On Mon, Apr 29, 2013 at 08:57:18AM -0400, Steve Dickson wrote:
> From: David Quigley <dpquigl@xxxxxxxxxxxxxxx>
>
> This patch adds the ability to encode and decode file labels on the server for
> the purpose of sending them to the client and also to process label change
> requests from the client.
One overflow and a few nits:
> Signed-off-by: Matthew N. Dodd <Matthew.Dodd@xxxxxxxxxx>
> Signed-off-by: Miguel Rodel Felipe <Rodel_FM@xxxxxxxxxxxxxxxxx>
> Signed-off-by: Phua Eu Gene <PHUA_Eu_Gene@xxxxxxxxxxxxxxxxx>
> Signed-off-by: Khin Mi Mi Aung <Mi_Mi_AUNG@xxxxxxxxxxxxxxxxx>
> ---
> fs/nfsd/nfs4proc.c | 41 +++++++++++++++++
> fs/nfsd/nfs4xdr.c | 127 +++++++++++++++++++++++++++++++++++++++++++++++++----
> fs/nfsd/nfsd.h | 15 +++++++
> fs/nfsd/nfsproc.c | 1 +
> fs/nfsd/vfs.c | 28 ++++++++++++
> fs/nfsd/vfs.h | 2 +
> fs/nfsd/xdr4.h | 3 ++
> 7 files changed, 209 insertions(+), 8 deletions(-)
>
> diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> index ae73175..bb17589 100644
> --- a/fs/nfsd/nfs4proc.c
> +++ b/fs/nfsd/nfs4proc.c
> @@ -42,6 +42,36 @@
> #include "current_stateid.h"
> #include "netns.h"
>
> +#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
> +#include <linux/security.h>
> +
> +static inline void
> +nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct nfs4_label *label, u32 *bmval)
> +{
> + struct inode *inode = resfh->fh_dentry->d_inode;
> + int status;
> +
> + mutex_lock(&inode->i_mutex);
> + status = security_inode_setsecctx(resfh->fh_dentry,
> + label->label, label->len);
> + mutex_unlock(&inode->i_mutex);
> +
> + if (status)
> + /*
> + * We should probably fail the whole open at this point,
> + * but we've already created or opened the file, so it's
> + * too late; So this seems the least of evils:
> + */
> + bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
> +
> + return;
> +}
> +#else
> +static inline void
> +nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct nfs4_label *label, u32 *bmval)
> +{ }
> +#endif
> +
> #define NFSDDBG_FACILITY NFSDDBG_PROC
>
> static u32 nfsd_attrmask[] = {
> @@ -230,6 +260,9 @@ do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_o
> (u32 *)open->op_verf.data,
> &open->op_truncate, &open->op_created);
>
> + if (!status && open->op_label != NULL)
> + nfsd4_security_inode_setsecctx(resfh, open->op_label, open->op_bmval);
> +
> /*
> * Following rfc 3530 14.2.16, use the returned bitmask
> * to indicate which attributes we used to store the
> @@ -599,6 +632,9 @@ nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> if (status)
> goto out;
>
> + if (create->cr_label != NULL)
> + nfsd4_security_inode_setsecctx(&resfh, create->cr_label, create->cr_bmval);
> +
> if (create->cr_acl != NULL)
> do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
> create->cr_bmval);
> @@ -888,6 +924,11 @@ nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> setattr->sa_acl);
> if (status)
> goto out;
> + if (setattr->sa_label != NULL)
> + status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
> + setattr->sa_label);
> + if (status)
> + goto out;
> status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
> 0, (time_t)0);
> out:
> diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
> index b38de7a..9d7af7a 100644
> --- a/fs/nfsd/nfs4xdr.c
> +++ b/fs/nfsd/nfs4xdr.c
> @@ -55,6 +55,11 @@
> #include "cache.h"
> #include "netns.h"
>
> +#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
> +#include <linux/security.h>
> +#endif
> +
> +
> #define NFSDDBG_FACILITY NFSDDBG_XDR
>
> /*
> @@ -79,6 +84,24 @@ check_filename(char *str, int len)
> return nfserr_badname;
> return 0;
> }
> +#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
> +static struct nfs4_label *nfsd4_label_alloc(u32 len)
> +{
> + struct nfs4_label *label = NULL;
> +
> + if (len > NFS4_MAXLABELLEN)
> + return ERR_PTR(-EMSGSIZE);
> +
> + label = kzalloc(len + sizeof(struct nfs4_label), GFP_KERNEL);
That should be len + sizeof(struct nfs4_label) + 1, since decode_fattr
null-terminates the label.
> + if (label == NULL)
> + return ERR_PTR(-ENOMEM);
> +
> + label->label = (char *)(label + 1);
> + label->len = len;
> +
> + return label;
> +}
> +#endif
>
> #define DECODE_HEAD \
> __be32 *p; \
> @@ -242,7 +265,8 @@ nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
>
> static __be32
> nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
> - struct iattr *iattr, struct nfs4_acl **acl)
> + struct iattr *iattr, struct nfs4_acl **acl,
> + struct nfs4_label **label)
> {
> int expected_len, len = 0;
> u32 dummy32;
> @@ -386,6 +410,41 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
> goto xdr_error;
> }
> }
> +
> + *label = NULL;
> +#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
> + if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
> + uint32_t pi;
> + uint32_t lfs;
> +
> + READ_BUF(4);
> + len += 4;
> + READ32(lfs);
> + READ_BUF(4);
> + len += 4;
> + READ32(pi);
> + READ_BUF(4);
> + len += 4;
> + READ32(dummy32);
> + READ_BUF(dummy32);
> + len += (XDR_QUADLEN(dummy32) << 2);
> + READMEM(buf, dummy32);
> +
> + *label = nfsd4_label_alloc(dummy32);
> + if (IS_ERR(*label)) {
> + host_err = PTR_ERR(*label);
> + goto out_nfserr;
> + }
> +
> + memcpy((*label)->label, buf, (*label)->len);
> + ((char *)(*label)->label)[(*label)->len] = '\0';
As noted above, this is past the end of the allocated label.
Also, label is already defined as (char *), so the cast's unnecessary.
> + (*label)->pi = pi;
> + (*label)->lfs = lfs;
> +
> + defer_free(argp, kfree, *label);
> + }
> +#endif
> +
> if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
> || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
> || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
> @@ -582,7 +641,7 @@ nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create
> return status;
>
> status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
> - &create->cr_acl);
> + &create->cr_acl, &create->cr_label);
> if (status)
> goto out;
>
> @@ -832,7 +891,7 @@ nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
> case NFS4_CREATE_UNCHECKED:
> case NFS4_CREATE_GUARDED:
> status = nfsd4_decode_fattr(argp, open->op_bmval,
> - &open->op_iattr, &open->op_acl);
> + &open->op_iattr, &open->op_acl, &open->op_label);
> if (status)
> goto out;
> break;
> @@ -846,7 +905,7 @@ nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
> READ_BUF(NFS4_VERIFIER_SIZE);
> COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
> status = nfsd4_decode_fattr(argp, open->op_bmval,
> - &open->op_iattr, &open->op_acl);
> + &open->op_iattr, &open->op_acl, &open->op_label);
> if (status)
> goto out;
> break;
> @@ -1068,7 +1127,7 @@ nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *seta
> if (status)
> return status;
> return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
> - &setattr->sa_acl);
> + &setattr->sa_acl, &setattr->sa_label);
> }
>
> static __be32
> @@ -1989,6 +2048,50 @@ nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
> FATTR4_WORD0_RDATTR_ERROR)
> #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
>
> +#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
> +static inline __be32
> +nfsd4_encode_security_label(struct svc_rqst *rqstp, struct dentry *dentry, __be32 **pp, int *buflen)
> +{
> + void *context;
> + int err;
> + int len;
> + uint32_t pi = 0;
> + uint32_t lfs = 0;
> + __be32 *p = *pp;
> +
> + err = 0;
> + (void)security_inode_getsecctx(dentry->d_inode, &context, &len);
> + if (len < 0)
> + return nfserrno(len);
> +
> + if (*buflen < ((XDR_QUADLEN(len) << 2) + 4 + 4 + 4)) {
> + err = nfserr_resource;
> + goto out;
> + }
> +
> + /*
> + * For now we use a 0 here to indicate the null translation; in
> + * the future we may place a call to translation code here.
> + */
> + if ((*buflen -= 8) < 0)
> + return nfserr_resource;
> +
> + WRITE32(lfs);
> + WRITE32(pi);
> + p = xdr_encode_opaque(p, context, len);
> + *buflen -= (XDR_QUADLEN(len) << 2) + 4;
> +
> + *pp = p;
> +out:
> + security_release_secctx(context, len);
> + return err;
> +}
> +#else
> +static inline __be32
> +nfsd4_encode_security_label(struct svc_rqst *rqstp, struct dentry *dentry, __be32 **pp, int *buflen)
> +{ return 0; }
> +#endif
> +
> static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
> {
> /* As per referral draft: */
> @@ -2439,6 +2542,12 @@ out_acl:
> get_parent_attributes(exp, &stat);
> WRITE64(stat.ino);
> }
> + if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
> + status = nfsd4_encode_security_label(rqstp, dentry,
> + &p, &buflen);
> + if (status)
> + goto out;
> + }
> if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
> WRITE32(3);
> WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
> @@ -3226,16 +3335,18 @@ nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
> {
> __be32 *p;
>
> - RESERVE_SPACE(12);
> + RESERVE_SPACE(16);
> if (nfserr) {
> - WRITE32(2);
> + WRITE32(3);
> + WRITE32(0);
> WRITE32(0);
> WRITE32(0);
> }
> else {
> - WRITE32(2);
> + WRITE32(3);
> WRITE32(setattr->sa_bmval[0]);
> WRITE32(setattr->sa_bmval[1]);
> + WRITE32(setattr->sa_bmval[2]);
> }
> ADJUST_ARGS();
> return nfserr;
> diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
> index 4c682fd..0a2e30c 100644
> --- a/fs/nfsd/nfsd.h
> +++ b/fs/nfsd/nfsd.h
> @@ -328,6 +328,14 @@ void nfsd_lockd_shutdown(void);
> #define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
> (NFSD4_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SUPPATTR_EXCLCREAT)
>
> +#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
> +#define NFSD4_2_SUPPORTED_ATTRS_WORD2 \
> + (NFSD4_SUPPORTED_ATTRS_WORD2 | NFSD4_1_SUPPORTED_ATTRS_WORD2 | \
> + FATTR4_WORD2_SECURITY_LABEL)
Note NFSD4_1_SUPPORTED_ATTRS_WORD2 was already defined to include
NFSD4_SUPPORTED_ATTRS_WORD2, so the above is overkill.
> +#else
> +#define NFSD4_2_SUPPORTED_ATTRS_WORD2 0
> +#endif
> +
> static inline u32 nfsd_suppattrs0(u32 minorversion)
> {
> return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
> @@ -342,6 +350,9 @@ static inline u32 nfsd_suppattrs1(u32 minorversion)
>
> static inline u32 nfsd_suppattrs2(u32 minorversion)
> {
> + if (minorversion == 2)
> + return NFSD4_2_SUPPORTED_ATTRS_WORD2;
> +
> return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD2
> : NFSD4_SUPPORTED_ATTRS_WORD2;
> }
> @@ -356,7 +367,11 @@ static inline u32 nfsd_suppattrs2(u32 minorversion)
> #define NFSD_WRITEABLE_ATTRS_WORD1 \
> (FATTR4_WORD1_MODE | FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP \
> | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
> +#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
> +#define NFSD_WRITEABLE_ATTRS_WORD2 FATTR4_WORD2_SECURITY_LABEL
> +#else
> #define NFSD_WRITEABLE_ATTRS_WORD2 0
> +#endif
>
> #define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
> NFSD_WRITEABLE_ATTRS_WORD0
> diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
> index 54c6b3d..85289a5 100644
> --- a/fs/nfsd/nfsproc.c
> +++ b/fs/nfsd/nfsproc.c
> @@ -743,6 +743,7 @@ nfserrno (int errno)
> { nfserr_notsupp, -EOPNOTSUPP },
> { nfserr_toosmall, -ETOOSMALL },
> { nfserr_serverfault, -ESERVERFAULT },
> + { nfs4err_badlabel, -EMSGSIZE },
The only place we use this is to enforce the maximum label size in
nfsd4_label_alloc, called only in decode_fattr.
I'd actually rather enforce the maximum label size in decode_fattr,
where we can easily return nfs4err_badlabel. And do away with this
mapping.
--b.
> };
> int i;
>
> diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
> index 2b2e239..96f9a82 100644
> --- a/fs/nfsd/vfs.c
> +++ b/fs/nfsd/vfs.c
> @@ -28,6 +28,7 @@
> #include <asm/uaccess.h>
> #include <linux/exportfs.h>
> #include <linux/writeback.h>
> +#include <linux/security.h>
>
> #ifdef CONFIG_NFSD_V3
> #include "xdr3.h"
> @@ -621,6 +622,33 @@ int nfsd4_is_junction(struct dentry *dentry)
> return 0;
> return 1;
> }
> +#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
> +__be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp,
> + struct nfs4_label *label)
> +{
> + __be32 error;
> + int host_error;
> + struct dentry *dentry;
> +
> + error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR);
> + if (error)
> + return error;
> +
> + dentry = fhp->fh_dentry;
> +
> + mutex_lock(&dentry->d_inode->i_mutex);
> + host_error = security_inode_setsecctx(dentry, label->label, label->len);
> + mutex_unlock(&dentry->d_inode->i_mutex);
> + return nfserrno(host_error);
> +}
> +#else
> +__be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp,
> + struct nfs4_label *label)
> +{
> + return nfserr_notsupp;
> +}
> +#endif
> +
> #endif /* defined(CONFIG_NFSD_V4) */
>
> #ifdef CONFIG_NFSD_V3
> diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
> index 5b58941..a9d6f0f 100644
> --- a/fs/nfsd/vfs.h
> +++ b/fs/nfsd/vfs.h
> @@ -56,6 +56,8 @@ int nfsd_mountpoint(struct dentry *, struct svc_export *);
> __be32 nfsd4_set_nfs4_acl(struct svc_rqst *, struct svc_fh *,
> struct nfs4_acl *);
> int nfsd4_get_nfs4_acl(struct svc_rqst *, struct dentry *, struct nfs4_acl **);
> +__be32 nfsd4_set_nfs4_label(struct svc_rqst *, struct svc_fh *,
> + struct nfs4_label *);
> #endif /* CONFIG_NFSD_V4 */
> __be32 nfsd_create(struct svc_rqst *, struct svc_fh *,
> char *name, int len, struct iattr *attrs,
> diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
> index 546f898..132a671 100644
> --- a/fs/nfsd/xdr4.h
> +++ b/fs/nfsd/xdr4.h
> @@ -118,6 +118,7 @@ struct nfsd4_create {
> struct iattr cr_iattr; /* request */
> struct nfsd4_change_info cr_cinfo; /* response */
> struct nfs4_acl *cr_acl;
> + struct nfs4_label *cr_label;
> };
> #define cr_linklen u.link.namelen
> #define cr_linkname u.link.name
> @@ -246,6 +247,7 @@ struct nfsd4_open {
> struct nfs4_file *op_file; /* used during processing */
> struct nfs4_ol_stateid *op_stp; /* used during processing */
> struct nfs4_acl *op_acl;
> + struct nfs4_label *op_label;
> };
> #define op_iattr iattr
>
> @@ -330,6 +332,7 @@ struct nfsd4_setattr {
> u32 sa_bmval[3]; /* request */
> struct iattr sa_iattr; /* request */
> struct nfs4_acl *sa_acl;
> + struct nfs4_label *sa_label;
> };
>
> struct nfsd4_setclientid {
> --
> 1.8.1.4
>
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