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Signed-off-by: Gilles Peskine <[email protected]>
This commit is contained in:
Gilles Peskine
2023-01-11 14:50:10 +01:00
parent fd13a0f851
commit 449bd8303e
442 changed files with 86726 additions and 89429 deletions
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library/mps_reader.c
+160 -167
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@@ -67,54 +67,56 @@ static int mbedtls_mps_trace_id = MBEDTLS_MPS_TRACE_BIT_READER;
*/
static inline int mps_reader_is_accumulating(
mbedtls_mps_reader const *rd )
mbedtls_mps_reader const *rd)
{
mbedtls_mps_size_t acc_remaining;
if( rd->acc == NULL )
return( 0 );
if (rd->acc == NULL) {
return 0;
}
acc_remaining = rd->acc_share.acc_remaining;
return( acc_remaining > 0 );
return acc_remaining > 0;
}
static inline int mps_reader_is_producing(
mbedtls_mps_reader const *rd )
mbedtls_mps_reader const *rd)
{
unsigned char *frag = rd->frag;
return( frag == NULL );
return frag == NULL;
}
static inline int mps_reader_is_consuming(
mbedtls_mps_reader const *rd )
mbedtls_mps_reader const *rd)
{
return( !mps_reader_is_producing( rd ) );
return !mps_reader_is_producing(rd);
}
static inline mbedtls_mps_size_t mps_reader_get_fragment_offset(
mbedtls_mps_reader const *rd )
mbedtls_mps_reader const *rd)
{
unsigned char *acc = rd->acc;
mbedtls_mps_size_t frag_offset;
if( acc == NULL )
return( 0 );
if (acc == NULL) {
return 0;
}
frag_offset = rd->acc_share.frag_offset;
return( frag_offset );
return frag_offset;
}
static inline mbedtls_mps_size_t mps_reader_serving_from_accumulator(
mbedtls_mps_reader const *rd )
mbedtls_mps_reader const *rd)
{
mbedtls_mps_size_t frag_offset, end;
frag_offset = mps_reader_get_fragment_offset( rd );
frag_offset = mps_reader_get_fragment_offset(rd);
end = rd->end;
return( end < frag_offset );
return end < frag_offset;
}
static inline void mps_reader_zero( mbedtls_mps_reader *rd )
static inline void mps_reader_zero(mbedtls_mps_reader *rd)
{
/* A plain memset() would likely be more efficient,
* but the current way of zeroing makes it harder
@@ -123,56 +125,56 @@ static inline void mps_reader_zero( mbedtls_mps_reader *rd )
* doesn't require reasoning about structs being
* interpreted as unstructured binary blobs. */
static mbedtls_mps_reader const zero =
{ .frag = NULL,
.frag_len = 0,
.commit = 0,
.end = 0,
.pending = 0,
.acc = NULL,
.acc_len = 0,
.acc_available = 0,
.acc_share = { .acc_remaining = 0 }
};
{ .frag = NULL,
.frag_len = 0,
.commit = 0,
.end = 0,
.pending = 0,
.acc = NULL,
.acc_len = 0,
.acc_available = 0,
.acc_share = { .acc_remaining = 0 } };
*rd = zero;
}
int mbedtls_mps_reader_init( mbedtls_mps_reader *rd,
unsigned char *acc,
mbedtls_mps_size_t acc_len )
int mbedtls_mps_reader_init(mbedtls_mps_reader *rd,
unsigned char *acc,
mbedtls_mps_size_t acc_len)
{
MBEDTLS_MPS_TRACE_INIT( "mbedtls_mps_reader_init" );
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"* Accumulator size: %u bytes", (unsigned) acc_len );
mps_reader_zero( rd );
MBEDTLS_MPS_TRACE_INIT("mbedtls_mps_reader_init");
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"* Accumulator size: %u bytes", (unsigned) acc_len);
mps_reader_zero(rd);
rd->acc = acc;
rd->acc_len = acc_len;
MBEDTLS_MPS_TRACE_RETURN( 0 );
MBEDTLS_MPS_TRACE_RETURN(0);
}
int mbedtls_mps_reader_free( mbedtls_mps_reader *rd )
int mbedtls_mps_reader_free(mbedtls_mps_reader *rd)
{
MBEDTLS_MPS_TRACE_INIT( "mbedtls_mps_reader_free" );
mps_reader_zero( rd );
MBEDTLS_MPS_TRACE_RETURN( 0 );
MBEDTLS_MPS_TRACE_INIT("mbedtls_mps_reader_free");
mps_reader_zero(rd);
MBEDTLS_MPS_TRACE_RETURN(0);
}
int mbedtls_mps_reader_feed( mbedtls_mps_reader *rd,
unsigned char *new_frag,
mbedtls_mps_size_t new_frag_len )
int mbedtls_mps_reader_feed(mbedtls_mps_reader *rd,
unsigned char *new_frag,
mbedtls_mps_size_t new_frag_len)
{
mbedtls_mps_size_t copy_to_acc;
MBEDTLS_MPS_TRACE_INIT( "mbedtls_mps_reader_feed" );
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"* Fragment length: %u bytes", (unsigned) new_frag_len );
MBEDTLS_MPS_TRACE_INIT("mbedtls_mps_reader_feed");
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"* Fragment length: %u bytes", (unsigned) new_frag_len);
if( new_frag == NULL )
MBEDTLS_MPS_TRACE_RETURN( MBEDTLS_ERR_MPS_READER_INVALID_ARG );
if (new_frag == NULL) {
MBEDTLS_MPS_TRACE_RETURN(MBEDTLS_ERR_MPS_READER_INVALID_ARG);
}
MBEDTLS_MPS_STATE_VALIDATE_RAW( mps_reader_is_producing( rd ),
"mbedtls_mps_reader_feed() requires reader to be in producing mode" );
MBEDTLS_MPS_STATE_VALIDATE_RAW(mps_reader_is_producing(
rd),
"mbedtls_mps_reader_feed() requires reader to be in producing mode");
if( mps_reader_is_accumulating( rd ) )
{
if (mps_reader_is_accumulating(rd)) {
unsigned char *acc = rd->acc;
mbedtls_mps_size_t acc_remaining = rd->acc_share.acc_remaining;
mbedtls_mps_size_t acc_available = rd->acc_available;
@@ -181,39 +183,38 @@ int mbedtls_mps_reader_feed( mbedtls_mps_reader *rd,
acc += acc_available;
copy_to_acc = acc_remaining;
if( copy_to_acc > new_frag_len )
if (copy_to_acc > new_frag_len) {
copy_to_acc = new_frag_len;
}
/* Copy new contents to accumulator. */
memcpy( acc, new_frag, copy_to_acc );
memcpy(acc, new_frag, copy_to_acc);
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Copy new data of size %u of %u into accumulator at offset %u",
(unsigned) copy_to_acc, (unsigned) new_frag_len, (unsigned) acc_available );
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Copy new data of size %u of %u into accumulator at offset %u",
(unsigned) copy_to_acc, (unsigned) new_frag_len,
(unsigned) acc_available);
/* Check if, with the new fragment, we have enough data. */
acc_remaining -= copy_to_acc;
if( acc_remaining > 0 )
{
if (acc_remaining > 0) {
/* We need to accumulate more data. Stay in producing mode. */
acc_available += copy_to_acc;
rd->acc_share.acc_remaining = acc_remaining;
rd->acc_available = acc_available;
MBEDTLS_MPS_TRACE_RETURN( MBEDTLS_ERR_MPS_READER_NEED_MORE );
MBEDTLS_MPS_TRACE_RETURN(MBEDTLS_ERR_MPS_READER_NEED_MORE);
}
/* We have filled the accumulator: Move to consuming mode. */
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Enough data available to serve user request" );
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Enough data available to serve user request");
/* Remember overlap of accumulator and fragment. */
rd->acc_share.frag_offset = acc_available;
acc_available += copy_to_acc;
rd->acc_available = acc_available;
}
else /* Not accumulating */
{
} else { /* Not accumulating */
rd->acc_share.frag_offset = 0;
}
@@ -221,30 +222,30 @@ int mbedtls_mps_reader_feed( mbedtls_mps_reader *rd,
rd->frag_len = new_frag_len;
rd->commit = 0;
rd->end = 0;
MBEDTLS_MPS_TRACE_RETURN( 0 );
MBEDTLS_MPS_TRACE_RETURN(0);
}
int mbedtls_mps_reader_get( mbedtls_mps_reader *rd,
mbedtls_mps_size_t desired,
unsigned char **buffer,
mbedtls_mps_size_t *buflen )
int mbedtls_mps_reader_get(mbedtls_mps_reader *rd,
mbedtls_mps_size_t desired,
unsigned char **buffer,
mbedtls_mps_size_t *buflen)
{
unsigned char *frag;
mbedtls_mps_size_t frag_len, frag_offset, end, frag_fetched, frag_remaining;
MBEDTLS_MPS_TRACE_INIT( "mbedtls_mps_reader_get" );
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"* Bytes requested: %u", (unsigned) desired );
MBEDTLS_MPS_TRACE_INIT("mbedtls_mps_reader_get");
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"* Bytes requested: %u", (unsigned) desired);
MBEDTLS_MPS_STATE_VALIDATE_RAW( mps_reader_is_consuming( rd ),
"mbedtls_mps_reader_get() requires reader to be in consuming mode" );
MBEDTLS_MPS_STATE_VALIDATE_RAW(mps_reader_is_consuming(
rd),
"mbedtls_mps_reader_get() requires reader to be in consuming mode");
end = rd->end;
frag_offset = mps_reader_get_fragment_offset( rd );
frag_offset = mps_reader_get_fragment_offset(rd);
/* Check if we're still serving from the accumulator. */
if( mps_reader_serving_from_accumulator( rd ) )
{
if (mps_reader_serving_from_accumulator(rd)) {
/* Illustration of supported and unsupported cases:
*
* - Allowed #1
@@ -310,14 +311,12 @@ int mbedtls_mps_reader_get( mbedtls_mps_reader *rd,
unsigned char *acc;
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Serve the request from the accumulator" );
if( frag_offset - end < desired )
{
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Serve the request from the accumulator");
if (frag_offset - end < desired) {
mbedtls_mps_size_t acc_available;
acc_available = rd->acc_available;
if( acc_available - end != desired )
{
if (acc_available - end != desired) {
/* It might be possible to serve some of these situations by
* making additional space in the accumulator, removing those
* parts that have already been committed.
@@ -329,7 +328,7 @@ int mbedtls_mps_reader_get( mbedtls_mps_reader *rd,
* the library, this check is a good opportunity to
* validate this. */
MBEDTLS_MPS_TRACE_RETURN(
MBEDTLS_ERR_MPS_READER_INCONSISTENT_REQUESTS );
MBEDTLS_ERR_MPS_READER_INCONSISTENT_REQUESTS);
}
}
@@ -337,19 +336,20 @@ int mbedtls_mps_reader_get( mbedtls_mps_reader *rd,
acc += end;
*buffer = acc;
if( buflen != NULL )
if (buflen != NULL) {
*buflen = desired;
}
end += desired;
rd->end = end;
rd->pending = 0;
MBEDTLS_MPS_TRACE_RETURN( 0 );
MBEDTLS_MPS_TRACE_RETURN(0);
}
/* Attempt to serve the request from the current fragment */
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Serve the request from the current fragment." );
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Serve the request from the current fragment.");
frag_len = rd->frag_len;
frag_fetched = end - frag_offset; /* The amount of data from the current
@@ -358,23 +358,20 @@ int mbedtls_mps_reader_get( mbedtls_mps_reader *rd,
frag_remaining = frag_len - frag_fetched; /* Remaining data in fragment */
/* Check if we can serve the read request from the fragment. */
if( frag_remaining < desired )
{
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"There's not enough data in the current fragment "
"to serve the request." );
if (frag_remaining < desired) {
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"There's not enough data in the current fragment "
"to serve the request.");
/* There's not enough data in the current fragment,
* so either just RETURN what we have or fail. */
if( buflen == NULL )
{
if( frag_remaining > 0 )
{
if (buflen == NULL) {
if (frag_remaining > 0) {
rd->pending = desired - frag_remaining;
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Remember to collect %u bytes before re-opening",
(unsigned) rd->pending );
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Remember to collect %u bytes before re-opening",
(unsigned) rd->pending);
}
MBEDTLS_MPS_TRACE_RETURN( MBEDTLS_ERR_MPS_READER_OUT_OF_DATA );
MBEDTLS_MPS_TRACE_RETURN(MBEDTLS_ERR_MPS_READER_OUT_OF_DATA);
}
desired = frag_remaining;
@@ -387,41 +384,45 @@ int mbedtls_mps_reader_get( mbedtls_mps_reader *rd,
frag += frag_fetched;
*buffer = frag;
if( buflen != NULL )
if (buflen != NULL) {
*buflen = desired;
}
end += desired;
rd->end = end;
rd->pending = 0;
MBEDTLS_MPS_TRACE_RETURN( 0 );
MBEDTLS_MPS_TRACE_RETURN(0);
}
int mbedtls_mps_reader_commit( mbedtls_mps_reader *rd )
int mbedtls_mps_reader_commit(mbedtls_mps_reader *rd)
{
mbedtls_mps_size_t end;
MBEDTLS_MPS_TRACE_INIT( "mbedtls_mps_reader_commit" );
MBEDTLS_MPS_STATE_VALIDATE_RAW( mps_reader_is_consuming( rd ),
"mbedtls_mps_reader_commit() requires reader to be in consuming mode" );
MBEDTLS_MPS_TRACE_INIT("mbedtls_mps_reader_commit");
MBEDTLS_MPS_STATE_VALIDATE_RAW(mps_reader_is_consuming(
rd),
"mbedtls_mps_reader_commit() requires reader to be in consuming mode");
end = rd->end;
rd->commit = end;
MBEDTLS_MPS_TRACE_RETURN( 0 );
MBEDTLS_MPS_TRACE_RETURN(0);
}
int mbedtls_mps_reader_reclaim( mbedtls_mps_reader *rd,
int *paused )
int mbedtls_mps_reader_reclaim(mbedtls_mps_reader *rd,
int *paused)
{
unsigned char *frag, *acc;
mbedtls_mps_size_t pending, commit;
mbedtls_mps_size_t acc_len, frag_offset, frag_len;
MBEDTLS_MPS_TRACE_INIT( "mbedtls_mps_reader_reclaim" );
MBEDTLS_MPS_TRACE_INIT("mbedtls_mps_reader_reclaim");
if( paused != NULL )
if (paused != NULL) {
*paused = 0;
}
MBEDTLS_MPS_STATE_VALIDATE_RAW( mps_reader_is_consuming( rd ),
"mbedtls_mps_reader_reclaim() requires reader to be in consuming mode" );
MBEDTLS_MPS_STATE_VALIDATE_RAW(mps_reader_is_consuming(
rd),
"mbedtls_mps_reader_reclaim() requires reader to be in consuming mode");
frag = rd->frag;
acc = rd->acc;
@@ -429,30 +430,26 @@ int mbedtls_mps_reader_reclaim( mbedtls_mps_reader *rd,
commit = rd->commit;
frag_len = rd->frag_len;
frag_offset = mps_reader_get_fragment_offset( rd );
frag_offset = mps_reader_get_fragment_offset(rd);
if( pending == 0 )
{
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"No unsatisfied read-request has been logged." );
if (pending == 0) {
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"No unsatisfied read-request has been logged.");
/* Check if there's data left to be consumed. */
if( commit < frag_offset || commit - frag_offset < frag_len )
{
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"There is data left to be consumed." );
if (commit < frag_offset || commit - frag_offset < frag_len) {
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"There is data left to be consumed.");
rd->end = commit;
MBEDTLS_MPS_TRACE_RETURN( MBEDTLS_ERR_MPS_READER_DATA_LEFT );
MBEDTLS_MPS_TRACE_RETURN(MBEDTLS_ERR_MPS_READER_DATA_LEFT);
}
rd->acc_available = 0;
rd->acc_share.acc_remaining = 0;
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Fragment has been fully processed and committed." );
}
else
{
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Fragment has been fully processed and committed.");
} else {
int overflow;
mbedtls_mps_size_t acc_backup_offset;
@@ -463,31 +460,27 @@ int mbedtls_mps_reader_reclaim( mbedtls_mps_reader *rd,
mbedtls_mps_size_t backup_len;
mbedtls_mps_size_t acc_len_needed;
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"There has been an unsatisfied read with %u bytes overhead.",
(unsigned) pending );
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"There has been an unsatisfied read with %u bytes overhead.",
(unsigned) pending);
if( acc == NULL )
{
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"No accumulator present" );
if (acc == NULL) {
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"No accumulator present");
MBEDTLS_MPS_TRACE_RETURN(
MBEDTLS_ERR_MPS_READER_NEED_ACCUMULATOR );
MBEDTLS_ERR_MPS_READER_NEED_ACCUMULATOR);
}
acc_len = rd->acc_len;
/* Check if the upper layer has already fetched
* and committed the contents of the accumulator. */
if( commit < frag_offset )
{
if (commit < frag_offset) {
/* No, accumulator is still being processed. */
frag_backup_offset = 0;
frag_backup_len = frag_len;
acc_backup_offset = commit;
acc_backup_len = frag_offset - commit;
}
else
{
} else {
/* Yes, the accumulator is already processed. */
frag_backup_offset = commit - frag_offset;
frag_backup_len = frag_len - frag_backup_offset;
@@ -499,47 +492,47 @@ int mbedtls_mps_reader_reclaim( mbedtls_mps_reader *rd,
acc_len_needed = backup_len + pending;
overflow = 0;
overflow |= ( backup_len < acc_backup_len );
overflow |= ( acc_len_needed < backup_len );
overflow |= (backup_len < acc_backup_len);
overflow |= (acc_len_needed < backup_len);
if( overflow || acc_len < acc_len_needed )
{
if (overflow || acc_len < acc_len_needed) {
/* Except for the different return code, we behave as if
* there hadn't been a call to mbedtls_mps_reader_get()
* since the last commit. */
rd->end = commit;
rd->pending = 0;
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_ERROR,
"The accumulator is too small to handle the backup." );
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_ERROR,
"* Size: %u", (unsigned) acc_len );
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_ERROR,
"* Needed: %u (%u + %u)",
(unsigned) acc_len_needed,
(unsigned) backup_len, (unsigned) pending );
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_ERROR,
"The accumulator is too small to handle the backup.");
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_ERROR,
"* Size: %u", (unsigned) acc_len);
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_ERROR,
"* Needed: %u (%u + %u)",
(unsigned) acc_len_needed,
(unsigned) backup_len, (unsigned) pending);
MBEDTLS_MPS_TRACE_RETURN(
MBEDTLS_ERR_MPS_READER_ACCUMULATOR_TOO_SMALL );
MBEDTLS_ERR_MPS_READER_ACCUMULATOR_TOO_SMALL);
}
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Fragment backup: %u", (unsigned) frag_backup_len );
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Accumulator backup: %u", (unsigned) acc_backup_len );
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Fragment backup: %u", (unsigned) frag_backup_len);
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Accumulator backup: %u", (unsigned) acc_backup_len);
/* Move uncommitted parts from the accumulator to the front
* of the accumulator. */
memmove( acc, acc + acc_backup_offset, acc_backup_len );
memmove(acc, acc + acc_backup_offset, acc_backup_len);
/* Copy uncommitted parts of the current fragment to the
* accumulator. */
memcpy( acc + acc_backup_len,
frag + frag_backup_offset, frag_backup_len );
memcpy(acc + acc_backup_len,
frag + frag_backup_offset, frag_backup_len);
rd->acc_available = backup_len;
rd->acc_share.acc_remaining = pending;
if( paused != NULL )
if (paused != NULL) {
*paused = 1;
}
}
rd->frag = NULL;
@@ -549,11 +542,11 @@ int mbedtls_mps_reader_reclaim( mbedtls_mps_reader *rd,
rd->end = 0;
rd->pending = 0;
MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Final state: aa %u, al %u, ar %u",
(unsigned) rd->acc_available, (unsigned) rd->acc_len,
(unsigned) rd->acc_share.acc_remaining );
MBEDTLS_MPS_TRACE_RETURN( 0 );
MBEDTLS_MPS_TRACE(MBEDTLS_MPS_TRACE_TYPE_COMMENT,
"Final state: aa %u, al %u, ar %u",
(unsigned) rd->acc_available, (unsigned) rd->acc_len,
(unsigned) rd->acc_share.acc_remaining);
MBEDTLS_MPS_TRACE_RETURN(0);
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */