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gmnlm: host freed too early, causing UAF

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The host variable is freed too early. If a client certificate is not
found, the later error message in the
GEMINI_STATUS_CLASS_CLIENT_CERTIFICATE_REQUIRED case uses the freed host
variable to produce an incorrect openssl command. This fix just delays
the free to after the switch statement.

Test case:
gmnlm gemini://feeds.drewdevault.com

Prior:
The following OpenSSL command will generate a certificate for this host:

openssl req -x509 -newkey rsa:4096 \
 -keyout /home/andrew/.local/share/gmni/certs/€Ú-=öU.key \
 -out /home/andrew/.local/share/gmni/certs/€Ú-=öU.crt \
 -days 36500 -nodes

Now:
The following OpenSSL command will generate a certificate for this host:

openssl req -x509 -newkey rsa:4096 \
-keyout /home/andrew/.local/share/gmni/certs/feeds.drewdevault.com.key \
-out /home/andrew/.local/share/gmni/certs/feeds.drewdevault.com.crt \
-days 36500 -nodes
This commit is contained in:
Andrew 2021-06-10 07:36:37 -04:00 committed by Drew DeVault
parent e0993d4886
commit b46b312817
1 changed files with 1 additions and 1 deletions
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2
src/gmnlm.c
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@ -415,7 +415,6 @@ do_requests(struct browser *browser, struct gemini_response *resp)
} else {
browser->opts.client_cert = NULL;
}
free(host);
}
while (requesting) {
@ -540,6 +539,7 @@ out:
free(client_cert.key);
}
free(scheme);
free(host);
return res;
}