Fix: Harden installer provenance boundary

setup/lib/artifact-provenance

@@ -6,15 +6,27 @@
 
 declare -gA INSTALLER_PROVENANCE=()
 
+_primary_key_fingerprints() {
+    gpg --batch --with-colons --import-options show-only --import "$1" 2>/dev/null \
+        | awk -F: '$1 == "pub" { primary = 1; next } primary && $1 == "fpr" { print $10; primary = 0 }'
+}
+
 key_fingerprint_matches() {
-    local file="$1" expected="$2" actual
+    local file="$1" expected="$2"
-    actual="$(gpg --batch --with-colons --import-options show-only --import "$file" 2>/dev/null \
+    local -a primary_fingerprints=()
-        | awk -F: '$1 == "fpr" { print $10; exit }')"
+    mapfile -t primary_fingerprints < <(_primary_key_fingerprints "$file")
-    [[ "$actual" == "$expected" ]]
+    [[ ${#primary_fingerprints[@]} -eq 1 && "${primary_fingerprints[0]}" == "$expected" ]]
+}
+
+_key_has_one_primary() {
+    local -a primary_fingerprints=()
+    mapfile -t primary_fingerprints < <(_primary_key_fingerprints "$1")
+    [[ ${#primary_fingerprints[@]} -eq 1 ]]
 }
 
 verify_detached_signature() {
     local key="$1" signature="$2" content="$3" home
+    _key_has_one_primary "$key" || return 1
     home="$(mktemp -d)" || return 1
     chmod 700 "$home"
     GNUPGHOME="$home" gpg --batch --quiet --import "$key" >/dev/null 2>&1 \
@@ -25,18 +37,22 @@ verify_detached_signature() {
 }
 
 download_sha256() {
-    local url="$1" expected="$2" max_bytes="$3" destination="$4" actual
+    local url="$1" expected="$2" max_bytes="$3" destination="$4" actual directory filename
 
     [[ "$expected" =~ ^[0-9a-f]{64}$ ]] || return 1
     actual="$expected"
 
-    local part="${destination}.part"
+    directory="$(dirname -- "$destination")"
+    filename="$(basename -- "$destination")"
     (
-        trap 'rm -f -- "$part"' EXIT
+        local part=""
+        trap '[[ -z "$part" ]] || rm -f -- "$part"' EXIT
         trap 'exit 130' INT
         trap 'exit 143' TERM
         [[ "$max_bytes" =~ ^[1-9][0-9]*$ ]] || exit 1
-        [[ -n "$destination" && -d "$(dirname "$destination")" ]] || exit 1
+        [[ -n "$destination" && -d "$directory" ]] || exit 1
+        umask 077
+        part="$(mktemp "$directory/.${filename}.part.XXXXXX")" || exit 1
         curl --fail --location --connect-timeout 10 --max-time 600 \
             --max-filesize "$max_bytes" --output "$part" "$url" \
             || exit 1

tests/setup/fixtures/provenance/SHASUMS256.txt

@@ -1 +1,4 @@
 291bd319ae85488101e908e37fc0fa1b0da1429ba27e10d2b391cb3f60dd44ea  tiny-artifact
+5043218f6d8ecdb2ba78665116f74e7f53ce29d164117a0b6cb0f946811d3455  tiny-artifact-tampered
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa  metadata-only-1
+bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb  metadata-only-2

tests/setup/fixtures/provenance/SHASUMS256.txt.asc

@@ -1,11 +1,11 @@
 -----BEGIN PGP SIGNATURE-----
 
-iQEzBAABCgAdFiEEYBb/GMrimM42SO4jJeAfdl4e+foFAmqQBJoACgkQJeAfdl4e
+iQEzBAABCgAdFiEEYBb/GMrimM42SO4jJeAfdl4e+foFAmqQCQ8ACgkQJeAfdl4e
-+foW9Qf/QLO0N5vVdG3Fi9ql6SE3dZItZtrJy4jFVPDEVEZJK4PoT9iRE/RQwqsU
++fqUiQgAgPaA6eTS3ag1YMLhT4r3JVpL40HgKTLBfTgRjsc/AVwG9aV9BMYMHwGT
-7y86B1x0JmCoxVRigLD75gz8IYb8SzchbTrUQRB/l0FBjNZaeAX1O+E8GZIsK9Kf
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+6/4ZW/j/7tMeVr2Oqw4Vv5quvLQ2DO/ZE3vMtKJ+sRvVHnczlQJrrKpzJ15pVv5l
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-ud9GyH1AtgGlQ3XALb4UotE3Btf8GiZ1Mg/igxZqvjCJhrfOiaeziKi4a80fhv9z
+/rkUQrc2CGwBEUSwDDMLELLMTHc/Ivm6xLQOI+TbT53+1IupyUu5gquRM7pdKGw7
-j1KFafXj9lc69vBgayepHF8BH6bocQ==
+SYTz3awbjyEzFLt60AnPsSWNyo5N6A==
-=nTYb
+=MJqv
 -----END PGP SIGNATURE-----

tests/setup/fixtures/provenance/tiny-artifact-tampered

@@ -1 +1 @@
-tampered artifact
+tiny artifacT

tests/setup/fixtures/provenance/wrong-signer-SHASUMS256.txt.asc

@@ -0,0 +1,11 @@
+-----BEGIN PGP SIGNATURE-----
+
+iQEzBAABCgAdFiEE8NsXb+IUusO1vCd8zouSo0jXorAFAmqQCQ8ACgkQzouSo0jX
+orCpQAf+PB6BsCoq/Sp4LShSNTlZkDWS7p641A29OgAtr6QYUphMsI+gY6tKK0zr
+zmDzs4MyZaSy/yx9jEdPyyVWLFREk0u/x6YpQwj8KGbtuTt/hBQgkshDZZeVdGLr
+x11bkZgOENjzRS/NnKiziwoVVwaZm36WrsCef6Q26sbxCnYF2nWlGNtP9SKnhxSV
+/FYXi/wW41p8iZqIb0SFRoMGMsazV5i9XOjTLx4dEiMaeGvnNdZoMDGIO8in7mJG
+pkYro8coAGwjyC48VZmCPFG0TPqVhc0LEYKcI4M1OyEX38xQqaoRm5k9sOswfyDF
+iTFTwna0Zb1nurK/28/WfUHqLEIlQw==
+=PvFe
+-----END PGP SIGNATURE-----

tests/setup/fixtures/provenance/wrong-signer-fixture.rpm.base64

@@ -0,0 +1,118 @@
+7avu2wMAAAAAAHBhbmFtYS1wcm92ZW5hbmNlLWZpeHR1cmUtMS0xAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAUAAAAAAAAAAAAAAAAAAAAAjq3oAQAAAAAAAAAIAAAQpAAA
+AD4AAAAHAAAQlAAAABAAAAEMAAAABwAAAAAAAAE2AAABDQAAAAYAAAE2AAAAAQAAAREAAAAGAAAB
+XwAAAAEAAAPoAAAABAAAAaAAAAABAAAD7AAAAAcAAAGkAAAAEAAAA+8AAAAEAAABtAAAAAEAAAPw
+AAAABwAAAbgAAA7ciQEzBAABCgAdFiEE8NsXb+IUusO1vCd8zouSo0jXorAFAmqQCOUACgkQzouS
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+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA+AAAAB////4AAAAAQAAAA
+AI6t6AEAAAAAAAAAMwAABOEAAAA/AAAABwAABNEAAAAQAAAAZAAAAAgAAAAAAAAAAQAAA+gAAAAG
+AAAAAgAAAAEAAAPpAAAABgAAABwAAAABAAAD6gAAAAYAAAAeAAAAAQAAA+wAAAAJAAAAIAAAAAEA
+AAPtAAAACQAAAD8AAAABAAAD7gAAAAQAAABYAAAAAQAAA+8AAAAGAAAAXAAAAAEAAAPxAAAABAAA
+AGgAAAABAAAD9gAAAAYAAABsAAAAAQAAA/gAAAAJAAAAcAAAAAEAAAP9AAAABgAAAHwAAAABAAAD
+/gAAAAYAAACCAAAAAQAABAQAAAAEAAAAjAAAAAEAAAQGAAAAAwAAAJAAAAABAAAECQAAAAMAAACS
+AAAAAQAABAoAAAAEAAAAlAAAAAEAAAQLAAAACAAAAJgAAAABAAAEDAAAAAgAAADZAAAAAQAABA0A
+AAAEAAAA3AAAAAEAAAQPAAAACAAAAOAAAAABAAAEEAAAAAgAAADlAAAAAQAABBQAAAAGAAAA6gAA
+AAEAAAQVAAAABAAAARAAAAABAAAEFwAAAAgAAAEUAAAAAQAABBgAAAAEAAABMAAAAAQAAAQZAAAA
+CAAAAUAAAAAEAAAEGgAAAAgAAAGlAAAABAAABCgAAAAGAAABxAAAAAEAAARHAAAABAAAAcwAAAAB
+AAAESAAAAAQAAAHQAAAAAQAABEkAAAAIAAAB1AAAAAEAAARYAAAABAAAAdgAAAABAAAEWQAAAAgA
+AAHcAAAAAQAABFwAAAAEAAAB4AAAAAEAAARdAAAACAAAAeQAAAABAAAEXgAAAAgAAAHwAAAAAQAA
+BGIAAAAGAAACFgAAAAEAAARkAAAABgAABAUAAAABAAAEZQAAAAYAAAQKAAAAAQAABGYAAAAGAAAE
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+AAAAAAAAAAiBpAAAapAEmmU4MGI3MWNkMTRkM2NiZDY1ZjQxNzNhYmNiZmNmMDFhNTQ1ZGJjYTMy
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+wR+ajfOLFw8MIACTzAMyvJyYeLFKvjdrmx/Z4OEGZKVOuIQR

tests/setup/fixtures/provenance/wrong-signer-key.asc

@@ -0,0 +1,18 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
+mQENBGqQCOUBCADHP/S269aT5t0ZvePSetTa1h2KtcwiQ+LEkWMvHM8sYCrHDjer
+XR53nj+e9xZPmXtEIiYsE1LpR7ax8dwcm/1XDqFLeduCRkB6DQE4Q5Ia1u9EXpjc
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+MQl6tgcI8JX9lnsMxK+h9mAIilFQUmdX1Qio4FjWYLI=
+=l5kF
+-----END PGP PUBLIC KEY BLOCK-----

tests/setup/package-provenance-contract

@@ -47,6 +47,14 @@ snapshot() {
     fi
 }
 
+snapshot_gpg_state() {
+    local path="$1" file
+    [[ -d "$path" ]] || return 0
+    while IFS= read -r file; do
+        sha256sum "$file"
+    done < <(find "$path" -maxdepth 1 -type f \( -name pubring.kbx -o -name trustdb.gpg \) | sort)
+}
+
 # This must be the only production file sourced by the contract.
 # shellcheck source=../../setup/lib/artifact-provenance
 source "$repo_dir/setup/lib/artifact-provenance"
@@ -55,30 +63,46 @@ fixture_fingerprint='6016FF18CAE298CE3648EE2325E01F765E1EF9FA'
 tiny_sha256='291bd319ae85488101e908e37fc0fa1b0da1429ba27e10d2b391cb3f60dd44ea'
 base64 --decode "$fixtures/signed-fixture.rpm.base64" > "$test_tmp/signed-fixture.rpm"
 base64 --decode "$fixtures/unsigned-fixture.rpm.base64" > "$test_tmp/unsigned-fixture.rpm"
+base64 --decode "$fixtures/wrong-signer-fixture.rpm.base64" > "$test_tmp/wrong-signer-fixture.rpm"
+
+[[ "$(wc -l < "$fixtures/SHASUMS256.txt")" -eq 4 ]] || fail 'signed checksum fixture is not four lines'
+[[ "$(cmp -l "$fixtures/tiny-artifact" "$fixtures/tiny-artifact-tampered" | wc -l)" -eq 1 ]] \
+    || fail 'tampered artifact does not differ by exactly one byte'
 
 expect_success key_fingerprint_matches "$fixtures/fixture-key.asc" "$fixture_fingerprint"
 expect_failure key_fingerprint_matches "$fixtures/fixture-key.asc" '0000000000000000000000000000000000000000'
+cat "$fixtures/fixture-key.asc" "$fixtures/wrong-signer-key.asc" > "$test_tmp/combined-key.asc"
+expect_failure key_fingerprint_matches "$test_tmp/combined-key.asc" "$fixture_fingerprint"
 
 expect_success verify_detached_signature \
     "$fixtures/fixture-key.asc" "$fixtures/SHASUMS256.txt.asc" "$fixtures/SHASUMS256.txt"
 expect_failure verify_detached_signature \
     "$fixtures/fixture-key.asc" "$fixtures/SHASUMS256.txt.asc" "$fixtures/tiny-artifact"
 cp "$fixtures/SHASUMS256.txt.asc" "$test_tmp/bad-signature.asc"
-sed -i 's/^=nTYb$/=nTYa/' "$test_tmp/bad-signature.asc"
+sed -i 's/^=MJqv$/=MJqa/' "$test_tmp/bad-signature.asc"
 expect_failure verify_detached_signature \
     "$fixtures/fixture-key.asc" "$test_tmp/bad-signature.asc" "$fixtures/SHASUMS256.txt"
+expect_failure verify_detached_signature \
+    "$test_tmp/combined-key.asc" "$fixtures/wrong-signer-SHASUMS256.txt.asc" "$fixtures/SHASUMS256.txt"
 
 mkdir "$test_tmp/bin"
 cat > "$test_tmp/bin/curl" <<'STUB'
 #!/usr/bin/env bash
 set -euo pipefail
 output=''
+connect_timeout=''
+max_time=''
+max_filesize=''
 while (($#)); do
     case "$1" in
         --output) output="$2"; shift 2 ;;
+        --connect-timeout) connect_timeout="$2"; shift 2 ;;
+        --max-time) max_time="$2"; shift 2 ;;
+        --max-filesize) max_filesize="$2"; shift 2 ;;
         *) shift ;;
     esac
 done
+[[ "$connect_timeout" == 10 && "$max_time" == 600 && "$max_filesize" == "${CURL_EXPECTED_MAX_BYTES:?}" ]] || exit 65
 case "${CURL_FIXTURE:?}" in
     good) cp "$CURL_FIXTURE_ROOT/tiny-artifact" "$output" ;;
     oversized) head -c 1025 /dev/zero > "$output" ;;
@@ -88,7 +112,7 @@ esac
 STUB
 chmod +x "$test_tmp/bin/curl"
 PATH="$test_tmp/bin:$PATH"
-export PATH CURL_FIXTURE_ROOT="$fixtures"
+export PATH CURL_FIXTURE_ROOT="$fixtures" CURL_EXPECTED_MAX_BYTES=1024
 
 destination="$test_tmp/destination"
 export CURL_FIXTURE=good
@@ -108,6 +132,23 @@ expect_failure download_sha256 'https://fixture.invalid/bad-digest' \
 assert_file_bytes "$destination" 'known-good'
 [[ ! -e "$destination.part" ]] || fail 'bad digest left a part file'
 
+protected="$test_tmp/protected-known-good"
+printf 'known-good\n' > "$protected"
+ln -s "$protected" "$destination.part"
+expect_failure download_sha256 'https://fixture.invalid/symlink-part' \
+    '0000000000000000000000000000000000000000000000000000000000000000' 1024 "$destination"
+assert_file_bytes "$protected" 'known-good'
+[[ -L "$destination.part" ]] || fail 'symlinked destination part was not preserved'
+rm -f -- "$destination.part"
+
+ln "$protected" "$destination.part"
+expect_failure download_sha256 'https://fixture.invalid/hard-link-part' \
+    '0000000000000000000000000000000000000000000000000000000000000000' 1024 "$destination"
+assert_file_bytes "$protected" 'known-good'
+[[ "$(stat -c %i "$protected")" == "$(stat -c %i "$destination.part")" ]] \
+    || fail 'hard-linked destination part was not preserved'
+rm -f -- "$destination.part"
+
 export CURL_FIXTURE=oversized
 expect_failure download_sha256 'https://fixture.invalid/oversized' "$tiny_sha256" 1024 "$destination"
 assert_file_bytes "$destination" 'known-good'
@@ -119,6 +160,7 @@ assert_file_bytes "$destination" 'known-good'
 [[ ! -e "$destination.part" ]] || fail 'interrupted download left a part file'
 
 before_gnupg="$(snapshot "$host_gnupg")"
+before_gpg_files="$(snapshot_gpg_state "$host_gnupg")"
 before_rpmdb="$(snapshot "$host_rpmdb")"
 expect_success rpm_signature_matches \
     "$test_tmp/signed-fixture.rpm" "$fixtures/fixture-key.asc" "$fixture_fingerprint"
@@ -126,11 +168,29 @@ expect_failure rpm_signature_matches \
     "$test_tmp/unsigned-fixture.rpm" "$fixtures/fixture-key.asc" "$fixture_fingerprint"
 expect_failure rpm_signature_matches \
     "$test_tmp/signed-fixture.rpm" "$fixtures/fixture-key.asc" '0000000000000000000000000000000000000000'
+expect_failure rpm_signature_matches \
+    "$test_tmp/wrong-signer-fixture.rpm" "$fixtures/fixture-key.asc" "$fixture_fingerprint"
+expect_failure rpm_signature_matches \
+    "$test_tmp/wrong-signer-fixture.rpm" "$test_tmp/combined-key.asc" "$fixture_fingerprint"
 [[ "$before_gnupg" == "$(snapshot "$host_gnupg")" ]] || fail 'host GPG state changed'
+[[ "$before_gpg_files" == "$(snapshot_gpg_state "$host_gnupg")" ]] || fail 'host GPG keybox or trust database changed'
 [[ "$before_rpmdb" == "$(snapshot "$host_rpmdb")" ]] || fail 'host RPM database changed'
 
 expect_success load_installer_provenance "$config"
 [[ "${INSTALLER_PROVENANCE[BUN_VERSION]:-}" == '1.4.0' ]] || fail 'valid provenance was not loaded'
+for key_spec in \
+    'terra44 TERRA_FINGERPRINT' \
+    'claude-code CLAUDE_CODE_FINGERPRINT' \
+    'bun BUN_FINGERPRINT' \
+    'rpmfusion-free RPMFUSION_FREE_FINGERPRINT' \
+    'rpmfusion-nonfree RPMFUSION_NONFREE_FINGERPRINT' \
+    'hyprland-copr HYPRLAND_COPR_FINGERPRINT' \
+    'flathub FLATHUB_FINGERPRINT' \
+    'claude-desktop CLAUDE_DESKTOP_FINGERPRINT'; do
+    read -r key_file fingerprint_name <<<"$key_spec"
+    expect_success key_fingerprint_matches "$repo_dir/setup/provenance/keys/$key_file.asc" \
+        "${INSTALLER_PROVENANCE[$fingerprint_name]}"
+done
 
 parser_fixture="$test_tmp/installers.conf"
 cp "$config" "$parser_fixture"