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ftp,imap,pop3: do not ignore --ssl-reqd

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In imap and pop3, check if TLS is required even when capabilities
request has failed.

In ftp, ignore preauthentication (230 status of server greeting) if TLS
is required.

Bug: https://curl.se/docs/CVE-2021-22946.html

CVE-2021-22946
This commit is contained in:
Patrick Monnerat 2021-09-08 11:56:22 +02:00 • committed by Daniel Stenberg
parent 43157490a5
commit 364f174724
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GPG key ID: 5CC908FDB71E12C2
7 changed files with 195 additions and 36 deletions
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9
lib/ftp.c
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@ -2681,9 +2681,12 @@ static CURLcode ftp_statemachine(struct Curl_easy *data,
/* we have now received a full FTP server response */
switch(ftpc->state) {
case FTP_WAIT220:
if(ftpcode == 230)
/* 230 User logged in - already! */
return ftp_state_user_resp(data, ftpcode, ftpc->state);
if(ftpcode == 230) {
/* 230 User logged in - already! Take as 220 if TLS required. */
if(data->set.use_ssl <= CURLUSESSL_TRY ||
conn->bits.ftp_use_control_ssl)
return ftp_state_user_resp(data, ftpcode, ftpc->state);
}
else if(ftpcode != 220) {
failf(data, "Got a %03d ftp-server response when 220 was expected",
ftpcode);