Doesn't build, rustls-platform-verifier, "the trait bound `webpki::Error: std::error::Error` is not satisfied"

[nikclayton]

Steps To Reproduce

1. Checkout head (a3f9e99 at the time of writing).

2. Install Rust (https://www.rust-lang.org/learn/get-started).

% cargo --version
cargo 1.86.0 (adf9b6ad1 2025-02-28)

3. Try and build bws

% cd crates/bws
% cargo install --path .

Expected Result

Build completes, no errors.

Actual Result

% cd crates/bws
% cargo install --path .
[... lots of compiler output, then this error ...]
   Compiling rustls-platform-verifier v0.3.4
error[E0277]: the trait bound `webpki::Error: std::error::Error` is not satisfied
   --> /home/nik/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rustls-platform-verifier-0.3.4/src/verification/others.rs:234:40
    |
234 |             other_err.0.downcast_ref::<webpki::Error>()
    |                         ------------   ^^^^^^^^^^^^^ the trait `std::error::Error` is not implemented for `webpki::Error`
    |                         |
    |                         required by a bound introduced by this call
    |
note: required by a bound in `<(dyn std::error::Error + Send + Sync + 'static)>::downcast_ref`
   --> /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/error.rs:271:5

For more information about this error, try `rustc --explain E0277`.
error: could not compile `rustls-platform-verifier` (lib) due to 1 previous error

Screenshots or Videos

No response

Additional Context

See rustls/rustls-platform-verifier#164. You probably need to update the rustls-platform-verifier to something newer, probably 0.5.2.

Operating System

Linux

Operating System Version

Ubuntu 24.10

Shell

Bash

Build Version

Commit hash a3f9e99

Issue Tracking Info

• I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.

[guangyu-he]

Hi there,

I'm experiencing the same build error across multiple Linux systems:

• ✗ Debian (x86_64-unknown-linux-gnu)
• ✗ Raspberry Pi 4 (aarch64-unknown-linux-gnu)

However, the build succeeds on:

• ✓ macOS (aarch64-apple-darwin)

This appears to be a Linux-specific compilation issue. Following other discussions among all related threads, I assume:

You probably need to update the rustls-platform-verifier to something newer, probably 0.5.2.

should resolve the problem.

[ifigueroap]

I'm right now trying to install bws and I get the same error:

 Compiling rustls-platform-verifier v0.3.4
error[E0277]: the trait bound `webpki::Error: std::error::Error` is not satisfied
   --> /home/ismael/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rustls-platform-verifier-0.3.4/src/verification/others.rs:234:40
    |
234 |             other_err.0.downcast_ref::<webpki::Error>()
    |                         ------------   ^^^^^^^^^^^^^ the trait `std::error::Error` is not implemented for `webpki::Error`
    |                         |
    |                         required by a bound introduced by this call
    |
note: required by a bound in `<(dyn std::error::Error + Send + Sync + 'static)>::downcast_ref`
   --> /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/error.rs:295:5

For more information about this error, try `rustc --explain E0277`.
error: could not compile `rustls-platform-verifier` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
error: failed to compile `bws v1.0.0`, intermediate artifacts can be found at `/tmp/cargo-install4TvfzC`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.

I'm using rustc 1.87.0 (17067e9ac 2025-05-09) in Windows 11 + WSL2

[oblivisheee]

Guys, I found the way how to fix it. Since bitwarden doesn't update rust crate you can simply add this to Cargo.toml:

rustls-webpki = { version = "0.102", features = ["std"] }

Fixed for me.