Bug 1824926 - curl with SFTP fails to verify known hosts entry for ECDSA keys
Summary: curl with SFTP fails to verify known hosts entry for ECDSA keys
Alias: None
Product: Fedora
Classification: Fedora
Component: curl
Version: 32
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Kamil Dudka
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2020-04-16 16:47 UTC by Anderson Sasaki
Modified: 2020-04-28 02:30 UTC (History)
5 users (show)

Fixed In Version: curl-7.69.1-3.fc33 curl-7.69.1-3.fc32
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2020-04-28 02:30:52 UTC
Type: Bug

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Github curl curl issues 5252 0 None closed curl with SFTP fails to verify ECDSA keys present in known hosts files 2020-04-22 13:13:47 UTC

Description Anderson Sasaki 2020-04-16 16:47:08 UTC
Description of problem:
When the server uses an ECDSA key, curl fails to verify it's entry in the known hosts file when accessing using SFTP.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:

1. Create an ECDSA key pair for the SSH server:

# ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''

2. Authorize the user key to access the SSH server (assuming the user has an RSA key):

$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

3. Add the entry to the known_hosts file

$ echo 'localhost $(cat "/etc/ssh/ssh_host_ecdsa_key.pub")' >> ~/.ssh/known_hosts

4. Create a file to download:

$ dd if=/dev/zero of=~/testfile bs=1M count=1

5. Restart SSH server

$ systemctl restart sshd

6. Download using curl and SFTP

$ curl -o ./sftp_file -u testuser: --key ~/.ssh/id_rsa \
  --pubkey ~/.ssh/id_rsa.pub sftp://localhost/home/$(whoami)/testfile

Actual results:
curl: (60) SSL peer certificate or SSH remote key was not OK

Expected results:
No errors and the file is downloaded correctly.

Additional info:
Using RSA, ED25519, or DSA keys no error is generated and the download is successful

Comment 1 Kamil Dudka 2020-04-17 15:40:24 UTC
Anderson, thank you for creating the pull request upstream!

Comment 2 Kamil Dudka 2020-04-18 06:31:10 UTC
upstream commit: https://github.com/curl/curl/commit/14bf7eb6

Comment 3 Kamil Dudka 2020-04-20 09:48:47 UTC
dist-git commit: https://src.fedoraproject.org/rpms/curl/c/6a752013

Comment 4 Fedora Update System 2020-04-20 10:21:08 UTC
FEDORA-2020-e763186d31 has been submitted as an update to Fedora 32. https://bodhi.fedoraproject.org/updates/FEDORA-2020-e763186d31

Comment 5 Fedora Update System 2020-04-20 16:18:49 UTC
FEDORA-2020-e763186d31 has been pushed to the Fedora 32 testing repository.
In short time you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2020-e763186d31`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2020-e763186d31

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2020-04-28 02:30:52 UTC
FEDORA-2020-e763186d31 has been pushed to the Fedora 32 stable repository.
If problem still persists, please make note of it in this bug report.

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