From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E80E7C433FE for ; Wed, 30 Nov 2022 07:01:49 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4NMVW01BZtz3bdQ for ; Wed, 30 Nov 2022 18:01:48 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=cu9WFT5Y; dkim=fail reason="signature verification failed" header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=EJGHKBcc; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=suse.de (client-ip=195.135.220.28; helo=smtp-out1.suse.de; envelope-from=hare@suse.de; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa header.b=cu9WFT5Y; dkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519 header.b=EJGHKBcc; dkim-atps=neutral Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4NMVTx6WpNz2xZ7 for ; Wed, 30 Nov 2022 18:00:53 +1100 (AEDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id A2EF121B14; Wed, 30 Nov 2022 07:00:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1669791643; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IHFFLaG042AloMIZvZwg14/Qaz6Gth7+htGeg8xKFvQ=; b=cu9WFT5YRSZYuXRBwdBJDukS2C2yHAXQ8NYsfzz7zCMSu0RfMASSF94jPY57KM7YS2/v3+ 4R8umgNe8YOydkodH1ie1PGOIWLCxEFKMQ9w05oYbzwkgt2ThJjTRsa3pJ6a5cM41E3L/D 5RieLp2rgzzqe4Sy3LUFVY95uLSPyHU= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1669791643; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IHFFLaG042AloMIZvZwg14/Qaz6Gth7+htGeg8xKFvQ=; b=EJGHKBcc1YNgJaOuQR4zbbxoawFl/VMZn9w1tvPP3gc3EgRLxTe1gSpba+WzblIpe9qCv2 qSLaD1UIrs6SD9BQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 68D9213A70; Wed, 30 Nov 2022 07:00:43 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id q1HaGJv/hmN5FwAAMHmgww (envelope-from ); Wed, 30 Nov 2022 07:00:43 +0000 Message-ID: Date: Wed, 30 Nov 2022 08:00:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: [PATCH v3 3/3] block: sed-opal: keyring support for SED keys Content-Language: en-US To: gjoyce@linux.vnet.ibm.com, linux-block@vger.kernel.org References: <20221129232506.3735672-1-gjoyce@linux.vnet.ibm.com> <20221129232506.3735672-4-gjoyce@linux.vnet.ibm.com> From: Hannes Reinecke In-Reply-To: <20221129232506.3735672-4-gjoyce@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: axboe@kernel.dk, nayna@linux.ibm.com, keyrings@vger.kernel.org, jonathan.derrick@linux.dev, brking@linux.vnet.ibm.com, akpm@linux-foundation.org, msuchanek@suse.de, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 11/30/22 00:25, gjoyce@linux.vnet.ibm.com wrote: > From: Greg Joyce > > Extend the SED block driver so it can alternatively > obtain a key from a sed-opal kernel keyring. The SED > ioctls will indicate the source of the key, either > directly in the ioctl data or from the keyring. > > This allows the use of SED commands in scripts such as > udev scripts so that drives may be automatically unlocked > as they become available. > > Signed-off-by: Greg Joyce > Reviewed-by: Jonathan Derrick > --- > block/Kconfig | 1 + > block/sed-opal.c | 174 +++++++++++++++++++++++++++++++++- > include/linux/sed-opal.h | 3 + > include/uapi/linux/sed-opal.h | 8 +- > 4 files changed, 183 insertions(+), 3 deletions(-) > > diff --git a/block/Kconfig b/block/Kconfig > index 444c5ab3b67e..b46f93ac8405 100644 > --- a/block/Kconfig > +++ b/block/Kconfig > @@ -181,6 +181,7 @@ config BLK_DEBUG_FS_ZONED > > config BLK_SED_OPAL > bool "Logic for interfacing with Opal enabled SEDs" > + depends on KEYS > help > Builds Logic for interfacing with Opal enabled controllers. > Enabling this option enables users to setup/unlock/lock > diff --git a/block/sed-opal.c b/block/sed-opal.c > index 993b2b7cc4c2..a8729892178b 100644 > --- a/block/sed-opal.c > +++ b/block/sed-opal.c > @@ -20,6 +20,9 @@ > #include > #include > #include > +#include > +#include > +#include > > #include "opal_proto.h" > > @@ -29,6 +32,8 @@ > /* Number of bytes needed by cmd_finalize. */ > #define CMD_FINALIZE_BYTES_NEEDED 7 > > +static struct key *sed_opal_keyring; > + > struct opal_step { > int (*fn)(struct opal_dev *dev, void *data); > void *data; > @@ -265,6 +270,101 @@ static void print_buffer(const u8 *ptr, u32 length) > #endif > } > > +/* > + * Allocate/update a SED Opal key and add it to the SED Opal keyring. > + */ > +static int update_sed_opal_key(const char *desc, u_char *key_data, int keylen) > +{ > + key_ref_t kr; > + > + if (!sed_opal_keyring) > + return -ENOKEY; > + > + kr = key_create_or_update(make_key_ref(sed_opal_keyring, true), "user", > + desc, (const void *)key_data, keylen, > + KEY_USR_VIEW | KEY_USR_SEARCH | KEY_USR_WRITE, > + KEY_ALLOC_NOT_IN_QUOTA | KEY_ALLOC_BUILT_IN | > + KEY_ALLOC_BYPASS_RESTRICTION); > + if (IS_ERR(kr)) { > + pr_err("Error adding SED key (%ld)\n", PTR_ERR(kr)); > + return PTR_ERR(kr); > + } > + > + return 0; > +} > + > +/* > + * Read a SED Opal key from the SED Opal keyring. > + */ > +static int read_sed_opal_key(const char *key_name, u_char *buffer, int buflen) > +{ > + int ret; > + key_ref_t kref; > + struct key *key; > + > + if (!sed_opal_keyring) > + return -ENOKEY; > + > + kref = keyring_search(make_key_ref(sed_opal_keyring, true), > + &key_type_user, key_name, true); > + > + if (IS_ERR(kref)) > + ret = PTR_ERR(kref); > + > + key = key_ref_to_ptr(kref); > + down_read(&key->sem); > + ret = key_validate(key); > + if (ret == 0) { > + if (buflen > key->datalen) > + buflen = key->datalen; > + > + ret = key->type->read(key, (char *)buffer, buflen); > + } > + up_read(&key->sem); > + > + key_ref_put(kref); > + > + return ret; > +} > + > +static int opal_get_key(struct opal_dev *dev, struct opal_key *key) > +{ > + int ret = 0; > + > + switch (key->key_type) { > + case OPAL_INCLUDED: > + /* the key is ready to use */ > + break; > + case OPAL_KEYRING: > + /* the key is in the keyring */ > + ret = read_sed_opal_key(OPAL_AUTH_KEY, key->key, OPAL_KEY_MAX); > + if (ret > 0) { > + if (ret > 255) { Why is a key longer than 255 an error? If this is a requirement, why not move the check into read_sed_opal_key() such that one only has to check for ret < 0 on errors? > + ret = -ENOSPC; > + goto error; > + } > + key->key_len = ret; > + key->key_type = OPAL_INCLUDED; > + } > + break; > + default: > + ret = -EINVAL; > + break; > + } > + if (ret < 0) > + goto error; > + > + /* must have a PEK by now or it's an error */ > + if (key->key_type != OPAL_INCLUDED || key->key_len == 0) { > + ret = -EINVAL; > + goto error; > + } > + return 0; > +error: > + pr_debug("Error getting password: %d\n", ret); > + return ret; > +} > + > static bool check_tper(const void *data) > { > const struct d0_tper_features *tper = data; > @@ -2269,6 +2369,9 @@ static int opal_secure_erase_locking_range(struct opal_dev *dev, > }; > int ret; > > + ret = opal_get_key(dev, &opal_session->opal_key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, erase_steps, ARRAY_SIZE(erase_steps)); > @@ -2302,6 +2405,9 @@ static int opal_revertlsp(struct opal_dev *dev, struct opal_revert_lsp *rev) > }; > int ret; > > + ret = opal_get_key(dev, &rev->key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, steps, ARRAY_SIZE(steps)); > @@ -2320,6 +2426,9 @@ static int opal_erase_locking_range(struct opal_dev *dev, > }; > int ret; > > + ret = opal_get_key(dev, &opal_session->opal_key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, erase_steps, ARRAY_SIZE(erase_steps)); > @@ -2348,6 +2457,9 @@ static int opal_enable_disable_shadow_mbr(struct opal_dev *dev, > opal_mbr->enable_disable != OPAL_MBR_DISABLE) > return -EINVAL; > > + ret = opal_get_key(dev, &opal_mbr->key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, mbr_steps, ARRAY_SIZE(mbr_steps)); > @@ -2373,6 +2485,9 @@ static int opal_set_mbr_done(struct opal_dev *dev, > mbr_done->done_flag != OPAL_MBR_NOT_DONE) > return -EINVAL; > > + ret = opal_get_key(dev, &mbr_done->key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, mbr_steps, ARRAY_SIZE(mbr_steps)); > @@ -2394,6 +2509,9 @@ static int opal_write_shadow_mbr(struct opal_dev *dev, > if (info->size == 0) > return 0; > > + ret = opal_get_key(dev, &info->key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, mbr_steps, ARRAY_SIZE(mbr_steps)); > @@ -2450,6 +2568,9 @@ static int opal_add_user_to_lr(struct opal_dev *dev, > return -EINVAL; > } > > + ret = opal_get_key(dev, &lk_unlk->session.opal_key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, steps, ARRAY_SIZE(steps)); > @@ -2472,6 +2593,10 @@ static int opal_reverttper(struct opal_dev *dev, struct opal_key *opal, bool psi > > int ret; > > + ret = opal_get_key(dev, opal); > + > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > if (psid) > @@ -2534,6 +2659,9 @@ static int opal_lock_unlock(struct opal_dev *dev, > if (lk_unlk->session.who > OPAL_USER9) > return -EINVAL; > > + ret = opal_get_key(dev, &lk_unlk->session.opal_key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > ret = __opal_lock_unlock(dev, lk_unlk); > mutex_unlock(&dev->dev_lock); > @@ -2556,6 +2684,9 @@ static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal) > if (!dev) > return -ENODEV; > > + ret = opal_get_key(dev, opal); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, owner_steps, ARRAY_SIZE(owner_steps)); > @@ -2578,6 +2709,9 @@ static int opal_activate_lsp(struct opal_dev *dev, > if (!opal_lr_act->num_lrs || opal_lr_act->num_lrs > OPAL_MAX_LRS) > return -EINVAL; > > + ret = opal_get_key(dev, &opal_lr_act->key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, active_steps, ARRAY_SIZE(active_steps)); > @@ -2596,6 +2730,9 @@ static int opal_setup_locking_range(struct opal_dev *dev, > }; > int ret; > > + ret = opal_get_key(dev, &opal_lrs->session.opal_key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, lr_steps, ARRAY_SIZE(lr_steps)); > @@ -2622,6 +2759,14 @@ static int opal_set_new_pw(struct opal_dev *dev, struct opal_new_pw *opal_pw) > ret = execute_steps(dev, pw_steps, ARRAY_SIZE(pw_steps)); > mutex_unlock(&dev->dev_lock); > > + if (ret) > + return ret; > + > + /* update keyring with new password */ > + ret = update_sed_opal_key(OPAL_AUTH_KEY, > + opal_pw->new_user_pw.opal_key.key, > + opal_pw->new_user_pw.opal_key.key_len); > + > return ret; > } > What about key revocation? You only allow to set a new key, but what happens with the old ones? > @@ -2642,6 +2787,9 @@ static int opal_activate_user(struct opal_dev *dev, > return -EINVAL; > } > > + ret = opal_get_key(dev, &opal_session->opal_key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > ret = execute_steps(dev, act_steps, ARRAY_SIZE(act_steps)); > @@ -2728,6 +2876,9 @@ static int opal_generic_read_write_table(struct opal_dev *dev, > { > int ret, bit_set; > > + ret = opal_get_key(dev, &rw_tbl->key); > + if (ret) > + return ret; > mutex_lock(&dev->dev_lock); > setup_opal_dev(dev); > > @@ -2776,9 +2927,9 @@ int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *arg) > if (!capable(CAP_SYS_ADMIN)) > return -EACCES; > if (!dev) > - return -ENOTSUPP; > + return -EOPNOTSUPP; > if (!(dev->flags & OPAL_FL_SUPPORTED)) > - return -ENOTSUPP; > + return -EOPNOTSUPP; > > if (cmd & IOC_IN) { > p = memdup_user(arg, _IOC_SIZE(cmd)); > @@ -2854,3 +3005,22 @@ int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *arg) > return ret; > } > EXPORT_SYMBOL_GPL(sed_ioctl); > + > +static int __init sed_opal_init(void) > +{ > + struct key *kr; > + > + kr = keyring_alloc(".sed_opal", > + GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, current_cred(), > + (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | > + KEY_USR_READ | KEY_USR_SEARCH | KEY_USR_WRITE, > + KEY_ALLOC_NOT_IN_QUOTA, > + NULL, NULL); > + if (IS_ERR(kr)) > + return PTR_ERR(kr); > + > + sed_opal_keyring = kr; > + > + return 0; > +} > +late_initcall(sed_opal_init); Shouldn't you free the keyring on exit? > diff --git a/include/linux/sed-opal.h b/include/linux/sed-opal.h > index 7131d7f0eec2..57d483506b4a 100644 > --- a/include/linux/sed-opal.h > +++ b/include/linux/sed-opal.h > @@ -24,6 +24,9 @@ bool opal_unlock_from_suspend(struct opal_dev *dev); > struct opal_dev *init_opal_dev(void *data, sec_send_recv *send_recv); > int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *ioctl_ptr); > > +#define OPAL_AUTH_KEY "opal-boot-pin" > +#define OPAL_AUTH_KEY_PREV "opal-boot-pin-prev" > + > static inline bool is_sed_ioctl(unsigned int cmd) > { > switch (cmd) { > diff --git a/include/uapi/linux/sed-opal.h b/include/uapi/linux/sed-opal.h > index fccde168e90c..6b79cdcf9518 100644 > --- a/include/uapi/linux/sed-opal.h > +++ b/include/uapi/linux/sed-opal.h > @@ -44,10 +44,16 @@ enum opal_lock_state { > OPAL_LK = 0x04, /* 0100 */ > }; > > +enum opal_key_type { > + OPAL_INCLUDED = 0, /* key[] is the key */ > + OPAL_KEYRING, /* key is in keyring */ > +}; > + > struct opal_key { > __u8 lr; > __u8 key_len; > - __u8 __align[6]; > + __u8 key_type; > + __u8 __align[5]; > __u8 key[OPAL_KEY_MAX]; > }; > Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@suse.de +49 911 74053 688 SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 (AG Nürnberg), Geschäftsführer: Ivo Totev, Andrew Myers, Andrew McDonald, Martje Boudien Moerman