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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id u10sm3186149pfh.54.2019.06.22.15.44.14 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 22 Jun 2019 15:44:15 -0700 (PDT) Date: Sat, 22 Jun 2019 15:44:14 -0700 From: Kees Cook To: Casey Schaufler Cc: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov Subject: Re: [PATCH v3 08/24] LSM: Use lsmblob in security_secctx_to_secid Message-ID: <201906221544.8F71D60A@keescook> References: <20190621185233.6766-1-casey@schaufler-ca.com> <20190621185233.6766-9-casey@schaufler-ca.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190621185233.6766-9-casey@schaufler-ca.com> Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On Fri, Jun 21, 2019 at 11:52:17AM -0700, Casey Schaufler wrote: > Change security_secctx_to_secid() to fill in a lsmblob instead > of a u32 secid. Multiple LSMs may be able to interpret the > string, and this allows for setting whichever secid is > appropriate. In some cases there is scaffolding where other > interfaces have yet to be converted. > > Signed-off-by: Casey Schaufler Reviewed-by: Kees Cook -Kees > --- > include/linux/security.h | 5 +++-- > kernel/cred.c | 4 +--- > net/netfilter/nft_meta.c | 13 ++++++------- > net/netfilter/xt_SECMARK.c | 5 ++++- > net/netlabel/netlabel_unlabeled.c | 14 ++++++++------ > security/security.c | 16 +++++++++++++--- > 6 files changed, 35 insertions(+), 22 deletions(-) > > diff --git a/include/linux/security.h b/include/linux/security.h > index 905830a90745..b0395d224c43 100644 > --- a/include/linux/security.h > +++ b/include/linux/security.h > @@ -443,7 +443,8 @@ int security_setprocattr(const char *lsm, const char *name, void *value, > int security_netlink_send(struct sock *sk, struct sk_buff *skb); > int security_ismaclabel(const char *name); > int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen); > -int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid); > +int security_secctx_to_secid(const char *secdata, u32 seclen, > + struct lsmblob *blob); > void security_release_secctx(char *secdata, u32 seclen); > > void security_inode_invalidate_secctx(struct inode *inode); > @@ -1226,7 +1227,7 @@ static inline int security_secid_to_secctx(u32 secid, char **secdata, u32 *secle > > static inline int security_secctx_to_secid(const char *secdata, > u32 seclen, > - u32 *secid) > + struct lsmblob *blob) > { > return -EOPNOTSUPP; > } > diff --git a/kernel/cred.c b/kernel/cred.c > index 71c14dda107e..d70a2c02ced4 100644 > --- a/kernel/cred.c > +++ b/kernel/cred.c > @@ -725,14 +725,12 @@ EXPORT_SYMBOL(set_security_override); > int set_security_override_from_ctx(struct cred *new, const char *secctx) > { > struct lsmblob blob; > - u32 secid; > int ret; > > - ret = security_secctx_to_secid(secctx, strlen(secctx), &secid); > + ret = security_secctx_to_secid(secctx, strlen(secctx), &blob); > if (ret < 0) > return ret; > > - lsmblob_init(&blob, secid); > return set_security_override(new, &blob); > } > EXPORT_SYMBOL(set_security_override_from_ctx); > diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c > index 987d2d6ce624..91973d3a5f6a 100644 > --- a/net/netfilter/nft_meta.c > +++ b/net/netfilter/nft_meta.c > @@ -576,21 +576,20 @@ static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = { > > static int nft_secmark_compute_secid(struct nft_secmark *priv) > { > - u32 tmp_secid = 0; > + struct lsmblob blob; > int err; > > - err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid); > + err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &blob); > if (err) > return err; > > - if (!tmp_secid) > - return -ENOENT; > - > - err = security_secmark_relabel_packet(tmp_secid); > + /* Using le[0] is scaffolding */ > + err = security_secmark_relabel_packet(blob.secid[0]); > if (err) > return err; > > - priv->secid = tmp_secid; > + /* Using le[1] is scaffolding */ > + priv->secid = blob.secid[0]; > return 0; > } > > diff --git a/net/netfilter/xt_SECMARK.c b/net/netfilter/xt_SECMARK.c > index f16202d26c20..8081fadc30e9 100644 > --- a/net/netfilter/xt_SECMARK.c > +++ b/net/netfilter/xt_SECMARK.c > @@ -49,13 +49,14 @@ secmark_tg(struct sk_buff *skb, const struct xt_action_param *par) > > static int checkentry_lsm(struct xt_secmark_target_info *info) > { > + struct lsmblob blob; > int err; > > info->secctx[SECMARK_SECCTX_MAX - 1] = '\0'; > info->secid = 0; > > err = security_secctx_to_secid(info->secctx, strlen(info->secctx), > - &info->secid); > + &blob); > if (err) { > if (err == -EINVAL) > pr_info_ratelimited("invalid security context \'%s\'\n", > @@ -63,6 +64,8 @@ static int checkentry_lsm(struct xt_secmark_target_info *info) > return err; > } > > + /* scaffolding during the transition */ > + info->secid = blob.secid[0]; > if (!info->secid) { > pr_info_ratelimited("unable to map security context \'%s\'\n", > info->secctx); > diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c > index c92894c3e40a..2976370e41aa 100644 > --- a/net/netlabel/netlabel_unlabeled.c > +++ b/net/netlabel/netlabel_unlabeled.c > @@ -895,7 +895,7 @@ static int netlbl_unlabel_staticadd(struct sk_buff *skb, > void *addr; > void *mask; > u32 addr_len; > - u32 secid; > + struct lsmblob blob; > struct netlbl_audit audit_info; > > /* Don't allow users to add both IPv4 and IPv6 addresses for a > @@ -919,12 +919,13 @@ static int netlbl_unlabel_staticadd(struct sk_buff *skb, > ret_val = security_secctx_to_secid( > nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), > nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), > - &secid); > + &blob); > if (ret_val != 0) > return ret_val; > > + /* scaffolding with the [0] */ > return netlbl_unlhsh_add(&init_net, > - dev_name, addr, mask, addr_len, secid, > + dev_name, addr, mask, addr_len, blob.secid[0], > &audit_info); > } > > @@ -946,7 +947,7 @@ static int netlbl_unlabel_staticadddef(struct sk_buff *skb, > void *addr; > void *mask; > u32 addr_len; > - u32 secid; > + struct lsmblob blob; > struct netlbl_audit audit_info; > > /* Don't allow users to add both IPv4 and IPv6 addresses for a > @@ -968,12 +969,13 @@ static int netlbl_unlabel_staticadddef(struct sk_buff *skb, > ret_val = security_secctx_to_secid( > nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), > nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), > - &secid); > + &blob); > if (ret_val != 0) > return ret_val; > > + /* scaffolding with the [0] */ > return netlbl_unlhsh_add(&init_net, > - NULL, addr, mask, addr_len, secid, > + NULL, addr, mask, addr_len, blob.secid[0], > &audit_info); > } > > diff --git a/security/security.c b/security/security.c > index c7b3d1a294ad..cb1545bfe8c5 100644 > --- a/security/security.c > +++ b/security/security.c > @@ -1999,10 +1999,20 @@ int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) > } > EXPORT_SYMBOL(security_secid_to_secctx); > > -int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) > +int security_secctx_to_secid(const char *secdata, u32 seclen, > + struct lsmblob *blob) > { > - *secid = 0; > - return call_int_hook(secctx_to_secid, 0, secdata, seclen, secid); > + struct security_hook_list *hp; > + int rc; > + > + lsmblob_init(blob, 0); > + hlist_for_each_entry(hp, &security_hook_heads.secctx_to_secid, list) { > + rc = hp->hook.secctx_to_secid(secdata, seclen, > + &blob->secid[hp->slot]); > + if (rc != 0) > + return rc; > + } > + return 0; > } > EXPORT_SYMBOL(security_secctx_to_secid); > > -- > 2.20.1 > -- Kees Cook