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Add a test for signing content with a long ECDSA key

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Due to the way the current PK API works, it may have not been clear
for the library clients, how big output buffers they should pass
to the signing functions. Depending on the key type they depend on
MPI or EC specific compile-time constants.

Inside the library, there were places, where it was assumed that
the MPI size will always be enough, even for ECDSA signatures.
However, for very small sizes of the MBEDTLS_MPI_MAX_SIZE and
sufficiently large key, the EC signature could exceed the MPI size
and cause a stack overflow.

This test establishes both conditions -- small MPI size and the use
of a long ECDSA key -- and attempts to sign an arbitrary file.
This can cause a stack overvlow if the signature buffers are not
big enough, therefore the test is performed for an ASan build.
This commit is contained in:
k-stachowiak 2019-06-04 13:14:58 +02:00
parent 4e36da32b3
commit 11f38e2f61
3 changed files with 25 additions and 0 deletions
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8
tests/data_files/Makefile
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@ -745,6 +745,14 @@ server5.req.ku.sha1: server5.key
$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< key_usage=digital_signature,non_repudiation subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA1
all_final += server5.req.ku.sha1
###
### A generic SECP521R1 private key
###
secp521r1_prv.der:
$(OPENSSL) ecparam -genkey -name secp521r1 -noout -out secp521r1_prv.der
all_final += secp521r1_prv.der
################################################################
### Generate CSRs for X.509 write test suite
################################################################

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tests/data_files/secp521r1_prv.der Normal file
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17
tests/scripts/all.sh
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@ -590,6 +590,23 @@ component_check_doxygen_warnings () {
#### Build and test many configurations and targets
################################################################
component_test_large_ecdsa_key_signature () {
SMALL_MPI_MAX_SIZE=136 # Small enough to interfere with the EC signatures
msg "build: cmake + MBEDTLS_MPI_MAX_SIZE=${SMALL_MPI_MAX_SIZE}, gcc, ASan" # ~ 1 min 50s
scripts/config.pl set MBEDTLS_MPI_MAX_SIZE $SMALL_MPI_MAX_SIZE
CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
make
INEVITABLY_PRESENT_FILE=Makefile
SIGNATURE_FILE="${INEVITABLY_PRESENT_FILE}.sig" # Warning, this is rm -f'ed below
msg "test: pk_sign secp521r1_prv.der for MBEDTLS_MPI_MAX_SIZE=${SMALL_MPI_MAX_SIZE} (ASan build)" # ~ 5s
if_build_succeeded programs/pkey/pk_sign tests/data_files/secp521r1_prv.der $INEVITABLY_PRESENT_FILE
rm -f $SIGNATURE_FILE
}
component_test_default_out_of_box () {
msg "build: make, default config (out-of-box)" # ~1min
make