Camera failed to work because current user is missing permission

[jcmartinez]

When connecting an OGMA camera, we get an error indicating that the camera failed to start and that INDI can't control the temperature.

This affects indi_ogmacam_ccd and probably it also affects indi_toupcam_ccd

To Reproduce
Exact steps to reproduce the behavior.

1. Run KStars
2. Select a profile that uses Camera = OGMACam (or Toupcam)
3. Click Connect
4. In the INDI Control Panel, under the Tab OGMAVision (or Toupcam), click Connect
5. You will see in the logs:
   2023-06-12T21:46:56: [ERROR] get Temperature error. Permission denied
   2023-06-12T21:46:55: [ERROR] get Temperature error. Permission denied
   2023-06-12T21:46:54: [ERROR] Failed to start camera. Permission denied
   2023-06-12T21:46:54: [INFO] OGMAVision AP26MC connect

Expected behavior
The camera should start and the temperature should be detected.

**Desktop

This has been detected in the following system:

• INDI installed on Ubuntu desktop on a PC following https://github.com/avarakin/AstroPiMaker4

Log Files
log_18-05-27.zip

[jcmartinez]

Linux Audit produced logs indicating that the current user that's executing /usr/bin/indi_ogmacam_ccd doesn't have file permission to write to the USB device. This explains why the camera is detected, but no configurations or commands can be sent to the camera.

These are the logs from Linux Audit:

type=SYSCALL msg=audit(1686765633.743:357): arch=c000003e syscall=257 success=no exit=-13 a0=ffffff9c a1=7ffea6d64f20 a2=80002 a3=0 items=1 ppid=5825 pid=5827 auid=1000 uid=1000 gid=1000 euid=1000 suid=1000 fsuid=1000 egid=1000 sgid=1000 fsgid=1000 tty=(none) ses=2 comm="indi_ogmacam_cc" exe="/usr/bin/indi_ogmacam_ccd" subj=unconfined key="access"ARCH=x86_64 SYSCALL=openat AUID="jc" UID="jc" GID="jc" EUID="jc" SUID="jc" FSUID="jc" EGID="jc" SGID="jc" FSGID="jc"
type=CWD msg=audit(1686765633.743:357): cwd="/home/jc"
type=PATH msg=audit(1686765633.743:357): item=0 name="/dev/bus/usb/002/002" inode=733 dev=00:05 mode=020664 ouid=0 ogid=0 rdev=bd:81 nametype=NORMAL cap_fp=0 cap_fi=0 cap_fe=0 cap_fver=0 cap_frootid=0OUID="root" OGID="root"
type=PROCTITLE msg=audit(1686765633.743:357): proctitle="indi_ogmacam_ccd"

Listing my USB devices I can see the location of the camera:

$ sudo lsusb
Bus 002 Device 002: ID 9745:9428 TP AP26MC

Listing permissions I can see that other users don't have write permission:

$ sudo ls -la /dev/bus/usb/002/002

crw-rw-r-- 1 root root 189, 129 Jun 14 14:25 /dev/bus/usb/002/002

After adding write permission to others, everything works fine:

$ sudo chmod o+w /dev/bus/usb/002/002

$ sudo ls -la /dev/bus/usb/002/002

crw-rw-rw- 1 root root 189, 129 Jun 14 13:37 /dev/bus/usb/002/002

[ckuethe]

Seems like https://github.com/indilib/indi-3rdparty/blob/master/libogmacam/99-ogmacam.rules is missing an entry for vendor 0x9745.

Try add it to the an appropriate rules file in /etc/udev/rules.d so that udev will set permissions properly.

[knro]

The missing VID was added already.