Store all handshake mesages in a buffer so that we can hash them
correctly when generating the master secret.
This change does not work correctly for DTLS retransmitted packets; that
are in the handshake as they will be hashed twice; which is bad. Looking
for ideas to implement this.
Bug: 10686
Change-Id: Ied01d4cc37b4270f325070a8d1630d3123577a0d
Reviewed-on: https://code.wireshark.org/review/5168
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Changed the entries so that users have access to the whole certificate in
tshark. This allows developers to process the certs in custom ways
Change-Id: I113d60b2b3f12c6b15a644ec02bbebf7134f0ece
Reviewed-on: https://code.wireshark.org/review/5119
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>
Patch "ssl,dtls: simplify keyfile handling" did not account for the use
case where packets are captured and decrypted on the fly using
SSLKEYLOGFILE.
This patch restores that functionality by reading additional lines from
the keylog file when needed (to preserve the benefit of not having to
read the full file) and by watching the open file for deletions.
"Deletion" is detected by comparing st_dev and st_ino. Since these may
be useless on Windows, the size is also checked.
Change-Id: Ieadaef1426a9270587293db28f4dda33b3d17334
Reviewed-on: https://code.wireshark.org/review/3190
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Evan Huus <eapache@gmail.com>
Petri-Dish: Evan Huus <eapache@gmail.com>
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>
Previously, the keylog file would be fully parsed when an encrypted
pre-master secret is encountered or in the ChangeCipherSpec stage. There
was also a lot of duplication in the key logfile parsing.
This patch simplifies the key logfile parsing by using regular
expressions. Rather than scanning the key logfile for a specific key,
do this scan once at ssl init and save the results to a hashtable. The
map for session ID/tickets to master keys already existed, another one
for client random to master key and encrypted pre-master to pre-master
was added. This could later also be wired to the "Export SSL Keys"
menu item for improved reliability (when no session ID or tickets are
available, the client random could be used).
The ssl_{save,restore}_session{,_ticket} functions have been converted
to a single function that looks up a key (sid / client random / encr.
pre-master) to a (pre-)master secret.
Other minor changes: return booleans for some functions that can only
fail/pass. Remove some functions from the ssl-utils header that have
become private a few commits ago. Remove some outstanding issues
from the comments in packet-ssl as they are already done, add myself
to the ssl-utils header.
These changes pass the test suite and the sample Session Ticket-enabled
capture from https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5963
On-the-fly decryption are broken with this patch since keylog files are
read once at the start of a capture. This will be solved in a future
patch.
Change-Id: Idb343abe161950b5f3ff61bee093d0f4ef9655bd
Reviewed-on: https://code.wireshark.org/review/3057
Reviewed-by: Evan Huus <eapache@gmail.com>
Petri-Dish: Evan Huus <eapache@gmail.com>
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Reviewed-by: Michael Mann <mmann78@netscape.net>
It was not clear whether the data_len member of StringInfo refers to
the allocated memory (as was done for session_ticket) or the length
of the actual data. This is clarified in a comment. To keep the
invariant "data_len refers to the length of meaningful data", some
code has been moved just in case some intermediate code fails:
- Setting session_ticket.data_len vs tvb_memcpy to session_ticket.data.
- PRF functions would expect the data length as input to a paramter
named "out". This is highly confusing, so another parameter has been
added to signify the requested length, "out_len". This also helps
holding up the invariant.
- For prf() calls, out.data_len does not need to be initialized but
passed as parameter.
Other PRF-related changes:
- Change the PRF functions to return a boolean instead of an int.
- tls_hash: return void as it cannot fail and remove related error
handling from callers. Fix a memleak of label_seed if tls_hash was
successful.
- tls_hash: add comments to clarify its functionality, whitespace.
- ssl3_generate_export_iv could not fail, so make it void. Also added
an out_len param to pass the target length.
- In prf(), replaced if-conditions for SSL version by a switch.
- In ssl_generate_keyring_material, the scope of some variable has been
tightened.
- ssl_session_init: explicitly set data_len to 0. This is strictly not
necessary as the callers have already zeroed out the memory, but that
has not been documented.
Other changes related to master_secret (ssl_save_session[_ticket]):
- Initialize master_secret.data_len to 0 in ssl_session_init as the
master_secret is unusable at that point.
- Remove the hack that tests whether master_secret.data is non-empty.
- Replace hardcoded master_secret length (48) from wmem_alloc0().
- Introduce macro for master secret length, use this in
SslDecryptSession, for parsing from keyfile and converting pre-master
secret to master secret (prf).
- Use (master_secret + 1) to refer to the part after the struct rather
than adding the size manually to a gchar-casted master_secret.
Change-Id: Ie1ea448db54e828b904568224486147a3d962522
Reviewed-on: https://code.wireshark.org/review/3030
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Changes:
- dtls: also support saving session tickets.
- Drop the length check and let proto_tree_add_item throw exceptions
on length errors.
- Use proto_tree_add_item instead of proto_tree_add_uint.
- Drop "TLS" from header field descriptions, the RFC does not name it
as such and DTLS can also use it (a draft is in progress that extends
DTLS with Session Tickets,
draft-hummen-dtls-extended-session-resumption-01).
Change-Id: I11195217368b7200821d11289b1c5870a1ffe637
Reviewed-on: https://code.wireshark.org/review/3029
Reviewed-by: Evan Huus <eapache@gmail.com>
Client/Server hello and Hello extensions are now dissected inside
ssl-utils, no need to export them for the SSL or DTLS dissectors.
Change-Id: I8f2405199f21616743fe74959f07cfa839565527
Reviewed-on: https://code.wireshark.org/review/3022
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Evan Huus <eapache@gmail.com>
Changes to ClientHello dissection:
- Move ssl_find_private_key (and its pre-req, ssl_set_server) outside
ssl_dissect_hnd_cli_hello. It has not really something to do with
dissection, but state tracking and decoder param feeding.
- dtls: add expert info for bad cipher suites len.
- ssl: remove bad cipher suites len text label which is also
available as expert info. Attach expert info to a the length proto
item (which is converted to use add_item instead of add_uint).
- Remove `if (tree || ssl)` since expert info seems not to apply
otherwise (this also needs changes in common and handshake
dissection).
- ssl: remove tvb_ensure_bytes_exist so we can dissect more
compression methods and cipher suites.
- Since DTLS has an additional Cookie field which TLS does not have,
pass these additional header fields through a struct whose type is
defined in ssl-utils.
Change-Id: I41bef04c1c3353e582e30f561d1d246a744e1d60
Reviewed-on: https://code.wireshark.org/review/3021
Reviewed-by: Evan Huus <eapache@gmail.com>
Changes to ServerHello:
- Get rid of session parameter as the SslDecryptSession already
provides a reference to SslSession. Done for the new
ssl_dissect_hnd_srv_hello and ssl_dissect_hnd_hello_ext functions.
- No need to generate the keyring here, decryption is only needed after
ChangeCipherSpec and the keyring will be generated there provided
that there are enough params (cipher, version, master-secret, etc.)
- Get rid of labels and goto in favor of if/else.
- DTLS: SSL_HAVE_SESSION_KEY is implicitly set when
ssl_generate_keyring_material succeeds, no need to set it. Remove it.
- Remove `if (tree || ssl)` since expert info seems not to apply
otherwise (this also needs changes in common and handshake
dissection). (Expert info from the TLS extensions, not the
ServerHello itself.)
Other changes:
- ClientHello: renamed some fields shared with ServerHello.
Change-Id: I466b905d990489e03250bac97bf9d862ff82ce6c
Reviewed-on: https://code.wireshark.org/review/3020
Reviewed-by: Evan Huus <eapache@gmail.com>
My previous change removed master-key retrieval in the Server Hello.
This broke decryption when ClientKeyExchange is missing. That was done
because decryption is only needed after ChangeCipherSpec.
This patch moves the remaining initialization in ClientKeyExchange to
ChangeCipherSpec. In theory this could fix decryption of DTLS traffic
when an abbreviated handshake is used (and thus keyring material is
never generated in ClientKeyExchange since it is not called).
It also avoids saving a session ticket with an empty key which can
happen when no RSA key is present, but the NewSessionTicket message
is received. This could lead to garbage decryption.
Change-Id: If0f475232c270b1d7b006c1f9af0e8d8098c6b65
Reviewed-on: https://code.wireshark.org/review/3019
Reviewed-by: Hauke Mehrtens <hauke@hauke-m.de>
Reviewed-by: Evan Huus <eapache@gmail.com>
Based on DTLS code with changes merged from SSL. Changes:
- Ignore large Session IDs, this was not harmful though since the
backing storage was 256 bytes in size.
- {ssl,dtls}.handshake.random: fixed description, it is not used like
a SSLv2 random challenge.
- dtls: also debug print client/server for random
- SSL: the common dissector now returns an offset rather than dissected
length.
- dtls: display actual Session ID bytes in the UI rather than the text
"Session ID (32 bytes)". The length field is already visible in the
preceding field.
Also changed is the handling of key material generation. The SSL
dissector previously generated key material based on the Session ID,
Session Ticket or a key logfile. (DTLS did not have this functionality.)
As decryption is needed only after ChangeCipherSpec, I have removed it
from the ServerHello handling. This will break decryption when a
ClientKeyExchange message is missing, but it will be restored proper in
a next patch.
(By the way, there was an inverted if-condition bug in DTLS that could
break decryption by not restoring the master key matching a SID. This
is gone in the refactoring because the faulty code is removed.)
Change-Id: Ida3de88adefe3f7691f85936c496977426c4d96e
Reviewed-on: https://code.wireshark.org/review/3018
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Hauke Mehrtens <hauke@hauke-m.de>
Reviewed-by: Evan Huus <eapache@gmail.com>
Except for field/expert_info names, a redundant subtree assignment,
a different !tree check, a type confusion in DTLS (proto_tree *ti),
a check against a different DTLS/TLS version and a (void) retval cast,
the functions are exactly the same. Extract them to ssl-utils.
Change-Id: I2ca7089fe2cd23212ef78656506cb53768f55927
Reviewed-on: https://code.wireshark.org/review/2986
Reviewed-by: Anders Broman <a.broman58@gmail.com>
There are no dissection differences between DTLS and SSL, so move to
ssl-utils. While at it, skip dissection when the tree is NULL, remove
the plural from certificates length (the length is always larger than
ome), fix type of "ti" for dtls, get rid of "failsafe" subtree
assignment in ssl, get rid of tvb_ensure_bytes_exist in ssl.
Unrelated changes: fix param (tvb vs sub_tvb) for DTLS KeyExchange
handshake messages.
Change-Id: Iecaa45a7a601e55a52aa16180cf219a122fbe95a
Reviewed-on: https://code.wireshark.org/review/2985
Reviewed-by: Anders Broman <a.broman58@gmail.com>
The DTLS dissector duplicated a handshake types check, this has been
eliminated. Convert HandshakeType and ContentType to enums to get the
benefit of compiler-checked switch cases. Move these checks to
ssl-utils.
Two default cases could never be reached since the dissector returns
immediately on an invalid ContentType.
Also fixed misleading debugging messages.
Change-Id: I07a2062564e073004dcc0401cd82538e5659fa0c
Reviewed-on: https://code.wireshark.org/review/2978
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Reviewed-by: Anders Broman <a.broman58@gmail.com>
Since DTLS and TLS do not differ in handling ClientKeyExchange and
ServerKeyExchange, its dissection got moved to ssl-utils. The code is
based on the SSL dissector, with header field names adjusted to the
DTLS ones (those got capitalized). Besides a version difference (for
signatures), the header field and function names, the DTLS and SSL code
are equal (this is verified).
This patch refactors the dissectors for DHE_RSA and ECDHE to make use of
a common function to dissect the signed_params field. All offset
tracking is also removed in favor of exception handling by the
proto_tree_add_item function. Occurrences of proto_tree_add_uint are
also replaced by proto_tree_add_item for simplicity.
After those changes, the SKE dissector for DH key exchanges is updated
to handle the mandatory signature field in TLSv1.2, using the newly
added function. (bug 9208)
Another bug occurred after the length check removal, pre-TLS and
OpenSSL's old DTLS implemenation do not include a vector length in
the CKE. This is now also fixed. (bug 10222)
Other minor changes: comments added/corrected, renamed
keyex_dh -> keyex_dhe (includes DHE_RSA and DHE_DSS).
Bug: 9208
Bug: 10222
Change-Id: I76e835d56a65c91facce46840d79c1c48ce8d5dd
Reviewed-on: https://code.wireshark.org/review/2542
Reviewed-by: Evan Huus <eapache@gmail.com>
Add better reference to IANA list of all extensions.
Add newer "channel_id" extension (0x7550) as used by current Chrome versions.
Change-Id: Ia5b2515c557fbaf42d320ede918120f83b2e02dd
Reviewed-on: https://code.wireshark.org/review/1924
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Instead of X.509 certificates now also Raw public keys are supported
and shown correctly.
This is described in this draft:
https://tools.ietf.org/html/draft-ietf-tls-oob-pubkey-11
Change-Id: Ibe7610aace31a19791b02e71ccd8d9ceb8cf979d
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Reviewed-on: https://code.wireshark.org/review/1372
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
This analyses the certificate type extensions and then stores the
certificate type in the ssl session. This way we can later show the
certificate in the correct from.
This is described in this draft:
https://tools.ietf.org/html/draft-ietf-tls-oob-pubkey-11
Change-Id: Ifdda165807bc29f1fc138da000a9a538ecd18b6e
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Reviewed-on: https://code.wireshark.org/review/1371
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
This structure is used to store information about a SSL session which
is not only needed for decrypting the session, but also to show nice
dissection information.
In an other patch I will add some more members to the struct because
the old way of passing them to the function does not scale.
Change-Id: I88e7f2896e0364a41d4538752dad291de83bfbca
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Reviewed-on: https://code.wireshark.org/review/1819
Reviewed-by: Evan Huus <eapache@gmail.com>
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
This moves the keyfile and psk options from the ssl code into ssl-utils
and then uses them also for dtls.
This is the last missing part for bug 9499 from my side.
Change-Id: Ie2fe5bc565eabe1e6ce62498c985b8a36e913b0f
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Reviewed-on: https://code.wireshark.org/review/1369
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Michael Mann <mmann78@netscape.net>
No caller checks its return value (which is always 0).
Change-Id: I18461ee6e5d369722c8c2b2ea1e409423aa5d631
Reviewed-on: https://code.wireshark.org/review/1365
Reviewed-by: Michael Mann <mmann78@netscape.net>
Reviewed-by: Evan Huus <eapache@gmail.com>
This was introduced in the previous compilation fix.
Change-Id: I4ec652a2708d90f35f3f00ec2c3261acb3e68397
Reviewed-on: https://code.wireshark.org/review/1074
Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org>
Tested-by: Stig Bjørlykke <stig@bjorlykke.org>
Also fixed a comment for a #endif for the same defines.
Change-Id: Icbbf619dbaeb1d4d154a5f1a8273f252d35c6981
Reviewed-on: https://code.wireshark.org/review/1070
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
This adds basic detection of Supplemental Data as defined in RFC4680.
Change-Id: I8dac99bf243a6bd176585d1fe70f82abcae70c7f
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Reviewed-on: https://code.wireshark.org/review/967
Reviewed-by: Michael Mann <mmann78@netscape.net>
Change-Id: Ib8779b0db790a78fff8bd1970a7240bbd8f49f75
Reviewed-on: https://code.wireshark.org/review/537
Reviewed-by: Martin Kaiser <wireshark@kaiser.cx>
Tested-by: Martin Kaiser <wireshark@kaiser.cx>
(Using sed : sed -i '/^ \* \$Id\$/,+1 d')
Fix manually some typo (in export_object_dicom.c and crc16-plain.c)
Change-Id: I4c1ae68d1c4afeace8cb195b53c715cf9e1227a8
Reviewed-on: https://code.wireshark.org/review/497
Reviewed-by: Anders Broman <a.broman58@gmail.com>
ssl: move TLS ext dissect code to packet-ssl-utils.c
This moves the code used to parse the TLS extension into packet-
ssl-utils.c and adds an architecture that this code could be used by
dtls in the next patch. This patch should not change anything in the
functionality.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
svn path=/trunk/; revision=54418
DLTS: add cipher version for OpenSSL pre 0.9.8f
OpenSSL pre 0.9.8f uses the TLS version 0x0100 and is not completely
compatible with DTLS 1.0 or 1.2. One difference is that the encrypted
pre master from TLS 1.0 does not have an own length, which is needed by
TLS and DTLS 1.0, this makes decrypting impossible. This patch makes it
possible for the code to distinguish between this OpenSSL version and
real DTLS 1.0, because they are not using the same code any more. This
is needed to fix the snakeoil-dtls test.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
svn path=/trunk/; revision=54043
ssl-utils: remove SIG, rename mode and formatting
The changes seem huge, but actually involve a few structural changes
that do not change functionality, but aim to make maintenance easier and
lines shorter. The following changes were made:
1. Remove the "sig" field and `SIG_*` constants as they are not used
anywhere.
2. Convert `SSL_CIPHER_MODE_*` macros to an enum, change the type in
SslCipherSuite, change the field terminator in cipher_suites and
drop the `SSL_CIPHER_` prefix to make it shorter.
3. Add whitespace to align the cipher suites and convert the numbers to
hex to match common usage (e.g. IANA docs). Done with the awk script
below.
AWK script that takes the lines with `,KEX_` and applies changes (3):
#!/usr/bin/gawk -f
BEGIN { FS="[, {]+" }
{
split($0, c, "}, *");
comment="";if(c[2])comment=" "c[2];
sub("}", "", $10); # comment }
printf(" {0x%04X,%-12s%-16s%2d,%3d,%3d,%-11s %-22s},%s\n",
strtonum($2),
$3 ",", # Key exchange
# $4 is SIG_ - remove
$5 ",", # Cipher
$6, # blocksize
$7, # keysize
$8, # export keysize
$9 ",", # Digest
$10, # mode
comment);
}
Signed-off-by: Peter Wu <lekensteyn@gmail.com>
svn path=/trunk/; revision=54039
From Hauke Mehrtens
1. dtls: set ssl_set_server() in DTLS dissector so wireshark knows if this is client or server
2. SSL: add decrypt support for CCM and CCM_8 Ciphers per rfc 6655
3. dtls: add psk decrypt support
svn path=/trunk/; revision=53836
Add RFC6066 CertificateUrl TLS extension
This is not supported by OpenSSL or NSS, the extension itself seems
unsafe, but some implementations seem to support it[1].
Untested, no capture available.
[1]: http://www.ietf.org/mail-archive/web/tls/current/msg02535.html
svn path=/trunk/; revision=53417
Add status_request_v2 TLS extension dissection (RFC6961)
Besides adding status_request_v2 support, this patch moves the
Certificate Status Type from the OCSP Status subtree to its parent
(the extension tree). This is needed because this type applies to all
OCSPResponse fields.
The check for "tree != NULL" seems unnecessary here, it was not
clarified in the original patch so I removed it.
From me
Fix typo
Remove unneeded tvb_ensure_bytes_exist
Use proto_tree_add_item
svn path=/trunk/; revision=53416
Add TLS StatusRequest (RFC6066) ClientHello extension recognition
Only empty Responder ID lists and empty Request Extensions are
implemented. I could not really find existing clients or servers that
populate these.
This status_request extension has a different signature for a
ClientHello and ServerHello, in the latter the extension_data field
must be empty. Therefore an additional parameter is added to
dissect_ssl3_hnd_hello_ext.
From me :
Fix typo
svn path=/trunk/; revision=53415
Really add support for AEAD ciphers (GCM)
GCM uses counter mode with authentication tags (the latter is currently
not supported). As for the key material, there is no MAC (because the
auth tag is supposed to verify the authenticity).
Finally, correct the GCM cipher suite definitions: IV block size of
4 bytes and GCM instead of CBC mode.
svn path=/trunk/; revision=52150
Use IV from record for CBC mode, add padding/IV length check
Add summary of RFCs to make it more obvious why certain parts (IV, MAC,
padding) are used. Merge DTLS and TLS blocks for extracting IV. This
saves an unnecessary memmove() because the input pointer is, well, just
a local variable and can therefore be incremented.
Validate padding and IV lengths before using it. A crash could occur
if the explicit IV is missing (this would make memmove write before its
buffer). The missing padding check had as implication that a misleading
error is returning with a negative length (not exploitable).
Use IV from record for CBC mode, previously it decrypted the first block
incorrectly and then threw this "decrypted" IV away. Now it extracts the
IV and uses this for decrypting the first fragment block. (remember that
CBC xor's the output of the block cipher with the previous ciphertext
(or IV for the first block)).
This is a preparation for GCM which does not have a MAC. The skip_mac
branch is necessary to make the compiler happy in this patch, 'mac'
could otherwise be uninitialised.
svn path=/trunk/; revision=52149
Drop export_cipher and dig_len, cleaner digest access
Removed dig_len as this magic number is dependent on dig. The digests
variable is converted from a string to a structure holding the digest
name and length because of its close dependency.
Introduce another struct+function to get rid of the magic number 0x40
(DIG_MD5).
Removed export_cipher bit as this is dependent on eff_bits < bits.
Verified with:
grep ,KEX_ packet-ssl-utils.c | awk -F, '{bits=$6!=$7;ex=$9;
if ((bits && !ex) || (!bits && ex))print $6, $7, $8, "###", $0}'.
Removed space before SIG_RSA for cipher 51 for consistency with others.
svn path=/trunk/; revision=52147
Add more TLS cipher suites (SEED, AES-GCM, ECC)
- cipher suites from `RFC 5246 - TLS 1.2`
- cipher suites 150-155 are taken from: RFC 4162 - SEED for TLS
- cipher suites 156-167 are taken from: RFC 5288 - AES-GCM Cipher suites
- cipher suites 49153-49177 are taken from: RFC 4492 - ECC for TLS
- cipher suites 49195-49202 are taken from RFC 5289 - ECC with SHA256/384 and AES GCM
svn path=/trunk/; revision=52049
Dave Tapuska