From patchwork Tue Jan 25 22:36:29 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shirish Pargaonkar X-Patchwork-Id: 507411 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p0PMauY9030113 for ; Tue, 25 Jan 2011 22:37:43 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753027Ab1AYWhn (ORCPT ); Tue, 25 Jan 2011 17:37:43 -0500 Received: from mail-qy0-f174.google.com ([209.85.216.174]:41438 "EHLO mail-qy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752936Ab1AYWhn (ORCPT ); Tue, 25 Jan 2011 17:37:43 -0500 Received: by mail-qy0-f174.google.com with SMTP id 19so5038440qyj.19 for ; Tue, 25 Jan 2011 14:37:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:from:to:cc:subject:date:message-id:x-mailer; bh=ngRPPgkMJeAkgNA7vN7bUG6nIS4Hg22aOgum2mo5Fbc=; 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Tue, 25 Jan 2011 22:37:44 +0000 (UTC) diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c index b165496..2b5294d 100644 --- a/fs/cifs/cifsacl.c +++ b/fs/cifs/cifsacl.c @@ -99,6 +99,159 @@ struct key_type cifs_idmap_key_type = { .match = user_match, }; +static unsigned long +id_rb_search(struct rb_root *root, struct cifs_sid *sidptr) +{ + unsigned int nds = 0; + int rc; + unsigned long id = 0; + struct rb_node *node = root->rb_node; + struct cifs_sid_id *sididptr; + + while (node) { + ++nds; + sididptr = rb_entry(node, struct cifs_sid_id, rbnode); + rc = compare_sids(sidptr, &sididptr->sid); + if (rc > 0) + node = node->rb_left; + else if (rc < 0) + node = node->rb_right; + else { + id = sididptr->id; + break; + } + } + + return id; +} + +static void +id_rb_insert(struct rb_root *root, struct cifs_sid_id *new_sididptr, + unsigned long id) +{ + int rc; + struct rb_node **new = &(root->rb_node), *parent = NULL; + struct cifs_sid_id *sididptr; + + while (*new) { + sididptr = rb_entry(*new, struct cifs_sid_id, rbnode); + parent = *new; + + rc = compare_sids(&sididptr->sid, &new_sididptr->sid); + if (rc < 0) + new = &((*new)->rb_left); + if (rc > 0) + new = &((*new)->rb_right); + else { + kfree(new_sididptr); + return; + } + } + + rb_link_node(&new_sididptr->rbnode, parent, new); + rb_insert_color(&new_sididptr->rbnode, root); +} + +static void +sid_to_str(struct cifs_sid *sidptr, char *sidstr) +{ + int i; + unsigned long saval; + char *strptr; + + strptr = sidstr; + + sprintf(strptr, "%s", "S"); + strptr = sidstr + strlen(sidstr); + + sprintf(strptr, "-%d", sidptr->revision); + strptr = sidstr + strlen(sidstr); + + for (i = 0; i < 6; ++i) { + if (sidptr->authority[i]) { + sprintf(strptr, "-%d", sidptr->authority[i]); + strptr = sidstr + strlen(sidstr); + } + } + + for (i = 0; i < sidptr->num_subauth; ++i) { + saval = le32_to_cpu(sidptr->sub_auth[i]); + sprintf(strptr, "-%ld", saval); + strptr = sidstr + strlen(sidstr); + } +} + +static int +sid_to_id(struct cifs_sid *psid, struct cifs_fattr *fattr, uint sidtype) +{ + int rc = 0; + unsigned long id; + char *sidstr, *strptr; + struct key *idkey; + const struct cred *saved_cred; + struct cifs_sid_id *sididptr; + + if (sidtype == SIDOWNER) { + spin_lock(&siduidlock); + id = id_rb_search(&uidtree, psid); + spin_unlock(&siduidlock); + } else if (sidtype == SIDGROUP) { + spin_lock(&sidgidlock); + id = id_rb_search(&gidtree, psid); + spin_unlock(&sidgidlock); + } else + return -ENOENT; + + if (!id) { + sidstr = kzalloc(SIDLEN, GFP_KERNEL); + if (!sidstr) + return -ENOMEM; + + sididptr = kzalloc(sizeof(struct cifs_sid_id), GFP_KERNEL); + if (!sididptr) { + kfree(sidstr); + return -ENOMEM; + } + + if (sidtype == SIDOWNER) + sprintf(sidstr, "%s", "os:"); + else if (sidtype == SIDGROUP) + sprintf(sidstr, "%s", "gs:"); + + strptr = sidstr + strlen(sidstr); + sid_to_str(psid, strptr); + + saved_cred = override_creds(root_cred); + idkey = request_key(&cifs_idmap_key_type, sidstr, ""); + if (IS_ERR(idkey)) + cFYI(1, "%s: Can't resolve SID to an uid", __func__); + else { + id = *(unsigned long *)idkey->payload.value; + key_put(idkey); + memcpy(&sididptr->sid, psid, sizeof(struct cifs_sid)); + sididptr->id = id; + if (sidtype == SIDOWNER) { + spin_lock(&siduidlock); + id_rb_insert(&uidtree, sididptr, id); + spin_unlock(&siduidlock); + } else { + spin_lock(&sidgidlock); + id_rb_insert(&gidtree, sididptr, id); + spin_unlock(&sidgidlock); + } + } + revert_creds(saved_cred); + kfree(sidstr); + } + + if (sidtype == SIDOWNER) + fattr->cf_uid = id; + else + fattr->cf_gid = id; + + return rc; +} + int init_cifs_idmap(void) { @@ -240,16 +393,24 @@ int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) int num_subauth, num_sat, num_saw; if ((!ctsid) || (!cwsid)) - return 0; + return 1; /* compare the revision */ - if (ctsid->revision != cwsid->revision) - return 0; + if (ctsid->revision != cwsid->revision) { + if (ctsid->revision > cwsid->revision) + return 1; + else + return -1; + } /* compare all of the six auth values */ for (i = 0; i < 6; ++i) { - if (ctsid->authority[i] != cwsid->authority[i]) - return 0; + if (ctsid->authority[i] != cwsid->authority[i]) { + if (ctsid->authority[i] > cwsid->authority[i]) + return 1; + else + return -1; + } } /* compare all of the subauth values if any */ @@ -258,12 +419,16 @@ int compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid) num_subauth = num_sat < num_saw ? num_sat : num_saw; if (num_subauth) { for (i = 0; i < num_subauth; ++i) { - if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) - return 0; + if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) { + if (ctsid->sub_auth[i] > cwsid->sub_auth[i]) + return 1; + else + return -1; + } } } - return 1; /* sids compare/match */ + return 0; /* sids compare/match */ } @@ -514,22 +679,22 @@ static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl, #ifdef CONFIG_CIFS_DEBUG2 dump_ace(ppace[i], end_of_acl); #endif - if (compare_sids(&(ppace[i]->sid), pownersid)) + if (compare_sids(&(ppace[i]->sid), pownersid) == 0) access_flags_to_mode(ppace[i]->access_req, ppace[i]->type, &fattr->cf_mode, &user_mask); - if (compare_sids(&(ppace[i]->sid), pgrpsid)) + if (compare_sids(&(ppace[i]->sid), pgrpsid) == 0) access_flags_to_mode(ppace[i]->access_req, ppace[i]->type, &fattr->cf_mode, &group_mask); - if (compare_sids(&(ppace[i]->sid), &sid_everyone)) + if (compare_sids(&(ppace[i]->sid), &sid_everyone) == 0) access_flags_to_mode(ppace[i]->access_req, ppace[i]->type, &fattr->cf_mode, &other_mask); - if (compare_sids(&(ppace[i]->sid), &sid_authusers)) + if (compare_sids(&(ppace[i]->sid), &sid_authusers) == 0) access_flags_to_mode(ppace[i]->access_req, ppace[i]->type, &fattr->cf_mode, @@ -608,9 +773,9 @@ static int parse_sid(struct cifs_sid *psid, char *end_of_acl) /* Convert CIFS ACL to POSIX form */ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, - struct cifs_fattr *fattr) + struct cifs_fattr *fattr) { - int rc; + int rc = 0; struct cifs_sid *owner_sid_ptr, *group_sid_ptr; struct cifs_acl *dacl_ptr; /* no need for SACL ptr */ char *end_of_acl = ((char *)pntsd) + acl_len; @@ -632,12 +797,26 @@ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, le32_to_cpu(pntsd->sacloffset), dacloffset); /* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ rc = parse_sid(owner_sid_ptr, end_of_acl); - if (rc) + if (rc) { + cFYI(1, "%s: Error %d parsing Owner SID", __func__, rc); + return rc; + } + rc = sid_to_id(owner_sid_ptr, fattr, SIDOWNER); + if (rc) { + cFYI(1, "%s: Error %d mapping Owner SID to uid", __func__, rc); return rc; + } rc = parse_sid(group_sid_ptr, end_of_acl); - if (rc) + if (rc) { + cFYI(1, "%s: Error %d mapping Owner SID to uid", __func__, rc); + return rc; + } + rc = sid_to_id(group_sid_ptr, fattr, SIDGROUP); + if (rc) { + cFYI(1, "%s: Error %d mapping Group SID to uid", __func__, rc); return rc; + } if (dacloffset) parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, @@ -652,7 +831,7 @@ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len, memcpy((void *)(&(cifscred->gsid)), (void *)group_sid_ptr, sizeof(struct cifs_sid)); */ - return 0; + return rc; } diff --git a/fs/cifs/cifsacl.h b/fs/cifs/cifsacl.h index c4ae7d0..d103ad3 100644 --- a/fs/cifs/cifsacl.h +++ b/fs/cifs/cifsacl.h @@ -39,6 +39,10 @@ #define ACCESS_ALLOWED 0 #define ACCESS_DENIED 1 +#define SIDOWNER 1 +#define SIDGROUP 2 +#define SIDLEN 150 /* S- 1 revision- 6 authorities- max 5 sub authorities */ + struct cifs_ntsd { __le16 revision; /* revision level */ __le16 type; @@ -74,6 +78,17 @@ struct cifs_wksid { char sidname[SIDNAMELENGTH]; } __attribute__((packed)); +struct cifs_sid_id { + struct rb_node rbnode; + struct cifs_sid sid; + unsigned long id; +} __attribute__((packed)); + +#ifdef __KERNEL__ +extern struct key_type cifs_idmap_key_type; +extern const struct cred *root_cred; +#endif /* KERNEL */ + extern int match_sid(struct cifs_sid *); extern int compare_sids(const struct cifs_sid *, const struct cifs_sid *);