[v10.x] http2: mitigate reported DoS attacks #29123
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Multiple general improvements to http2 internals for readability and efficiency [This backport applied to v10.x cleanly.] PR-URL: nodejs#23984 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Trivikram Kamat <[email protected]> Reviewed-By: Ujjwal Sharma <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
[This backport applied to v10.x cleanly.] PR-URL: nodejs#25822 Reviewed-By: Gireesh Punathil <[email protected]>
PR-URL: nodejs#26990 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
PR-URL: nodejs#27295 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Yongsheng Zhang <[email protected]> Reviewed-By: Masashi Hirano <[email protected]>
PR-URL: nodejs#28448 Reviewed-By: Trivikram Kamat <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]>
This includes mitigations for CVE-2019-9512/CVE-2019-9515.
DRY up the `debug()` calls, and in particular, avoid building template strings before we know whether we need to.
For some JS events, it only makes sense to call into JS when there are listeners for the event in question. The overhead is noticeable if a lot of these events are emitted during the lifetime of a session. To reduce this overhead, keep track of whether any/how many JS listeners are present, and if there are none, skip calls into JS altogether. This is part of performance improvements to mitigate CVE-2019-9513.
Lazily allocate `ArrayBuffer`s for the contents of DATA frames. Creating `ArrayBuffer`s is, sadly, not a cheap operation with V8. This is part of performance improvements to mitigate CVE-2019-9513. Together with the previous commit, these changes improve throughput in the adversarial case by about 100 %, and there is little more that we can do besides artificially limiting the rate of incoming metadata frames (i.e. after this patch, CPU usage is virtually exclusively in libnghttp2). [This backport also applies changes from 83e1b97 and required some manual work due to the lack of `AllocatedBuffer` on v10.x.] Refs: nodejs#26201
Limit the number of streams that are rejected upon creation. Since each such rejection is associated with an `NGHTTP2_ENHANCE_YOUR_CALM` error that should tell the peer to not open any more streams, continuing to open streams should be read as a sign of a misbehaving peer. The limit is currently set to 100 but could be changed or made configurable. This is intended to mitigate CVE-2019-9514.
Limit the number of invalid input frames, as they may be pointing towards a misbehaving peer. The limit is currently set to 1000 but could be changed or made configurable. This is intended to mitigate CVE-2019-9514. [This commit differs from the v12.x one due to the lack of libuv/libuv@ee24ce900e5714c950b248da2b. See the comment in the test for more details.]
Ignore headers with 0-length names and track memory for headers the way we track it for other HTTP/2 session memory too. This is intended to mitigate CVE-2019-9516.
Allocating memory upfront comes with overhead, and in particular, `std::vector` implementations do not necessarily return memory to the system when one might expect that (e.g. after shrinking the vector).
This is intended to mitigate CVE-2019-9518.
If a write to the underlying socket finishes asynchronously, that means that we cannot write any more data at that point without waiting for it to finish. If this happens, we should also not be producing any more input. This is part of mitigating CVE-2019-9511/CVE-2019-9517.
If we are waiting for the ability to send more output, we should not process more input. This commit a) makes us send output earlier, during processing of input, if we accumulate a lot and b) allows interrupting the call into nghttp2 that processes input data and resuming it at a later time, if we do find ourselves in a position where we are waiting to be able to send more output. This is part of mitigating CVE-2019-9511/CVE-2019-9517.
nghttp2 has updated its limit for outstanding Ping/Settings ACKs to 1000. This commit allows reverting to the old default of 10000. The associated CVEs are CVE-2019-9512/CVE-2019-9515.
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CI: https://ci.nodejs.org/job/node-test-pull-request/24980/ (:heavy_check_mark:) |
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Multiple general improvements to http2 internals for readability and efficiency [This backport applied to v10.x cleanly.] Backport-PR-URL: #29123 PR-URL: #23984 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Trivikram Kamat <[email protected]> Reviewed-By: Ujjwal Sharma <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
[This backport applied to v10.x cleanly.] Backport-PR-URL: #29123 PR-URL: #25822 Reviewed-By: Gireesh Punathil <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
Backport-PR-URL: #29123 PR-URL: #26990 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
BethGriggs
pushed a commit
that referenced
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Aug 15, 2019
Backport-PR-URL: #29123 PR-URL: #27295 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Yongsheng Zhang <[email protected]> Reviewed-By: Masashi Hirano <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
Backport-PR-URL: #29123 PR-URL: #28448 Reviewed-By: Trivikram Kamat <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
This includes mitigations for CVE-2019-9512/CVE-2019-9515. Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
DRY up the `debug()` calls, and in particular, avoid building template strings before we know whether we need to. Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
For some JS events, it only makes sense to call into JS when there are listeners for the event in question. The overhead is noticeable if a lot of these events are emitted during the lifetime of a session. To reduce this overhead, keep track of whether any/how many JS listeners are present, and if there are none, skip calls into JS altogether. This is part of performance improvements to mitigate CVE-2019-9513. Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
Lazily allocate `ArrayBuffer`s for the contents of DATA frames. Creating `ArrayBuffer`s is, sadly, not a cheap operation with V8. This is part of performance improvements to mitigate CVE-2019-9513. Together with the previous commit, these changes improve throughput in the adversarial case by about 100 %, and there is little more that we can do besides artificially limiting the rate of incoming metadata frames (i.e. after this patch, CPU usage is virtually exclusively in libnghttp2). [This backport also applies changes from 83e1b97 and required some manual work due to the lack of `AllocatedBuffer` on v10.x.] Refs: #26201 Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
Limit the number of streams that are rejected upon creation. Since each such rejection is associated with an `NGHTTP2_ENHANCE_YOUR_CALM` error that should tell the peer to not open any more streams, continuing to open streams should be read as a sign of a misbehaving peer. The limit is currently set to 100 but could be changed or made configurable. This is intended to mitigate CVE-2019-9514. Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
Limit the number of invalid input frames, as they may be pointing towards a misbehaving peer. The limit is currently set to 1000 but could be changed or made configurable. This is intended to mitigate CVE-2019-9514. [This commit differs from the v12.x one due to the lack of libuv/libuv@ee24ce900e5714c950b248da2b. See the comment in the test for more details.] Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
Ignore headers with 0-length names and track memory for headers the way we track it for other HTTP/2 session memory too. This is intended to mitigate CVE-2019-9516. Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
Allocating memory upfront comes with overhead, and in particular, `std::vector` implementations do not necessarily return memory to the system when one might expect that (e.g. after shrinking the vector). Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
This is intended to mitigate CVE-2019-9518. Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
If a write to the underlying socket finishes asynchronously, that means that we cannot write any more data at that point without waiting for it to finish. If this happens, we should also not be producing any more input. This is part of mitigating CVE-2019-9511/CVE-2019-9517. Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
If we are waiting for the ability to send more output, we should not process more input. This commit a) makes us send output earlier, during processing of input, if we accumulate a lot and b) allows interrupting the call into nghttp2 that processes input data and resuming it at a later time, if we do find ourselves in a position where we are waiting to be able to send more output. This is part of mitigating CVE-2019-9511/CVE-2019-9517. Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
nghttp2 has updated its limit for outstanding Ping/Settings ACKs to 1000. This commit allows reverting to the old default of 10000. The associated CVEs are CVE-2019-9512/CVE-2019-9515. Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Aug 15, 2019
Refs: #27914 Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
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See #29122 for the PR against master.