Category Archives: Security

Linux: Disk recovery with ddrescue

Hi

‘ddrescue –direct’ will open the input with the O_DIRECT option for uncached reads. ‘raw devices’ are not needed on newer kernels. For older kernels see below.
Continue reading Linux: Disk recovery with ddrescue

Advertisment to support michlstechblog.info

openssl: Show all certificates of a certificate bundle file

Hi,

the x509 option of openssl does only use the first certificate in a file.
Continue reading openssl: Show all certificates of a certificate bundle file

openssl: Establish a http connect behind a proxy

Hi,

since openssl 1.1.0 it is possible to establish a HTTPs CONNECT connection to a (Web)server behind a http proxy.

Continue reading openssl: Establish a http connect behind a proxy

openssl: Verifiy failed with error 3 at 0 depth lookup: unable to get certificate CRL

Hi,

openssl can verify certificates against the root CA/intermediate CA chain and also can check a crl list if a certificate is revoked.
Continue reading openssl: Verifiy failed with error 3 at 0 depth lookup: unable to get certificate CRL

Linux: Place own/custom certificates in /etc/ssl/certs

Hi,

sometimes it is necessary to add an own root/intermediate CA top your machine CA store.

Continue reading Linux: Place own/custom certificates in /etc/ssl/certs