/* $NetBSD: afskrb5.c,v 1.2.22.1 2023/08/11 13:40:00 martin Exp $ */ /* * Copyright (c) 1995-2003 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 "kafs_locl.h" struct krb5_kafs_data { krb5_context context; krb5_ccache id; krb5_const_realm realm; }; enum { KAFS_RXKAD_2B_KVNO = 213, KAFS_RXKAD_K5_KVNO = 256 }; static int v5_to_kt(krb5_creds *cred, uid_t uid, struct kafs_token *kt, int local524) { int kvno, ret; kt->ticket = NULL; if (local524) { Ticket t; unsigned char *buf; size_t buf_len; size_t len; kvno = KAFS_RXKAD_2B_KVNO; ret = decode_Ticket(cred->ticket.data, cred->ticket.length, &t, &len); if (ret) return ret; if (t.tkt_vno != 5) return -1; ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_len, &t.enc_part, &len, ret); free_Ticket(&t); if (ret) return ret; if(buf_len != len) { free(buf); return KRB5KRB_ERR_GENERIC; } kt->ticket = buf; kt->ticket_len = buf_len; } else { kvno = KAFS_RXKAD_K5_KVNO; kt->ticket = malloc(cred->ticket.length); if (kt->ticket == NULL) return ENOMEM; kt->ticket_len = cred->ticket.length; memcpy(kt->ticket, cred->ticket.data, kt->ticket_len); } /* * Build a struct ClearToken */ ret = _kafs_derive_des_key(cred->session.keytype, cred->session.keyvalue.data, cred->session.keyvalue.length, kt->ct.HandShakeKey); if (ret) { free(kt->ticket); kt->ticket = NULL; return ret; } kt->ct.AuthHandle = kvno; kt->ct.ViceId = uid; kt->ct.BeginTimestamp = cred->times.starttime; kt->ct.EndTimestamp = cred->times.endtime; _kafs_fixup_viceid(&kt->ct, uid); return 0; } static krb5_error_code v5_convert(krb5_context context, krb5_ccache id, krb5_creds *cred, uid_t uid, const char *cell, struct kafs_token *kt) { krb5_error_code ret; char *c, *val; c = strdup(cell); if (c == NULL) return ENOMEM; _kafs_foldup(c, c); krb5_appdefault_string (context, "libkafs", c, "afs-use-524", "2b", &val); free(c); if (strcasecmp(val, "local") == 0 || strcasecmp(val, "2b") == 0) ret = v5_to_kt(cred, uid, kt, 1); else ret = v5_to_kt(cred, uid, kt, 0); free(val); return ret; } /* * */ static int get_cred(struct kafs_data *data, const char *name, const char *inst, const char *realm, uid_t uid, struct kafs_token *kt) { krb5_error_code ret; krb5_creds in_creds, *out_creds; struct krb5_kafs_data *d = data->data; int invalid; memset(&in_creds, 0, sizeof(in_creds)); ret = krb5_make_principal(d->context, &in_creds.server, realm, name, inst, NULL); if(ret) return ret; ret = krb5_cc_get_principal(d->context, d->id, &in_creds.client); if(ret){ krb5_free_principal(d->context, in_creds.server); return ret; } /* check if des is disable, and in that case enable it for afs */ invalid = krb5_enctype_valid(d->context, ETYPE_DES_CBC_CRC); if (invalid) krb5_enctype_enable(d->context, ETYPE_DES_CBC_CRC); ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds); if (invalid) krb5_enctype_disable(d->context, ETYPE_DES_CBC_CRC); krb5_free_principal(d->context, in_creds.server); krb5_free_principal(d->context, in_creds.client); if(ret) return ret; ret = v5_convert(d->context, d->id, out_creds, uid, (inst != NULL && inst[0] != '\0') ? inst : realm, kt); krb5_free_creds(d->context, out_creds); return ret; } static const char * get_error(struct kafs_data *data, int error) { struct krb5_kafs_data *d = data->data; return krb5_get_error_message(d->context, error); } static void free_error(struct kafs_data *data, const char *str) { struct krb5_kafs_data *d = data->data; krb5_free_error_message(d->context, str); } static krb5_error_code afslog_uid_int(struct kafs_data *data, const char *cell, const char *rh, uid_t uid, const char *homedir) { krb5_error_code ret; struct kafs_token kt; krb5_principal princ; const char *trealm; /* ticket realm */ struct krb5_kafs_data *d = data->data; if (cell == 0 || cell[0] == 0) return _kafs_afslog_all_local_cells (data, uid, homedir); ret = krb5_cc_get_principal (d->context, d->id, &princ); if (ret) return ret; trealm = krb5_principal_get_realm (d->context, princ); kt.ticket = NULL; ret = _kafs_get_cred(data, cell, d->realm, trealm, uid, &kt); krb5_free_principal (d->context, princ); if(ret == 0) { ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len); free(kt.ticket); } return ret; } static char * get_realm(struct kafs_data *data, const char *host) { struct krb5_kafs_data *d = data->data; krb5_realm *realms; char *r; if(krb5_get_host_realm(d->context, host, &realms)) return NULL; r = strdup(realms[0]); krb5_free_host_realm(d->context, realms); return r; } krb5_error_code krb5_afslog_uid_home(krb5_context context, krb5_ccache id, const char *cell, krb5_const_realm realm, uid_t uid, const char *homedir) { struct kafs_data kd; struct krb5_kafs_data d; krb5_error_code ret; kd.name = "krb5"; kd.afslog_uid = afslog_uid_int; kd.get_cred = get_cred; kd.get_realm = get_realm; kd.get_error = get_error; kd.free_error = free_error; kd.data = &d; if (context == NULL) { ret = krb5_init_context(&d.context); if (ret) return ret; } else d.context = context; if (id == NULL) { ret = krb5_cc_default(d.context, &d.id); if (ret) goto out; } else d.id = id; d.realm = realm; ret = afslog_uid_int(&kd, cell, 0, uid, homedir); if (id == NULL) krb5_cc_close(context, d.id); out: if (context == NULL) krb5_free_context(d.context); return ret; } krb5_error_code krb5_afslog_uid(krb5_context context, krb5_ccache id, const char *cell, krb5_const_realm realm, uid_t uid) { return krb5_afslog_uid_home (context, id, cell, realm, uid, NULL); } krb5_error_code krb5_afslog(krb5_context context, krb5_ccache id, const char *cell, krb5_const_realm realm) { return krb5_afslog_uid (context, id, cell, realm, getuid()); } krb5_error_code krb5_afslog_home(krb5_context context, krb5_ccache id, const char *cell, krb5_const_realm realm, const char *homedir) { return krb5_afslog_uid_home (context, id, cell, realm, getuid(), homedir); } /* * */ krb5_error_code krb5_realm_of_cell(const char *cell, char **realm) { struct kafs_data kd; kd.name = "krb5"; kd.get_realm = get_realm; kd.get_error = get_error; kd.free_error = free_error; return _kafs_realm_of_cell(&kd, cell, realm); } /* * */ int kafs_settoken5(krb5_context context, const char *cell, uid_t uid, krb5_creds *cred) { struct kafs_token kt; int ret; ret = v5_convert(context, NULL, cred, uid, cell, &kt); if (ret) return ret; ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len); free(kt.ticket); return ret; }