[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache - #101144

Merged
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging
Apr 23, 2024
Merged

[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache#101144
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging

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@github-actionsgithub-actionsBot commented Apr 16, 2024

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Backport of #101120 to release/8.0-staging

Fixes#101090

/cc @rzikm

Customer Impact

X509Certificates imported from PFX may be temporarily stored on disk. We extended their lifetime in .NET 8.0 (see details below) and they might not be deleted by the process. For short-lived processes, it may lead to disk space exhaustion.
Reported by a large service -- operating in environment with limited disk space and short-lived processes.

Technical details

PR #79898 fixed SslStream.IsMutuallyAuthenticated property for scenarios with TLS resumed sessions -- we found out that in some older windows versions we cannot reliably query whether the resumed session used a client certificate (important information for the property to be accurate). As a workaround, we added a reference to the X509Certificate instance on the record in the internal TLS session cache, which prolongs the lifetime of the X509Certificate.

X509Certificates constructed by importing PFX certificate have their keys stored in a key file on disk. Dispose() of the certificate is implemented such that the key file is cleaned up. Keeping a reference to the certificate from TLS session cache prevents this cleanup to happen (regardless whether user properly disposed of the certificate). The key file will then outlive the process it was created in. In scenarios with many short-lived processes which do mutually-authenticated HTTPS requests with such certificates will lead to accumulation of those files, potentially exhausting disk space.

Since we don't use the value of the certificate in any part of the code, only the knowledge whether one was used or not, we can replace the cert reference by a simple bool flag which does not extend the lifetime of the certificate.

Regression

Yes, introduced in .NET 8 in PR #79898.

Testing

Verified on the provided isolated repro from the original issue #101090.
E2E verification done by reporting customer via provided private bits.

Risk

Low, the issue is well understood and the fix is small and contained to affected code path (using client certificates on Windows).

rzikmand others added 2 commits April 16, 2024 21:06
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@rzikmrzikm changed the title [release/8.0-staging] Avoid rooting X509Certificate2 in SslSessionCache[release/8.0] Avoid rooting X509Certificate2 in SslSessionCacheApr 17, 2024
@rzikmrzikm self-assigned this Apr 17, 2024
@karelzkarelz added this to the 8.0.x milestone Apr 17, 2024
@rzikm
rzikm requested a review from wfurtApril 17, 2024 13:28
@rzikmrzikm added the Servicing-approved Approved for servicing release label Apr 18, 2024
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rzikm merged commit 0b84eae into release/8.0-stagingApr 23, 2024
@jkotas
jkotas deleted the backport/pr-101120-to-release/8.0-staging branch April 27, 2024 22:49
@rzikmrzikm modified the milestones: 8.0.x, 8.0.6May 16, 2024
@github-actionsgithub-actionsBot locked and limited conversation to collaborators Jun 15, 2024
@karelzkarelz modified the milestones: 8.0.6, 8.0.7Jun 25, 2024
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
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[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache - #101144

Merged
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging
Apr 23, 2024
Merged

[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache#101144
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging

Conversation

@github-actions

@github-actionsgithub-actionsBot commented Apr 16, 2024

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Backport of #101120 to release/8.0-staging

Fixes#101090

/cc @rzikm

Customer Impact

X509Certificates imported from PFX may be temporarily stored on disk. We extended their lifetime in .NET 8.0 (see details below) and they might not be deleted by the process. For short-lived processes, it may lead to disk space exhaustion.
Reported by a large service -- operating in environment with limited disk space and short-lived processes.

Technical details

PR #79898 fixed SslStream.IsMutuallyAuthenticated property for scenarios with TLS resumed sessions -- we found out that in some older windows versions we cannot reliably query whether the resumed session used a client certificate (important information for the property to be accurate). As a workaround, we added a reference to the X509Certificate instance on the record in the internal TLS session cache, which prolongs the lifetime of the X509Certificate.

X509Certificates constructed by importing PFX certificate have their keys stored in a key file on disk. Dispose() of the certificate is implemented such that the key file is cleaned up. Keeping a reference to the certificate from TLS session cache prevents this cleanup to happen (regardless whether user properly disposed of the certificate). The key file will then outlive the process it was created in. In scenarios with many short-lived processes which do mutually-authenticated HTTPS requests with such certificates will lead to accumulation of those files, potentially exhausting disk space.

Since we don't use the value of the certificate in any part of the code, only the knowledge whether one was used or not, we can replace the cert reference by a simple bool flag which does not extend the lifetime of the certificate.

Regression

Yes, introduced in .NET 8 in PR #79898.

Testing

Verified on the provided isolated repro from the original issue #101090.
E2E verification done by reporting customer via provided private bits.

Risk

Low, the issue is well understood and the fix is small and contained to affected code path (using client certificates on Windows).

rzikmand others added 2 commits April 16, 2024 21:06
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See info in area-owners.md if you want to be subscribed.

@rzikmrzikm changed the title [release/8.0-staging] Avoid rooting X509Certificate2 in SslSessionCache[release/8.0] Avoid rooting X509Certificate2 in SslSessionCacheApr 17, 2024
@rzikmrzikm self-assigned this Apr 17, 2024
@karelzkarelz added this to the 8.0.x milestone Apr 17, 2024
@rzikm
rzikm requested a review from wfurtApril 17, 2024 13:28
@rzikmrzikm added the Servicing-approved Approved for servicing release label Apr 18, 2024
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@rzikm
rzikm merged commit 0b84eae into release/8.0-stagingApr 23, 2024
@jkotas
jkotas deleted the backport/pr-101120-to-release/8.0-staging branch April 27, 2024 22:49
@rzikmrzikm modified the milestones: 8.0.x, 8.0.6May 16, 2024
@github-actionsgithub-actionsBot locked and limited conversation to collaborators Jun 15, 2024
@karelzkarelz modified the milestones: 8.0.6, 8.0.7Jun 25, 2024
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix"); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache - #101144

Merged
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging
Apr 23, 2024
Merged

[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache#101144
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging

Conversation

@github-actions

@github-actionsgithub-actionsBot commented Apr 16, 2024

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Backport of #101120 to release/8.0-staging

Fixes#101090

/cc @rzikm

Customer Impact

X509Certificates imported from PFX may be temporarily stored on disk. We extended their lifetime in .NET 8.0 (see details below) and they might not be deleted by the process. For short-lived processes, it may lead to disk space exhaustion.
Reported by a large service -- operating in environment with limited disk space and short-lived processes.

Technical details

PR #79898 fixed SslStream.IsMutuallyAuthenticated property for scenarios with TLS resumed sessions -- we found out that in some older windows versions we cannot reliably query whether the resumed session used a client certificate (important information for the property to be accurate). As a workaround, we added a reference to the X509Certificate instance on the record in the internal TLS session cache, which prolongs the lifetime of the X509Certificate.

X509Certificates constructed by importing PFX certificate have their keys stored in a key file on disk. Dispose() of the certificate is implemented such that the key file is cleaned up. Keeping a reference to the certificate from TLS session cache prevents this cleanup to happen (regardless whether user properly disposed of the certificate). The key file will then outlive the process it was created in. In scenarios with many short-lived processes which do mutually-authenticated HTTPS requests with such certificates will lead to accumulation of those files, potentially exhausting disk space.

Since we don't use the value of the certificate in any part of the code, only the knowledge whether one was used or not, we can replace the cert reference by a simple bool flag which does not extend the lifetime of the certificate.

Regression

Yes, introduced in .NET 8 in PR #79898.

Testing

Verified on the provided isolated repro from the original issue #101090.
E2E verification done by reporting customer via provided private bits.

Risk

Low, the issue is well understood and the fix is small and contained to affected code path (using client certificates on Windows).

rzikmand others added 2 commits April 16, 2024 21:06
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Tagging subscribers to this area: @dotnet/ncl, @bartonjs, @vcsjones
See info in area-owners.md if you want to be subscribed.

@rzikmrzikm changed the title [release/8.0-staging] Avoid rooting X509Certificate2 in SslSessionCache[release/8.0] Avoid rooting X509Certificate2 in SslSessionCacheApr 17, 2024
@rzikmrzikm self-assigned this Apr 17, 2024
@karelzkarelz added this to the 8.0.x milestone Apr 17, 2024
@rzikm
rzikm requested a review from wfurtApril 17, 2024 13:28
@rzikmrzikm added the Servicing-approved Approved for servicing release label Apr 18, 2024
@rzikm

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@rzikm
rzikm merged commit 0b84eae into release/8.0-stagingApr 23, 2024
@jkotas
jkotas deleted the backport/pr-101120-to-release/8.0-staging branch April 27, 2024 22:49
@rzikmrzikm modified the milestones: 8.0.x, 8.0.6May 16, 2024
@github-actionsgithub-actionsBot locked and limited conversation to collaborators Jun 15, 2024
@karelzkarelz modified the milestones: 8.0.6, 8.0.7Jun 25, 2024
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@rzikm@karelz@wfurt
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache - #101144

Merged
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging
Apr 23, 2024
Merged

[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache#101144
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging

Conversation

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@github-actionsgithub-actionsBot commented Apr 16, 2024

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Backport of #101120 to release/8.0-staging

Fixes#101090

/cc @rzikm

Customer Impact

X509Certificates imported from PFX may be temporarily stored on disk. We extended their lifetime in .NET 8.0 (see details below) and they might not be deleted by the process. For short-lived processes, it may lead to disk space exhaustion.
Reported by a large service -- operating in environment with limited disk space and short-lived processes.

Technical details

PR #79898 fixed SslStream.IsMutuallyAuthenticated property for scenarios with TLS resumed sessions -- we found out that in some older windows versions we cannot reliably query whether the resumed session used a client certificate (important information for the property to be accurate). As a workaround, we added a reference to the X509Certificate instance on the record in the internal TLS session cache, which prolongs the lifetime of the X509Certificate.

X509Certificates constructed by importing PFX certificate have their keys stored in a key file on disk. Dispose() of the certificate is implemented such that the key file is cleaned up. Keeping a reference to the certificate from TLS session cache prevents this cleanup to happen (regardless whether user properly disposed of the certificate). The key file will then outlive the process it was created in. In scenarios with many short-lived processes which do mutually-authenticated HTTPS requests with such certificates will lead to accumulation of those files, potentially exhausting disk space.

Since we don't use the value of the certificate in any part of the code, only the knowledge whether one was used or not, we can replace the cert reference by a simple bool flag which does not extend the lifetime of the certificate.

Regression

Yes, introduced in .NET 8 in PR #79898.

Testing

Verified on the provided isolated repro from the original issue #101090.
E2E verification done by reporting customer via provided private bits.

Risk

Low, the issue is well understood and the fix is small and contained to affected code path (using client certificates on Windows).

rzikmand others added 2 commits April 16, 2024 21:06
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Tagging subscribers to this area: @dotnet/ncl, @bartonjs, @vcsjones
See info in area-owners.md if you want to be subscribed.

@rzikmrzikm changed the title [release/8.0-staging] Avoid rooting X509Certificate2 in SslSessionCache[release/8.0] Avoid rooting X509Certificate2 in SslSessionCacheApr 17, 2024
@rzikmrzikm self-assigned this Apr 17, 2024
@karelzkarelz added this to the 8.0.x milestone Apr 17, 2024
@rzikm
rzikm requested a review from wfurtApril 17, 2024 13:28
@rzikmrzikm added the Servicing-approved Approved for servicing release label Apr 18, 2024
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@rzikm
rzikm merged commit 0b84eae into release/8.0-stagingApr 23, 2024
@jkotas
jkotas deleted the backport/pr-101120-to-release/8.0-staging branch April 27, 2024 22:49
@rzikmrzikm modified the milestones: 8.0.x, 8.0.6May 16, 2024
@github-actionsgithub-actionsBot locked and limited conversation to collaborators Jun 15, 2024
@karelzkarelz modified the milestones: 8.0.6, 8.0.7Jun 25, 2024
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + '
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[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache - #101144

Merged
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging
Apr 23, 2024
Merged

[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache#101144
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging

Conversation

@github-actions

@github-actionsgithub-actionsBot commented Apr 16, 2024

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Backport of #101120 to release/8.0-staging

Fixes#101090

/cc @rzikm

Customer Impact

X509Certificates imported from PFX may be temporarily stored on disk. We extended their lifetime in .NET 8.0 (see details below) and they might not be deleted by the process. For short-lived processes, it may lead to disk space exhaustion.
Reported by a large service -- operating in environment with limited disk space and short-lived processes.

Technical details

PR #79898 fixed SslStream.IsMutuallyAuthenticated property for scenarios with TLS resumed sessions -- we found out that in some older windows versions we cannot reliably query whether the resumed session used a client certificate (important information for the property to be accurate). As a workaround, we added a reference to the X509Certificate instance on the record in the internal TLS session cache, which prolongs the lifetime of the X509Certificate.

X509Certificates constructed by importing PFX certificate have their keys stored in a key file on disk. Dispose() of the certificate is implemented such that the key file is cleaned up. Keeping a reference to the certificate from TLS session cache prevents this cleanup to happen (regardless whether user properly disposed of the certificate). The key file will then outlive the process it was created in. In scenarios with many short-lived processes which do mutually-authenticated HTTPS requests with such certificates will lead to accumulation of those files, potentially exhausting disk space.

Since we don't use the value of the certificate in any part of the code, only the knowledge whether one was used or not, we can replace the cert reference by a simple bool flag which does not extend the lifetime of the certificate.

Regression

Yes, introduced in .NET 8 in PR #79898.

Testing

Verified on the provided isolated repro from the original issue #101090.
E2E verification done by reporting customer via provided private bits.

Risk

Low, the issue is well understood and the fix is small and contained to affected code path (using client certificates on Windows).

rzikmand others added 2 commits April 16, 2024 21:06
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Tagging subscribers to this area: @dotnet/ncl, @bartonjs, @vcsjones
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@rzikmrzikm changed the title [release/8.0-staging] Avoid rooting X509Certificate2 in SslSessionCache[release/8.0] Avoid rooting X509Certificate2 in SslSessionCacheApr 17, 2024
@rzikmrzikm self-assigned this Apr 17, 2024
@karelzkarelz added this to the 8.0.x milestone Apr 17, 2024
@rzikm
rzikm requested a review from wfurtApril 17, 2024 13:28
@rzikmrzikm added the Servicing-approved Approved for servicing release label Apr 18, 2024
@rzikm

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@rzikm
rzikm merged commit 0b84eae into release/8.0-stagingApr 23, 2024
@jkotas
jkotas deleted the backport/pr-101120-to-release/8.0-staging branch April 27, 2024 22:49
@rzikmrzikm modified the milestones: 8.0.x, 8.0.6May 16, 2024
@github-actionsgithub-actionsBot locked and limited conversation to collaborators Jun 15, 2024
@karelzkarelz modified the milestones: 8.0.6, 8.0.7Jun 25, 2024
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@rzikm@karelz@wfurt
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache - #101144

Merged
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging
Apr 23, 2024
Merged

[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache#101144
rzikm merged 2 commits into
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backport/pr-101120-to-release/8.0-staging

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Backport of #101120 to release/8.0-staging

Fixes#101090

/cc @rzikm

Customer Impact

X509Certificates imported from PFX may be temporarily stored on disk. We extended their lifetime in .NET 8.0 (see details below) and they might not be deleted by the process. For short-lived processes, it may lead to disk space exhaustion.
Reported by a large service -- operating in environment with limited disk space and short-lived processes.

Technical details

PR #79898 fixed SslStream.IsMutuallyAuthenticated property for scenarios with TLS resumed sessions -- we found out that in some older windows versions we cannot reliably query whether the resumed session used a client certificate (important information for the property to be accurate). As a workaround, we added a reference to the X509Certificate instance on the record in the internal TLS session cache, which prolongs the lifetime of the X509Certificate.

X509Certificates constructed by importing PFX certificate have their keys stored in a key file on disk. Dispose() of the certificate is implemented such that the key file is cleaned up. Keeping a reference to the certificate from TLS session cache prevents this cleanup to happen (regardless whether user properly disposed of the certificate). The key file will then outlive the process it was created in. In scenarios with many short-lived processes which do mutually-authenticated HTTPS requests with such certificates will lead to accumulation of those files, potentially exhausting disk space.

Since we don't use the value of the certificate in any part of the code, only the knowledge whether one was used or not, we can replace the cert reference by a simple bool flag which does not extend the lifetime of the certificate.

Regression

Yes, introduced in .NET 8 in PR #79898.

Testing

Verified on the provided isolated repro from the original issue #101090.
E2E verification done by reporting customer via provided private bits.

Risk

Low, the issue is well understood and the fix is small and contained to affected code path (using client certificates on Windows).

rzikmand others added 2 commits April 16, 2024 21:06
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@rzikmrzikm changed the title [release/8.0-staging] Avoid rooting X509Certificate2 in SslSessionCache[release/8.0] Avoid rooting X509Certificate2 in SslSessionCacheApr 17, 2024
@rzikmrzikm self-assigned this Apr 17, 2024
@karelzkarelz added this to the 8.0.x milestone Apr 17, 2024
@rzikm
rzikm requested a review from wfurtApril 17, 2024 13:28
@rzikmrzikm added the Servicing-approved Approved for servicing release label Apr 18, 2024
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rzikm merged commit 0b84eae into release/8.0-stagingApr 23, 2024
@jkotas
jkotas deleted the backport/pr-101120-to-release/8.0-staging branch April 27, 2024 22:49
@rzikmrzikm modified the milestones: 8.0.x, 8.0.6May 16, 2024
@github-actionsgithub-actionsBot locked and limited conversation to collaborators Jun 15, 2024
@karelzkarelz modified the milestones: 8.0.6, 8.0.7Jun 25, 2024
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache - #101144

Merged
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging
Apr 23, 2024
Merged

[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache#101144
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging

Conversation

@github-actions

@github-actionsgithub-actionsBot commented Apr 16, 2024

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Backport of #101120 to release/8.0-staging

Fixes#101090

/cc @rzikm

Customer Impact

X509Certificates imported from PFX may be temporarily stored on disk. We extended their lifetime in .NET 8.0 (see details below) and they might not be deleted by the process. For short-lived processes, it may lead to disk space exhaustion.
Reported by a large service -- operating in environment with limited disk space and short-lived processes.

Technical details

PR #79898 fixed SslStream.IsMutuallyAuthenticated property for scenarios with TLS resumed sessions -- we found out that in some older windows versions we cannot reliably query whether the resumed session used a client certificate (important information for the property to be accurate). As a workaround, we added a reference to the X509Certificate instance on the record in the internal TLS session cache, which prolongs the lifetime of the X509Certificate.

X509Certificates constructed by importing PFX certificate have their keys stored in a key file on disk. Dispose() of the certificate is implemented such that the key file is cleaned up. Keeping a reference to the certificate from TLS session cache prevents this cleanup to happen (regardless whether user properly disposed of the certificate). The key file will then outlive the process it was created in. In scenarios with many short-lived processes which do mutually-authenticated HTTPS requests with such certificates will lead to accumulation of those files, potentially exhausting disk space.

Since we don't use the value of the certificate in any part of the code, only the knowledge whether one was used or not, we can replace the cert reference by a simple bool flag which does not extend the lifetime of the certificate.

Regression

Yes, introduced in .NET 8 in PR #79898.

Testing

Verified on the provided isolated repro from the original issue #101090.
E2E verification done by reporting customer via provided private bits.

Risk

Low, the issue is well understood and the fix is small and contained to affected code path (using client certificates on Windows).

rzikmand others added 2 commits April 16, 2024 21:06
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Tagging subscribers to this area: @dotnet/ncl, @bartonjs, @vcsjones
See info in area-owners.md if you want to be subscribed.

@rzikmrzikm changed the title [release/8.0-staging] Avoid rooting X509Certificate2 in SslSessionCache[release/8.0] Avoid rooting X509Certificate2 in SslSessionCacheApr 17, 2024
@rzikmrzikm self-assigned this Apr 17, 2024
@karelzkarelz added this to the 8.0.x milestone Apr 17, 2024
@rzikm
rzikm requested a review from wfurtApril 17, 2024 13:28
@rzikmrzikm added the Servicing-approved Approved for servicing release label Apr 18, 2024
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@rzikm
rzikm merged commit 0b84eae into release/8.0-stagingApr 23, 2024
@jkotas
jkotas deleted the backport/pr-101120-to-release/8.0-staging branch April 27, 2024 22:49
@rzikmrzikm modified the milestones: 8.0.x, 8.0.6May 16, 2024
@github-actionsgithub-actionsBot locked and limited conversation to collaborators Jun 15, 2024
@karelzkarelz modified the milestones: 8.0.6, 8.0.7Jun 25, 2024
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@rzikm@karelz@wfurt
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode"); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })();
Skip to content

[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache - #101144

Merged
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging
Apr 23, 2024
Merged

[release/8.0] Avoid rooting X509Certificate2 in SslSessionCache#101144
rzikm merged 2 commits into
release/8.0-stagingfrom
backport/pr-101120-to-release/8.0-staging

Conversation

@github-actions

@github-actionsgithub-actionsBot commented Apr 16, 2024

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Contributor

Backport of #101120 to release/8.0-staging

Fixes#101090

/cc @rzikm

Customer Impact

X509Certificates imported from PFX may be temporarily stored on disk. We extended their lifetime in .NET 8.0 (see details below) and they might not be deleted by the process. For short-lived processes, it may lead to disk space exhaustion.
Reported by a large service -- operating in environment with limited disk space and short-lived processes.

Technical details

PR #79898 fixed SslStream.IsMutuallyAuthenticated property for scenarios with TLS resumed sessions -- we found out that in some older windows versions we cannot reliably query whether the resumed session used a client certificate (important information for the property to be accurate). As a workaround, we added a reference to the X509Certificate instance on the record in the internal TLS session cache, which prolongs the lifetime of the X509Certificate.

X509Certificates constructed by importing PFX certificate have their keys stored in a key file on disk. Dispose() of the certificate is implemented such that the key file is cleaned up. Keeping a reference to the certificate from TLS session cache prevents this cleanup to happen (regardless whether user properly disposed of the certificate). The key file will then outlive the process it was created in. In scenarios with many short-lived processes which do mutually-authenticated HTTPS requests with such certificates will lead to accumulation of those files, potentially exhausting disk space.

Since we don't use the value of the certificate in any part of the code, only the knowledge whether one was used or not, we can replace the cert reference by a simple bool flag which does not extend the lifetime of the certificate.

Regression

Yes, introduced in .NET 8 in PR #79898.

Testing

Verified on the provided isolated repro from the original issue #101090.
E2E verification done by reporting customer via provided private bits.

Risk

Low, the issue is well understood and the fix is small and contained to affected code path (using client certificates on Windows).

rzikmand others added 2 commits April 16, 2024 21:06
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Tagging subscribers to this area: @dotnet/ncl, @bartonjs, @vcsjones
See info in area-owners.md if you want to be subscribed.

@rzikmrzikm changed the title [release/8.0-staging] Avoid rooting X509Certificate2 in SslSessionCache[release/8.0] Avoid rooting X509Certificate2 in SslSessionCacheApr 17, 2024
@rzikmrzikm self-assigned this Apr 17, 2024
@karelzkarelz added this to the 8.0.x milestone Apr 17, 2024
@rzikm
rzikm requested a review from wfurtApril 17, 2024 13:28
@rzikmrzikm added the Servicing-approved Approved for servicing release label Apr 18, 2024
@rzikm

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Approved via email

@rzikm
rzikm merged commit 0b84eae into release/8.0-stagingApr 23, 2024
@jkotas
jkotas deleted the backport/pr-101120-to-release/8.0-staging branch April 27, 2024 22:49
@rzikmrzikm modified the milestones: 8.0.x, 8.0.6May 16, 2024
@github-actionsgithub-actionsBot locked and limited conversation to collaborators Jun 15, 2024
@karelzkarelz modified the milestones: 8.0.6, 8.0.7Jun 25, 2024
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3 participants

@rzikm@karelz@wfurt