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Author SHA1 Message Date
Simon Butcher
282911eabf Merge remote-tracking branch 'public/pr/2978' into baremetal 2020-01-08 18:14:21 +00:00
Simon Butcher
01d78fcefe Merge remote-tracking branch 'public/pr/2971' into baremetal 2020-01-08 18:10:44 +00:00
Simon Butcher
2d9c0eb215 Merge remote-tracking branch 'public/pr/2948' into baremetal 2020-01-08 18:08:28 +00:00
Simon Butcher
4b3b8c208e Merge remote-tracking branch 'public/pr/2886' into baremetal 2020-01-08 17:53:43 +00:00
Simon Butcher
5dc7faf56e Merge remote-tracking branch 'public/pr/2956' into baremetal 2020-01-08 17:53:16 +00:00
Jarno Lamsa
bb86c52430 Protect get/put on secret data on sha256-module 
When reading the input, the buffer will be initialised with random data
and the reading will start from a random offset. When writing the data,
the output will be initialised with random data and the writing will
start from a random offset.
 2020-01-08 10:45:51 +02:00
Teppo Järvelin
cafb6c91b0 Clear internal decrypted buffer after read 2020-01-08 10:25:16 +02:00
Arto Kinnunen
0a8f87f5eb Remove entropy source overwrite in baremetal_test 
-Do not overwrite MBEDTLS_ENTROPY_MAX_SOURCES in baremetal_test.h
-Skip tests that are not suitable for low number of entropy sources
 2020-01-07 14:48:33 +02:00
Arto Kinnunen
7195571681 Replace mbedtls_platform_enforce_volatile_reads 2 
Replace remaining mbedtls_platform_enforce_volatile_reads() with
mbedtls_platform_random_delay().
 2020-01-07 10:47:58 +02:00
Arto Kinnunen
e91f0dc905 Replace mbedtls_platform_enforce_volatile_reads 
Replace function mbedtls_platform_enforce_volatile_reads() with
mbedtls_platform_random_delay().
 2020-01-07 10:47:58 +02:00
Arto Kinnunen
dbf2b43ceb Add more variation to random delay countermeasure 
Add more variation to the random delay function by xor:ing two
variables. It is not enough to increment just a counter to create a
delay as it will be visible as uniform delay that can be easily
removed from the trace by analysis.
 2020-01-07 10:47:58 +02:00
Arto Kinnunen
0490485be5 Add random delay to enforce_volatile_reads 
Add a random delay to mbedtls_platform_enforce_volatile_reads() as a
countermeasure to fault injection attacks.
 2020-01-07 10:47:58 +02:00
Arto Kinnunen
9a506e7424 Update comments of mbedtls_platform_random_delay 2020-01-07 10:47:58 +02:00
Arto Kinnunen
b47b105838 Follow Mbed TLS coding style 2020-01-07 10:47:58 +02:00
Arto Kinnunen
4c63b98e94 Add random delay function to platform_utils 
Add delay function to platform_utils. The function will delay
program execution by incrementing local variable randomised number of
times.
 2020-01-07 10:47:58 +02:00
Teppo Järvelin
c2fa3eaa81 Removed dead code after optimization in tinycrypt 2020-01-05 12:02:37 +02:00
Teppo Järvelin
8f7e36fc98 Coverity fixes, check hmac return values 2020-01-05 12:02:37 +02:00
Teppo Järvelin
0b1d7d946d Coverity fix: dead error condition removed from ecc.c 2020-01-05 12:02:04 +02:00
Simon Butcher
7d2434fac2 Merge remote-tracking branch 'public/pr/2973' into baremetal 2020-01-03 15:52:36 +00:00
Darryl Green
029fe86c53 Fix some pylint warnings 
Fix a too-long line to meet PEP8 standards
 2020-01-03 13:41:20 +00:00
Simon Butcher
1b370a63ec Merge remote-tracking branch 'public/pr/2960' into baremetal 2019-12-27 18:18:22 +00:00
Simon Butcher
58813498f7 Merge remote-tracking branch 'public/pr/2957' into baremetal 2019-12-27 18:18:04 +00:00
Jarno Lamsa
5aa4c07b85 Minor review fixes 2019-12-20 13:09:27 +02:00
Jarno Lamsa
015aa44b93 Make authmode volatile 
This is to enforce reading it from memory for the double
check to prevent compiler from optimising it away.
 2019-12-20 12:09:37 +02:00
Jarno Lamsa
af60cd7698 Protect the peer_authenticated flag more 
Add more protection to the flag preventing attacker
possibly to glitch using faulty certificate.
 2019-12-20 10:50:33 +02:00
Jarno Lamsa
616fbe177c Increase hamming distance for authmode 
Prevent glitching mode by single bit flipping.
 2019-12-19 17:07:35 +02:00
Jarno Lamsa
8d09e5744c Increase hamming distance for session resume flag 
This is to prevent glitching a single bit for the resume flag.
 2019-12-19 17:07:35 +02:00
Jarno Lamsa
489dccd158 Adress review comments 2019-12-19 17:07:35 +02:00
Jarno Lamsa
88db2ae9a0 Use Platform fault when double check fails 2019-12-19 17:07:35 +02:00
Jarno Lamsa
f5b6af01d3 Fix double check in entropy_gather_internal 
The double check was wrong way, glitching either check
could have compromised the flow there.
 2019-12-19 17:07:29 +02:00
Jarno Lamsa
afff4d0679 Remove unused flag 2019-12-19 14:41:56 +02:00
Jarno Lamsa
06164057b3 Check that we have all the proper keys 
The proper keys should be set at the end of
the handshake, if not, fail the handshake.
 2019-12-19 14:40:36 +02:00
Jarno Lamsa
e1621d4700 Check that the peer_authenticated flag 
Check that the peer has been authenticated in the end
of the handshake.
 2019-12-19 14:29:24 +02:00
Jarno Lamsa
ba4730fe4c Protect setting of peer_authenticated flag 
Use flow counting and double checks when setting the flag.
Also protect the flow to prevent causing a glitch.
 2019-12-19 09:43:25 +02:00
Jarno Lamsa
4031a45019 Protect key_derivation_done flag 
The flag is used to track that the key derivation
has been done.
 2019-12-19 09:43:25 +02:00
Jarno Lamsa
67f0a1e833 Protect setting of premaster_generated flag 
The flag is used for tracking if the premaster has
been succesfully generated. Note that when resuming
a session, the flag should not be used when trying to
notice if all the key generation/derivation has been done.
 2019-12-19 09:43:19 +02:00
Jarno Lamsa
98801af26b Protect setting of hello_random flag 
The handshake flag tells when the handshake hello.random
is set and can be used later to decide if we have the correct
keys.
 2019-12-19 09:02:02 +02:00
Jarno Lamsa
b57d7fd568 Add flags for protecting TLS state machine 
Flags are there to prevent skipping vital parts of the TLS
handshake.
 2019-12-19 09:01:54 +02:00
Jarno Lamsa
6122b59042 Address review comments 2019-12-19 07:56:10 +02:00
Jarno Lamsa
46afd5d8fa Fix CI issues 
Default flow assumes failure causes multiple issues with
compatibility tests when the return value is initialised
with error value in ssl_in_server_key_exchange_parse.
The function would need a significant change in structure for this.
 2019-12-19 07:56:10 +02:00
Jarno Lamsa
91dbb79ae4 Fix error return code 2019-12-19 07:56:10 +02:00
Jarno Lamsa
b83a2136d6 Protect the return value from mbedtls_pk_verify 
Add double checks to the return value and default flow assumes
failure.
 2019-12-19 07:56:10 +02:00
Jarno Lamsa
47aab8da8a Protect return value from mbedtls_pk_verify 
Use double checks and default flow assumes failure.
 2019-12-19 07:56:10 +02:00
Jarno Lamsa
83a56a630a Double check mbedtls_pk_verify 
The verification could be skipped in server, changed the default flow
so that the handshake status is ever updated if the verify
succeeds, and that is checked twice.
 2019-12-19 07:56:10 +02:00
Jarno Lamsa
9e8e820993 Increase hamming distance for some error codes 
The MBEDTLS_ERR_SSL_WANT_READ and MBEDTLS_ERR_SSL_WANT_WRITE are
errors that can be ignored, so increase the hamming distance between
them and the non-ignorable errors and keep still some distance from
a success case. This mitigates an attack where single bit-flipping could
change a non-ignorable error to being an ignorable one.
 2019-12-19 07:56:10 +02:00
Jarno Lamsa
acb5eb00ca Add a double check to protect from glitch 
Check that the encryption has been done for the outbut buffer.
This is to ensure that glitching out the encryption doesn't
result as a unecrypted buffer to be sent.
 2019-12-19 07:56:10 +02:00
Jarno Lamsa
d05da1fa45 Add double check for checking if source is strong 
To prevent glitching past a strong source.
 2019-12-19 07:56:10 +02:00
Jarno Lamsa
552e8f2d6a Add double check to entropy-loop 
To prevent glitching and going through without strong source
 2019-12-19 07:56:10 +02:00
Jarno Lamsa
4708d66af5 Change the mbedtls_ssl_states values 
The changed values have now the minimum hamming distance
of 16 from each other. This is to prevent changing the state
by just flipping one bit.
 2019-12-19 07:56:10 +02:00
Jarno Lamsa
b01800974f Use invalid state 
If mismatch in the state has been noticed, use
the invalid state.
 2019-12-19 07:56:10 +02:00