download: statically bundle relevant trust anchors

djc · djc · commit 79ec5003b969 · 2025-12-08T12:07:11.000+01:00
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -140,6 +140,9 @@ http-body-util = "0.1.0"
 hyper = { version = "1.0", default-features = false, features = ["server", "http1"] }
 hyper-util = { version = "0.1.1", features = ["tokio"] }
 proptest = "1.1.0"
+rustls-webpki = { version = "0.103.3" }
+tokio-rustls = "0.26.4"
+webpki-root-certs = "1"
 
 [build-dependencies]
 platforms = "3.4"
diff --git a/src/anchors.rs b/src/anchors.rs
@@ -0,0 +1,125 @@
+// @generated by tests/static_roots.rs
+use rustls::pki_types::CertificateDer;
+
+pub(crate) const RUSTUP_TRUST_ANCHORS: &[CertificateDer<'static>] = &[
+    // Root for host: fastly-static.rust-lang.org
+    CertificateDer::from_slice(&[
+        0x30, 0x82, 0x03, 0x5f, 0x30, 0x82, 0x02, 0x47, 0xa0, 0x03, 0x02, 0x01, 0x02, 0x02, 0x0b,
+        0x04, 0x00, 0x00, 0x00, 0x00, 0x01, 0x21, 0x58, 0x53, 0x08, 0xa2, 0x30, 0x0d, 0x06, 0x09,
+        0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x0b, 0x05, 0x00, 0x30, 0x4c, 0x31, 0x20,
+        0x30, 0x1e, 0x06, 0x03, 0x55, 0x04, 0x0b, 0x13, 0x17, 0x47, 0x6c, 0x6f, 0x62, 0x61, 0x6c,
+        0x53, 0x69, 0x67, 0x6e, 0x20, 0x52, 0x6f, 0x6f, 0x74, 0x20, 0x43, 0x41, 0x20, 0x2d, 0x20,
+        0x52, 0x33, 0x31, 0x13, 0x30, 0x11, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x13, 0x0a, 0x47, 0x6c,
+        0x6f, 0x62, 0x61, 0x6c, 0x53, 0x69, 0x67, 0x6e, 0x31, 0x13, 0x30, 0x11, 0x06, 0x03, 0x55,
+        0x04, 0x03, 0x13, 0x0a, 0x47, 0x6c, 0x6f, 0x62, 0x61, 0x6c, 0x53, 0x69, 0x67, 0x6e, 0x30,
+        0x1e, 0x17, 0x0d, 0x30, 0x39, 0x30, 0x33, 0x31, 0x38, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30,
+        0x5a, 0x17, 0x0d, 0x32, 0x39, 0x30, 0x33, 0x31, 0x38, 0x31, 0x30, 0x30, 0x30, 0x30, 0x30,
+        0x5a, 0x30, 0x4c, 0x31, 0x20, 0x30, 0x1e, 0x06, 0x03, 0x55, 0x04, 0x0b, 0x13, 0x17, 0x47,
+        0x6c, 0x6f, 0x62, 0x61, 0x6c, 0x53, 0x69, 0x67, 0x6e, 0x20, 0x52, 0x6f, 0x6f, 0x74, 0x20,
+        0x43, 0x41, 0x20, 0x2d, 0x20, 0x52, 0x33, 0x31, 0x13, 0x30, 0x11, 0x06, 0x03, 0x55, 0x04,
+        0x0a, 0x13, 0x0a, 0x47, 0x6c, 0x6f, 0x62, 0x61, 0x6c, 0x53, 0x69, 0x67, 0x6e, 0x31, 0x13,
+        0x30, 0x11, 0x06, 0x03, 0x55, 0x04, 0x03, 0x13, 0x0a, 0x47, 0x6c, 0x6f, 0x62, 0x61, 0x6c,
+        0x53, 0x69, 0x67, 0x6e, 0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48,
+        0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0f, 0x00, 0x30, 0x82,
+        0x01, 0x0a, 0x02, 0x82, 0x01, 0x01, 0x00, 0xcc, 0x25, 0x76, 0x90, 0x79, 0x06, 0x78, 0x22,
+        0x16, 0xf5, 0xc0, 0x83, 0xb6, 0x84, 0xca, 0x28, 0x9e, 0xfd, 0x05, 0x76, 0x11, 0xc5, 0xad,
+        0x88, 0x72, 0xfc, 0x46, 0x02, 0x43, 0xc7, 0xb2, 0x8a, 0x9d, 0x04, 0x5f, 0x24, 0xcb, 0x2e,
+        0x4b, 0xe1, 0x60, 0x82, 0x46, 0xe1, 0x52, 0xab, 0x0c, 0x81, 0x47, 0x70, 0x6c, 0xdd, 0x64,
+        0xd1, 0xeb, 0xf5, 0x2c, 0xa3, 0x0f, 0x82, 0x3d, 0x0c, 0x2b, 0xae, 0x97, 0xd7, 0xb6, 0x14,
+        0x86, 0x10, 0x79, 0xbb, 0x3b, 0x13, 0x80, 0x77, 0x8c, 0x08, 0xe1, 0x49, 0xd2, 0x6a, 0x62,
+        0x2f, 0x1f, 0x5e, 0xfa, 0x96, 0x68, 0xdf, 0x89, 0x27, 0x95, 0x38, 0x9f, 0x06, 0xd7, 0x3e,
+        0xc9, 0xcb, 0x26, 0x59, 0x0d, 0x73, 0xde, 0xb0, 0xc8, 0xe9, 0x26, 0x0e, 0x83, 0x15, 0xc6,
+        0xef, 0x5b, 0x8b, 0xd2, 0x04, 0x60, 0xca, 0x49, 0xa6, 0x28, 0xf6, 0x69, 0x3b, 0xf6, 0xcb,
+        0xc8, 0x28, 0x91, 0xe5, 0x9d, 0x8a, 0x61, 0x57, 0x37, 0xac, 0x74, 0x14, 0xdc, 0x74, 0xe0,
+        0x3a, 0xee, 0x72, 0x2f, 0x2e, 0x9c, 0xfb, 0xd0, 0xbb, 0xbf, 0xf5, 0x3d, 0x00, 0xe1, 0x06,
+        0x33, 0xe8, 0x82, 0x2b, 0xae, 0x53, 0xa6, 0x3a, 0x16, 0x73, 0x8c, 0xdd, 0x41, 0x0e, 0x20,
+        0x3a, 0xc0, 0xb4, 0xa7, 0xa1, 0xe9, 0xb2, 0x4f, 0x90, 0x2e, 0x32, 0x60, 0xe9, 0x57, 0xcb,
+        0xb9, 0x04, 0x92, 0x68, 0x68, 0xe5, 0x38, 0x26, 0x60, 0x75, 0xb2, 0x9f, 0x77, 0xff, 0x91,
+        0x14, 0xef, 0xae, 0x20, 0x49, 0xfc, 0xad, 0x40, 0x15, 0x48, 0xd1, 0x02, 0x31, 0x61, 0x19,
+        0x5e, 0xb8, 0x97, 0xef, 0xad, 0x77, 0xb7, 0x64, 0x9a, 0x7a, 0xbf, 0x5f, 0xc1, 0x13, 0xef,
+        0x9b, 0x62, 0xfb, 0x0d, 0x6c, 0xe0, 0x54, 0x69, 0x16, 0xa9, 0x03, 0xda, 0x6e, 0xe9, 0x83,
+        0x93, 0x71, 0x76, 0xc6, 0x69, 0x85, 0x82, 0x17, 0x02, 0x03, 0x01, 0x00, 0x01, 0xa3, 0x42,
+        0x30, 0x40, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x1d, 0x0f, 0x01, 0x01, 0xff, 0x04, 0x04, 0x03,
+        0x02, 0x01, 0x06, 0x30, 0x0f, 0x06, 0x03, 0x55, 0x1d, 0x13, 0x01, 0x01, 0xff, 0x04, 0x05,
+        0x30, 0x03, 0x01, 0x01, 0xff, 0x30, 0x1d, 0x06, 0x03, 0x55, 0x1d, 0x0e, 0x04, 0x16, 0x04,
+        0x14, 0x8f, 0xf0, 0x4b, 0x7f, 0xa8, 0x2e, 0x45, 0x24, 0xae, 0x4d, 0x50, 0xfa, 0x63, 0x9a,
+        0x8b, 0xde, 0xe2, 0xdd, 0x1b, 0xbc, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7,
+        0x0d, 0x01, 0x01, 0x0b, 0x05, 0x00, 0x03, 0x82, 0x01, 0x01, 0x00, 0x4b, 0x40, 0xdb, 0xc0,
+        0x50, 0xaa, 0xfe, 0xc8, 0x0c, 0xef, 0xf7, 0x96, 0x54, 0x45, 0x49, 0xbb, 0x96, 0x00, 0x09,
+        0x41, 0xac, 0xb3, 0x13, 0x86, 0x86, 0x28, 0x07, 0x33, 0xca, 0x6b, 0xe6, 0x74, 0xb9, 0xba,
+        0x00, 0x2d, 0xae, 0xa4, 0x0a, 0xd3, 0xf5, 0xf1, 0xf1, 0x0f, 0x8a, 0xbf, 0x73, 0x67, 0x4a,
+        0x83, 0xc7, 0x44, 0x7b, 0x78, 0xe0, 0xaf, 0x6e, 0x6c, 0x6f, 0x03, 0x29, 0x8e, 0x33, 0x39,
+        0x45, 0xc3, 0x8e, 0xe4, 0xb9, 0x57, 0x6c, 0xaa, 0xfc, 0x12, 0x96, 0xec, 0x53, 0xc6, 0x2d,
+        0xe4, 0x24, 0x6c, 0xb9, 0x94, 0x63, 0xfb, 0xdc, 0x53, 0x68, 0x67, 0x56, 0x3e, 0x83, 0xb8,
+        0xcf, 0x35, 0x21, 0xc3, 0xc9, 0x68, 0xfe, 0xce, 0xda, 0xc2, 0x53, 0xaa, 0xcc, 0x90, 0x8a,
+        0xe9, 0xf0, 0x5d, 0x46, 0x8c, 0x95, 0xdd, 0x7a, 0x58, 0x28, 0x1a, 0x2f, 0x1d, 0xde, 0xcd,
+        0x00, 0x37, 0x41, 0x8f, 0xed, 0x44, 0x6d, 0xd7, 0x53, 0x28, 0x97, 0x7e, 0xf3, 0x67, 0x04,
+        0x1e, 0x15, 0xd7, 0x8a, 0x96, 0xb4, 0xd3, 0xde, 0x4c, 0x27, 0xa4, 0x4c, 0x1b, 0x73, 0x73,
+        0x76, 0xf4, 0x17, 0x99, 0xc2, 0x1f, 0x7a, 0x0e, 0xe3, 0x2d, 0x08, 0xad, 0x0a, 0x1c, 0x2c,
+        0xff, 0x3c, 0xab, 0x55, 0x0e, 0x0f, 0x91, 0x7e, 0x36, 0xeb, 0xc3, 0x57, 0x49, 0xbe, 0xe1,
+        0x2e, 0x2d, 0x7c, 0x60, 0x8b, 0xc3, 0x41, 0x51, 0x13, 0x23, 0x9d, 0xce, 0xf7, 0x32, 0x6b,
+        0x94, 0x01, 0xa8, 0x99, 0xe7, 0x2c, 0x33, 0x1f, 0x3a, 0x3b, 0x25, 0xd2, 0x86, 0x40, 0xce,
+        0x3b, 0x2c, 0x86, 0x78, 0xc9, 0x61, 0x2f, 0x14, 0xba, 0xee, 0xdb, 0x55, 0x6f, 0xdf, 0x84,
+        0xee, 0x05, 0x09, 0x4d, 0xbd, 0x28, 0xd8, 0x72, 0xce, 0xd3, 0x62, 0x50, 0x65, 0x1e, 0xeb,
+        0x92, 0x97, 0x83, 0x31, 0xd9, 0xb3, 0xb5, 0xca, 0x47, 0x58, 0x3f, 0x5f,
+    ]),
+    // Root for host: cloudfront-static.rust-lang.org
+    CertificateDer::from_slice(&[
+        0x30, 0x82, 0x03, 0x41, 0x30, 0x82, 0x02, 0x29, 0xa0, 0x03, 0x02, 0x01, 0x02, 0x02, 0x13,
+        0x06, 0x6c, 0x9f, 0xcf, 0x99, 0xbf, 0x8c, 0x0a, 0x39, 0xe2, 0xf0, 0x78, 0x8a, 0x43, 0xe6,
+        0x96, 0x36, 0x5b, 0xca, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01,
+        0x01, 0x0b, 0x05, 0x00, 0x30, 0x39, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06,
+        0x13, 0x02, 0x55, 0x53, 0x31, 0x0f, 0x30, 0x0d, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x13, 0x06,
+        0x41, 0x6d, 0x61, 0x7a, 0x6f, 0x6e, 0x31, 0x19, 0x30, 0x17, 0x06, 0x03, 0x55, 0x04, 0x03,
+        0x13, 0x10, 0x41, 0x6d, 0x61, 0x7a, 0x6f, 0x6e, 0x20, 0x52, 0x6f, 0x6f, 0x74, 0x20, 0x43,
+        0x41, 0x20, 0x31, 0x30, 0x1e, 0x17, 0x0d, 0x31, 0x35, 0x30, 0x35, 0x32, 0x36, 0x30, 0x30,
+        0x30, 0x30, 0x30, 0x30, 0x5a, 0x17, 0x0d, 0x33, 0x38, 0x30, 0x31, 0x31, 0x37, 0x30, 0x30,
+        0x30, 0x30, 0x30, 0x30, 0x5a, 0x30, 0x39, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04,
+        0x06, 0x13, 0x02, 0x55, 0x53, 0x31, 0x0f, 0x30, 0x0d, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x13,
+        0x06, 0x41, 0x6d, 0x61, 0x7a, 0x6f, 0x6e, 0x31, 0x19, 0x30, 0x17, 0x06, 0x03, 0x55, 0x04,
+        0x03, 0x13, 0x10, 0x41, 0x6d, 0x61, 0x7a, 0x6f, 0x6e, 0x20, 0x52, 0x6f, 0x6f, 0x74, 0x20,
+        0x43, 0x41, 0x20, 0x31, 0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48,
+        0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0f, 0x00, 0x30, 0x82,
+        0x01, 0x0a, 0x02, 0x82, 0x01, 0x01, 0x00, 0xb2, 0x78, 0x80, 0x71, 0xca, 0x78, 0xd5, 0xe3,
+        0x71, 0xaf, 0x47, 0x80, 0x50, 0x74, 0x7d, 0x6e, 0xd8, 0xd7, 0x88, 0x76, 0xf4, 0x99, 0x68,
+        0xf7, 0x58, 0x21, 0x60, 0xf9, 0x74, 0x84, 0x01, 0x2f, 0xac, 0x02, 0x2d, 0x86, 0xd3, 0xa0,
+        0x43, 0x7a, 0x4e, 0xb2, 0xa4, 0xd0, 0x36, 0xba, 0x01, 0xbe, 0x8d, 0xdb, 0x48, 0xc8, 0x07,
+        0x17, 0x36, 0x4c, 0xf4, 0xee, 0x88, 0x23, 0xc7, 0x3e, 0xeb, 0x37, 0xf5, 0xb5, 0x19, 0xf8,
+        0x49, 0x68, 0xb0, 0xde, 0xd7, 0xb9, 0x76, 0x38, 0x1d, 0x61, 0x9e, 0xa4, 0xfe, 0x82, 0x36,
+        0xa5, 0xe5, 0x4a, 0x56, 0xe4, 0x45, 0xe1, 0xf9, 0xfd, 0xb4, 0x16, 0xfa, 0x74, 0xda, 0x9c,
+        0x9b, 0x35, 0x39, 0x2f, 0xfa, 0xb0, 0x20, 0x50, 0x06, 0x6c, 0x7a, 0xd0, 0x80, 0xb2, 0xa6,
+        0xf9, 0xaf, 0xec, 0x47, 0x19, 0x8f, 0x50, 0x38, 0x07, 0xdc, 0xa2, 0x87, 0x39, 0x58, 0xf8,
+        0xba, 0xd5, 0xa9, 0xf9, 0x48, 0x67, 0x30, 0x96, 0xee, 0x94, 0x78, 0x5e, 0x6f, 0x89, 0xa3,
+        0x51, 0xc0, 0x30, 0x86, 0x66, 0xa1, 0x45, 0x66, 0xba, 0x54, 0xeb, 0xa3, 0xc3, 0x91, 0xf9,
+        0x48, 0xdc, 0xff, 0xd1, 0xe8, 0x30, 0x2d, 0x7d, 0x2d, 0x74, 0x70, 0x35, 0xd7, 0x88, 0x24,
+        0xf7, 0x9e, 0xc4, 0x59, 0x6e, 0xbb, 0x73, 0x87, 0x17, 0xf2, 0x32, 0x46, 0x28, 0xb8, 0x43,
+        0xfa, 0xb7, 0x1d, 0xaa, 0xca, 0xb4, 0xf2, 0x9f, 0x24, 0x0e, 0x2d, 0x4b, 0xf7, 0x71, 0x5c,
+        0x5e, 0x69, 0xff, 0xea, 0x95, 0x02, 0xcb, 0x38, 0x8a, 0xae, 0x50, 0x38, 0x6f, 0xdb, 0xfb,
+        0x2d, 0x62, 0x1b, 0xc5, 0xc7, 0x1e, 0x54, 0xe1, 0x77, 0xe0, 0x67, 0xc8, 0x0f, 0x9c, 0x87,
+        0x23, 0xd6, 0x3f, 0x40, 0x20, 0x7f, 0x20, 0x80, 0xc4, 0x80, 0x4c, 0x3e, 0x3b, 0x24, 0x26,
+        0x8e, 0x04, 0xae, 0x6c, 0x9a, 0xc8, 0xaa, 0x0d, 0x02, 0x03, 0x01, 0x00, 0x01, 0xa3, 0x42,
+        0x30, 0x40, 0x30, 0x0f, 0x06, 0x03, 0x55, 0x1d, 0x13, 0x01, 0x01, 0xff, 0x04, 0x05, 0x30,
+        0x03, 0x01, 0x01, 0xff, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x1d, 0x0f, 0x01, 0x01, 0xff, 0x04,
+        0x04, 0x03, 0x02, 0x01, 0x86, 0x30, 0x1d, 0x06, 0x03, 0x55, 0x1d, 0x0e, 0x04, 0x16, 0x04,
+        0x14, 0x84, 0x18, 0xcc, 0x85, 0x34, 0xec, 0xbc, 0x0c, 0x94, 0x94, 0x2e, 0x08, 0x59, 0x9c,
+        0xc7, 0xb2, 0x10, 0x4e, 0x0a, 0x08, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7,
+        0x0d, 0x01, 0x01, 0x0b, 0x05, 0x00, 0x03, 0x82, 0x01, 0x01, 0x00, 0x98, 0xf2, 0x37, 0x5a,
+        0x41, 0x90, 0xa1, 0x1a, 0xc5, 0x76, 0x51, 0x28, 0x20, 0x36, 0x23, 0x0e, 0xae, 0xe6, 0x28,
+        0xbb, 0xaa, 0xf8, 0x94, 0xae, 0x48, 0xa4, 0x30, 0x7f, 0x1b, 0xfc, 0x24, 0x8d, 0x4b, 0xb4,
+        0xc8, 0xa1, 0x97, 0xf6, 0xb6, 0xf1, 0x7a, 0x70, 0xc8, 0x53, 0x93, 0xcc, 0x08, 0x28, 0xe3,
+        0x98, 0x25, 0xcf, 0x23, 0xa4, 0xf9, 0xde, 0x21, 0xd3, 0x7c, 0x85, 0x09, 0xad, 0x4e, 0x9a,
+        0x75, 0x3a, 0xc2, 0x0b, 0x6a, 0x89, 0x78, 0x76, 0x44, 0x47, 0x18, 0x65, 0x6c, 0x8d, 0x41,
+        0x8e, 0x3b, 0x7f, 0x9a, 0xcb, 0xf4, 0xb5, 0xa7, 0x50, 0xd7, 0x05, 0x2c, 0x37, 0xe8, 0x03,
+        0x4b, 0xad, 0xe9, 0x61, 0xa0, 0x02, 0x6e, 0xf5, 0xf2, 0xf0, 0xc5, 0xb2, 0xed, 0x5b, 0xb7,
+        0xdc, 0xfa, 0x94, 0x5c, 0x77, 0x9e, 0x13, 0xa5, 0x7f, 0x52, 0xad, 0x95, 0xf2, 0xf8, 0x93,
+        0x3b, 0xde, 0x8b, 0x5c, 0x5b, 0xca, 0x5a, 0x52, 0x5b, 0x60, 0xaf, 0x14, 0xf7, 0x4b, 0xef,
+        0xa3, 0xfb, 0x9f, 0x40, 0x95, 0x6d, 0x31, 0x54, 0xfc, 0x42, 0xd3, 0xc7, 0x46, 0x1f, 0x23,
+        0xad, 0xd9, 0x0f, 0x48, 0x70, 0x9a, 0xd9, 0x75, 0x78, 0x71, 0xd1, 0x72, 0x43, 0x34, 0x75,
+        0x6e, 0x57, 0x59, 0xc2, 0x02, 0x5c, 0x26, 0x60, 0x29, 0xcf, 0x23, 0x19, 0x16, 0x8e, 0x88,
+        0x43, 0xa5, 0xd4, 0xe4, 0xcb, 0x08, 0xfb, 0x23, 0x11, 0x43, 0xe8, 0x43, 0x29, 0x72, 0x62,
+        0xa1, 0xa9, 0x5d, 0x5e, 0x08, 0xd4, 0x90, 0xae, 0xb8, 0xd8, 0xce, 0x14, 0xc2, 0xd0, 0x55,
+        0xf2, 0x86, 0xf6, 0xc4, 0x93, 0x43, 0x77, 0x66, 0x61, 0xc0, 0xb9, 0xe8, 0x41, 0xd7, 0x97,
+        0x78, 0x60, 0x03, 0x6e, 0x4a, 0x72, 0xae, 0xa5, 0xd1, 0x7d, 0xba, 0x10, 0x9e, 0x86, 0x6c,
+        0x1b, 0x8a, 0xb9, 0x59, 0x33, 0xf8, 0xeb, 0xc4, 0x90, 0xbe, 0xf1, 0xb9,
+    ]),
+];
diff --git a/src/download/mod.rs b/src/download/mod.rs
@@ -546,12 +546,14 @@ mod reqwest_be {
     use std::sync::{Arc, OnceLock};
     use std::time::Duration;
 
+    #[cfg(feature = "reqwest-rustls-tls")]
+    use crate::anchors::RUSTUP_TRUST_ANCHORS;
     use anyhow::{Context, anyhow};
     use reqwest::{Client, ClientBuilder, Proxy, Response, header};
     #[cfg(feature = "reqwest-rustls-tls")]
     use rustls::crypto::aws_lc_rs;
     #[cfg(feature = "reqwest-rustls-tls")]
-    use rustls_platform_verifier::BuilderVerifierExt;
+    use rustls_platform_verifier::Verifier;
     use tokio_stream::StreamExt;
     use url::Url;
 
@@ -607,15 +609,19 @@ mod reqwest_be {
             return Ok(client);
         }
 
-        let mut tls_config =
-            rustls::ClientConfig::builder_with_provider(Arc::new(aws_lc_rs::default_provider()))
-                .with_safe_default_protocol_versions()
-                .unwrap()
-                .with_platform_verifier()
+        let provider = Arc::new(aws_lc_rs::default_provider());
+        let verifier =
+            Verifier::new_with_extra_roots(RUSTUP_TRUST_ANCHORS.iter().cloned(), provider.clone())
                 .map_err(|err| {
                     DownloadError::Message(format!("failed to initialize platform verifier: {err}"))
-                })?
-                .with_no_client_auth();
+                })?;
+
+        let mut tls_config = rustls::ClientConfig::builder_with_provider(provider)
+            .with_safe_default_protocol_versions()
+            .unwrap()
+            .dangerous() // We're using a rustls verifier, so it's okay
+            .with_custom_certificate_verifier(Arc::new(verifier))
+            .with_no_client_auth();
         tls_config.alpn_protocols = vec![b"h2".to_vec(), b"http/1.1".to_vec()];
 
         let client = client_generic()
diff --git a/src/lib.rs b/src/lib.rs
@@ -70,6 +70,8 @@ fn component_for_bin(binary: &str) -> Option<&'static str> {
 
 #[macro_use]
 pub mod cli;
+#[cfg(feature = "reqwest-rustls-tls")]
+mod anchors;
 mod command;
 mod config;
 mod diskio;
diff --git a/tests/suite/mod.rs b/tests/suite/mod.rs
@@ -10,3 +10,4 @@ mod cli_v1;
 mod cli_v2;
 mod dist_install;
 mod known_triples;
+mod static_roots;
diff --git a/tests/suite/static_roots.rs b/tests/suite/static_roots.rs
@@ -0,0 +1,176 @@
+//! Connects to a known set of `HOSTS`, captures the root certificates for the
+//! certificate chain presented, and writes them to `src/anchors.rs` in a way
+//! that is easy to consume for use as `extra_roots` in rustls-platform-verifier.
+
+use std::{
+    fs,
+    sync::{Arc, Mutex},
+};
+
+use rustls::{
+    DigitallySignedStruct, Error, RootCertStore, SignatureScheme,
+    client::{
+        WebPkiServerVerifier,
+        danger::{HandshakeSignatureValid, ServerCertVerified, ServerCertVerifier},
+    },
+    crypto::{CryptoProvider, aws_lc_rs},
+    pki_types::{CertificateDer, ServerName, TrustAnchor, UnixTime},
+};
+use tempfile::NamedTempFile;
+use tokio::net::TcpStream;
+use tokio_rustls::TlsConnector;
+use webpki::{EndEntityCert, anchor_from_trusted_cert};
+use webpki_root_certs::TLS_SERVER_ROOT_CERTS;
+
+#[tokio::test]
+async fn store_static_roots() {
+    let provider = Arc::new(aws_lc_rs::default_provider());
+    let mut root_store = RootCertStore::empty();
+    let mut roots = Vec::with_capacity(TLS_SERVER_ROOT_CERTS.len());
+    for cert_der in TLS_SERVER_ROOT_CERTS {
+        let ta = anchor_from_trusted_cert(cert_der).unwrap();
+        roots.push((cert_der, ta.clone()));
+        root_store.roots.push(ta);
+    }
+
+    let root_store = Arc::new(root_store);
+    let inner = WebPkiServerVerifier::builder_with_provider(root_store.clone(), provider.clone())
+        .build()
+        .unwrap();
+
+    let verifier = Arc::new(TrackRootVerifier {
+        root: Mutex::default(),
+        roots: root_store,
+        inner,
+        provider: provider.clone(),
+    });
+
+    let config = Arc::new(
+        rustls::ClientConfig::builder_with_provider(provider)
+            .with_safe_default_protocol_versions()
+            .unwrap()
+            .dangerous()
+            .with_custom_certificate_verifier(verifier.clone())
+            .with_no_client_auth(),
+    );
+
+    let mut code = "// @generated by tests/static_roots.rs\n".to_string();
+    code.push_str("use rustls::pki_types::CertificateDer;\n\n");
+    code.push_str("pub(crate) const RUSTUP_TRUST_ANCHORS: &[CertificateDer<'static>] = &[\n");
+    let connector = TlsConnector::from(config);
+    for &host in HOSTS {
+        connector
+            .connect(
+                ServerName::try_from(host).unwrap(),
+                TcpStream::connect((host, 443)).await.unwrap(),
+            )
+            .await
+            .unwrap();
+
+        let root = verifier.root.lock().unwrap().take().unwrap();
+        let root_cert = roots
+            .iter()
+            .find_map(|(cert_der, ta)| (ta == &root).then_some(*cert_der))
+            .unwrap();
+
+        code.push_str(&format!("    // Root for host: {host}\n"));
+        code.push_str(&format!("    CertificateDer::from_slice(&[\n"));
+        for chunk in root_cert.chunks(15) {
+            code.push_str("        ");
+            for (i, byte) in chunk.iter().enumerate() {
+                if i > 0 {
+                    code.push(' ');
+                }
+                code.push_str(&format!("0x{:02x},", byte));
+            }
+            code.push_str("\n");
+        }
+        code.push_str("    ]),\n");
+    }
+    code.push_str("];\n");
+
+    let tmp = NamedTempFile::new().unwrap();
+    fs::write(&tmp, &code).unwrap();
+    let new = fs::read_to_string(&tmp).unwrap();
+
+    let old = fs::read_to_string(PATH).unwrap();
+    if old != new {
+        fs::rename(tmp.path(), PATH).unwrap();
+        panic!("anchors.rs is outdated; updated it");
+    }
+}
+
+const PATH: &str = "src/anchors.rs";
+
+#[derive(Debug)]
+struct TrackRootVerifier {
+    root: Mutex<Option<TrustAnchor<'static>>>,
+    inner: Arc<WebPkiServerVerifier>,
+    roots: Arc<RootCertStore>,
+    provider: Arc<CryptoProvider>,
+}
+
+impl ServerCertVerifier for TrackRootVerifier {
+    fn verify_server_cert(
+        &self,
+        end_entity: &CertificateDer<'_>,
+        intermediates: &[CertificateDer<'_>],
+        server_name: &ServerName<'_>,
+        ocsp_response: &[u8],
+        now: UnixTime,
+    ) -> Result<ServerCertVerified, Error> {
+        let verified = self.inner.verify_server_cert(
+            end_entity,
+            intermediates,
+            server_name,
+            ocsp_response,
+            now,
+        )?;
+
+        let cert = EndEntityCert::try_from(end_entity)
+            .map_err(|e| Error::General(format!("invalid end entity certificate: {e}")))?;
+
+        let path = cert
+            .verify_for_usage(
+                &self.provider.signature_verification_algorithms.all,
+                &self.roots.roots,
+                intermediates,
+                now,
+                webpki::KeyUsage::server_auth(),
+                None,
+                None,
+            )
+            .unwrap();
+
+        let mut root = self.root.lock().unwrap();
+        *root = Some(path.anchor().to_owned());
+        Ok(verified)
+    }
+
+    fn verify_tls12_signature(
+        &self,
+        message: &[u8],
+        cert: &CertificateDer<'_>,
+        dss: &DigitallySignedStruct,
+    ) -> Result<HandshakeSignatureValid, Error> {
+        self.inner.verify_tls12_signature(message, cert, dss)
+    }
+
+    fn verify_tls13_signature(
+        &self,
+        message: &[u8],
+        cert: &CertificateDer<'_>,
+        dss: &DigitallySignedStruct,
+    ) -> Result<HandshakeSignatureValid, Error> {
+        self.inner.verify_tls13_signature(message, cert, dss)
+    }
+
+    fn supported_verify_schemes(&self) -> Vec<SignatureScheme> {
+        self.inner.supported_verify_schemes()
+    }
+}
+
+const HOSTS: &[&str] = &[
+    "fastly-static.rust-lang.org",
+    "cloudfront-static.rust-lang.org",
+];
