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trace: don't pretend success if it's not enabled 

Partially reverts d33d76168f Don't fail when tracing is disabled

Commit d33d76168f fixed the problem that the initialization of
libcrypto failed when tracing was disabled, because the unoperational
ossl_trace_init() function returned a failure code. The problem was
fixed by changing its return value from failure to success.

As part of the fix the return values of other unimplemented trace API
functions (like OSSL_trace_set_channel(),OSSL_trace_set_callback())
was changed from failure to success, too. This change was not necessary
and is a bit problematic IMHO, because nobody expects an unimplemented
function to pretend it succeeded.

It's the application's duty to handle the case correctly when the trace
API is not enabled (i.e., OPENSSL_NO_TRACE is defined), not the API's job
to pretend success just to prevent the application from failing.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/8552)
This commit is contained in:
Dr. Matthias St. Pierre 2019-03-19 08:53:35 +01:00
parent 2e6b615f79
commit 0fda9f7c29
2 changed files with 17 additions and 20 deletions
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5
apps/openssl.c
View File

@ -118,6 +118,8 @@ static char *make_config_name(void)
return p;
}
#ifndef OPENSSL_NO_TRACE
typedef struct tracedata_st {
BIO *bio;
unsigned int ingroup:1;
@ -224,6 +226,7 @@ static void setup_trace(const char *str)
OPENSSL_free(val);
atexit(cleanup_trace);
}
#endif /* OPENSSL_NO_TRACE */
int main(int argc, char *argv[])
{
@ -260,7 +263,9 @@ int main(int argc, char *argv[])
*/
atexit(destroy_prefix_method);
#ifndef OPENSSL_NO_TRACE
setup_trace(getenv("OPENSSL_TRACE"));
#endif
p = getenv("OPENSSL_DEBUG_MEMORY");
if (p != NULL && strcmp(p, "on") == 0)

32
crypto/trace.c
View File

@ -328,12 +328,11 @@ void ossl_trace_cleanup(void)
int OSSL_trace_set_channel(int category, BIO *channel)
{
#ifndef OPENSSL_NO_TRACE
if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM
|| !set_trace_data(category, SIMPLE_CHANNEL, &channel, NULL, NULL,
trace_attach_cb, trace_detach_cb))
return 0;
if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
return set_trace_data(category, SIMPLE_CHANNEL, &channel, NULL, NULL,
trace_attach_cb, trace_detach_cb))
#endif
return 1;
return 0;
}
#ifndef OPENSSL_NO_TRACE
@ -367,7 +366,7 @@ int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data)
struct trace_data_st *trace_data = NULL;
if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
goto err;
return 0;
if (callback != NULL) {
if ((channel = BIO_new(&trace_method)) == NULL
@ -386,41 +385,34 @@ int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data)
trace_attach_w_callback_cb, trace_detach_cb))
goto err;
goto done;
return 1;
err:
BIO_free(channel);
OPENSSL_free(trace_data);
return 0;
done:
#endif
return 1;
return 0;
}
int OSSL_trace_set_prefix(int category, const char *prefix)
{
int rv = 1;
#ifndef OPENSSL_NO_TRACE
if (category >= 0 || category < OSSL_TRACE_CATEGORY_NUM)
if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
return set_trace_data(category, 0, NULL, &prefix, NULL,
trace_attach_cb, trace_detach_cb);
rv = 0;
#endif
return rv;
return 0;
}
int OSSL_trace_set_suffix(int category, const char *suffix)
{
int rv = 1;
#ifndef OPENSSL_NO_TRACE
if (category >= 0 || category < OSSL_TRACE_CATEGORY_NUM)
if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
return set_trace_data(category, 0, NULL, NULL, &suffix,
trace_attach_cb, trace_detach_cb);
rv = 0;
#endif
return rv;
return 0;
}
#ifndef OPENSSL_NO_TRACE