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Harden gvfs-helper to validate the packfiles in a multipart prefetch response #571

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jeffhostetler
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Teach gvfs-helper to ignore the optional .idx files that may be included in a prefetch response and always use git index-pack to create them from the .pack files received in the data stream.

This is a little wasteful in terms of client-side compute and of the network bandwidth, but allows us to use the full packfile verification code contained within git index-pack to ensure that the received packfiles are valid.

@jeffhostetler jeffhostetler self-assigned this Apr 13, 2023
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@derrickstolee derrickstolee left a comment

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Thanks for identifying and hardening this part of the code!

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@vdye vdye left a comment

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This looks great! I noted a few minor nits, but they're insignificant enough that I'm content with it merging as-is.

Add "mayhem" keys to generate corrupt packfiles and/or corrupt idx
files in prefetch by trashing the trailing checksum SHA.

Add unit tests to t5799 to verify that `gvfs-helper` detects these
corrupt pack/idx files.

Currently, only the (bad-pack, no-idx) case is correctly detected,
Because `gvfs-helper` needs to locally compute the idx file itself.

A test for the (bad-pack, any-idx) case was also added (as a known
breakage) because `gvfs-helper` assumes that when the cache server
provides both, it doesn't need to verify them.  We will fix that
assumption in the next commit.

Signed-off-by: Jeff Hostetler <[email protected]>
The GVFS cache server can return multiple pairs of (.pack, .idx)
files.  If both are provided, `gvfs-helper` assumes that they are
valid without any validation.  This might cause problems if the
.pack file is corrupt inside the data stream.  (This might happen
if the cache server sends extra unexpected STDERR data or if the
.pack file is corrupt on the cache server's disk.)

All of the .pack file verification logic is already contained
within `git index-pack`, so let's ignore the .idx from the data
stream and force compute it.

This defeats the purpose of some of the data cacheing on the cache
server, but safety is more important.

Signed-off-by: Jeff Hostetler <[email protected]>
@jeffhostetler jeffhostetler force-pushed the jeffhostetler/harden-gvfs-helper branch from fc36c07 to 3fca5ba Compare April 17, 2023 15:34
@jeffhostetler jeffhostetler enabled auto-merge April 17, 2023 15:41
@jeffhostetler jeffhostetler merged commit 322ea4d into microsoft:vfs-2.40.0 Apr 17, 2023
@jeffhostetler jeffhostetler deleted the jeffhostetler/harden-gvfs-helper branch April 17, 2023 17:28
derrickstolee pushed a commit that referenced this pull request Apr 25, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
vdye pushed a commit that referenced this pull request May 17, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
vdye pushed a commit that referenced this pull request May 17, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
vdye pushed a commit that referenced this pull request May 17, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
vdye pushed a commit that referenced this pull request May 20, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
vdye pushed a commit that referenced this pull request May 25, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
vdye pushed a commit that referenced this pull request Jun 1, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jul 7, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
vdye pushed a commit that referenced this pull request Jul 19, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Aug 8, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Aug 8, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Aug 11, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
jeffhostetler added a commit that referenced this pull request Aug 23, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Nov 3, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Nov 3, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Nov 3, 2023
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Apr 23, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Apr 23, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Apr 23, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Apr 24, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Apr 29, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request May 14, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request May 14, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jun 3, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jul 17, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jul 17, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jul 17, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jul 18, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
mjcheetham pushed a commit that referenced this pull request Jul 23, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jul 25, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
mjcheetham pushed a commit that referenced this pull request Jul 29, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Sep 18, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Sep 24, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Oct 8, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
mjcheetham pushed a commit that referenced this pull request Dec 3, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Dec 17, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Dec 18, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Dec 18, 2024
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jan 1, 2025
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jan 1, 2025
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jan 1, 2025
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jan 1, 2025
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Jan 1, 2025
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
dscho pushed a commit that referenced this pull request Feb 10, 2025
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
@dscho dscho mentioned this pull request Feb 10, 2025
dscho pushed a commit that referenced this pull request Feb 27, 2025
…response (#571)

Teach `gvfs-helper` to ignore the optional `.idx` files that may be
included in a `prefetch` response and always use `git index-pack` to
create them from the `.pack` files received in the data stream.

This is a little wasteful in terms of client-side compute and of the
network bandwidth, but allows us to use the full packfile verification
code contained within `git index-pack` to ensure that the received
packfiles are valid.
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3 participants