diff options
Diffstat (limited to 'crypto/heimdal/lib/gssapi/ntlm/init_sec_context.c')
| -rw-r--r-- | crypto/heimdal/lib/gssapi/ntlm/init_sec_context.c | 508 |
1 files changed, 508 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/gssapi/ntlm/init_sec_context.c b/crypto/heimdal/lib/gssapi/ntlm/init_sec_context.c new file mode 100644 index 0000000..140dbec --- /dev/null +++ b/crypto/heimdal/lib/gssapi/ntlm/init_sec_context.c @@ -0,0 +1,508 @@ +/* + * Copyright (c) 2006 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "ntlm/ntlm.h" + +RCSID("$Id: init_sec_context.c 22382 2007-12-30 12:13:17Z lha $"); + +static int +from_file(const char *fn, const char *target_domain, + char **username, struct ntlm_buf *key) +{ + char *str, buf[1024]; + FILE *f; + + f = fopen(fn, "r"); + if (f == NULL) + return ENOENT; + + while (fgets(buf, sizeof(buf), f) != NULL) { + char *d, *u, *p; + buf[strcspn(buf, "\r\n")] = '\0'; + if (buf[0] == '#') + continue; + str = NULL; + d = strtok_r(buf, ":", &str); + if (d && strcasecmp(target_domain, d) != 0) + continue; + u = strtok_r(NULL, ":", &str); + p = strtok_r(NULL, ":", &str); + if (u == NULL || p == NULL) + continue; + + *username = strdup(u); + + heim_ntlm_nt_key(p, key); + + memset(buf, 0, sizeof(buf)); + fclose(f); + return 0; + } + memset(buf, 0, sizeof(buf)); + fclose(f); + return ENOENT; +} + +static int +get_user_file(const ntlm_name target_name, + char **username, struct ntlm_buf *key) +{ + const char *fn; + + if (issuid()) + return ENOENT; + + fn = getenv("NTLM_USER_FILE"); + if (fn == NULL) + return ENOENT; + if (from_file(fn, target_name->domain, username, key) == 0) + return 0; + + return ENOENT; +} + +/* + * Pick up the ntlm cred from the default krb5 credential cache. + */ + +static int +get_user_ccache(const ntlm_name name, char **username, struct ntlm_buf *key) +{ + krb5_principal client; + krb5_context context = NULL; + krb5_error_code ret; + krb5_ccache id = NULL; + krb5_creds mcreds, creds; + + *username = NULL; + key->length = 0; + key->data = NULL; + + memset(&creds, 0, sizeof(creds)); + memset(&mcreds, 0, sizeof(mcreds)); + + ret = krb5_init_context(&context); + if (ret) + return ret; + + ret = krb5_cc_default(context, &id); + if (ret) + goto out; + + ret = krb5_cc_get_principal(context, id, &client); + if (ret) + goto out; + + ret = krb5_unparse_name_flags(context, client, + KRB5_PRINCIPAL_UNPARSE_NO_REALM, + username); + if (ret) + goto out; + + ret = krb5_make_principal(context, &mcreds.server, + krb5_principal_get_realm(context, client), + "@ntlm-key", name->domain, NULL); + krb5_free_principal(context, client); + if (ret) + goto out; + + mcreds.session.keytype = ENCTYPE_ARCFOUR_HMAC_MD5; + ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_MATCH_KEYTYPE, + &mcreds, &creds); + if (ret) { + char *s = krb5_get_error_message(context, ret); + krb5_free_error_string(context, s); + goto out; + } + + key->data = malloc(creds.session.keyvalue.length); + if (key->data == NULL) + goto out; + key->length = creds.session.keyvalue.length; + memcpy(key->data, creds.session.keyvalue.data, key->length); + + krb5_free_cred_contents(context, &creds); + + return 0; + +out: + if (*username) { + free(*username); + *username = NULL; + } + krb5_free_cred_contents(context, &creds); + if (mcreds.server) + krb5_free_principal(context, mcreds.server); + if (id) + krb5_cc_close(context, id); + if (context) + krb5_free_context(context); + + return ret; +} + +int +_gss_ntlm_get_user_cred(const ntlm_name target_name, + ntlm_cred *rcred) +{ + ntlm_cred cred; + int ret; + + cred = calloc(1, sizeof(*cred)); + if (cred == NULL) + return ENOMEM; + + ret = get_user_file(target_name, &cred->username, &cred->key); + if (ret) + ret = get_user_ccache(target_name, &cred->username, &cred->key); + if (ret) { + free(cred); + return ret; + } + + cred->domain = strdup(target_name->domain); + *rcred = cred; + + return ret; +} + +static int +_gss_copy_cred(ntlm_cred from, ntlm_cred *to) +{ + *to = calloc(1, sizeof(*to)); + if (*to == NULL) + return ENOMEM; + (*to)->username = strdup(from->username); + if ((*to)->username == NULL) { + free(*to); + return ENOMEM; + } + (*to)->domain = strdup(from->domain); + if ((*to)->domain == NULL) { + free((*to)->username); + free(*to); + return ENOMEM; + } + (*to)->key.data = malloc(from->key.length); + if ((*to)->key.data == NULL) { + free((*to)->domain); + free((*to)->username); + free(*to); + return ENOMEM; + } + memcpy((*to)->key.data, from->key.data, from->key.length); + (*to)->key.length = from->key.length; + + return 0; +} + +OM_uint32 +_gss_ntlm_init_sec_context + (OM_uint32 * minor_status, + const gss_cred_id_t initiator_cred_handle, + gss_ctx_id_t * context_handle, + const gss_name_t target_name, + const gss_OID mech_type, + OM_uint32 req_flags, + OM_uint32 time_req, + const gss_channel_bindings_t input_chan_bindings, + const gss_buffer_t input_token, + gss_OID * actual_mech_type, + gss_buffer_t output_token, + OM_uint32 * ret_flags, + OM_uint32 * time_rec + ) +{ + ntlm_ctx ctx; + ntlm_name name = (ntlm_name)target_name; + + *minor_status = 0; + + if (ret_flags) + *ret_flags = 0; + if (time_rec) + *time_rec = 0; + if (actual_mech_type) + *actual_mech_type = GSS_C_NO_OID; + + if (*context_handle == GSS_C_NO_CONTEXT) { + struct ntlm_type1 type1; + struct ntlm_buf data; + uint32_t flags = 0; + int ret; + + ctx = calloc(1, sizeof(*ctx)); + if (ctx == NULL) { + *minor_status = EINVAL; + return GSS_S_FAILURE; + } + *context_handle = (gss_ctx_id_t)ctx; + + if (initiator_cred_handle != GSS_C_NO_CREDENTIAL) { + ntlm_cred cred = (ntlm_cred)initiator_cred_handle; + ret = _gss_copy_cred(cred, &ctx->client); + } else + ret = _gss_ntlm_get_user_cred(name, &ctx->client); + + if (ret) { + _gss_ntlm_delete_sec_context(minor_status, context_handle, NULL); + *minor_status = ret; + return GSS_S_FAILURE; + } + + if (req_flags & GSS_C_CONF_FLAG) + flags |= NTLM_NEG_SEAL; + if (req_flags & GSS_C_INTEG_FLAG) + flags |= NTLM_NEG_SIGN; + else + flags |= NTLM_NEG_ALWAYS_SIGN; + + flags |= NTLM_NEG_UNICODE; + flags |= NTLM_NEG_NTLM; + flags |= NTLM_NEG_NTLM2_SESSION; + flags |= NTLM_NEG_KEYEX; + + memset(&type1, 0, sizeof(type1)); + + type1.flags = flags; + type1.domain = name->domain; + type1.hostname = NULL; + type1.os[0] = 0; + type1.os[1] = 0; + + ret = heim_ntlm_encode_type1(&type1, &data); + if (ret) { + _gss_ntlm_delete_sec_context(minor_status, context_handle, NULL); + *minor_status = ret; + return GSS_S_FAILURE; + } + + output_token->value = data.data; + output_token->length = data.length; + + return GSS_S_CONTINUE_NEEDED; + } else { + krb5_error_code ret; + struct ntlm_type2 type2; + struct ntlm_type3 type3; + struct ntlm_buf data; + + ctx = (ntlm_ctx)*context_handle; + + data.data = input_token->value; + data.length = input_token->length; + + ret = heim_ntlm_decode_type2(&data, &type2); + if (ret) { + _gss_ntlm_delete_sec_context(minor_status, context_handle, NULL); + *minor_status = ret; + return GSS_S_FAILURE; + } + + ctx->flags = type2.flags; + + /* XXX check that type2.targetinfo matches `target_name´ */ + /* XXX check verify targetinfo buffer */ + + memset(&type3, 0, sizeof(type3)); + + type3.username = ctx->client->username; + type3.flags = type2.flags; + type3.targetname = type2.targetname; + type3.ws = rk_UNCONST("workstation"); + + /* + * NTLM Version 1 if no targetinfo buffer. + */ + + if (1 || type2.targetinfo.length == 0) { + struct ntlm_buf sessionkey; + + if (type2.flags & NTLM_NEG_NTLM2_SESSION) { + unsigned char nonce[8]; + + if (RAND_bytes(nonce, sizeof(nonce)) != 1) { + _gss_ntlm_delete_sec_context(minor_status, + context_handle, NULL); + *minor_status = EINVAL; + return GSS_S_FAILURE; + } + + ret = heim_ntlm_calculate_ntlm2_sess(nonce, + type2.challange, + ctx->client->key.data, + &type3.lm, + &type3.ntlm); + } else { + ret = heim_ntlm_calculate_ntlm1(ctx->client->key.data, + ctx->client->key.length, + type2.challange, + &type3.ntlm); + + } + if (ret) { + _gss_ntlm_delete_sec_context(minor_status,context_handle,NULL); + *minor_status = ret; + return GSS_S_FAILURE; + } + + ret = heim_ntlm_build_ntlm1_master(ctx->client->key.data, + ctx->client->key.length, + &sessionkey, + &type3.sessionkey); + if (ret) { + if (type3.lm.data) + free(type3.lm.data); + if (type3.ntlm.data) + free(type3.ntlm.data); + _gss_ntlm_delete_sec_context(minor_status,context_handle,NULL); + *minor_status = ret; + return GSS_S_FAILURE; + } + + ret = krb5_data_copy(&ctx->sessionkey, + sessionkey.data, sessionkey.length); + free(sessionkey.data); + if (ret) { + if (type3.lm.data) + free(type3.lm.data); + if (type3.ntlm.data) + free(type3.ntlm.data); + _gss_ntlm_delete_sec_context(minor_status,context_handle,NULL); + *minor_status = ret; + return GSS_S_FAILURE; + } + ctx->status |= STATUS_SESSIONKEY; + + } else { + struct ntlm_buf sessionkey; + unsigned char ntlmv2[16]; + struct ntlm_targetinfo ti; + + /* verify infotarget */ + + ret = heim_ntlm_decode_targetinfo(&type2.targetinfo, 1, &ti); + if(ret) { + _gss_ntlm_delete_sec_context(minor_status, + context_handle, NULL); + *minor_status = ret; + return GSS_S_FAILURE; + } + + if (ti.domainname && strcmp(ti.domainname, name->domain) != 0) { + _gss_ntlm_delete_sec_context(minor_status, + context_handle, NULL); + *minor_status = EINVAL; + return GSS_S_FAILURE; + } + + ret = heim_ntlm_calculate_ntlm2(ctx->client->key.data, + ctx->client->key.length, + ctx->client->username, + name->domain, + type2.challange, + &type2.targetinfo, + ntlmv2, + &type3.ntlm); + if (ret) { + _gss_ntlm_delete_sec_context(minor_status, + context_handle, NULL); + *minor_status = ret; + return GSS_S_FAILURE; + } + + ret = heim_ntlm_build_ntlm1_master(ntlmv2, sizeof(ntlmv2), + &sessionkey, + &type3.sessionkey); + memset(ntlmv2, 0, sizeof(ntlmv2)); + if (ret) { + _gss_ntlm_delete_sec_context(minor_status, + context_handle, NULL); + *minor_status = ret; + return GSS_S_FAILURE; + } + + ctx->flags |= NTLM_NEG_NTLM2_SESSION; + + ret = krb5_data_copy(&ctx->sessionkey, + sessionkey.data, sessionkey.length); + free(sessionkey.data); + } + + if (ctx->flags & NTLM_NEG_NTLM2_SESSION) { + ctx->status |= STATUS_SESSIONKEY; + _gss_ntlm_set_key(&ctx->u.v2.send, 0, (ctx->flags & NTLM_NEG_KEYEX), + ctx->sessionkey.data, + ctx->sessionkey.length); + _gss_ntlm_set_key(&ctx->u.v2.recv, 1, (ctx->flags & NTLM_NEG_KEYEX), + ctx->sessionkey.data, + ctx->sessionkey.length); + } else { + ctx->status |= STATUS_SESSIONKEY; + RC4_set_key(&ctx->u.v1.crypto_recv.key, + ctx->sessionkey.length, + ctx->sessionkey.data); + RC4_set_key(&ctx->u.v1.crypto_send.key, + ctx->sessionkey.length, + ctx->sessionkey.data); + } + + + + ret = heim_ntlm_encode_type3(&type3, &data); + free(type3.sessionkey.data); + if (type3.lm.data) + free(type3.lm.data); + if (type3.ntlm.data) + free(type3.ntlm.data); + if (ret) { + _gss_ntlm_delete_sec_context(minor_status, context_handle, NULL); + *minor_status = ret; + return GSS_S_FAILURE; + } + + output_token->length = data.length; + output_token->value = data.data; + + if (actual_mech_type) + *actual_mech_type = GSS_NTLM_MECHANISM; + if (ret_flags) + *ret_flags = 0; + if (time_rec) + *time_rec = GSS_C_INDEFINITE; + + ctx->status |= STATUS_OPEN; + + return GSS_S_COMPLETE; + } +} |
