Welcome to the Linux Foundation Forum!
Need to call chroot under normal unprevileged user
gazolinia
Posts: 5
Its been last two days over after my search started . But I didn't find answer any where ?. I need to call chroot as part of normal user, but to my surprise it can only be called by SUper user with CAP_SYS_CHROOT capabilities. I am not sure how to add this capability to my user . Please help me in solving my situation.
0
Comments
-
You are correct that chroot can only be called by the root user, this is because of potential security risks relating to privileged escalation inside the chrooted container, please read http://en.wikipedia.org/wiki/Chroot.
However depending on what exactly you are trying to accomplish it may be possible to restrict users inside a chrooted contained by using daemon application settings or it may even be better to refine the user rights and leave them inside the standard filesystem.
Please tell us what exactly you are trying to do and we can offer our recommendation for properly securing the user actions.0 -
Hi,
Thanks for your immediate reponse. My only requirement is I call chroot from a perl script . This perl script needs to run under normal user . I am using grsecurity to avoid double chroot and breaking of chroot issues. Currently the point where I stand is I must run the perl script under un previleged user, but it should do chroot. Seems little wierd right , but this is what my application requires now . Adding capablility CAP_SYS_CHROOT to the normal user I guess must solve my requirement. But I am not sure how to add this capablity to my user.
Hope you got my requirements.
Thanks
Jai0 -
I must work now, I will research this item more when I get home this evening. Hopefully someone else can chime in with an answer before I return.0
-
Part of the problem, besides the need to run chroot as root user is the fact that the directory that is the new root directory must contain all the commands, files, libraries that will be needed during the time chroot is in process. Please provide some rationale why you think you need to do a chroot in your perl script. What exactly are you trying to accomplish?0
-
Hi,
My requirement is simple, Apache receives request and calls my perl handler. The handler script needs to identify which script it needs to run and based on this it needs to go to the particular chroot jail and run the script securely, btw it prints the output to response. We have this new roots already created with necessary libraries and binaries. Hope you got my req .
Thanks,
Jai0 -
Jaya,
Just how many forums have you posted this question to, anyway? I know of at least 3 or 4. The fact of the matter is, to do what you want is a gross violation of system security. You can set up the user's login to do a chroot when they first login to the system, but to allow something like a perl script the ability to do a chroot is just plain dangerous! Maybe if you described what your REAL problem is, we could make some suggestions on how to accomplish your real goals.0 -
Hi,
Desperation to find answer made me to post in different forums . But this is the thing finally required, I need to add CAP_SYS_CHROOT capability to my user, because only users with CAP_SYS_CHROOT can call chroot. This will solve all my requirements . I guess I am making things look tough by saying all unwanted details.
Thanks,
Jai0 -
HI finally we planned to over write the chroot method through LKM , guessing that will solve our problem.0
Categories
- All Categories
- 51 LFX Mentorship
- 104 LFX Mentorship: Linux Kernel
- 576 Linux Foundation IT Professional Programs
- 304 Cloud Engineer IT Professional Program
- 125 Advanced Cloud Engineer IT Professional Program
- 53 DevOps Engineer IT Professional Program
- 61 Cloud Native Developer IT Professional Program
- 6 Express Training Courses
- 6 Express Courses - Discussion Forum
- 2.1K Training Courses
- 19 LFC110 Class Forum
- 7 LFC131 Class Forum
- 27 LFD102 Class Forum
- 158 LFD103 Class Forum
- 21 LFD121 Class Forum
- 2 LFD137 Class Forum
- 61 LFD201 Class Forum
- 1 LFD210 Class Forum
- LFD210-CN Class Forum
- 1 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum
- LFD237 Class Forum
- 23 LFD254 Class Forum
- 613 LFD259 Class Forum
- 105 LFD272 Class Forum
- 1 LFD272-JP クラス フォーラム
- 1 LFD273 Class Forum
- 2 LFS145 Class Forum
- 25 LFS200 Class Forum
- 739 LFS201 Class Forum
- 1 LFS201-JP クラス フォーラム
- 11 LFS203 Class Forum
- 77 LFS207 Class Forum
- 300 LFS211 Class Forum
- 54 LFS216 Class Forum
- 47 LFS241 Class Forum
- 41 LFS242 Class Forum
- 37 LFS243 Class Forum
- 11 LFS244 Class Forum
- 37 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 141 LFS253 Class Forum
- LFS254 Class Forum
- 1.1K LFS258 Class Forum
- 10 LFS258-JP クラス フォーラム
- 93 LFS260 Class Forum
- 132 LFS261 Class Forum
- 33 LFS262 Class Forum
- 80 LFS263 Class Forum
- 15 LFS264 Class Forum
- 11 LFS266 Class Forum
- 18 LFS267 Class Forum
- 18 LFS268 Class Forum
- 23 LFS269 Class Forum
- 203 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- LFS274 Class Forum
- LFS281 Class Forum
- 236 LFW211 Class Forum
- 172 LFW212 Class Forum
- 7 SKF100 Class Forum
- SKF200 Class Forum
- 903 Hardware
- 219 Drivers
- 74 I/O Devices
- 44 Monitors
- 116 Multimedia
- 209 Networking
- 101 Printers & Scanners
- 85 Storage
- 763 Linux Distributions
- 88 Debian
- 66 Fedora
- 15 Linux Mint
- 13 Mageia
- 24 openSUSE
- 142 Red Hat Enterprise
- 33 Slackware
- 13 SUSE Enterprise
- 357 Ubuntu
- 479 Linux System Administration
- 41 Cloud Computing
- 70 Command Line/Scripting
- Github systems admin projects
- 95 Linux Security
- 78 Network Management
- 108 System Management
- 49 Web Management
- 68 Mobile Computing
- 23 Android
- 30 Development
- 1.2K New to Linux
- 1.1K Getting Started with Linux
- 538 Off Topic
- 131 Introductions
- 217 Small Talk
- 22 Study Material
- 826 Programming and Development
- 278 Kernel Development
- 514 Software Development
- 928 Software
- 260 Applications
- 184 Command Line
- 3 Compiling/Installing
- 76 Games
- 316 Installation
- 61 All In Program
- 61 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)