gemini/posts/2021-05-31+9front+tls+Part+2

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In my last post I covered 9front server side tls - now we begin the client side.
I found that most of the user space tls stuff is not *that* interesting or it's stuff for another post.
So, we'll jump right in to C
*Thinks back to earlier today*
orthanc% ./sha1sum -3 256 /amd64/9pc64
sha1sum 238299: suicide: sys: trap: fault write addr=0x0 pc=0x00006afb
*screams*
Ok, but thats for the next post. Back to tls. This is scary easy stuff.
"dial" your server
int fd = dial("tcp!server!port")
Create a tls connection, this lets you seek for info on your connection (say, certs)
conn = (TLSconn*)mallocz(sizeof *conn, 1);
start the tls "pipe"
fd = tlsClient(fd, conn);
Now you can read and write using that fd like you would on the server side, but you should check those certs
if(!okCertificate(conn->cert, conn->certlen, table))
sysfatal("suspect server: %r");
I do know that there is no real CA validation as of now, I may work on fixing that.
Ok, that's all I have for now, see you next post.
--
Fulton