diff options
Diffstat (limited to 'source3/libads/kerberos.c')
| -rw-r--r-- | source3/libads/kerberos.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/source3/libads/kerberos.c b/source3/libads/kerberos.c new file mode 100644 index 0000000000..194a71275e --- /dev/null +++ b/source3/libads/kerberos.c @@ -0,0 +1,238 @@ +/* + Unix SMB/CIFS implementation. + kerberos utility library + Copyright (C) Andrew Tridgell 2001 + Copyright (C) Remus Koos 2001 + + + 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" + +#ifdef HAVE_KRB5 + +/* + simulate a kinit, putting the tgt in the default cache location + remus@snapserver.com +*/ +int kerberos_kinit_password(const char *principal, const char *password) +{ + krb5_context ctx; + krb5_error_code code = 0; + krb5_ccache cc; + krb5_principal me; + krb5_creds my_creds; + + if (! *password) { + /* kerberos dies on an empty password! */ + return KRB5_PARSE_MALFORMED; + } + + if ((code = krb5_init_context(&ctx))) + return code; + + if ((code = krb5_cc_default(ctx, &cc))) { + krb5_free_context(ctx); + return code; + } + + if ((code = krb5_parse_name(ctx, principal, &me))) { + krb5_free_context(ctx); + return code; + } + + if ((code = krb5_get_init_creds_password(ctx, &my_creds, me, (char*)password, NULL, + NULL, 0, NULL, NULL))) { + krb5_free_principal(ctx, me); + krb5_free_context(ctx); + return code; + } + + if ((code = krb5_cc_initialize(ctx, cc, me))) { + krb5_free_cred_contents(ctx, &my_creds); + krb5_free_principal(ctx, me); + krb5_free_context(ctx); + return code; + } + + if ((code = krb5_cc_store_cred(ctx, cc, &my_creds))) { + krb5_cc_close(ctx, cc); + krb5_free_cred_contents(ctx, &my_creds); + krb5_free_principal(ctx, me); + krb5_free_context(ctx); + return code; + } + + krb5_cc_close(ctx, cc); + krb5_free_cred_contents(ctx, &my_creds); + krb5_free_principal(ctx, me); + krb5_free_context(ctx); + + return 0; +} + + + +/* run kinit to setup our ccache */ +int ads_kinit_password(ADS_STRUCT *ads) +{ + char *s; + int ret; + + if (!ads->user_name) { + /* by default use the machine account */ + extern pstring global_myname; + fstring myname; + fstrcpy(myname, global_myname); + strlower(myname); + asprintf(&ads->user_name, "HOST/%s", global_myname); + } + asprintf(&s, "%s@%s", ads->user_name, ads->realm); + ret = kerberos_kinit_password(s, ads->password); + + if (ret) { + DEBUG(0,("kerberos_kinit_password %s failed: %s\n", + s, error_message(ret))); + } + free(s); + return ret; +} + +/* + verify an incoming ticket and parse out the principal name and + authorization_data if available +*/ +NTSTATUS ads_verify_ticket(ADS_STRUCT *ads, const DATA_BLOB *ticket, + char **principal, DATA_BLOB *auth_data) +{ + krb5_context context; + krb5_auth_context auth_context = NULL; + krb5_keytab keytab = NULL; + krb5_data packet; + krb5_ticket *tkt = NULL; + krb5_data salt; + krb5_encrypt_block eblock; + int ret; + krb5_keyblock * key; + krb5_principal host_princ; + char *host_princ_s; + extern pstring global_myname; + fstring myname; + char *password_s; + krb5_data password; + + if (!secrets_init()) { + DEBUG(1,("secrets_init failed\n")); + return NT_STATUS_LOGON_FAILURE; + } + + password_s = secrets_fetch_machine_password(); + if (!password_s) { + DEBUG(1,("failed to fetch machine password\n")); + return NT_STATUS_LOGON_FAILURE; + } + + password.data = password_s; + password.length = strlen(password_s); + + ret = krb5_init_context(&context); + if (ret) { + DEBUG(1,("krb5_init_context failed (%s)\n", error_message(ret))); + return NT_STATUS_LOGON_FAILURE; + } + + ret = krb5_set_default_realm(context, ads->realm); + if (ret) { + DEBUG(1,("krb5_set_default_realm failed (%s)\n", error_message(ret))); + ads_destroy(&ads); + return NT_STATUS_LOGON_FAILURE; + } + + /* this whole process is far more complex than I would + like. We have to go through all this to allow us to store + the secret internally, instead of using /etc/krb5.keytab */ + ret = krb5_auth_con_init(context, &auth_context); + if (ret) { + DEBUG(1,("krb5_auth_con_init failed (%s)\n", error_message(ret))); + return NT_STATUS_LOGON_FAILURE; + } + + fstrcpy(myname, global_myname); + strlower(myname); + asprintf(&host_princ_s, "HOST/%s@%s", myname, lp_realm()); + ret = krb5_parse_name(context, host_princ_s, &host_princ); + if (ret) { + DEBUG(1,("krb5_parse_name(%s) failed (%s)\n", host_princ_s, error_message(ret))); + return NT_STATUS_LOGON_FAILURE; + } + + ret = krb5_principal2salt(context, host_princ, &salt); + if (ret) { + DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret))); + return NT_STATUS_LOGON_FAILURE; + } + + if (!(key = (krb5_keyblock *)malloc(sizeof(*key)))) { + return NT_STATUS_NO_MEMORY; + } + + krb5_use_enctype(context, &eblock, ENCTYPE_DES_CBC_MD5); + + ret = krb5_string_to_key(context, &eblock, key, &password, &salt); + if (ret) { + DEBUG(1,("krb5_string_to_key failed (%s)\n", error_message(ret))); + return NT_STATUS_LOGON_FAILURE; + } + + krb5_auth_con_setuseruserkey(context, auth_context, key); + + packet.length = ticket->length; + packet.data = (krb5_pointer)ticket->data; + +#if 0 + file_save("/tmp/ticket.dat", ticket->data, ticket->length); +#endif + + if ((ret = krb5_rd_req(context, &auth_context, &packet, + NULL, keytab, NULL, &tkt))) { + DEBUG(3,("krb5_rd_req with auth failed (%s)\n", + error_message(ret))); + return NT_STATUS_LOGON_FAILURE; + } + + if (tkt->enc_part2) { + *auth_data = data_blob(tkt->enc_part2->authorization_data[0]->contents, + tkt->enc_part2->authorization_data[0]->length); + } + +#if 0 + if (tkt->enc_part2) { + file_save("/tmp/authdata.dat", + tkt->enc_part2->authorization_data[0]->contents, + tkt->enc_part2->authorization_data[0]->length); + } +#endif + + if ((ret = krb5_unparse_name(context, tkt->enc_part2->client, principal))) { + DEBUG(3,("krb5_unparse_name failed (%s)\n", + error_message(ret))); + return NT_STATUS_LOGON_FAILURE; + } + + return NT_STATUS_OK; +} + +#endif |