Mac OS 10.15 and above had very tight controls on what can run in user space. Areas are designated off limits and blocked for security reasons. According to apple. OS X 11 is worse.
K. > On 1 Jul 2020, at 20:13, Grant Taylor via cctalk <cctalk@classiccmp.org> > wrote: > > On 6/28/20 6:48 PM, Grant Taylor wrote: >> Does anyone have any experience with UUCP on macOS or *BSD systems that >> would be willing to help me figure something out? > > I ended up getting this to work. > > I don't know if it was a macOSism or a *BSDism, but the root of the problem > was crossing between users via setuid / setgid in relation to OpenSSH. > > Two different versions of macOS behaved differently. > > macOS Yosemite 10.10.5 runs the underlying ssh pipe command as the user > account that initiates the uucp / uuto / uux. > > macOS Catalina 10.15.15 runs the underlying ssh pipe command as the _uucp > user, NOT the account that initiates the uucp / uuto / uux. > > As such, on macOS Yosemite 10.10.5, I have to have the normal user's ssh > public key in the authorized_keys file on the remote system. > > Conversely, on macOS Catalina 10.15.15, I have to have the _uucp user's ssh > public key in the authorized_keys file on the remote system. > > I don't know why macOS Yosemite 10.10.5 and macOS Catalina 10.15.15 are > behaving differently, but they are. > > These inconsistencies made identifying which client ssh config file -- > nominally ~/.ssh/config -- was used cumbersome. > > For some unknown reason, I couldn't rely on "~/" or defaults to specify the > _uucp user's key (Identity) file or the known_hosts file on macOS Catalina > 10.15.15, despite the fact that it was running as the _uucp user. I ended up > having to hard code the paths, as they were defaulting to the original user > account that initiated the uucp / uuto / uux. > > I can only surmise that something is fundamentally different between Linux > and macOS in how it does things when changing user accounts via setuid & > setgid as I did not have any of these problems on multiple Linux machines. I > can further surmise that something is different between macOS Yosemite > 10.10.5 and macOS Catalina 10.15.15. I don't know if this is related to > System Integrity Protection or something else. > > > > -- > Grant. . . . > unix || die > > > > > > -- > Grant. . . . > unix || die
