From 740ee4a8977512c03800ef88603cf65fd044443b Mon Sep 17 00:00:00 2001 From: Andrew Bartlett Date: Sat, 1 Jan 2005 00:19:08 +0000 Subject: r4460: Add a new GENSEC module: gensec_gssapi (disabled by default, set parametric option: gensec:gssapi=yes to enable). This module backs directly onto GSSAPI, and allows us to sign and seal GSSAPI/Krb5 connections in particular. This avoids me reinventing the entire GSSAPI wheel. Currently a lot of things are left as default - we will soon start specifiying OIDs as well as passwords (it uses the keytab only at the moment). Tested with our LDAP-* torture tests against Win2k3. My hope is to use this module to access the new SPNEGO implementation in Heimdal, to avoid having to standards-verify our own. Andrew Bartlett (This used to be commit 14b650c85db14a9bf97e24682b2643b63c51ff35) --- source4/libcli/auth/gensec.mk | 10 ++ source4/libcli/auth/gensec_gssapi.c | 336 ++++++++++++++++++++++++++++++++++++ source4/libcli/auth/spnego.c | 28 ++- 3 files changed, 368 insertions(+), 6 deletions(-) create mode 100644 source4/libcli/auth/gensec_gssapi.c (limited to 'source4/libcli/auth') diff --git a/source4/libcli/auth/gensec.mk b/source4/libcli/auth/gensec.mk index 66abfd10b7..b66006ce4f 100644 --- a/source4/libcli/auth/gensec.mk +++ b/source4/libcli/auth/gensec.mk @@ -23,6 +23,16 @@ REQUIRED_SUBSYSTEMS = NDR_KRB5PAC EXT_LIB_KRB5 # End MODULE gensec_krb5 ################################################ +################################################ +# Start MODULE gensec_gssapi +[MODULE::gensec_gssapi] +SUBSYSTEM = GENSEC +INIT_FUNCTION = gensec_gssapi_init +INIT_OBJ_FILES = libcli/auth/gensec_gssapi.o +REQUIRED_SUBSYSTEMS = EXT_LIB_KRB5 +# End MODULE gensec_gssapi +################################################ + ################################################ # Start MODULE gensec_spnego [MODULE::gensec_spnego] diff --git a/source4/libcli/auth/gensec_gssapi.c b/source4/libcli/auth/gensec_gssapi.c new file mode 100644 index 0000000000..c41c3fb2bc --- /dev/null +++ b/source4/libcli/auth/gensec_gssapi.c @@ -0,0 +1,336 @@ +/* + Unix SMB/CIFS implementation. + + Kerberos backend for GENSEC + + Copyright (C) Andrew Bartlett 2004 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" +#include "system/kerberos.h" +#include "system/time.h" +#include "libcli/auth/kerberos.h" +#include "auth/auth.h" + +#undef DBGC_CLASS +#define DBGC_CLASS DBGC_AUTH + +struct gensec_gssapi_state { + gss_ctx_id_t gssapi_context; + struct gss_channel_bindings_struct *input_chan_bindings; + gss_name_t server_name; + gss_name_t client_name; + int want_flags, got_flags; +}; +static int gensec_gssapi_destory(void *ptr) +{ + struct gensec_gssapi_state *gensec_gssapi_state = ptr; + OM_uint32 maj_stat, min_stat; + + if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) { + maj_stat = gss_delete_sec_context (&min_stat, + &gensec_gssapi_state->gssapi_context, + GSS_C_NO_BUFFER); + } + + if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) { + maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name); + } + if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) { + maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name); + } + return 0; +} + +static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security) +{ + struct gensec_gssapi_state *gensec_gssapi_state; + + gensec_gssapi_state = talloc_p(gensec_security, struct gensec_gssapi_state); + if (!gensec_gssapi_state) { + return NT_STATUS_NO_MEMORY; + } + + gensec_security->private_data = gensec_gssapi_state; + + gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT; + gensec_gssapi_state->server_name = GSS_C_NO_NAME; + gensec_gssapi_state->client_name = GSS_C_NO_NAME; + + talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destory); + + /* TODO: Fill in channel bindings */ + gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS; + + gensec_gssapi_state->want_flags = 0; + gensec_gssapi_state->got_flags = 0; + + if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) { + /* GSSAPI won't give us the session keys */ + return NT_STATUS_INVALID_PARAMETER; + } + if (gensec_security->want_features & GENSEC_FEATURE_SIGN) { + gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG; + } + if (gensec_security->want_features & GENSEC_FEATURE_SEAL) { + gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG; + } + + return NT_STATUS_OK; +} + +static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security) +{ + NTSTATUS nt_status; + struct gensec_gssapi_state *gensec_gssapi_state; + + nt_status = gensec_gssapi_start(gensec_security); + if (!NT_STATUS_IS_OK(nt_status)) { + return nt_status; + } + + gensec_gssapi_state = gensec_security->private_data; + + return NT_STATUS_OK; +} + +static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security) +{ + struct gensec_gssapi_state *gensec_gssapi_state; + NTSTATUS nt_status; + gss_buffer_desc name_token; + OM_uint32 maj_stat, min_stat; + + nt_status = gensec_gssapi_start(gensec_security); + if (!NT_STATUS_IS_OK(nt_status)) { + return nt_status; + } + + gensec_gssapi_state = gensec_security->private_data; + + name_token.value = talloc_asprintf(gensec_gssapi_state, "%s@%s", gensec_get_target_service(gensec_security), + gensec_get_target_hostname(gensec_security)); + DEBUG(0, ("name: %s\n", (char *)name_token.value)); + name_token.length = strlen(name_token.value); + + maj_stat = gss_import_name (&min_stat, + &name_token, + GSS_C_NT_HOSTBASED_SERVICE, + &gensec_gssapi_state->server_name); + + + if (maj_stat) { + return NT_STATUS_UNSUCCESSFUL; + } + return NT_STATUS_OK; +} + + + +/** + * Next state function for the GSSAPI GENSEC mechanism + * + * @param gensec_gssapi_state GSSAPI State + * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on + * @param in The request, as a DATA_BLOB + * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx + * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent, + * or NT_STATUS_OK if the user is authenticated. + */ + +static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security, + TALLOC_CTX *out_mem_ctx, + const DATA_BLOB in, DATA_BLOB *out) +{ + struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data; + NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL; + OM_uint32 maj_stat, min_stat; + OM_uint32 min_stat2; + gss_buffer_desc input_token, output_token; + + input_token.length = in.length; + input_token.value = in.data; + + switch (gensec_security->gensec_role) { + case GENSEC_CLIENT: + { + maj_stat = gss_init_sec_context(&min_stat, + GSS_C_NO_CREDENTIAL, + &gensec_gssapi_state->gssapi_context, + gensec_gssapi_state->server_name, + GSS_C_NO_OID, + gensec_gssapi_state->want_flags, + 0, + gensec_gssapi_state->input_chan_bindings, + &input_token, + NULL, + &output_token, + &gensec_gssapi_state->got_flags, /* ret flags */ + NULL); + break; + } + case GENSEC_SERVER: + { + maj_stat = gss_accept_sec_context(&min_stat, + gensec_gssapi_state->gssapi_context, + GSS_C_NO_CREDENTIAL, + &input_token, + gensec_gssapi_state->input_chan_bindings, + &gensec_gssapi_state->client_name, + NULL /* mech oid */, + &output_token, + &gensec_gssapi_state->got_flags, + NULL, + NULL); + break; + } + default: + return NT_STATUS_INVALID_PARAMETER; + + } + + *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length); + gss_release_buffer(&min_stat2, &output_token); + + if (maj_stat == GSS_S_COMPLETE) { + return NT_STATUS_OK; + } else if (maj_stat == GSS_S_CONTINUE_NEEDED) { + return NT_STATUS_MORE_PROCESSING_REQUIRED; + } else { + gss_buffer_desc msg1, msg2; + OM_uint32 msg_ctx = 0; + + msg1.value = NULL; + msg2.value = NULL; + gss_display_status(&min_stat2, maj_stat, GSS_C_GSS_CODE, + GSS_C_NULL_OID, &msg_ctx, &msg1); + gss_display_status(&min_stat2, min_stat, GSS_C_MECH_CODE, + GSS_C_NULL_OID, &msg_ctx, &msg2); + DEBUG(1, ("gensec_gssapi_update: %s : %s\n", (char *)msg1.value, (char *)msg2.value)); + gss_release_buffer(&min_stat2, &msg1); + gss_release_buffer(&min_stat2, &msg2); + + return nt_status; + } + +} + +static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security, + TALLOC_CTX *mem_ctx, + const DATA_BLOB *in, + DATA_BLOB *out) +{ + struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data; + OM_uint32 maj_stat, min_stat; + gss_buffer_desc input_token, output_token; + int conf_state; + input_token.length = in->length; + input_token.value = in->data; + + maj_stat = gss_wrap(&min_stat, + gensec_gssapi_state->gssapi_context, + gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL), + GSS_C_QOP_DEFAULT, + &input_token, + &conf_state, + &output_token); + if (GSS_ERROR(maj_stat)) { + return NT_STATUS_ACCESS_DENIED; + } + *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length); + + gss_release_buffer(&min_stat, &output_token); + + if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL) + && !conf_state) { + return NT_STATUS_ACCESS_DENIED; + } + return NT_STATUS_OK; +} + +static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security, + TALLOC_CTX *mem_ctx, + const DATA_BLOB *in, + DATA_BLOB *out) +{ + struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data; + OM_uint32 maj_stat, min_stat; + gss_buffer_desc input_token, output_token; + int conf_state; + gss_qop_t qop_state; + input_token.length = in->length; + input_token.value = in->data; + + maj_stat = gss_unwrap(&min_stat, + gensec_gssapi_state->gssapi_context, + &input_token, + &output_token, + &conf_state, + &qop_state); + if (GSS_ERROR(maj_stat)) { + return NT_STATUS_ACCESS_DENIED; + } + *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length); + + gss_release_buffer(&min_stat, &output_token); + + if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL) + && !conf_state) { + return NT_STATUS_ACCESS_DENIED; + } + return NT_STATUS_OK; +} + +static BOOL gensec_gssapi_have_feature(struct gensec_security *gensec_security, + uint32 feature) +{ + struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data; + if (feature & GENSEC_FEATURE_SIGN) { + return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG; + } + if (feature & GENSEC_FEATURE_SEAL) { + return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG; + } + return False; +} + +static const struct gensec_security_ops gensec_gssapi_security_ops = { + .name = "gssapi", + .oid = GENSEC_OID_KERBEROS5, + .client_start = gensec_gssapi_client_start, + .server_start = gensec_gssapi_server_start, + .update = gensec_gssapi_update, + .wrap = gensec_gssapi_wrap, + .unwrap = gensec_gssapi_unwrap, + .have_feature = gensec_gssapi_have_feature + +}; + +NTSTATUS gensec_gssapi_init(void) +{ + NTSTATUS ret; + + ret = gensec_register(&gensec_gssapi_security_ops); + if (!NT_STATUS_IS_OK(ret)) { + DEBUG(0,("Failed to register '%s' gensec backend!\n", + gensec_gssapi_security_ops.name)); + return ret; + } + + return ret; +} diff --git a/source4/libcli/auth/spnego.c b/source4/libcli/auth/spnego.c index f13bbc11b4..8b4be6eb75 100644 --- a/source4/libcli/auth/spnego.c +++ b/source4/libcli/auth/spnego.c @@ -42,6 +42,7 @@ struct spnego_state { enum spnego_message_type expected_packet; enum spnego_state_position state_position; struct gensec_security *sub_sec_security; + BOOL no_response_expected; }; @@ -57,6 +58,7 @@ static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_securi spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT; spnego_state->state_position = SPNEGO_CLIENT_START; spnego_state->sub_sec_security = NULL; + spnego_state->no_response_expected = False; gensec_security->private_data = spnego_state; return NT_STATUS_OK; @@ -74,6 +76,7 @@ static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_securi spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT; spnego_state->state_position = SPNEGO_SERVER_START; spnego_state->sub_sec_security = NULL; + spnego_state->no_response_expected = False; gensec_security->private_data = spnego_state; return NT_STATUS_OK; @@ -374,7 +377,7 @@ static NTSTATUS gensec_spnego_client_negTokenInit(struct gensec_security *gensec } nt_status = gensec_update(spnego_state->sub_sec_security, out_mem_ctx, in, &unwrapped_out); - if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) { + if (NT_STATUS_IS_OK(nt_status) || NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) { struct spnego_data spnego_out; spnego_out.type = SPNEGO_NEG_TOKEN_INIT; spnego_out.negTokenInit.mechTypes = mechTypes; @@ -390,7 +393,12 @@ static NTSTATUS gensec_spnego_client_negTokenInit(struct gensec_security *gensec /* set next state */ spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG; spnego_state->state_position = SPNEGO_CLIENT_TARG; - return nt_status; + + if (NT_STATUS_IS_OK(nt_status)) { + spnego_state->no_response_expected = True; + } + + return NT_STATUS_MORE_PROCESSING_REQUIRED; } talloc_free(spnego_state->sub_sec_security); spnego_state->sub_sec_security = NULL; @@ -601,6 +609,10 @@ static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TA /* set next state */ spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG; spnego_state->state_position = SPNEGO_CLIENT_TARG; + + if (NT_STATUS_IS_OK(nt_status)) { + spnego_state->no_response_expected = True; + } return NT_STATUS_MORE_PROCESSING_REQUIRED; } @@ -672,10 +684,14 @@ static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TA return NT_STATUS_ACCESS_DENIED; } - nt_status = gensec_update(spnego_state->sub_sec_security, - out_mem_ctx, - spnego.negTokenTarg.responseToken, - &unwrapped_out); + if (spnego_state->no_response_expected) { + nt_status = NT_STATUS_OK; + } else { + nt_status = gensec_update(spnego_state->sub_sec_security, + out_mem_ctx, + spnego.negTokenTarg.responseToken, + &unwrapped_out); + } if (NT_STATUS_IS_OK(nt_status) -- cgit