01-26-2018
Hmmmm........this is not easy to do but not too difficult either. Let me elaborate.
There's no standard way of achieving this with access rights, group rights, or different user setup.
What version of Solaris are we talking?
However, you can create a special read-only shell, a new mountpoint lower in the filesystem, and remount '/' on that mountpoint. A specially created userid can then login and be given a read-only shell and access to '/' remounted as read-only.
Look at this:
LNXHC: HowTo Create a read-only user (Solaris 10) - BigAdmin - wikis.sun.com
It depends whether you want to go to this amount of modification to achieve it.
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LEARN ABOUT DEBIAN
mount.crypto_luks
mount.crypt(8) pam_mount mount.crypt(8)
Name
mount.crypt - mount a dm-crypt encrypted volume
Syntax
mount.crypt [-nrv] [-o options] device directory
Options
-o options
Set further mount options. mount.crypt will take out its own options it recognizes and passes any remaining options on to the under-
lying mount program. See below for possible options.
-n Do not update /etc/mtab. Note that this makes it impossible to unmount the volume by naming the container - you will have to pass
the mountpoint to umount.crypt.
-r Set up the loop device (if necessary) and crypto device in read-only mode. (The mount itself will necessarily also be read-only.)
Note that doing a remount using `mount /mnt -o remount,rw` will not make the mount readwrite. The crypto and loop devices will have
to be disassociated first.
-v Turn on debugging and be a bit more verbose.
Mount options
cipher The cryptsetup cipher used for the encrypted volume. This option is mandatory for PLAIN (non-LUKS) volumes. pmt-ehd(8) defaults to
creating volumes with "aes-cbc-essiv:sha256" as a cipher.
crypto_name
Select the name for the crypto device (optional). This option is currently only usable with dm-crypt systems.
fsck Run fsck on the container before mounting it.
fsk_cipher
The OpenSSL cipher used for the filesystem key. The special keyword "none" can be used to bypass decryption and pass the file con-
tents directly to libcryptsetup.
fsk_hash
The OpenSSL hash used for producing key and IV.
fstype The exact type of filesystem in the encrypted container. The default is to let the kernel autodetect.
hash The cryptsetup hash used for the encrypted volume. This defaults to no hashing, because pam_mount assumes EHD volumes with strong
and simple fskey generation.
keyfile
The path to the key file. This option is mandatory for "normal" crypto volumes and should not be used for LUKS volumes.
remount
Causes the filesystem to be remounted with new options. Note that mount.crypt cannot switch the underlying loop device (if applies)
or the crypto device between read-only and read-write once it is created; only the actual filesystem mount can be changed, with lim-
its. If the loop device is read-only, the crypto device will be read-only, and changing the mount to read-write is impossible. Sim-
ilarly, going from rw to ro will only mark the mount read-only, but not the crypto or loop device, thus making it impossible to set
the filesystem the crypto container is located on to read-only.
ro Same as the -r option.
verbose
Same as the -v option.
Obsolete mount options
This section is provided for reference.
loop This option used to set up a loop device, because cryptsetup(8) expects a block device. The option is ignored because mount.crypt
can figure this out on its own.
pam_mount 2011-12-15 mount.crypt(8)