Knowing someone through someone else

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Dear life

Senior Member
India- Bengali
Could you please tell me how I can express the idea of making acquaintance of someone through someone else? For example, A knows B; now C is B 's friend. So, it's only through B that A knows C. I guess, I can better illustrate it through a conversation:
D: Hi A! I met someone awesome last evening.
A: Who's that?
D: He is C.
A: Oh! I know him! He is really such a nice guy!
D: How do you know him?
A: Actually, we are not that close. C is B's friend. I saw C at B's party. We had a conversation. It was nice talking to him.

This is the way A knows C. They are not acquainted directly, but through someone else.
Is there an expression for it?
Please help!
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