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Author SHA1 Message Date
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
Jarno Lamsa
70abd7aadc Add enumeration for invalid state 
The invalid state can be used when state-mismatch is noticed.
The invalid state should report a FI-alert upwards.
 2019-12-19 07:56:10 +02:00
Jarno Lamsa
2b20516b60 Make TLS state changes explicit 
This is to enable hardening the security when changing
states in state machine so that the state cannot be changed by bit flipping.
The later commit changes the enumerations so that the states have large
hamming distance in between them to prevent this kind of attack.
 2019-12-19 07:56:10 +02:00
Manuel Pégourié-Gonnard
a4b421819b Fix way to access the RNG for ECDSA counter-measures 
Duplicating the g_rng_function variable in ecc_dsa.c means it's not the same
as set in ecc.c, resulting if no randomisation here. The proper way to access
the RNG function from outside ecc.c is uECC_get_rng(), so use that.

This is a side-port of upstream commit
87d74dd8d64a99aaa188961fe763d0841c5abfef

I've verified that there are no other occurrences (the duplication of
g_rng_function in ecc_dh.c had already been removed earlier when centralising
projective coordinate randomisation to mult_safer()).
 2019-12-18 10:29:58 +01:00
Simon Butcher
171f422109 Merge remote-tracking branch 'public/pr/2952' into baremetal 2019-12-13 14:51:40 +00:00
Simon Butcher
e76c638d6f Merge remote-tracking branch 'public/pr/2925' into baremetal 2019-12-13 14:51:29 +00:00
Arto Kinnunen
6ce4988768 AES FI resistance 
Add FI countermeasures to AES.
 2019-12-10 15:00:37 +02:00