307 lines
12 KiB
Diff
307 lines
12 KiB
Diff
Adjusted for 1.12, which still had vtbl, locate_fptrs, and (vestigial)
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profile_in_memory fields, and drop the hunk that touched .gitignore.
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commit c452644d91d57d8b05ef396a029e34d0c7a48920
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Author: Greg Hudson <ghudson@mit.edu>
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Date: Wed Dec 18 15:03:03 2013 -0500
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Fix krb5_copy_context
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krb5_copy_context has been broken since 1.8 (it broke in r22456)
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because k5_copy_etypes crashes on null enctype lists. Subsequent
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additions to the context structure were not reflected in
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krb5_copy_context, creating double-free bugs. Make k5_copy_etypes
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handle null input and account for all new fields in krb5_copy_context.
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Reported by Arran Cudbard-Bell.
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ticket: 7807 (new)
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target_version: 1.12.1
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tags: pullup
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diff --git a/src/lib/krb5/krb/copy_ctx.c b/src/lib/krb5/krb/copy_ctx.c
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index 0bc92f8..4237023 100644
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--- a/src/lib/krb5/krb/copy_ctx.c
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+++ b/src/lib/krb5/krb/copy_ctx.c
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@@ -77,13 +77,26 @@ krb5_copy_context(krb5_context ctx, krb5_context *nctx_out)
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nctx->ser_ctx_count = 0;
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nctx->ser_ctx = NULL;
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nctx->prompt_types = NULL;
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+ nctx->preauth_context = NULL;
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+ nctx->ccselect_handles = NULL;
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+ nctx->localauth_handles = NULL;
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+ nctx->hostrealm_handles = NULL;
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+ nctx->kdblog_context = NULL;
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+ nctx->trace_callback = NULL;
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+ nctx->trace_callback_data = NULL;
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+ nctx->plugin_base_dir = NULL;
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nctx->os_context.default_ccname = NULL;
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+#ifdef KRB5_DNS_LOOKUP
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+ nctx->profile_in_memory = 0;
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+#endif /* KRB5_DNS_LOOKUP */
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+
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memset(&nctx->libkrb5_plugins, 0, sizeof(nctx->libkrb5_plugins));
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nctx->vtbl = NULL;
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nctx->locate_fptrs = NULL;
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memset(&nctx->err, 0, sizeof(nctx->err));
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+ memset(&nctx->plugins, 0, sizeof(nctx->plugins));
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ret = k5_copy_etypes(ctx->in_tkt_etypes, &nctx->in_tkt_etypes);
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if (ret)
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@@ -101,6 +109,11 @@ krb5_copy_context(krb5_context ctx, krb5_context *nctx_out)
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ret = krb5_get_profile(ctx, &nctx->profile);
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if (ret)
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goto errout;
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+ nctx->plugin_base_dir = strdup(ctx->plugin_base_dir);
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+ if (nctx->plugin_base_dir == NULL) {
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+ ret = ENOMEM;
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+ goto errout;
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+ }
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errout:
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if (ret) {
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diff --git a/src/lib/krb5/krb/etype_list.c b/src/lib/krb5/krb/etype_list.c
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index 9efe2e0..71f664f 100644
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--- a/src/lib/krb5/krb/etype_list.c
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+++ b/src/lib/krb5/krb/etype_list.c
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@@ -49,6 +49,8 @@ k5_copy_etypes(const krb5_enctype *old_list, krb5_enctype **new_list)
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krb5_enctype *list;
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*new_list = NULL;
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+ if (old_list == NULL)
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+ return 0;
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count = k5_count_etypes(old_list);
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list = malloc(sizeof(krb5_enctype) * (count + 1));
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if (list == NULL)
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commit b78c3c8c5025aec870d20472f80d4a652062f921
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Author: Greg Hudson <ghudson@mit.edu>
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Date: Wed Dec 18 13:08:25 2013 -0500
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Add a test program for krb5_copy_context
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This test program isn't completely proof against the kind of mistakes
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we've made with krb5_copy_context in the past, but it at least
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exercises krb5_copy_context and can detect some kinds of bugs.
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ticket: 7807
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diff --git a/src/lib/krb5/krb/Makefile.in b/src/lib/krb5/krb/Makefile.in
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index 7d1682d..3b58219 100644
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--- a/src/lib/krb5/krb/Makefile.in
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+++ b/src/lib/krb5/krb/Makefile.in
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@@ -349,6 +349,7 @@ SRCS= $(srcdir)/addr_comp.c \
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$(srcdir)/t_expire_warn.c \
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$(srcdir)/t_authdata.c \
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$(srcdir)/t_cc_config.c \
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+ $(srcdir)/t_copy_context.c \
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$(srcdir)/t_in_ccache.c \
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$(srcdir)/t_response_items.c \
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$(srcdir)/t_vfy_increds.c
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@@ -429,11 +430,14 @@ t_in_ccache: t_in_ccache.o $(KRB5_BASE_DEPLIBS)
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t_cc_config: t_cc_config.o $(KRB5_BASE_DEPLIBS)
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$(CC_LINK) -o $@ t_cc_config.o $(KRB5_BASE_LIBS)
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+t_copy_context: t_copy_context.o $(KRB5_BASE_DEPLIBS)
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+ $(CC_LINK) -o $@ t_copy_context.o $(KRB5_BASE_LIBS)
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+
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t_response_items: t_response_items.o response_items.o $(KRB5_BASE_DEPLIBS)
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$(CC_LINK) -o $@ t_response_items.o response_items.o $(KRB5_BASE_LIBS)
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TEST_PROGS= t_walk_rtree t_kerb t_ser t_deltat t_expand t_authdata t_pac \
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- t_in_ccache t_cc_config \
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+ t_in_ccache t_cc_config t_copy_context \
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t_princ t_etypes t_vfy_increds t_response_items
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check-unix:: $(TEST_PROGS)
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@@ -473,6 +477,8 @@ check-unix:: $(TEST_PROGS)
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$(RUN_SETUP) $(VALGRIND) ./t_princ
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$(RUN_SETUP) $(VALGRIND) ./t_etypes
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$(RUN_SETUP) $(VALGRIND) ./t_response_items
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+ KRB5_CONFIG=$(srcdir)/t_krb5.conf ; export KRB5_CONFIG ;\
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+ $(RUN_SETUP) $(VALGRIND) ./t_copy_context
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check-pytests:: t_expire_warn t_vfy_increds
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$(RUNPYTEST) $(srcdir)/t_expire_warn.py $(PYTESTFLAGS)
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@@ -491,6 +497,7 @@ clean::
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$(OUTPRE)t_princ$(EXEEXT) $(OUTPRE)t_princ.$(OBJEXT) \
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$(OUTPRE)t_authdata$(EXEEXT) $(OUTPRE)t_authdata.$(OBJEXT) \
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$(OUTPRE)t_cc_config$(EXEEXT) $(OUTPRE)t_cc_config.$(OBJEXT) \
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+ $(OUTPRE)t_copy_context(EXEEXT) $(OUTPRE)t_copy_context.$(OBJEXT) \
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$(OUTPRE)t_in_ccache$(EXEEXT) $(OUTPRE)t_in_ccache.$(OBJEXT) \
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$(OUTPRE)t_ad_fx_armor$(EXEEXT) $(OUTPRE)t_ad_fx_armor.$(OBJEXT) \
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$(OUTPRE)t_vfy_increds$(EXEEXT) $(OUTPRE)t_vfy_increds.$(OBJEXT) \
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diff --git a/src/lib/krb5/krb/t_copy_context.c b/src/lib/krb5/krb/t_copy_context.c
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new file mode 100644
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index 0000000..522fa0c
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--- /dev/null
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+++ b/src/lib/krb5/krb/t_copy_context.c
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@@ -0,0 +1,166 @@
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+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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+/* lib/krb5/krb/t_copy_context.C - Test program for krb5_copy_context */
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+/*
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+ * Copyright (C) 2013 by the Massachusetts Institute of Technology.
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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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+ * * 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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+ * * Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in
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+ * the documentation and/or other materials provided with the
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+ * distribution.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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+ * 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,
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+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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+ * OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#include <k5-int.h>
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+
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+static void
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+trace(krb5_context ctx, const krb5_trace_info *info, void *data)
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+{
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+}
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+
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+static void
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+check(int cond)
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+{
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+ if (!cond)
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+ abort();
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+}
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+
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+static void
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+compare_string(const char *str1, const char *str2)
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+{
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+ check((str1 == NULL) == (str2 == NULL));
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+ if (str1 != NULL)
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+ check(strcmp(str1, str2) == 0);
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+}
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+
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+static void
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+compare_etypes(krb5_enctype *list1, krb5_enctype *list2)
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+{
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+ check((list1 == NULL) == (list2 == NULL));
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+ if (list1 == NULL)
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+ return;
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+ while (*list1 != ENCTYPE_NULL && *list1 == *list2)
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+ list1++, list2++;
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+ check(*list1 == *list2);
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+}
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+
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+/* Check that the context c is a valid copy of the reference context r. */
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+static void
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+check_context(krb5_context c, krb5_context r)
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+{
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+ int i;
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+
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+ /* Check fields which should have been propagated from r. */
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+ compare_etypes(c->in_tkt_etypes, r->in_tkt_etypes);
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+ compare_etypes(c->tgs_etypes, r->tgs_etypes);
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+ check(c->os_context.time_offset == r->os_context.time_offset);
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+ check(c->os_context.usec_offset == r->os_context.usec_offset);
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+ check(c->os_context.os_flags == r->os_context.os_flags);
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+ compare_string(c->os_context.default_ccname, r->os_context.default_ccname);
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+ check(c->clockskew == r->clockskew);
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+ check(c->kdc_req_sumtype == r->kdc_req_sumtype);
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+ check(c->default_ap_req_sumtype == r->default_ap_req_sumtype);
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+ check(c->default_safe_sumtype == r->default_safe_sumtype);
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+ check(c->kdc_default_options == r->kdc_default_options);
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+ check(c->library_options == r->library_options);
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+ check(c->profile_secure == r->profile_secure);
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+ check(c->fcc_default_format == r->fcc_default_format);
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+ check(c->udp_pref_limit == r->udp_pref_limit);
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+ check(c->use_conf_ktypes == r->use_conf_ktypes);
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+ check(c->allow_weak_crypto == r->allow_weak_crypto);
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+ check(c->ignore_acceptor_hostname == r->ignore_acceptor_hostname);
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+ check(c->dns_canonicalize_hostname == r->dns_canonicalize_hostname);
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+ compare_string(c->plugin_base_dir, r->plugin_base_dir);
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+
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+ /* Check fields which don't propagate. */
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+ check(c->dal_handle == NULL);
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+ check(c->ser_ctx_count == 0);
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+ check(c->ser_ctx == NULL);
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+ check(c->prompt_types == NULL);
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+ check(c->libkrb5_plugins.files == NULL);
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+ check(c->preauth_context == NULL);
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+ check(c->ccselect_handles == NULL);
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+ check(c->localauth_handles == NULL);
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+ check(c->hostrealm_handles == NULL);
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+ check(c->err.code == 0);
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+ check(c->err.msg == NULL);
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+ check(c->kdblog_context == NULL);
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+ check(c->trace_callback == NULL);
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+ check(c->trace_callback_data == NULL);
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+ for (i = 0; i < PLUGIN_NUM_INTERFACES; i++) {
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+ check(c->plugins[i].modules == NULL);
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+ check(!c->plugins[i].configured);
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+ }
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+}
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+
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+int
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+main(int argc, char **argv)
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+{
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+ krb5_context ctx, ctx2;
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+ krb5_plugin_initvt_fn *mods;
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+ const krb5_enctype etypes1[] = { ENCTYPE_DES3_CBC_SHA1, 0 };
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+ const krb5_enctype etypes2[] = { ENCTYPE_AES128_CTS_HMAC_SHA1_96,
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+ ENCTYPE_AES256_CTS_HMAC_SHA1_96, 0 };
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+ krb5_prompt_type ptypes[] = { KRB5_PROMPT_TYPE_PASSWORD };
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+
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+ /* Copy a default context and verify the result. */
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+ check(krb5_init_context(&ctx) == 0);
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+ check(krb5_copy_context(ctx, &ctx2) == 0);
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+ check_context(ctx2, ctx);
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+ krb5_free_context(ctx2);
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+
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+ /* Set non-default values for all of the propagated fields in ctx. */
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+ ctx->allow_weak_crypto = TRUE;
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+ check(krb5_set_default_in_tkt_ktypes(ctx, etypes1) == 0);
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+ check(krb5_set_default_tgs_enctypes(ctx, etypes2) == 0);
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+ check(krb5_set_debugging_time(ctx, 1234, 5678) == 0);
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+ check(krb5_cc_set_default_name(ctx, "defccname") == 0);
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+ check(krb5_set_default_realm(ctx, "defrealm") == 0);
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+ ctx->clockskew = 18;
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+ ctx->kdc_req_sumtype = CKSUMTYPE_NIST_SHA;
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+ ctx->default_ap_req_sumtype = CKSUMTYPE_HMAC_SHA1_96_AES128;
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+ ctx->default_safe_sumtype = CKSUMTYPE_HMAC_SHA1_96_AES256;
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+ ctx->kdc_default_options = KDC_OPT_FORWARDABLE;
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+ ctx->library_options = 0;
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+ ctx->profile_secure = TRUE;
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+ ctx->udp_pref_limit = 2345;
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+ ctx->use_conf_ktypes = TRUE;
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+ ctx->ignore_acceptor_hostname = TRUE;
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+ ctx->dns_canonicalize_hostname = FALSE;
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+ free(ctx->plugin_base_dir);
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+ check((ctx->plugin_base_dir = strdup("/a/b/c/d")) != NULL);
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+
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+ /* Also set some of the non-propagated fields. */
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+ ctx->prompt_types = ptypes;
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+ check(k5_plugin_load_all(ctx, PLUGIN_INTERFACE_PWQUAL, &mods) == 0);
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+ k5_plugin_free_modules(ctx, mods);
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+ krb5_set_error_message(ctx, ENOMEM, "nooooooooo");
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+ krb5_set_trace_callback(ctx, trace, ctx);
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+
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+ /* Copy the intentionally messy context and verify the result. */
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+ check(krb5_copy_context(ctx, &ctx2) == 0);
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+ check_context(ctx2, ctx);
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+ krb5_free_context(ctx2);
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+
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+ krb5_free_context(ctx);
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+ return 0;
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+}
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