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libstore: Improve store-reference back-compat with IPv6 ZoneId literals

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This restores the pre-2.31 handling of ZoneID identifiers in store references.
It's the only place we reasonably care about this back-compat.

(cherry picked from commit 8dbc2475f7)
This commit is contained in:
Sergei Zimmerman 2025-11-01 00:36:15 +03:00 • committed by github-actions[bot]
parent 60e906a535
commit 43f7704edc
8 changed files with 92 additions and 2 deletions
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1
src/libstore-tests/data/store-reference/ssh_unbracketed_ipv6_4.txt Normal file
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@ -0,0 +1 @@
ssh://userinfo@[fea5:23e1:3916:fc24:cb52:2837:2ecb:ea8e%eth0]?a=b&c=d

1
src/libstore-tests/data/store-reference/ssh_unbracketed_ipv6_5.txt Normal file
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@ -0,0 +1 @@
ssh://userinfo@[fea5:23e1:3916:fc24:cb52:2837:2ecb:ea8e%25eth0]?a=b&c=d

1
src/libstore-tests/data/store-reference/ssh_unbracketed_ipv6_6.txt Normal file
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@ -0,0 +1 @@
ssh://userinfo@fea5:23e1:3916:fc24:cb52:2837:2ecb:ea8e%25?a=b&c=d

1
src/libstore-tests/data/store-reference/ssh_unbracketed_ipv6_7.txt Normal file
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@ -0,0 +1 @@
ssh://userinfo@fea5:23e1:3916:fc24:cb52:2837:2ecb:ea8e%eth0?a=b&c=d

1
src/libstore-tests/data/store-reference/ssh_unbracketed_ipv6_8.txt Normal file
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@ -0,0 +1 @@
ssh://fea5:23e1:3916:fc24:cb52:2837:2ecb:ea8e%eth0?a=b&c=d

1
src/libstore-tests/data/store-reference/ssh_unbracketed_ipv6_9.txt Normal file
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@ -0,0 +1 @@
ssh://fea5:23e1:3916:fc24:cb52:2837:2ecb:ea8e%eth0

60
src/libstore-tests/store-reference.cc
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@ -183,4 +183,64 @@ static StoreReference sshIPv6AuthorityWithUserinfoAndParams{
URI_TEST_READ(ssh_unbracketed_ipv6_3, sshIPv6AuthorityWithUserinfoAndParams)
static const StoreReference sshIPv6AuthorityWithUserinfoAndParamsAndZoneId{
.variant =
StoreReference::Specified{
.scheme = "ssh",
.authority = "userinfo@[fea5:23e1:3916:fc24:cb52:2837:2ecb:ea8e%25eth0]",
},
.params =
{
{"a", "b"},
{"c", "d"},
},
};
URI_TEST_READ(ssh_unbracketed_ipv6_4, sshIPv6AuthorityWithUserinfoAndParamsAndZoneId)
URI_TEST_READ(ssh_unbracketed_ipv6_5, sshIPv6AuthorityWithUserinfoAndParamsAndZoneId)
static const StoreReference sshIPv6AuthorityWithUserinfoAndParamsAndZoneIdTricky{
.variant =
StoreReference::Specified{
.scheme = "ssh",
.authority = "userinfo@[fea5:23e1:3916:fc24:cb52:2837:2ecb:ea8e%2525]",
},
.params =
{
{"a", "b"},
{"c", "d"},
},
};
// Non-standard syntax where the IPv6 literal appears without brackets. In
// this case don't considering %25 to be a pct-encoded % and just take it as a
// literal value. 25 is a perfectly legal ZoneId value in theory.
URI_TEST_READ(ssh_unbracketed_ipv6_6, sshIPv6AuthorityWithUserinfoAndParamsAndZoneIdTricky)
URI_TEST_READ(ssh_unbracketed_ipv6_7, sshIPv6AuthorityWithUserinfoAndParamsAndZoneId)
static const StoreReference sshIPv6AuthorityWithParamsAndZoneId{
.variant =
StoreReference::Specified{
.scheme = "ssh",
.authority = "[fea5:23e1:3916:fc24:cb52:2837:2ecb:ea8e%25eth0]",
},
.params =
{
{"a", "b"},
{"c", "d"},
},
};
URI_TEST_READ(ssh_unbracketed_ipv6_8, sshIPv6AuthorityWithParamsAndZoneId)
static const StoreReference sshIPv6AuthorityWithZoneId{
.variant =
StoreReference::Specified{
.scheme = "ssh",
.authority = "[fea5:23e1:3916:fc24:cb52:2837:2ecb:ea8e%25eth0]",
},
};
URI_TEST_READ(ssh_unbracketed_ipv6_9, sshIPv6AuthorityWithZoneId)
} // namespace nix

28
src/libstore/store-reference.cc
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@ -123,7 +123,27 @@ StoreReference StoreReference::parse(const std::string & uri, const StoreReferen
* greedily assumed to be the part of the host address. */
auto authorityString = schemeAndAuthority->authority;
auto userinfo = splitPrefixTo(authorityString, '@');
auto maybeIpv6 = boost::urls::parse_ipv6_address(authorityString);
/* Back-compat shim for ZoneId specifiers. Technically this isn't
* standard, but the expectation is this works with the old syntax
* for ZoneID specifiers. For the full story behind the fiasco that
* is ZoneID in URLs look at [^].
* [^]: https://datatracker.ietf.org/doc/html/draft-schinazi-httpbis-link-local-uri-bcp-03
*/
/* Fish out the internals from inside square brackets. It might be that the pct-sign is unencoded and that's
* why we failed to parse it previously. */
if (authorityString.starts_with('[') && authorityString.ends_with(']')) {
authorityString.remove_prefix(1);
authorityString.remove_suffix(1);
}
auto maybeBeforePct = splitPrefixTo(authorityString, '%');
bool hasZoneId = maybeBeforePct.has_value();
auto maybeZoneId = hasZoneId ? std::optional{authorityString} : std::nullopt;
std::string_view maybeIpv6S = maybeBeforePct.value_or(authorityString);
auto maybeIpv6 = boost::urls::parse_ipv6_address(maybeIpv6S);
if (maybeIpv6) {
std::string fixedAuthority;
if (userinfo) {
@ -131,7 +151,11 @@ StoreReference StoreReference::parse(const std::string & uri, const StoreReferen
fixedAuthority += '@';
}
fixedAuthority += '[';
fixedAuthority += authorityString;
fixedAuthority += maybeIpv6S;
if (maybeZoneId) {
fixedAuthority += "%25"; // pct-encoded percent character
fixedAuthority += *maybeZoneId;
}
fixedAuthority += ']';
return {
.variant =