Ensure all BIO functions call the new style callback

Reviewed-by: Richard Levitte <levitte@openssl.org>
This commit is contained in:
Matt Caswell 2016-10-20 13:48:31 +01:00
parent 3befffa39d
commit 98e553d2ce
2 changed files with 155 additions and 113 deletions

View File

@ -13,6 +13,65 @@
#include "bio_lcl.h"
#include "internal/cryptlib.h"
/*
* Helper macro for the callback to determine whether an operator expects a
* len parameter or not
*/
#define HAS_LEN_OPER(o) ((o) == BIO_CB_READ || (o) == BIO_CB_WRITE || \
(o) == BIO_CB_GETS)
/*
* Helper function to work out whether to call the new style callback or the old
* one, and translate between the two.
*
* This has a long return type for consistency with the old callback. Similarly
* for the "long" used for "inret"
*/
static long bio_call_callback(BIO *b, int oper, const char *argp, size_t len,
int argi, long argl, long inret, size_t *processed)
{
long ret;
int bareoper;
if (b->callback_ex != NULL) {
return b->callback_ex(b, oper, argp, len, argi, argl, inret, processed);
}
/* Strip off any BIO_CB_RETURN flag */
bareoper = oper & ~BIO_CB_RETURN;
/*
* We have an old style callback, so we will have to do nasty casts and
* check for overflows.
*/
if (HAS_LEN_OPER(bareoper)) {
/* In this case |len| is set, and should be used instead of |argi| */
if (len > INT_MAX)
return -1;
argi = (int)len;
if (inret && (oper & BIO_CB_RETURN)) {
if (*processed > INT_MAX)
return -1;
inret = *processed;
}
}
ret = b->callback(b, oper, argp, argi, argl, inret);
if (ret > LONG_MAX || ret < LONG_MIN)
return -1;
if (ret >= 0 && (HAS_LEN_OPER(bareoper) || bareoper == BIO_CB_PUTS)) {
*processed = (size_t)ret;
ret = 1;
}
return ret;
}
BIO *BIO_new(const BIO_METHOD *method)
{
BIO *bio = OPENSSL_zalloc(sizeof(*bio));
@ -52,21 +111,24 @@ err:
int BIO_free(BIO *a)
{
int i;
int ret;
if (a == NULL)
return 0;
if (CRYPTO_atomic_add(&a->references, -1, &i, a->lock) <= 0)
if (CRYPTO_atomic_add(&a->references, -1, &ret, a->lock) <= 0)
return 0;
REF_PRINT_COUNT("BIO", a);
if (i > 0)
if (ret > 0)
return 1;
REF_ASSERT_ISNT(i < 0);
if ((a->callback != NULL) &&
((i = (int)a->callback(a, BIO_CB_FREE, NULL, 0, 0L, 1L)) <= 0))
return i;
REF_ASSERT_ISNT(ret < 0);
if (a->callback != NULL || a->callback_ex != NULL) {
ret = (int)bio_call_callback(a, BIO_CB_FREE, NULL, 0, 0, 0L, 1L, NULL);
if (ret <= 0)
return ret;
}
if ((a->method != NULL) && (a->method->destroy != NULL))
a->method->destroy(a);
@ -182,57 +244,6 @@ int BIO_method_type(const BIO *b)
return b->method->type;
}
static int bio_call_callback(BIO *b, int oper, const char *argp, size_t len,
int argi, long argl, int inret, size_t *processed,
long *lret)
{
long ret;
int bareoper;
if (b->callback_ex != NULL) {
return b->callback_ex(b, oper, argp, len, argi, argl, inret, processed,
lret);
}
/* Strip off the BIO_CB_RETURN flag */
bareoper = oper & ~BIO_CB_RETURN;
/*
* We have an old style callback, so we will have to do nasty casts and
* check for overflows.
*/
if (bareoper == BIO_CB_READ || bareoper == BIO_CB_WRITE
|| bareoper == BIO_CB_GETS) {
/* In this case |len| is set, and should be used instead of |argi| */
if (len > INT_MAX)
return 0;
argi = (int)len;
if (inret && (oper & BIO_CB_RETURN)) {
if (*processed > INT_MAX)
return 0;
inret = *processed;
}
}
ret = b->callback(b, oper, argp, argi, argl, inret);
if (bareoper == BIO_CB_CTRL)
return 1;
if (ret > INT_MAX || ret < INT_MIN)
return 0;
if (lret != NULL)
*lret = ret;
if (ret >= 0) {
*processed = (size_t)ret;
ret = 1;
}
return (int)ret;
}
int BIO_read(BIO *b, void *out, int outl)
{
size_t read;
@ -261,8 +272,8 @@ int BIO_read_ex(BIO *b, void *out, size_t outl, size_t *read)
}
if ((b->callback != NULL || b->callback_ex != NULL) &&
((ret = bio_call_callback(b, BIO_CB_READ, out, outl, 0, 0L, 1L, read,
NULL)) <= 0))
((ret = (int)bio_call_callback(b, BIO_CB_READ, out, outl, 0, 0L, 1L,
read)) <= 0))
return ret;
if (!b->init) {
@ -276,8 +287,8 @@ int BIO_read_ex(BIO *b, void *out, size_t outl, size_t *read)
b->num_read += (uint64_t)*read;
if (b->callback != NULL || b->callback_ex != NULL)
ret = bio_call_callback(b, BIO_CB_READ | BIO_CB_RETURN, out, outl, 0,
0L, ret, read, NULL);
ret = (int)bio_call_callback(b, BIO_CB_READ | BIO_CB_RETURN, out, outl,
0, 0L, ret, read);
return ret;
}
@ -313,8 +324,8 @@ int BIO_write_ex(BIO *b, const void *in, size_t inl, size_t *written)
}
if ((b->callback != NULL || b->callback_ex != NULL) &&
((ret = bio_call_callback(b, BIO_CB_WRITE, in, inl, 0, 0L, 1L, written,
NULL)) <= 0))
((ret = (int)bio_call_callback(b, BIO_CB_WRITE, in, inl, 0, 0L, 1L,
written)) <= 0))
return ret;
if (!b->init) {
@ -328,67 +339,95 @@ int BIO_write_ex(BIO *b, const void *in, size_t inl, size_t *written)
b->num_write += (uint64_t)*written;
if (b->callback != NULL || b->callback_ex != NULL)
ret = bio_call_callback(b, BIO_CB_WRITE | BIO_CB_RETURN, in, inl, 0,
0L, ret, written, NULL);
ret = (int)bio_call_callback(b, BIO_CB_WRITE | BIO_CB_RETURN, in, inl,
0, 0L, ret, written);
return ret;
}
int BIO_puts(BIO *b, const char *in)
{
int i;
long (*cb) (BIO *, int, const char *, int, long, long);
int ret;
size_t written;
if ((b == NULL) || (b->method == NULL) || (b->method->bputs == NULL)) {
BIOerr(BIO_F_BIO_PUTS, BIO_R_UNSUPPORTED_METHOD);
return (-2);
return -2;
}
cb = b->callback;
if ((cb != NULL) && ((i = (int)cb(b, BIO_CB_PUTS, in, 0, 0L, 1L)) <= 0))
return (i);
if (b->callback != NULL || b->callback_ex != NULL) {
ret = (int)bio_call_callback(b, BIO_CB_PUTS, in, 0, 0, 0L, 1L, NULL);
if (ret <= 0)
return ret;
}
if (!b->init) {
BIOerr(BIO_F_BIO_PUTS, BIO_R_UNINITIALIZED);
return (-2);
return -2;
}
i = b->method->bputs(b, in);
ret = b->method->bputs(b, in);
if (i > 0)
b->num_write += (uint64_t)i;
if (ret > 0) {
b->num_write += (uint64_t)ret;
written = ret;
ret = 1;
}
if (cb != NULL)
i = (int)cb(b, BIO_CB_PUTS | BIO_CB_RETURN, in, 0, 0L, (long)i);
return (i);
if (b->callback != NULL || b->callback_ex != NULL)
ret = (int)bio_call_callback(b, BIO_CB_PUTS | BIO_CB_RETURN, in, 0, 0,
0L, ret, &written);
if (ret > 0) {
if (written > INT_MAX)
ret = -1;
else
ret = (int)written;
}
return ret;
}
int BIO_gets(BIO *b, char *in, int inl)
int BIO_gets(BIO *b, char *out, int outl)
{
int i;
long (*cb) (BIO *, int, const char *, int, long, long);
int ret;
size_t read;
if ((b == NULL) || (b->method == NULL) || (b->method->bgets == NULL)) {
BIOerr(BIO_F_BIO_GETS, BIO_R_UNSUPPORTED_METHOD);
return (-2);
}
cb = b->callback;
if ((cb != NULL) && ((i = (int)cb(b, BIO_CB_GETS, in, inl, 0L, 1L)) <= 0))
return (i);
if (b->callback != NULL || b->callback_ex != NULL) {
ret = (int)bio_call_callback(b, BIO_CB_GETS, out, outl, 0, 0L, 1, NULL);
if (ret <= 0)
return ret;
}
if (!b->init) {
BIOerr(BIO_F_BIO_GETS, BIO_R_UNINITIALIZED);
return (-2);
}
i = b->method->bgets(b, in, inl);
ret = b->method->bgets(b, out, outl);
if (cb != NULL)
i = (int)cb(b, BIO_CB_GETS | BIO_CB_RETURN, in, inl, 0L, (long)i);
return (i);
if (ret > 0) {
read = ret;
ret = 1;
}
if (b->callback != NULL || b->callback_ex != NULL)
ret = (int)bio_call_callback(b, BIO_CB_GETS | BIO_CB_RETURN, out, outl,
0, 0L, ret, &read);
if (ret > 0) {
if (read > INT_MAX)
ret = -1;
else
ret = (int)read;
}
return ret;
}
int BIO_indent(BIO *b, int indent, int max)
@ -424,27 +463,28 @@ void *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)
{
long ret;
long (*cb) (BIO *, int, const char *, int, long, long);
if (b == NULL)
return (0);
return 0;
if ((b->method == NULL) || (b->method->ctrl == NULL)) {
BIOerr(BIO_F_BIO_CTRL, BIO_R_UNSUPPORTED_METHOD);
return (-2);
return -2;
}
cb = b->callback;
if ((cb != NULL) &&
((ret = cb(b, BIO_CB_CTRL, parg, cmd, larg, 1L)) <= 0))
return (ret);
if (b->callback != NULL || b->callback_ex != NULL) {
ret = bio_call_callback(b, BIO_CB_CTRL, parg, 0, cmd, larg, 1L, NULL);
if (ret <= 0)
return ret;
}
ret = b->method->ctrl(b, cmd, larg, parg);
if (cb != NULL)
ret = cb(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, cmd, larg, ret);
return (ret);
if (b->callback != NULL || b->callback_ex != NULL)
ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, 0, cmd,
larg, ret, NULL);
return ret;
}
long BIO_callback_ctrl(BIO *b, int cmd,
@ -452,7 +492,6 @@ long BIO_callback_ctrl(BIO *b, int cmd,
long, long))
{
long ret;
long (*cb) (BIO *, int, const char *, int, long, long);
if (b == NULL)
return (0);
@ -462,17 +501,20 @@ long BIO_callback_ctrl(BIO *b, int cmd,
return (-2);
}
cb = b->callback;
if ((cb != NULL) &&
((ret = cb(b, BIO_CB_CTRL, (void *)&fp, cmd, 0, 1L)) <= 0))
return (ret);
if (b->callback != NULL || b->callback_ex != NULL) {
ret = bio_call_callback(b, BIO_CB_CTRL, (void *)&fp, 0, cmd, 0, 1L,
NULL);
if (ret <= 0)
return ret;
}
ret = b->method->callback_ctrl(b, cmd, fp);
if (cb != NULL)
ret = cb(b, BIO_CB_CTRL | BIO_CB_RETURN, (void *)&fp, cmd, 0, ret);
return (ret);
if (b->callback != NULL || b->callback_ex != NULL)
ret = bio_call_callback(b, BIO_CB_CTRL | BIO_CB_RETURN, (void *)&fp, 0,
cmd, 0, ret, NULL);
return ret;
}
/*
@ -615,6 +657,7 @@ BIO *BIO_dup_chain(BIO *in)
if ((new_bio = BIO_new(bio->method)) == NULL)
goto err;
new_bio->callback = bio->callback;
new_bio->callback_ex = bio->callback_ex;
new_bio->cb_arg = bio->cb_arg;
new_bio->init = bio->init;
new_bio->shutdown = bio->shutdown;

View File

@ -241,8 +241,7 @@ typedef long (*BIO_callback_fn)(BIO *b, int oper, const char *argp, int argi,
long argl, long ret);
typedef long (*BIO_callback_fn_ex)(BIO *b, int oper, const char *argp,
size_t len, int argi,
long argl, int ret, size_t *processed,
long *lret);
long argl, int ret, size_t *processed);
BIO_callback_fn BIO_get_callback(const BIO *b);
void BIO_set_callback(BIO *b, BIO_callback_fn callback);