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mac_bsdextended.c
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mac_bsdextended.h
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ugidfw_internal.h
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ugidfw_system.c
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ugidfw_vnode.c
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Editing: mac_bsdextended.c
/*- * Copyright (c) 1999-2002, 2007-2008 Robert N. M. Watson * Copyright (c) 2001-2005 Networks Associates Technology, Inc. * Copyright (c) 2005 Tom Rhodes * Copyright (c) 2006 SPARTA, Inc. * All rights reserved. * * This software was developed by Robert Watson for the TrustedBSD Project. * It was later enhanced by Tom Rhodes for the TrustedBSD Project. * * This software was developed for the FreeBSD Project in part by Network * Associates Laboratories, the Security Research Division of Network * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), * as part of the DARPA CHATS research program. * * This software was enhanced by SPARTA ISSO under SPAWAR contract * N66001-04-C-6019 ("SEFOS"). * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ /* * Developed by the TrustedBSD Project. * * "BSD Extended" MAC policy, allowing the administrator to impose mandatory * firewall-like rules regarding users and file system objects. */ #include <sys/param.h> #include <sys/acl.h> #include <sys/kernel.h> #include <sys/jail.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/module.h> #include <sys/mount.h> #include <sys/mutex.h> #include <sys/priv.h> #include <sys/proc.h> #include <sys/systm.h> #include <sys/vnode.h> #include <sys/sysctl.h> #include <sys/syslog.h> #include <sys/stat.h> #include <security/mac/mac_policy.h> #include <security/mac_bsdextended/mac_bsdextended.h> #include <security/mac_bsdextended/ugidfw_internal.h> static struct mtx ugidfw_mtx; SYSCTL_DECL(_security_mac); static SYSCTL_NODE(_security_mac, OID_AUTO, bsdextended, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "TrustedBSD extended BSD MAC policy controls"); static int ugidfw_enabled = 1; SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, enabled, CTLFLAG_RWTUN, &ugidfw_enabled, 0, "Enforce extended BSD policy"); static MALLOC_DEFINE(M_MACBSDEXTENDED, "mac_bsdextended", "BSD Extended MAC rule"); #define MAC_BSDEXTENDED_MAXRULES 250 static struct mac_bsdextended_rule *rules[MAC_BSDEXTENDED_MAXRULES]; static int rule_count = 0; static int rule_slots = 0; static int rule_version = MB_VERSION; SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, rule_count, CTLFLAG_RD, &rule_count, 0, "Number of defined rules\n"); SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, rule_slots, CTLFLAG_RD, &rule_slots, 0, "Number of used rule slots\n"); SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, rule_version, CTLFLAG_RD, &rule_version, 0, "Version number for API\n"); /* * This is just used for logging purposes, eventually we would like to log * much more then failed requests. */ static int ugidfw_logging; SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, logging, CTLFLAG_RW, &ugidfw_logging, 0, "Log failed authorization requests"); /* * This tunable is here for compatibility. It will allow the user to switch * between the new mode (first rule matches) and the old functionality (all * rules match). */ static int ugidfw_firstmatch_enabled; SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, firstmatch_enabled, CTLFLAG_RW, &ugidfw_firstmatch_enabled, 1, "Disable/enable match first rule functionality"); static int ugidfw_rule_valid(struct mac_bsdextended_rule *rule) { if ((rule->mbr_subject.mbs_flags | MBS_ALL_FLAGS) != MBS_ALL_FLAGS) return (EINVAL); if ((rule->mbr_subject.mbs_neg | MBS_ALL_FLAGS) != MBS_ALL_FLAGS) return (EINVAL); if ((rule->mbr_object.mbo_flags | MBO_ALL_FLAGS) != MBO_ALL_FLAGS) return (EINVAL); if ((rule->mbr_object.mbo_neg | MBO_ALL_FLAGS) != MBO_ALL_FLAGS) return (EINVAL); if (((rule->mbr_object.mbo_flags & MBO_TYPE_DEFINED) != 0) && (rule->mbr_object.mbo_type | MBO_ALL_TYPE) != MBO_ALL_TYPE) return (EINVAL); if ((rule->mbr_mode | MBI_ALLPERM) != MBI_ALLPERM) return (EINVAL); return (0); } static int sysctl_rule(SYSCTL_HANDLER_ARGS) { struct mac_bsdextended_rule temprule, *ruleptr; u_int namelen; int error, index, *name; error = 0; name = (int *)arg1; namelen = arg2; if (namelen != 1) return (EINVAL); index = name[0]; if (index >= MAC_BSDEXTENDED_MAXRULES) return (ENOENT); ruleptr = NULL; if (req->newptr && req->newlen != 0) { error = SYSCTL_IN(req, &temprule, sizeof(temprule)); if (error) return (error); ruleptr = malloc(sizeof(*ruleptr), M_MACBSDEXTENDED, M_WAITOK | M_ZERO); } mtx_lock(&ugidfw_mtx); if (req->oldptr) { if (index < 0 || index > rule_slots + 1) { error = ENOENT; goto out; } if (rules[index] == NULL) { error = ENOENT; goto out; } temprule = *rules[index]; } if (req->newptr && req->newlen == 0) { KASSERT(ruleptr == NULL, ("sysctl_rule: ruleptr != NULL")); ruleptr = rules[index]; if (ruleptr == NULL) { error = ENOENT; goto out; } rule_count--; rules[index] = NULL; } else if (req->newptr) { error = ugidfw_rule_valid(&temprule); if (error) goto out; if (rules[index] == NULL) { *ruleptr = temprule; rules[index] = ruleptr; ruleptr = NULL; if (index + 1 > rule_slots) rule_slots = index + 1; rule_count++; } else *rules[index] = temprule; } out: mtx_unlock(&ugidfw_mtx); if (ruleptr != NULL) free(ruleptr, M_MACBSDEXTENDED); if (req->oldptr && error == 0) error = SYSCTL_OUT(req, &temprule, sizeof(temprule)); return (error); } static SYSCTL_NODE(_security_mac_bsdextended, OID_AUTO, rules, CTLFLAG_MPSAFE | CTLFLAG_RW, sysctl_rule, "BSD extended MAC rules"); static void ugidfw_init(struct mac_policy_conf *mpc) { mtx_init(&ugidfw_mtx, "mac_bsdextended lock", NULL, MTX_DEF); } static void ugidfw_destroy(struct mac_policy_conf *mpc) { int i; for (i = 0; i < MAC_BSDEXTENDED_MAXRULES; i++) { if (rules[i] != NULL) free(rules[i], M_MACBSDEXTENDED); } mtx_destroy(&ugidfw_mtx); } static int ugidfw_rulecheck(struct mac_bsdextended_rule *rule, struct ucred *cred, struct vnode *vp, struct vattr *vap, int acc_mode) { int mac_granted, match, priv_granted; int i; /* * Is there a subject match? */ mtx_assert(&ugidfw_mtx, MA_OWNED); if (rule->mbr_subject.mbs_flags & MBS_UID_DEFINED) { match = ((cred->cr_uid <= rule->mbr_subject.mbs_uid_max && cred->cr_uid >= rule->mbr_subject.mbs_uid_min) || (cred->cr_ruid <= rule->mbr_subject.mbs_uid_max && cred->cr_ruid >= rule->mbr_subject.mbs_uid_min) || (cred->cr_svuid <= rule->mbr_subject.mbs_uid_max && cred->cr_svuid >= rule->mbr_subject.mbs_uid_min)); if (rule->mbr_subject.mbs_neg & MBS_UID_DEFINED) match = !match; if (!match) return (0); } if (rule->mbr_subject.mbs_flags & MBS_GID_DEFINED) { match = ((cred->cr_rgid <= rule->mbr_subject.mbs_gid_max && cred->cr_rgid >= rule->mbr_subject.mbs_gid_min) || (cred->cr_svgid <= rule->mbr_subject.mbs_gid_max && cred->cr_svgid >= rule->mbr_subject.mbs_gid_min)); if (!match) { for (i = 0; i < cred->cr_ngroups; i++) { if (cred->cr_groups[i] <= rule->mbr_subject.mbs_gid_max && cred->cr_groups[i] >= rule->mbr_subject.mbs_gid_min) { match = 1; break; } } } if (rule->mbr_subject.mbs_neg & MBS_GID_DEFINED) match = !match; if (!match) return (0); } if (rule->mbr_subject.mbs_flags & MBS_PRISON_DEFINED) { match = (cred->cr_prison->pr_id == rule->mbr_subject.mbs_prison); if (rule->mbr_subject.mbs_neg & MBS_PRISON_DEFINED) match = !match; if (!match) return (0); } /* * Is there an object match? */ if (rule->mbr_object.mbo_flags & MBO_UID_DEFINED) { match = (vap->va_uid <= rule->mbr_object.mbo_uid_max && vap->va_uid >= rule->mbr_object.mbo_uid_min); if (rule->mbr_object.mbo_neg & MBO_UID_DEFINED) match = !match; if (!match) return (0); } if (rule->mbr_object.mbo_flags & MBO_GID_DEFINED) { match = (vap->va_gid <= rule->mbr_object.mbo_gid_max && vap->va_gid >= rule->mbr_object.mbo_gid_min); if (rule->mbr_object.mbo_neg & MBO_GID_DEFINED) match = !match; if (!match) return (0); } if (rule->mbr_object.mbo_flags & MBO_FSID_DEFINED) { match = (fsidcmp(&vp->v_mount->mnt_stat.f_fsid, &rule->mbr_object.mbo_fsid) == 0); if (rule->mbr_object.mbo_neg & MBO_FSID_DEFINED) match = !match; if (!match) return (0); } if (rule->mbr_object.mbo_flags & MBO_SUID) { match = (vap->va_mode & S_ISUID); if (rule->mbr_object.mbo_neg & MBO_SUID) match = !match; if (!match) return (0); } if (rule->mbr_object.mbo_flags & MBO_SGID) { match = (vap->va_mode & S_ISGID); if (rule->mbr_object.mbo_neg & MBO_SGID) match = !match; if (!match) return (0); } if (rule->mbr_object.mbo_flags & MBO_UID_SUBJECT) { match = (vap->va_uid == cred->cr_uid || vap->va_uid == cred->cr_ruid || vap->va_uid == cred->cr_svuid); if (rule->mbr_object.mbo_neg & MBO_UID_SUBJECT) match = !match; if (!match) return (0); } if (rule->mbr_object.mbo_flags & MBO_GID_SUBJECT) { match = (groupmember(vap->va_gid, cred) || vap->va_gid == cred->cr_rgid || vap->va_gid == cred->cr_svgid); if (rule->mbr_object.mbo_neg & MBO_GID_SUBJECT) match = !match; if (!match) return (0); } if (rule->mbr_object.mbo_flags & MBO_TYPE_DEFINED) { switch (vap->va_type) { case VREG: match = (rule->mbr_object.mbo_type & MBO_TYPE_REG); break; case VDIR: match = (rule->mbr_object.mbo_type & MBO_TYPE_DIR); break; case VBLK: match = (rule->mbr_object.mbo_type & MBO_TYPE_BLK); break; case VCHR: match = (rule->mbr_object.mbo_type & MBO_TYPE_CHR); break; case VLNK: match = (rule->mbr_object.mbo_type & MBO_TYPE_LNK); break; case VSOCK: match = (rule->mbr_object.mbo_type & MBO_TYPE_SOCK); break; case VFIFO: match = (rule->mbr_object.mbo_type & MBO_TYPE_FIFO); break; default: match = 0; } if (rule->mbr_object.mbo_neg & MBO_TYPE_DEFINED) match = !match; if (!match) return (0); } /* * MBI_APPEND should not be here as it should get converted to * MBI_WRITE. */ priv_granted = 0; mac_granted = rule->mbr_mode; if ((acc_mode & MBI_ADMIN) && (mac_granted & MBI_ADMIN) == 0 && priv_check_cred(cred, PRIV_VFS_ADMIN) == 0) priv_granted |= MBI_ADMIN; if ((acc_mode & MBI_EXEC) && (mac_granted & MBI_EXEC) == 0 && priv_check_cred(cred, (vap->va_type == VDIR) ? PRIV_VFS_LOOKUP : PRIV_VFS_EXEC) == 0) priv_granted |= MBI_EXEC; if ((acc_mode & MBI_READ) && (mac_granted & MBI_READ) == 0 && priv_check_cred(cred, PRIV_VFS_READ) == 0) priv_granted |= MBI_READ; if ((acc_mode & MBI_STAT) && (mac_granted & MBI_STAT) == 0 && priv_check_cred(cred, PRIV_VFS_STAT) == 0) priv_granted |= MBI_STAT; if ((acc_mode & MBI_WRITE) && (mac_granted & MBI_WRITE) == 0 && priv_check_cred(cred, PRIV_VFS_WRITE) == 0) priv_granted |= MBI_WRITE; /* * Is the access permitted? */ if (((mac_granted | priv_granted) & acc_mode) != acc_mode) { if (ugidfw_logging) log(LOG_AUTHPRIV, "mac_bsdextended: %d:%d request %d" " on %d:%d failed. \n", cred->cr_ruid, cred->cr_rgid, acc_mode, vap->va_uid, vap->va_gid); return (EACCES); } /* * If the rule matched, permits access, and first match is enabled, * return success. */ if (ugidfw_firstmatch_enabled) return (EJUSTRETURN); else return (0); } int ugidfw_check(struct ucred *cred, struct vnode *vp, struct vattr *vap, int acc_mode) { int error, i; /* * Since we do not separately handle append, map append to write. */ if (acc_mode & MBI_APPEND) { acc_mode &= ~MBI_APPEND; acc_mode |= MBI_WRITE; } mtx_lock(&ugidfw_mtx); for (i = 0; i < rule_slots; i++) { if (rules[i] == NULL) continue; error = ugidfw_rulecheck(rules[i], cred, vp, vap, acc_mode); if (error == EJUSTRETURN) break; if (error) { mtx_unlock(&ugidfw_mtx); return (error); } } mtx_unlock(&ugidfw_mtx); return (0); } int ugidfw_check_vp(struct ucred *cred, struct vnode *vp, int acc_mode) { int error; struct vattr vap; if (!ugidfw_enabled) return (0); error = VOP_GETATTR(vp, &vap, cred); if (error) return (error); return (ugidfw_check(cred, vp, &vap, acc_mode)); } int ugidfw_accmode2mbi(accmode_t accmode) { int mbi; mbi = 0; if (accmode & VEXEC) mbi |= MBI_EXEC; if (accmode & VWRITE) mbi |= MBI_WRITE; if (accmode & VREAD) mbi |= MBI_READ; if (accmode & VADMIN_PERMS) mbi |= MBI_ADMIN; if (accmode & VSTAT_PERMS) mbi |= MBI_STAT; if (accmode & VAPPEND) mbi |= MBI_APPEND; return (mbi); } static struct mac_policy_ops ugidfw_ops = { .mpo_destroy = ugidfw_destroy, .mpo_init = ugidfw_init, .mpo_system_check_acct = ugidfw_system_check_acct, .mpo_system_check_auditctl = ugidfw_system_check_auditctl, .mpo_system_check_swapon = ugidfw_system_check_swapon, .mpo_vnode_check_access = ugidfw_vnode_check_access, .mpo_vnode_check_chdir = ugidfw_vnode_check_chdir, .mpo_vnode_check_chroot = ugidfw_vnode_check_chroot, .mpo_vnode_check_create = ugidfw_check_create_vnode, .mpo_vnode_check_deleteacl = ugidfw_vnode_check_deleteacl, .mpo_vnode_check_deleteextattr = ugidfw_vnode_check_deleteextattr, .mpo_vnode_check_exec = ugidfw_vnode_check_exec, .mpo_vnode_check_getacl = ugidfw_vnode_check_getacl, .mpo_vnode_check_getextattr = ugidfw_vnode_check_getextattr, .mpo_vnode_check_link = ugidfw_vnode_check_link, .mpo_vnode_check_listextattr = ugidfw_vnode_check_listextattr, .mpo_vnode_check_lookup = ugidfw_vnode_check_lookup, .mpo_vnode_check_open = ugidfw_vnode_check_open, .mpo_vnode_check_readdir = ugidfw_vnode_check_readdir, .mpo_vnode_check_readlink = ugidfw_vnode_check_readdlink, .mpo_vnode_check_rename_from = ugidfw_vnode_check_rename_from, .mpo_vnode_check_rename_to = ugidfw_vnode_check_rename_to, .mpo_vnode_check_revoke = ugidfw_vnode_check_revoke, .mpo_vnode_check_setacl = ugidfw_check_setacl_vnode, .mpo_vnode_check_setextattr = ugidfw_vnode_check_setextattr, .mpo_vnode_check_setflags = ugidfw_vnode_check_setflags, .mpo_vnode_check_setmode = ugidfw_vnode_check_setmode, .mpo_vnode_check_setowner = ugidfw_vnode_check_setowner, .mpo_vnode_check_setutimes = ugidfw_vnode_check_setutimes, .mpo_vnode_check_stat = ugidfw_vnode_check_stat, .mpo_vnode_check_unlink = ugidfw_vnode_check_unlink, }; MAC_POLICY_SET(&ugidfw_ops, mac_bsdextended, "TrustedBSD MAC/BSD Extended", MPC_LOADTIME_FLAG_UNLOADOK, NULL);
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