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Invalid signature in a SAML Authentication Request
Article ID: 197116
Updated On:
Products
CA Single Sign On Secure Proxy Server (SiteMinder)
CA Single Sign On Agents (SiteMinder)
CA Single Sign On Federation (SiteMinder)
CA Single Sign On SOA Security Manager (SiteMinder)
SITEMINDER
Issue/Introduction
We're running a Policy Server in Federated environment, and when the
Policy Server receives a SAMLRequest, it cannot validate the signature
and it reports error :
Invalid signature.
How can we fix that ?
Cause
Take the Fiddler traces and get the full URL and SAMLRequest value to
validate it with third-party site as shown in the following sample.
If we try to validate the AuthnRequest outside the Policy Server with
a tool on the internet, we get the same result.
https://www.samltool.com/validate_authn_req.php
The URL containing the SAMLRequest is :
https://myfed.mydomain.com/affwebservices/public/saml2sso?SAMLRequest=fZHLasMwEEV%2FxWgvW36SdwwsssSdsdw251ssmuR06bv6%2FsQEkX7fYyV%2BcetEFhhpFvZ3%2B2r%2FAxA%2Fqo2zXkwFha5VDntE5rRVPoBRW5YrQuszyFspaFKEj0BhNqZxuSxYxEHeIMnUUvrA8RyxhlJWXVMWU8Z7zM3km0CwRthV9bZ%2B9H5EmCnqIRRiroY7A61j4RSn3CCWG6aAmYjPNp0DJZ1maIjkQPbpKwzm6IEgPCgt8LRH2Bn%2BTLDBb5qtiQebLcCdTIrTCA3Et%2B2D4%2F8TCdj5PzTrqBtJvlmq8m013%2F%2F3rAwrQokfbxeNwfgpK55kVV5QUNa2M5mdjZHoywfSyd2SR3lBty5C%2Fh2W63d8HzuugZ4f%2BmpnG6Jrqnaj3ls8URpFYaepK0N8Lvj22%2FAQ%3D%3D&RelayState=idjjjfosdksdtozrzforedaoatfqozvstrevzcuau&SigAlg=http%3A%2F%2Fwww.w3.org%2F2000%2F09%2Fxmldsig%23rsa-sha1&Signature=MIICPQYJKoZIhvcNAQcCoIICLjCCAioCAQSdsdcsERfsFsadwqGdsfgdfGdfDFSDSFDeSDFdsfededDDgEBMIGCMHYxCzAJBgNVBAYTAkRFMRwwGgYDVQQKExNTQVAgVHJ1c3QgQ29tbXVuaXR5MS8wLQYDVQQLEyZJMDAwMDAwMDAwNzQwOTg2NDYyIC0gQnVzaW5lc3NCeURlc2lnbjEYMBYGA1UEAwwPU0FQX0JZRF9TQU1MMl9TAggKIBkGKBJHATAJBgUrDgMCGgUAoF0wGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMjAwNTA2MTAzMDUyWjAjBgkqhkiG9w0BCQQxFgQUxws1W4s5ld0ak8y8GOHi7Gr9fxwwDQYJKoZIhvcNAQEBBQAEggEAnt0sKOJQ%2FR4VRn6lVNADWeRlHyq0cnQEqFeLimB2gIReYFaHymCs1MYnPbNz7Yhi7WpoTPLe%2B1Mn%2BA38n%2Fbfesxh0q15k%2Bbr9gw71w5YT7LjmmMYdF%2BJJK9gYlKQDR4s8ZQD%2F%2Bu74cZDbecPwnYFketMAwlPeK%2FAqwTRmEp0Zl91zMbJFgm1lnBfQGU%2FCtAeenlJV6q7nRZMOQrYp4hTh4Qzo3gwE%2BSvs5vGLn4Qv5P%2BYU8f5upwuXHh35Q95qQd1NU771D2tBibqob5m6kO70gCJZDW8iil9FJzCZJRWJ6337%2BI%2BpvpMSNrBtxhFn7g9XrSv6BEyQ59bR5mTnK2Uw%3D%3D
The SAMLRequest is :
fZHLasMwEEV%2FxWgvW36SdwwsssSdsdw251ssmuR06bv6%2FsQEkX7fYyV%2BcetEFhhpFvZ3%2B2r%2FAxA%2Fqo2zXkwFha5VDntE5rRVPoBRW5YrQuszyFspaFKEj0BhNqZxuSxYxEHeIMnUUvrA8RyxhlJWXVMWU8Z7zM3km0CwRthV9bZ%2B9H5EmCnqIRRiroY7A61j4RSn3CCWG6aAmYjPNp0DJZ1maIjkQPbpKwzm6IEgPCgt8LRH2Bn%2BTLDBb5qtiQebLcCdTIrTCA3Et%2B2D4%2F8TCdj5PzTrqBtJvlmq8m013%2F%2F3rAwrQokfbxeNwfgpK55kVV5QUNa2M5mdjZHoywfSyd2SR3lBty5C%2Fh2W63d8HzuugZ4f%2BmpnG6Jrqnaj3ls8URpFYaepK0N8Lvj22%2FAQ%3D%3D&RelayState=idjjjfosdksdtozrzforedaoatfqozvstrevzcuau&SigAlg=http%3A%2F%2Fwww.w3.org%2F2000%2F09%2Fxmldsig%23rsa-sha1&Signature=MIICPQYJKoZIhvcNAQcCoIICLjCCAioCAQSdsdcsERfsFsadwqGdsfgdfGdfDFSDSFDeSDFdsfededDDgEBMIGCMHYxCzAJBgNVBAYTAkRFMRwwGgYDVQQKExNTQVAgVHJ1c3QgQ29tbXVuaXR5MS8wLQYDVQQLEyZJMDAwMDAwMDAwNzQwOTg2NDYyIC0gQnVzaW5lc3NCeURlc2lnbjEYMBYGA1UEAwwPU0FQX0JZRF9TQU1MMl9TAggKIBkGKBJHATAJBgUrDgMCGgUAoF0wGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMjAwNTA2MTAzMDUyWjAjBgkqhkiG9w0BCQQxFgQUxws1W4s5ld0ak8y8GOHi7Gr9fxwwDQYJKoZIhvcNAQEBBQAEggEAnt0sKOJQ%2FR4VRn6lVNADWeRlHyq0cnQEqFeLimB2gIReYFaHymCs1MYnPbNz7Yhi7WpoTPLe%2B1Mn%2BA38n%2Fbfesxh0q15k%2Bbr9gw71w5YT7LjmmMYdF%2BJJK9gYlKQDR4s8ZQD%2F%2Bu74cZDbecPwnYFketMAwlPeK%2FAqwTRmEp0Zl91zMbJFgm1lnBfQGU%2FCtAeenlJV6q7nRZMOQrYp4hTh4Qzo3gwE%2BSvs5vGLn4Qv5P%2BYU8f5upwuXHh35Q95qQd1NU771D2tBibqob5m6kO70gCJZDW8iil9FJzCZJRWJ6337%2BI%2BpvpMSNrBtxhFn7g9XrSv6BEyQ59bR5mTnK2Uw%3D%3D
Url decoded :
fZHLasMwEEV/xWgvW36SdwwsssSdsdw251ssmuR06bv6/sQEkX7fYyV+cetEFhhpFvZ3+2r/AxA/qo2zXkwFha5VDntE5rRVPoBRW5YrQuszyFspaFKEj0BhNqZxuSxYxEHeIMnUUvrA8RyxhlJWXVMWU8Z7zM3km0CwRthV9bZ+9H5EmCnqIRRiroY7A61j4RSn3CCWG6aAmYjPNp0DJZ1maIjkQPbpKwzm6IEgPCgt8LRH2Bn+TLDBb5qtiQebLcCdTIrTCA3Et+2D4/8TCdj5PzTrqBtJvlmq8m013//3rAwrQokfbxeNwfgpK55kVV5QUNa2M5mdjZHoywfSyd2SR3lBty5C/h2W63d8HzuugZ4f+mpnG6Jrqnaj3ls8URpFYaepK0N8Lvj22/AQ==&RelayState=idjjjfosdksdtozrzforedaoatfqozvstrevzcuau&SigAlg=http://www.w3.org/2000/09/xmldsig#rsa-sha1&Signature=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
https://www.samltool.com/decode.php
<samlp:AuthnRequest ID="S00163e93-919f-1eda-a3f0-95231e59c4a4" Version="2.0" IssueInstant="2020-05-06T10:30:52Z" Destination="https://myfed.mydomain.com/affwebservices/public/saml2sso" ForceAuthn="false" IsPassive="false" xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"><saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">HTTPS://mysp.myspdomain.com</saml:Issuer><samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified"/></samlp:AuthnRequest>
SP EntityId
HTTPS://mysp.myspdomain.com
Target URL, Destination of the AuthN Request
https://myfed.mydomain.com/affwebservices/public/saml2sso
AuthnRequest :
fZHLasMwEEV/xWgvW36SdwwsssSdsdw251ssmuR06bv6/sQEkX7fYyV+cetEFhhpFvZ3+2r/AxA/qo2zXkwFha5VDntE5rRVPoBRW5YrQuszyFspaFKEj0BhNqZxuSxYxEHeIMnUUvrA8RyxhlJWXVMWU8Z7zM3km0CwRthV9bZ+9H5EmCnqIRRiroY7A61j4RSn3CCWG6aAmYjPNp0DJZ1maIjkQPbpKwzm6IEgPCgt8LRH2Bn+TLDBb5qtiQebLcCdTIrTCA3Et+2D4/8TCdj5PzTrqBtJvlmq8m013//3rAwrQokfbxeNwfgpK55kVV5QUNa2M5mdjZHoywfSyd2SR3lBty5C/h2W63d8HzuugZ4f+mpnG6Jrqnaj3ls8URpFYaepK0N8Lvj22/AQ==
RelayState :
idjjjfosdksdtozrzforedaoatfqozvstrevzcuau
Signature Alogrithm :
http://www.w3.org/2000/09/xmldsig#rsa-sha1
Signature
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
Certificate used to sign :
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
Checked "Ignore timing issue"
>>
THE SAML AUTHN REQUEST IS INVALID.
Signature validation failed. AuthN Request rejected
Environment
Web Agent 12.52 64bit on Apache 2.2.29 64bit on Suse 11SP4;
Web Agent Option Pack 12.52 64bit on WebLogic 10.3.6 on Suse 11SP4;
Policy Server 12.8SP2 on RedHat 7;
JDK 1.8 64bit;
Resolution
Review how the SP side is building the AuthnRequest and sign it. This
may be caused by a change in the assertion once it has already signed
in the post processing.
Feedback
Yes
No
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