Please help me in below query
Can we automate jira login (SSO) with crowd without using any other plugin's ?
It depends on what you mean by "automate JIRA login". If you mean that your users should not have to enter any credentials to log onto Jira, you will actually need a Kerberos plugin such as IWAAC (Integrated Windows Authentication for Apps using Crowd): https://marketplace.atlassian.com/plugins/com.cleito.iwaac/server/overview
(Disclaimer: I work at the vendor of the IWAAC plugin. You might also want to have a look at other Kerberos plugins on the Atlassian Marketplace: https://marketplace.atlassian.com/search?q=kerberos)
Basically, no, you need add-ons or code change to enable SSO variants. Ideally, stick to well maintained and well known add-ons such as the one Bruno mentions.
Crowd only supports Cookie-based SSO. Once you login through Crowd, you won't have to log in again until you expire.
Anything else requires custom code or plugins.
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