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[HSTS] Let parent hosts determine whether HSTS subs should be applied.

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This aligns with the wording in RFC 6797.
This commit is contained in:
Moonchild 2024-01-24 18:10:20 +01:00 • committed by roytam1
commit 462aac7d98
1 changed files with 5 additions and 3 deletions
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8
security/manager/ssl/nsSiteSecurityService.cpp
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@ -658,8 +658,11 @@ nsSiteSecurityService::IsSecureHost(uint32_t aType, const char* aHost,
*aCached = true;
}
if (siteState.mHSTSState == SecurityPropertySet) {
*aResult = siteState.mHSTSIncludeSubdomains;
break;
// We do not break here, and continue to walk up the domain in case
// any parent domain has HSTS set with included subdomains in which
// case it will take precedence. See RFC 6797.
// We latch the result with an or-assignment.
*aResult |= siteState.mHSTSIncludeSubdomains;
} else if (siteState.mHSTSState == SecurityPropertyNegative) {
*aResult = false;
break;
@ -675,7 +678,6 @@ nsSiteSecurityService::IsSecureHost(uint32_t aType, const char* aHost,
SSSLOG(("no HSTS data for %s found, walking up domain", subdomain));
}
// Use whatever we ended up with, which defaults to false.
return NS_OK;
}