NT_STATUS_IS_OK(status = auth_generic_client_start(auth_generic_state, GENSEC_OID_KERBEROS5))) { + goto fail; + } + + status = make_cli_gss_blob(talloc_tos(), auth_generic_state->gensec_security, NT_STATUS_OK, blob_recv, &blob_send); do { data_blob_free(&blob_recv); status = enc_blob_send_receive(cli, &blob_send, &blob_recv, ¶m_out); @@ -819,25 +764,34 @@ NTSTATUS cli_gss_smb_encryption_start(struct cli_state *cli) es->enc_ctx_num = SVAL(param_out.data, 0); } data_blob_free(&blob_send); - status = make_cli_gss_blob(talloc_tos(), es, servicename, fqdn, status, blob_recv, &blob_send); + status = make_cli_gss_blob(talloc_tos(), auth_generic_state->gensec_security, status, blob_recv, &blob_send); } while (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)); data_blob_free(&blob_recv); if (NT_STATUS_IS_OK(status)) { + if (!gensec_have_feature(auth_generic_state->gensec_security, + GENSEC_FEATURE_SIGN) || + !gensec_have_feature(auth_generic_state->gensec_security, + GENSEC_FEATURE_SEAL)) { + status = NT_STATUS_ACCESS_DENIED; + } + } + + if (NT_STATUS_IS_OK(status)) { es->enc_on = true; /* Replace the old state, if any. */ + /* We only need the gensec_security part from here. + * es is a malloc()ed pointer, so we cannot make + * gensec_security a talloc child */ + es->s.gensec_security = talloc_move(NULL, + &auth_generic_state->gensec_security); smb1cli_conn_set_encryption(cli->conn, es); es = NULL; } +fail: common_free_encryption_state(&es); return status; } -#else -NTSTATUS cli_gss_smb_encryption_start(struct cli_state *cli) -{ - return NT_STATUS_NOT_SUPPORTED; -} -#endif /******************************************************************** Ensure a connection is encrypted. diff --git a/source3/smbd/seal.c b/source3/smbd/seal.c index 41d1765189..28bf688924 100644 --- a/source3/smbd/seal.c +++ b/source3/smbd/seal.c @@ -86,125 +86,25 @@ static NTSTATUS make_auth_gensec(const struct tsocket_address *remote_address, gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL); - status = gensec_start_mech_by_oid(gensec_security, oid); - - if (!NT_STATUS_IS_OK(status)) { - TALLOC_FREE(gensec_security); - return nt_status_squash(status); - } - - es->s.gensec_security = gensec_security; - - return status; -} - -#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5) - -/****************************************************************************** - Import a name. -******************************************************************************/ - -static NTSTATUS get_srv_gss_creds(const char *service, - const char *name, - gss_cred_usage_t cred_type, - gss_cred_id_t *p_srv_cred) -{ - OM_uint32 ret; - OM_uint32 min; - gss_name_t srv_name; - gss_buffer_desc input_name; - char *host_princ_s = NULL; - NTSTATUS status = NT_STATUS_OK; - - gss_OID_desc nt_hostbased_service = - {10, discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")}; - - if (asprintf(&host_princ_s, "%s@%s", service, name) == -1) { - return NT_STATUS_NO_MEMORY; - } - - input_name.value = host_princ_s; - input_name.length = strlen(host_princ_s) + 1; - - ret = gss_import_name(&min, - &input_name, - &nt_hostbased_service, - &srv_name); - - DEBUG(10,("get_srv_gss_creds: imported name %s\n", - host_princ_s )); - - if (ret != GSS_S_COMPLETE) { - SAFE_FREE(host_princ_s); - return map_nt_error_from_gss(ret, min); - } - /* - * We're accessing the krb5.keytab file here. + * We could be accessing the secrets.tdb or krb5.keytab file here. * ensure we have permissions to do so. */ become_root(); - ret = gss_acquire_cred(&min, - srv_name, - GSS_C_INDEFINITE, - GSS_C_NULL_OID_SET, - cred_type, - p_srv_cred, - NULL, - NULL); - unbecome_root(); - - if (ret != GSS_S_COMPLETE) { - ADS_STATUS adss = ADS_ERROR_GSS(ret, min); - DEBUG(10,("get_srv_gss_creds: gss_acquire_cred failed with %s\n", - ads_errstr(adss))); - status = map_nt_error_from_gss(ret, min); - } - - SAFE_FREE(host_princ_s); - gss_release_name(&min, &srv_name); - return status; -} - -/****************************************************************************** - Create a gss state. - Try and get the cifs/server@realm principal first, then fall back to - host/server@realm. -******************************************************************************/ - -static NTSTATUS make_auth_gss(struct smb_trans_enc_state *es) -{ - NTSTATUS status; - gss_cred_id_t srv_cred; - fstring fqdn; + status = gensec_start_mech_by_oid(gensec_security, oid); - name_to_fqdn(fqdn, lp_netbios_name()); - strlower_m(fqdn); + unbecome_root(); - status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred); if (!NT_STATUS_IS_OK(status)) { - status = get_srv_gss_creds("host", fqdn, GSS_C_ACCEPT, &srv_cred); - if (!NT_STATUS_IS_OK(status)) { - return nt_status_squash(status); - } - } - - es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss); - if (!es->s.gss_state) { - OM_uint32 min; - gss_release_cred(&min, &srv_cred); - return NT_STATUS_NO_MEMORY; + TALLOC_FREE(gensec_security); + return nt_status_squash(status); } - ZERO_STRUCTP(es->s.gss_state); - es->s.gss_state->creds = srv_cred; - /* No context yet. */ - es->s.gss_state->gss_ctx = GSS_C_NO_CONTEXT; + es->s.gensec_security = gensec_security; - return NT_STATUS_OK; + return status; } -#endif /****************************************************************************** Shutdown a server encryption context. @@ -232,6 +132,8 @@ static NTSTATUS make_srv_encryption_context(const struct tsocket_address *remote enum smb_trans_enc_type smb_enc_type, struct smb_trans_enc_state **pp_es) { + NTSTATUS status; + const char *oid; struct smb_trans_enc_state *es; *pp_es = NULL; @@ -245,32 +147,21 @@ static NTSTATUS make_srv_encryption_context(const struct tsocket_address *remote es->smb_enc_type = smb_enc_type; switch (smb_enc_type) { case SMB_TRANS_ENC_NTLM: - { - NTSTATUS status = make_auth_gensec(remote_address, - es, GENSEC_OID_NTLMSSP); - if (!NT_STATUS_IS_OK(status)) { - srv_free_encryption_context(&es); - return status; - } - } + oid = GENSEC_OID_NTLMSSP; break; - -#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5) case SMB_TRANS_ENC_GSS: - /* Acquire our credentials by calling gss_acquire_cred here. */ - { - NTSTATUS status = make_auth_gss(es); - if (!NT_STATUS_IS_OK(status)) { - srv_free_encryption_context(&es); - return status; - } - } + oid = GENSEC_OID_KERBEROS5; break; -#endif default: srv_free_encryption_context(&es); return NT_STATUS_INVALID_PARAMETER; } + status = make_auth_gensec(remote_address, + es, oid); + if (!NT_STATUS_IS_OK(status)) { + srv_free_encryption_context(&es); + return status; + } *pp_es = es; return NT_STATUS_OK; } @@ -338,75 +229,35 @@ NTSTATUS srv_encrypt_buffer(struct smbd_server_connection *sconn, char *buf, Until success we do everything on the partial enc ctx. ******************************************************************************/ -#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5) static NTSTATUS srv_enc_spnego_gss_negotiate(const struct tsocket_address *remote_address, unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob) { - OM_uint32 ret; - OM_uint32 min; - OM_uint32 flags = 0; - gss_buffer_desc in_buf, out_buf; - struct smb_tran_enc_state_gss *gss_state; - DATA_BLOB auth_reply = data_blob_null; - DATA_BLOB response = data_blob_null; NTSTATUS status; + DATA_BLOB unwrapped_response = data_blob_null; + DATA_BLOB response = data_blob_null; - if (!partial_srv_trans_enc_ctx) { - status = make_srv_encryption_context(remote_address, - SMB_TRANS_ENC_GSS, - &partial_srv_trans_enc_ctx); - if (!NT_STATUS_IS_OK(status)) { - return status; - } + status = make_srv_encryption_context(remote_address, + SMB_TRANS_ENC_GSS, + &partial_srv_trans_enc_ctx); + if (!NT_STATUS_IS_OK(status)) { + return status; } - gss_state = partial_srv_trans_enc_ctx->s.gss_state; - - in_buf.value = secblob.data; - in_buf.length = secblob.length; - - out_buf.value = NULL; - out_buf.length = 0; - become_root(); - ret = gss_accept_sec_context(&min, - &gss_state->gss_ctx, - gss_state->creds, - &in_buf, - GSS_C_NO_CHANNEL_BINDINGS, - NULL, - NULL, /* Ignore oids. */ - &out_buf, /* To return. */ - &flags, - NULL, /* Ingore time. */ - NULL); /* Ignore delegated creds. */ - unbecome_root(); - - status = gss_err_to_ntstatus(ret, min); - if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) { - return status; - } + status = gensec_update(partial_srv_trans_enc_ctx->s.gensec_security, + talloc_tos(), NULL, + secblob, &unwrapped_response); - /* Ensure we've got sign+seal available. */ - if (ret == GSS_S_COMPLETE) { - if ((flags & (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) != - (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) { - DEBUG(0,("srv_enc_spnego_gss_negotiate: quality of service not good enough " - "for SMB sealing.\n")); - gss_release_buffer(&min, &out_buf); - return NT_STATUS_ACCESS_DENIED; - } - } + unbecome_root(); - auth_reply = data_blob(out_buf.value, out_buf.length); - gss_release_buffer(&min, &out_buf); + /* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED + * for success ... */ - /* Wrap in SPNEGO. */ - response = spnego_gen_auth_response(talloc_tos(), &auth_reply, status, OID_KERBEROS5); - data_blob_free(&auth_reply); + response = spnego_gen_auth_response(talloc_tos(), &unwrapped_response, status, OID_KERBEROS5); + data_blob_free(&unwrapped_response); SAFE_FREE(*ppdata); *ppdata = (unsigned char *)memdup(response.data, response.length); @@ -414,12 +265,10 @@ static NTSTATUS srv_enc_spnego_gss_negotiate(const struct tsocket_address *remot status = NT_STATUS_NO_MEMORY; } *p_data_size = response.length; - data_blob_free(&response); return status; } -#endif /****************************************************************************** Do the NTLM SPNEGO (or raw) encryption negotiation. Parameters are in/out. @@ -500,16 +349,10 @@ static NTSTATUS srv_enc_spnego_negotiate(connection_struct *conn, if (kerb_mech) { TALLOC_FREE(kerb_mech); -#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5) status = srv_enc_spnego_gss_negotiate(conn->sconn->remote_address, ppdata, p_data_size, secblob); -#else - /* Currently we don't SPNEGO negotiate - * back to NTLMSSP as we do in sessionsetupX. We should... */ - return NT_STATUS_LOGON_FAILURE; -#endif } else { status = srv_enc_ntlm_negotiate(conn->sconn->remote_address, ppdata, |