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.
636 lines
14 KiB
C
636 lines
14 KiB
C
/*
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* Copyright (c) 2006 - 2007 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 "krb5_locl.h"
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#ifdef HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif
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#include <dirent.h>
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struct krb5_plugin {
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void *symbol;
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struct krb5_plugin *next;
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};
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struct plugin {
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enum { DSO, SYMBOL } type;
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union {
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struct {
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char *path;
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void *dsohandle;
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} dso;
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struct {
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enum krb5_plugin_type type;
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char *name;
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char *symbol;
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} symbol;
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} u;
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struct plugin *next;
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};
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static HEIMDAL_MUTEX plugin_mutex = HEIMDAL_MUTEX_INITIALIZER;
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static struct plugin *registered = NULL;
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static int plugins_needs_scan = 1;
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static const char *sysplugin_dirs[] = {
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LIBDIR "/plugin/krb5",
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#ifdef __APPLE__
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"/System/Library/KerberosPlugins/KerberosFrameworkPlugins",
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#endif
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NULL
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};
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/*
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*
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*/
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void *
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_krb5_plugin_get_symbol(struct krb5_plugin *p)
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{
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return p->symbol;
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}
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struct krb5_plugin *
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_krb5_plugin_get_next(struct krb5_plugin *p)
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{
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return p->next;
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}
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/*
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*
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*/
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#ifdef HAVE_DLOPEN
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static krb5_error_code
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loadlib(krb5_context context, char *path)
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{
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struct plugin *e;
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e = calloc(1, sizeof(*e));
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if (e == NULL) {
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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free(path);
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return ENOMEM;
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}
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#ifndef RTLD_LAZY
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#define RTLD_LAZY 0
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#endif
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#ifndef RTLD_LOCAL
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#define RTLD_LOCAL 0
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#endif
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e->type = DSO;
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/* ignore error from dlopen, and just keep it as negative cache entry */
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e->u.dso.dsohandle = dlopen(path, RTLD_LOCAL|RTLD_LAZY);
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e->u.dso.path = path;
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e->next = registered;
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registered = e;
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return 0;
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}
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#endif /* HAVE_DLOPEN */
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/**
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* Register a plugin symbol name of specific type.
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* @param context a Keberos context
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* @param type type of plugin symbol
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* @param name name of plugin symbol
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* @param symbol a pointer to the named symbol
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* @return In case of error a non zero error com_err error is returned
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* and the Kerberos error string is set.
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*
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* @ingroup krb5_support
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*/
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_plugin_register(krb5_context context,
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enum krb5_plugin_type type,
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const char *name,
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void *symbol)
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{
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struct plugin *e;
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HEIMDAL_MUTEX_lock(&plugin_mutex);
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/* check for duplicates */
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for (e = registered; e != NULL; e = e->next) {
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if (e->type == SYMBOL &&
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strcmp(e->u.symbol.name, name) == 0 &&
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e->u.symbol.type == type && e->u.symbol.symbol == symbol) {
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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return 0;
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}
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}
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e = calloc(1, sizeof(*e));
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if (e == NULL) {
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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e->type = SYMBOL;
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e->u.symbol.type = type;
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e->u.symbol.name = strdup(name);
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if (e->u.symbol.name == NULL) {
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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free(e);
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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e->u.symbol.symbol = symbol;
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e->next = registered;
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registered = e;
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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return 0;
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}
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static int
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is_valid_plugin_filename(const char * n)
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{
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if (n[0] == '.' && (n[1] == '\0' || (n[1] == '.' && n[2] == '\0')))
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return 0;
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#ifdef _WIN32
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/* On Windows, we only attempt to load .dll files as plug-ins. */
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{
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const char * ext;
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ext = strrchr(n, '.');
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if (ext == NULL)
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return 0;
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return !stricmp(ext, ".dll");
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}
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#else
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return 1;
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#endif
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}
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static void
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trim_trailing_slash(char * path)
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{
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size_t l;
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l = strlen(path);
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while (l > 0 && (path[l - 1] == '/'
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#ifdef BACKSLASH_PATH_DELIM
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|| path[l - 1] == '\\'
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#endif
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)) {
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path[--l] = '\0';
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}
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}
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static krb5_error_code
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load_plugins(krb5_context context)
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{
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struct plugin *e;
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krb5_error_code ret;
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char **dirs = NULL, **di;
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struct dirent *entry;
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char *path;
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DIR *d = NULL;
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if (!plugins_needs_scan)
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return 0;
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plugins_needs_scan = 0;
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#ifdef HAVE_DLOPEN
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dirs = krb5_config_get_strings(context, NULL, "libdefaults",
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"plugin_dir", NULL);
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if (dirs == NULL)
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dirs = rk_UNCONST(sysplugin_dirs);
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for (di = dirs; *di != NULL; di++) {
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char * dir = *di;
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#ifdef KRB5_USE_PATH_TOKENS
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if (_krb5_expand_path_tokens(context, *di, &dir))
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goto next_dir;
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#endif
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trim_trailing_slash(dir);
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d = opendir(dir);
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if (d == NULL)
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goto next_dir;
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rk_cloexec_dir(d);
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while ((entry = readdir(d)) != NULL) {
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char *n = entry->d_name;
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/* skip . and .. */
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if (!is_valid_plugin_filename(n))
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continue;
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path = NULL;
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ret = 0;
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#ifdef __APPLE__
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{ /* support loading bundles on MacOS */
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size_t len = strlen(n);
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if (len > 7 && strcmp(&n[len - 7], ".bundle") == 0)
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ret = asprintf(&path, "%s/%s/Contents/MacOS/%.*s", dir, n, (int)(len - 7), n);
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}
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#endif
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if (ret < 0 || path == NULL)
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ret = asprintf(&path, "%s/%s", dir, n);
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if (ret < 0 || path == NULL) {
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ret = ENOMEM;
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krb5_set_error_message(context, ret, "malloc: out of memory");
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return ret;
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}
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/* check if already tried */
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for (e = registered; e != NULL; e = e->next)
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if (e->type == DSO && strcmp(e->u.dso.path, path) == 0)
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break;
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if (e) {
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free(path);
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} else {
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loadlib(context, path); /* store or frees path */
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}
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}
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closedir(d);
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next_dir:
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if (dir != *di)
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free(dir);
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}
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if (dirs != rk_UNCONST(sysplugin_dirs))
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krb5_config_free_strings(dirs);
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#endif /* HAVE_DLOPEN */
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return 0;
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}
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static krb5_error_code
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add_symbol(krb5_context context, struct krb5_plugin **list, void *symbol)
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{
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struct krb5_plugin *e;
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e = calloc(1, sizeof(*e));
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if (e == NULL) {
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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e->symbol = symbol;
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e->next = *list;
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*list = e;
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return 0;
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}
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krb5_error_code
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_krb5_plugin_find(krb5_context context,
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enum krb5_plugin_type type,
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const char *name,
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struct krb5_plugin **list)
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{
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struct plugin *e;
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krb5_error_code ret;
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*list = NULL;
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HEIMDAL_MUTEX_lock(&plugin_mutex);
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load_plugins(context);
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for (ret = 0, e = registered; e != NULL; e = e->next) {
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switch(e->type) {
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case DSO: {
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void *sym;
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if (e->u.dso.dsohandle == NULL)
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continue;
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sym = dlsym(e->u.dso.dsohandle, name);
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if (sym)
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ret = add_symbol(context, list, sym);
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break;
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}
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case SYMBOL:
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if (strcmp(e->u.symbol.name, name) == 0 && e->u.symbol.type == type)
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ret = add_symbol(context, list, e->u.symbol.symbol);
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break;
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}
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if (ret) {
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_krb5_plugin_free(*list);
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*list = NULL;
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}
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}
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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if (ret)
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return ret;
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if (*list == NULL) {
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krb5_set_error_message(context, ENOENT, "Did not find a plugin for %s", name);
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return ENOENT;
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}
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return 0;
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}
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void
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_krb5_plugin_free(struct krb5_plugin *list)
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{
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struct krb5_plugin *next;
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while (list) {
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next = list->next;
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free(list);
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list = next;
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}
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}
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/*
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* module - dict of {
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* ModuleName = [
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* plugin = object{
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* array = { ptr, ctx }
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* }
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* ]
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* }
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*/
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static heim_dict_t modules;
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struct plugin2 {
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heim_string_t path;
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void *dsohandle;
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heim_dict_t names;
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};
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static void
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plug_dealloc(void *ptr)
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{
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struct plugin2 *p = ptr;
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heim_release(p->path);
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heim_release(p->names);
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if (p->dsohandle)
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dlclose(p->dsohandle);
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}
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void
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_krb5_load_plugins(krb5_context context, const char *name, const char **paths)
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{
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#ifdef HAVE_DLOPEN
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heim_string_t s = heim_string_create(name);
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heim_dict_t module;
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struct dirent *entry;
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krb5_error_code ret;
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const char **di;
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DIR *d;
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HEIMDAL_MUTEX_lock(&plugin_mutex);
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if (modules == NULL) {
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modules = heim_dict_create(11);
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if (modules == NULL) {
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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return;
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}
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}
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module = heim_dict_copy_value(modules, s);
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if (module == NULL) {
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module = heim_dict_create(11);
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if (module == NULL) {
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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heim_release(s);
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return;
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}
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heim_dict_add_value(modules, s, module);
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}
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heim_release(s);
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for (di = paths; *di != NULL; di++) {
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d = opendir(*di);
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if (d == NULL)
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continue;
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rk_cloexec_dir(d);
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while ((entry = readdir(d)) != NULL) {
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char *n = entry->d_name;
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char *path = NULL;
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heim_string_t spath;
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struct plugin2 *p;
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/* skip . and .. */
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if (n[0] == '.' && (n[1] == '\0' || (n[1] == '.' && n[2] == '\0')))
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continue;
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ret = 0;
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#ifdef __APPLE__
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{ /* support loading bundles on MacOS */
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size_t len = strlen(n);
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if (len > 7 && strcmp(&n[len - 7], ".bundle") == 0)
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ret = asprintf(&path, "%s/%s/Contents/MacOS/%.*s", *di, n, (int)(len - 7), n);
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}
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#endif
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if (ret < 0 || path == NULL)
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ret = asprintf(&path, "%s/%s", *di, n);
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|
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if (ret < 0 || path == NULL)
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continue;
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spath = heim_string_create(n);
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if (spath == NULL) {
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free(path);
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continue;
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}
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/* check if already cached */
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p = heim_dict_copy_value(module, spath);
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if (p == NULL) {
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p = heim_alloc(sizeof(*p), "krb5-plugin", plug_dealloc);
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if (p)
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p->dsohandle = dlopen(path, RTLD_LOCAL|RTLD_LAZY);
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if (p->dsohandle) {
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p->path = heim_retain(spath);
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p->names = heim_dict_create(11);
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heim_dict_add_value(module, spath, p);
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}
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}
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heim_release(spath);
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heim_release(p);
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free(path);
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}
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closedir(d);
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}
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heim_release(module);
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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#endif /* HAVE_DLOPEN */
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}
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|
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void
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_krb5_unload_plugins(krb5_context context, const char *name)
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{
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HEIMDAL_MUTEX_lock(&plugin_mutex);
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heim_release(modules);
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modules = NULL;
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HEIMDAL_MUTEX_unlock(&plugin_mutex);
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}
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|
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/*
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*
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*/
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struct common_plugin_method {
|
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int version;
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krb5_error_code (*init)(krb5_context, void **);
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void (*fini)(void *);
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};
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|
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struct plug {
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|
void *dataptr;
|
|
void *ctx;
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|
};
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|
|
static void
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|
plug_free(void *ptr)
|
|
{
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|
struct plug *pl = ptr;
|
|
if (pl->dataptr) {
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|
struct common_plugin_method *cpm = pl->dataptr;
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cpm->fini(pl->ctx);
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}
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}
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|
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struct iter_ctx {
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krb5_context context;
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|
heim_string_t n;
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const char *name;
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int min_version;
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heim_array_t result;
|
|
krb5_error_code (*func)(krb5_context, const void *, void *, void *);
|
|
void *userctx;
|
|
krb5_error_code ret;
|
|
};
|
|
|
|
static void
|
|
search_modules(void *ctx, heim_object_t key, heim_object_t value)
|
|
{
|
|
struct iter_ctx *s = ctx;
|
|
struct plugin2 *p = value;
|
|
struct plug *pl = heim_dict_copy_value(p->names, s->n);
|
|
struct common_plugin_method *cpm;
|
|
|
|
if (pl == NULL) {
|
|
if (p->dsohandle == NULL)
|
|
return;
|
|
|
|
pl = heim_alloc(sizeof(*pl), "struct-plug", plug_free);
|
|
|
|
cpm = pl->dataptr = dlsym(p->dsohandle, s->name);
|
|
if (cpm) {
|
|
int ret;
|
|
|
|
ret = cpm->init(s->context, &pl->ctx);
|
|
if (ret)
|
|
cpm = pl->dataptr = NULL;
|
|
}
|
|
heim_dict_add_value(p->names, s->n, pl);
|
|
} else {
|
|
cpm = pl->dataptr;
|
|
}
|
|
|
|
if (cpm && cpm->version >= s->min_version)
|
|
heim_array_append_value(s->result, pl);
|
|
|
|
heim_release(pl);
|
|
}
|
|
|
|
static void
|
|
eval_results(heim_object_t value, void *ctx)
|
|
{
|
|
struct plug *pl = value;
|
|
struct iter_ctx *s = ctx;
|
|
|
|
if (s->ret != KRB5_PLUGIN_NO_HANDLE)
|
|
return;
|
|
|
|
s->ret = s->func(s->context, pl->dataptr, pl->ctx, s->userctx);
|
|
}
|
|
|
|
krb5_error_code
|
|
_krb5_plugin_run_f(krb5_context context,
|
|
const char *module,
|
|
const char *name,
|
|
int min_version,
|
|
int flags,
|
|
void *userctx,
|
|
krb5_error_code (*func)(krb5_context, const void *, void *, void *))
|
|
{
|
|
heim_string_t m = heim_string_create(module);
|
|
heim_dict_t dict;
|
|
struct iter_ctx s;
|
|
|
|
HEIMDAL_MUTEX_lock(&plugin_mutex);
|
|
|
|
dict = heim_dict_copy_value(modules, m);
|
|
heim_release(m);
|
|
if (dict == NULL) {
|
|
HEIMDAL_MUTEX_unlock(&plugin_mutex);
|
|
return KRB5_PLUGIN_NO_HANDLE;
|
|
}
|
|
|
|
s.context = context;
|
|
s.name = name;
|
|
s.n = heim_string_create(name);
|
|
s.min_version = min_version;
|
|
s.result = heim_array_create();
|
|
s.func = func;
|
|
s.userctx = userctx;
|
|
|
|
heim_dict_iterate_f(dict, search_modules, &s);
|
|
|
|
heim_release(dict);
|
|
|
|
HEIMDAL_MUTEX_unlock(&plugin_mutex);
|
|
|
|
s.ret = KRB5_PLUGIN_NO_HANDLE;
|
|
|
|
heim_array_iterate_f(s.result, eval_results, &s);
|
|
|
|
heim_release(s.result);
|
|
heim_release(s.n);
|
|
|
|
return s.ret;
|
|
}
|