several new kerberos related libraries and applications to FreeBSD: o kgetcred(1) allows one to manually get a ticket for a particular service. o kf(1) securily forwards ticket to another host through an authenticated and encrypted stream. o kcc(1) is an umbrella program around klist(1), kswitch(1), kgetcred(1) and other user kerberos operations. klist and kswitch are just symlinks to kcc(1) now. o kswitch(1) allows you to easily switch between kerberos credentials if you're running KCM. o hxtool(1) is a certificate management tool to use with PKINIT. o string2key(1) maps a password into key. o kdigest(8) is a userland tool to access the KDC's digest interface. o kimpersonate(8) creates a "fake" ticket for a service. We also now install manpages for some lirbaries that were not installed before, libheimntlm and libhx509. - The new HEIMDAL version no longer supports Kerberos 4. All users are recommended to switch to Kerberos 5. - Weak ciphers are now disabled by default. To enable DES support (used by telnet(8)), use "allow_weak_crypto" option in krb5.conf. - libtelnet, pam_ksu and pam_krb5 are now compiled with error on warnings disabled due to the function they use (krb5_get_err_text(3)) being deprecated. I plan to work on this next. - Heimdal's KDC now require sqlite to operate. We use the bundled version and install it as libheimsqlite. If some other FreeBSD components will require it in the future we can rename it to libbsdsqlite and use for these components as well. - This is not a latest Heimdal version, the new one was released while I was working on the update. I will update it to 1.5.2 soon, as it fixes some important bugs and security issues.
217 lines
5.6 KiB
C
217 lines
5.6 KiB
C
/*
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* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kadm5_locl.h"
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RCSID("$Id$");
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static struct units acl_units[] = {
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{ "all", KADM5_PRIV_ALL },
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{ "change-password",KADM5_PRIV_CPW },
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{ "cpw", KADM5_PRIV_CPW },
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{ "list", KADM5_PRIV_LIST },
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{ "delete", KADM5_PRIV_DELETE },
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{ "modify", KADM5_PRIV_MODIFY },
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{ "add", KADM5_PRIV_ADD },
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{ "get", KADM5_PRIV_GET },
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{ NULL, 0 }
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};
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kadm5_ret_t
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_kadm5_string_to_privs(const char *s, uint32_t* privs)
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{
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int flags;
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flags = parse_flags(s, acl_units, 0);
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if(flags < 0)
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return KADM5_FAILURE;
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*privs = flags;
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return 0;
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}
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kadm5_ret_t
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_kadm5_privs_to_string(uint32_t privs, char *string, size_t len)
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{
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if(privs == 0)
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strlcpy(string, "none", len);
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else
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unparse_flags(privs, acl_units + 1, string, len);
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return 0;
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}
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/*
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* retrieve the right for the current caller on `princ' (NULL means all)
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* and store them in `ret_flags'
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* return 0 or an error.
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*/
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static kadm5_ret_t
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fetch_acl (kadm5_server_context *context,
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krb5_const_principal princ,
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unsigned *ret_flags)
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{
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FILE *f;
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krb5_error_code ret = 0;
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char buf[256];
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*ret_flags = 0;
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/* no acl file -> no rights */
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f = fopen(context->config.acl_file, "r");
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if (f == NULL)
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return 0;
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while(fgets(buf, sizeof(buf), f) != NULL) {
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char *foo = NULL, *p;
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krb5_principal this_princ;
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unsigned flags = 0;
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p = strtok_r(buf, " \t\n", &foo);
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if(p == NULL)
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continue;
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if (*p == '#') /* comment */
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continue;
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ret = krb5_parse_name(context->context, p, &this_princ);
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if(ret)
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break;
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if(!krb5_principal_compare(context->context,
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context->caller, this_princ)) {
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krb5_free_principal(context->context, this_princ);
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continue;
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}
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krb5_free_principal(context->context, this_princ);
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p = strtok_r(NULL, " \t\n", &foo);
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if(p == NULL)
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continue;
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ret = _kadm5_string_to_privs(p, &flags);
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if (ret)
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break;
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p = strtok_r(NULL, " \t\n", &foo);
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if (p == NULL) {
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*ret_flags = flags;
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break;
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}
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if (princ != NULL) {
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krb5_principal pattern_princ;
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krb5_boolean match;
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ret = krb5_parse_name (context->context, p, &pattern_princ);
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if (ret)
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break;
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match = krb5_principal_match (context->context,
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princ, pattern_princ);
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krb5_free_principal (context->context, pattern_princ);
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if (match) {
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*ret_flags = flags;
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break;
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}
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}
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}
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fclose(f);
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return ret;
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}
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/*
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* set global acl flags in `context' for the current caller.
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* return 0 on success or an error
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*/
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kadm5_ret_t
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_kadm5_acl_init(kadm5_server_context *context)
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{
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krb5_principal princ;
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krb5_error_code ret;
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ret = krb5_parse_name(context->context, KADM5_ADMIN_SERVICE, &princ);
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if (ret)
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return ret;
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ret = krb5_principal_compare(context->context, context->caller, princ);
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krb5_free_principal(context->context, princ);
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if(ret != 0) {
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context->acl_flags = KADM5_PRIV_ALL;
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return 0;
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}
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return fetch_acl (context, NULL, &context->acl_flags);
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}
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/*
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* check if `flags' allows `op'
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* return 0 if OK or an error
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*/
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static kadm5_ret_t
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check_flags (unsigned op,
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unsigned flags)
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{
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unsigned res = ~flags & op;
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if(res & KADM5_PRIV_GET)
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return KADM5_AUTH_GET;
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if(res & KADM5_PRIV_ADD)
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return KADM5_AUTH_ADD;
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if(res & KADM5_PRIV_MODIFY)
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return KADM5_AUTH_MODIFY;
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if(res & KADM5_PRIV_DELETE)
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return KADM5_AUTH_DELETE;
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if(res & KADM5_PRIV_CPW)
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return KADM5_AUTH_CHANGEPW;
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if(res & KADM5_PRIV_LIST)
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return KADM5_AUTH_LIST;
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if(res)
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return KADM5_AUTH_INSUFFICIENT;
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return 0;
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}
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/*
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* return 0 if the current caller in `context' is allowed to perform
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* `op' on `princ' and otherwise an error
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* princ == NULL if it's not relevant.
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*/
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kadm5_ret_t
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_kadm5_acl_check_permission(kadm5_server_context *context,
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unsigned op,
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krb5_const_principal princ)
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{
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kadm5_ret_t ret;
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unsigned princ_flags;
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ret = check_flags (op, context->acl_flags);
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if (ret == 0)
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return ret;
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ret = fetch_acl (context, princ, &princ_flags);
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if (ret)
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return ret;
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return check_flags (op, princ_flags);
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}
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