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From: Mimi Zohar <zohar@linux.ibm.com>
To: Vitaly Chikunov <vt@altlinux.org>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
	linux-integrity@vger.kernel.org,
	"Dmitry V. Levin" <ldv@altlinux.org>
Subject: Re: [PATCH v6 1/3] ima-evm-utils: Allow manual setting keyid for signing
Date: Wed, 30 Jun 2021 12:39:02 -0400	[thread overview]
Message-ID: <2f494e1d5c2c99a4b7c0912faa4c3be3de682afc.camel@linux.ibm.com> (raw)
In-Reply-To: <20210629013201.xelhje2hmiuqybrt@altlinux.org>

Hi Vitaly,

On Tue, 2021-06-29 at 04:32 +0300, Vitaly Chikunov wrote:
> Mimi,
> 
> On Mon, Jun 28, 2021 at 04:50:42PM -0400, Mimi Zohar wrote:
> > 
> > Thank you for the detailed explanation.
> > 
> > On Sat, 2021-06-26 at 03:42 +0300, Vitaly Chikunov wrote:
> > 
> > > > Requiring the optarg value to be prefixed with "0x" would
> > > > simplify the strlen test.
> > > > (The subsequent patch wouldn't need a contrived prefix.)
> > > 
> > > (I do not understand this remark at the moment.)
> > > 
> > > Base 16 will let user pass keyid just as a string, copy-pasting from
> > > somewhere else.
> > 
> > strtoul() supports prefixing the ascii-hex string with "0x".  To
> > differentiate between a keyid and pathname, why not require the keyid
> > be prefixed with "0x", as opposed to requiring the pathname to be
> > prefixed with '@', like "--keyid @/path/to/cert.pem".
> 
> I wanted to avoid (filename vs keyid) ambiguity of the argument to
> `--keyid' - if user have file named "0x00112233" they would have hard
> time passing it to `--keyid'. But, it's impossible to have keyid string
> starting with "@". So, "@" perfectly distinguish type of `--keyid'
> argument but "0x" isn't.
> 
> Also, in some software (zip, rar) "@" is common prefix meaning value
> should be taken from the specified file. But, yes, "@" is not common
> in Unix environments. Do you want me to create separate option like
> `--keyid-from-file'?

It's highly unlikely that both the filename and pathname would be
prefixed with "0x".  Defining a new option might be a good idea. 
Possibly naming it --extract-cert-keyid,  ---cert-keyid, or --keyid-
from-cert.  

thanks,

Mimi


  reply	other threads:[~2021-06-30 16:39 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-11 11:56 [PATCH v6 0/3] ima-evm-utils: Add --keyid option Vitaly Chikunov
2021-05-11 11:56 ` [PATCH v6 1/3] ima-evm-utils: Allow manual setting keyid for signing Vitaly Chikunov
2021-06-25 12:21   ` Mimi Zohar
2021-06-26  0:42     ` Vitaly Chikunov
2021-06-28 20:50       ` Mimi Zohar
2021-06-29  1:32         ` Vitaly Chikunov
2021-06-30 16:39           ` Mimi Zohar [this message]
2021-06-30 19:44             ` Vitaly Chikunov
2021-06-30 20:47               ` Mimi Zohar
2021-06-30 21:10                 ` Vitaly Chikunov
2021-06-30 21:32                   ` Mimi Zohar
2021-05-11 11:56 ` [PATCH v6 2/3] ima-evm-utils: Allow manual setting keyid from a cert file Vitaly Chikunov
2021-06-25 12:22   ` Mimi Zohar
2021-06-26  0:27     ` Vitaly Chikunov
2021-06-30 16:39       ` Mimi Zohar
2021-05-11 11:56 ` [PATCH v6 3/3] ima-evm-utils: Read keyid from the cert appended to the key file Vitaly Chikunov
2021-06-25 12:22   ` Mimi Zohar
2021-06-26  0:21     ` Vitaly Chikunov
2021-06-30 17:38   ` Mimi Zohar
2021-06-30 19:10     ` Vitaly Chikunov
2021-06-30 19:26       ` Vitaly Chikunov

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