diff options
Diffstat (limited to 'source4/auth/gensec/gensec_gssapi.c')
| -rw-r--r-- | source4/auth/gensec/gensec_gssapi.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/source4/auth/gensec/gensec_gssapi.c b/source4/auth/gensec/gensec_gssapi.c new file mode 100644 index 0000000000..c974b93952 --- /dev/null +++ b/source4/auth/gensec/gensec_gssapi.c @@ -0,0 +1,376 @@ +/* + Unix SMB/CIFS implementation. + + Kerberos backend for GENSEC + + Copyright (C) Andrew Bartlett <abartlet@samba.org> 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 "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; + OM_uint32 want_flags, got_flags; + const gss_OID_desc *gss_oid; +}; +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(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; + } + + if (strcmp(gensec_security->ops->oid, GENSEC_OID_KERBEROS5) == 0) { + static const gss_OID_desc gensec_gss_krb5_mechanism_oid_desc = + {9, (void *)discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02")}; + + gensec_gssapi_state->gss_oid = &gensec_gss_krb5_mechanism_oid_desc; + } else if (strcmp(gensec_security->ops->oid, GENSEC_OID_SPNEGO) == 0) { + static const gss_OID_desc gensec_gss_spnego_mechanism_oid_desc = + {6, (void *)discard_const_p(char, "\x2b\x06\x01\x05\x05\x02")}; + gensec_gssapi_state->gss_oid = &gensec_gss_spnego_mechanism_oid_desc; + } else { + return NT_STATUS_INVALID_PARAMETER; + } + + 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; + + gss_OID_desc hostbased = {10, + (void *)discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12" + "\x01\x02\x01\x04")}; + + 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, + &hostbased, + &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; + gss_OID gss_oid_p; + 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, + discard_const_p(gss_OID_desc, gensec_gssapi_state->gss_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, + &gss_oid_p, + &output_token, + &gensec_gssapi_state->got_flags, + NULL, + NULL); + gensec_gssapi_state->gss_oid = gss_oid_p; + 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_t 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; +} + +/* As a server, this could in theory accept any GSSAPI mech */ +static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = { + .name = "gssapi_krb5", + .sasl_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, + .enabled = False + +}; + +static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = { + .name = "gssapi_spnego", + .sasl_name = "GSS-SPNEGO", + .oid = GENSEC_OID_SPNEGO, + .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, + .enabled = False +}; + +NTSTATUS gensec_gssapi_init(void) +{ + NTSTATUS ret; + + ret = gensec_register(&gensec_gssapi_krb5_security_ops); + if (!NT_STATUS_IS_OK(ret)) { + DEBUG(0,("Failed to register '%s' gensec backend!\n", + gensec_gssapi_krb5_security_ops.name)); + return ret; + } + + ret = gensec_register(&gensec_gssapi_spnego_security_ops); + if (!NT_STATUS_IS_OK(ret)) { + DEBUG(0,("Failed to register '%s' gensec backend!\n", + gensec_gssapi_spnego_security_ops.name)); + return ret; + } + + return ret; +} |