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Subject[PATCH 1/2][RFC] v8 Simplified Mandatory Access Control Kernel
diff -uprN -X linux-2.6.22-base/Documentation/dontdiff
linux-2.6.22-base/security/Kconfig linux-2.6.22/security/Kconfig
--- linux-2.6.22-base/security/Kconfig 2007-07-08 16:32:17.000000000 -0700
+++ linux-2.6.22/security/Kconfig 2007-07-10 01:08:05.000000000 -0700
@@ -94,6 +94,7 @@ config SECURITY_ROOTPLUG
If you are unsure how to answer this question, answer N.

source security/selinux/Kconfig
+source security/smack/Kconfig

endmenu

diff -uprN -X linux-2.6.22-base/Documentation/dontdiff
linux-2.6.22-base/security/Makefile linux-2.6.22/security/Makefile
--- linux-2.6.22-base/security/Makefile 2007-07-08 16:32:17.000000000 -0700
+++ linux-2.6.22/security/Makefile 2007-07-10 01:08:05.000000000 -0700
@@ -4,6 +4,7 @@

obj-$(CONFIG_KEYS) += keys/
subdir-$(CONFIG_SECURITY_SELINUX) += selinux
+subdir-$(CONFIG_SECURITY_SMACK) += smack

# if we don't select a security model, use the default capabilities
ifneq ($(CONFIG_SECURITY),y)
@@ -14,5 +15,6 @@ endif
obj-$(CONFIG_SECURITY) += security.o dummy.o inode.o
# Must precede capability.o in order to stack properly.
obj-$(CONFIG_SECURITY_SELINUX) += selinux/built-in.o
+obj-$(CONFIG_SECURITY_SMACK) += commoncap.o smack/built-in.o
obj-$(CONFIG_SECURITY_CAPABILITIES) += commoncap.o capability.o
obj-$(CONFIG_SECURITY_ROOTPLUG) += commoncap.o root_plug.o
diff -uprN -X linux-2.6.22-base/Documentation/dontdiff
linux-2.6.22-base/security/smack/Kconfig linux-2.6.22/security/smack/Kconfig
--- linux-2.6.22-base/security/smack/Kconfig 1969-12-31 16:00:00.000000000
-0800
+++ linux-2.6.22/security/smack/Kconfig 2007-07-10 01:08:05.000000000 -0700
@@ -0,0 +1,10 @@
+config SECURITY_SMACK
+ bool "Simplified Mandatory Access Control Kernel Support"
+ depends on NETLABEL && SECURITY_NETWORK
+ default n
+ help
+ This selects the Simplified Mandatory Access Control Kernel.
+ SMACK is useful for sensitivity, integrity, and a variety
+ of other madatory security schemes.
+ If you are unsure how to answer this question, answer N.
+
diff -uprN -X linux-2.6.22-base/Documentation/dontdiff
linux-2.6.22-base/security/smack/Makefile linux-2.6.22/security/smack/Makefile
--- linux-2.6.22-base/security/smack/Makefile 1969-12-31 16:00:00.000000000
-0800
+++ linux-2.6.22/security/smack/Makefile 2007-07-10 01:08:05.000000000 -0700
@@ -0,0 +1,8 @@
+#
+# Makefile for the SMACK LSM
+#
+
+obj-$(CONFIG_SECURITY_SMACK) := smack.o
+
+smack-y := smack_lsm.o smack_access.o smackfs.o
+
diff -uprN -X linux-2.6.22-base/Documentation/dontdiff
linux-2.6.22-base/security/smack/smack_access.c
linux-2.6.22/security/smack/smack_access.c
--- linux-2.6.22-base/security/smack/smack_access.c 1969-12-31
16:00:00.000000000 -0800
+++ linux-2.6.22/security/smack/smack_access.c 2007-07-24 15:36:18.000000000
-0700
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2.
+ *
+ * Author:
+ * Casey Schaufler <casey@schaufler-ca.com>
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include "smack.h"
+
+extern struct smk_list_entry *smack_list;
+
+static int smk_get_access(smack_t sub, smack_t obj)
+{
+ struct smk_list_entry *sp = smack_list;
+
+ for (; sp != NULL; sp = sp->smk_next)
+ if (sp->smk_rule.smk_subject == sub &&
+ sp->smk_rule.smk_object == obj)
+ return sp->smk_rule.smk_access;
+ /*
+ * No access is explicitly defined for this pair.
+ */
+ return MAY_NOT;
+}
+
+int smk_access(smack_t *sub_label, smack_t *obj_label, int request)
+{
+ smack_t sub = *sub_label;
+ smack_t obj = *obj_label;
+ /*
+ * Hardcoded comparisons.
+ *
+ * A star subject can't access any object.
+ */
+ if (sub == SMK_STAR)
+ return -EACCES;
+ /*
+ * A star object can be accessed by any subject.
+ */
+ if (obj == SMK_STAR)
+ return 0;
+ /*
+ * An object can be accessed in any way by a subject
+ * with the same label.
+ */
+ if (sub == obj)
+ return 0;
+ /*
+ * A hat subject can read any object.
+ * A floor object can be read by any subject.
+ */
+ if (sub == SMK_HAT && ((request & MAY_ANYREAD) == request))
+ return 0;
+
+ if (obj == SMK_FLOOR && ((request & MAY_ANYREAD) == request))
+ return 0;
+ /*
+ * Beyond here an explicit relationship is required.
+ * If the requested access is contained in the available
+ * access (e.g. read is included in readwrite) it's
+ * good.
+ *
+ * Yes, that is supposed to be a single ampersand.
+ */
+ if ((request & smk_get_access(sub, obj)) == request)
+ return 0;
+
+ return -EACCES;
+}
+
+int smk_curacc(smack_t *obj_label, u32 mode)
+{
+ struct task_smack *tsp = current->security;
+ int rc;
+
+ rc = smk_access(&tsp->smk_task, obj_label, mode);
+ if (rc == 0)
+ return 0;
+
+ if (capable(CAP_MAC_OVERRIDE))
+ return 0;
+
+ return rc;
+}
+
+/*
+ * The value that this adds is that everything after any
+ * character that's not allowed in a smack will be null
+ */
+smack_t smk_from_string(char *str)
+{
+ smack_t smack = 0LL;
+ char *cp;
+ int i;
+
+ for (cp = (char *)&smack, i = 0; i < sizeof(smack_t); str++,cp++,i++) {
+ if (*str <= ' ' || *str > '~')
+ return smack;
+ *cp = *str;
+ }
+ /*
+ * Too long.
+ */
+ return SMK_INVALID;
+}
diff -uprN -X linux-2.6.22-base/Documentation/dontdiff
linux-2.6.22-base/security/smack/smackfs.c
linux-2.6.22/security/smack/smackfs.c
--- linux-2.6.22-base/security/smack/smackfs.c 1969-12-31 16:00:00.000000000
-0800
+++ linux-2.6.22/security/smack/smackfs.c 2007-07-24 21:51:30.000000000 -0700
@@ -0,0 +1,994 @@
+/*
+ * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2.
+ *
+ * Author:
+ * Casey Schaufler <casey@schaufler-ca.com>
+ *
+ * Special thanks to the authors of selinuxfs. They had a good idea.
+ *
+ * Karl MacMillan <kmacmillan@tresys.com>
+ * James Morris <jmorris@redhat.com>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/vmalloc.h>
+#include <linux/security.h>
+#include <linux/mutex.h>
+#include <net/netlabel.h>
+#include "../../net/netlabel/netlabel_domainhash.h"
+#include <net/cipso_ipv4.h>
+#include "smack.h"
+
+/*
+ * smackfs pseudo filesystem.
+ */
+
+
+enum smk_inos {
+ SMK_ROOT_INO = 2,
+ SMK_LOAD = 3, /* load policy */
+ SMK_LINKS = 4, /* symlinks */
+ SMK_CIPSO = 5, /* load label -> CIPSO mapping */
+ SMK_DOI = 6, /* CIPSO DOI */
+ SMK_DIRECT = 7, /* CIPSO level indicating direct label */
+ SMK_AMBIENT = 8, /* internet ambient label */
+ SMK_NLTYPE = 9, /* label scheme to use by default */
+ SMK_TMP = 100, /* MUST BE LAST! /smack/tmp */
+};
+
+/*
+ * This is the "ambient" label for network traffic.
+ * If it isn't somehow marked, use this.
+ * It can be reset via smackfs/ambient
+ */
+smack_t smack_net_ambient = SMK_FLOOR;
+
+/*
+ * This is the default packet marking scheme for network traffic.
+ * It can be reset via smackfs/nltype
+ */
+int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4;
+
+/*
+ * This is the level in a CIPSO header that indicates a
+ * smack label is contained directly in the category set.
+ * It can be reset via smackfs/direct
+ */
+int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
+static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
+
+static struct smk_cipso_entry smack_cipso_floor = {
+ .smk_next = NULL,
+ .smk_smack = SMK_FLOOR,
+ .smk_level = 0,
+ .smk_catset = 0LL,
+};
+struct smk_cipso_entry *smack_cipso = &smack_cipso_floor;
+static DEFINE_MUTEX(smack_cipso_lock);
+
+static int smack_list_count;
+struct smk_list_entry *smack_list;
+static DEFINE_MUTEX(smack_list_lock);
+
+/*
+ * 'ssssssss oooooooo mmmm\n\0'
+ */
+#define SMACK_RULE_LINE_SIZE (2 * (sizeof(smack_t) + 1) + 6)
+
+static ssize_t smk_read_load(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t bytes;
+ struct smk_list_entry *slp = smack_list;
+ struct smack_rule *srp;
+ char *result;
+ char *cp;
+ int realbytes = 0;
+
+ bytes = SMACK_RULE_LINE_SIZE * smack_list_count;
+ if (bytes == 0)
+ return 0;
+
+ result = kzalloc(bytes, GFP_KERNEL);
+ if (result == NULL)
+ return -ENOMEM;
+
+ for (cp = result; slp != NULL; slp = slp->smk_next) {
+ srp = &slp->smk_rule;
+ sprintf(cp, "%-8s %-8s",
+ (char *)&srp->smk_subject, (char *)&srp->smk_object);
+ cp += strlen(cp);
+ if (srp->smk_access != 0)
+ *cp++ = ' ';
+ if ((srp->smk_access & MAY_READ) != 0)
+ *cp++ = 'r';
+ if ((srp->smk_access & MAY_WRITE) != 0)
+ *cp++ = 'w';
+ if ((srp->smk_access & MAY_EXEC) != 0)
+ *cp++ = 'x';
+ if ((srp->smk_access & MAY_APPEND) != 0)
+ *cp++ = 'a';
+ *cp++ = '\n';
+ }
+ *cp++ = '\0';
+ realbytes = strlen(result);
+
+ bytes = simple_read_from_buffer(buf, count, ppos, result, realbytes);
+
+ kfree(result);
+
+ return bytes;
+}
+
+/*
+ * For purposes of SMACK:
+ * append is a form of write
+ * exec is a form of read
+ * This isn't reflected here, but I thought I should mention it.
+ */
+
+static void smk_set_access(struct smack_rule *srp)
+{
+ struct smk_list_entry *sp;
+ struct smk_list_entry *newp;
+
+ mutex_lock(&smack_list_lock);
+
+ for (sp = smack_list; sp != NULL; sp = sp->smk_next)
+ if (sp->smk_rule.smk_subject == srp->smk_subject &&
+ sp->smk_rule.smk_object == srp->smk_object) {
+ sp->smk_rule.smk_access = srp->smk_access;
+ break;
+ }
+
+ if (sp == NULL) {
+ newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL);
+ newp->smk_rule = *srp;
+ newp->smk_next = smack_list;
+ smack_list = newp;
+ smack_list_count++;
+ }
+
+ mutex_unlock(&smack_list_lock);
+
+ return;
+}
+
+
+static ssize_t smk_write_load(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct smack_rule rule;
+ ssize_t rc = count;
+ char *data = NULL;
+ char modestr[8];
+ char *cp;
+
+
+ if (!capable(CAP_MAC_OVERRIDE))
+ return -EPERM;
+ /*
+ * No partial writes.
+ */
+ if (*ppos != 0)
+ return -EINVAL;
+
+ /*
+ * 80 characters per line ought to be enough.
+ */
+ if (count > SMACK_LIST_MAX * 80)
+ return -ENOMEM;
+
+ data = kzalloc(count + 1, GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ if (copy_from_user(data, buf, count) != 0) {
+ kfree(data);
+ return -EFAULT;
+ }
+
+ *(data + count) = '\0';
+
+ for (cp = data - 1; cp != NULL; cp = strchr(cp + 1, '\n')) {
+ if (*++cp == '\0')
+ break;
+ if (sscanf(cp, "%7s %7s %7s\n",
+ (char *)&rule.smk_subject,
+ (char *)&rule.smk_object, modestr) != 3) {
+ printk("%s:%d bad scan\n",
+ __FUNCTION__, __LINE__);
+ break;
+ }
+ rule.smk_subject =
+ smk_from_string((char *)&rule.smk_subject);
+ if (rule.smk_subject == SMK_INVALID)
+ break;
+ rule.smk_object =
+ smk_from_string((char *)&rule.smk_object);
+ if (rule.smk_object == SMK_INVALID)
+ break;
+ rule.smk_access = 0;
+ if (strchr(modestr, 'r') || strchr(modestr, 'R'))
+ rule.smk_access |= MAY_READ;
+ if (strchr(modestr, 'w') || strchr(modestr, 'W'))
+ rule.smk_access |= MAY_WRITE;
+ if (strchr(modestr, 'x') || strchr(modestr, 'X'))
+ rule.smk_access |= MAY_EXEC;
+ if (strchr(modestr, 'a') || strchr(modestr, 'A'))
+ rule.smk_access |= MAY_APPEND;
+ smk_set_access(&rule);
+ printk("%s:%d rule %s %s 0x%x\n",
+ __FUNCTION__, __LINE__,
+ (char *)&rule.smk_subject,
+ (char *)&rule.smk_object,
+ rule.smk_access);
+ }
+
+ kfree(data);
+ return rc;
+}
+
+static struct file_operations smk_load_ops = {
+ .read = smk_read_load,
+ .write = smk_write_load,
+};
+
+static char *smk_digit(char *cp)
+{
+ for (; *cp != '\0'; cp++)
+ if (*cp >= '0' && *cp <= '9')
+ return cp;
+
+ return NULL;
+}
+
+static int smk_cipso_doied;
+static int smk_cipso_written;
+
+/*
+ * This code reaches too deeply into netlabel internals
+ * for comfort, however there is no netlabel KAPI that
+ * allows for kernel based initialization of a CIPSO DOI.
+ * Until Paul and Casey can work out an appropriate
+ * interface Smack will do it this way.
+ */
+static void smk_cipso_doi(void)
+{
+ int rc;
+ struct cipso_v4_doi *doip;
+ struct netlbl_dom_map *ndmp;
+ struct netlbl_audit audit_info;
+
+ if (smk_cipso_doied != 0)
+ return;
+ smk_cipso_doied = 1;
+
+ doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
+ if (doip == NULL)
+ panic("smack: Failed to initialize cipso DOI.\n");
+ doip->map.std = NULL;
+
+ ndmp = kmalloc(sizeof(struct netlbl_dom_map), GFP_KERNEL);
+ if (ndmp == NULL)
+ panic("smack: Failed to initialize cipso ndmp.\n");
+
+ doip->doi = smk_cipso_doi_value;
+ doip->type = CIPSO_V4_MAP_PASS;
+ doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
+ for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
+ doip->tags[rc] = CIPSO_V4_TAG_INVALID;
+
+ rc = cipso_v4_doi_add(doip);
+ if (rc != 0)
+ printk("%s:%d add doi rc = %d\n", __FUNCTION__, __LINE__, rc);
+
+ ndmp->domain = NULL;
+ ndmp->type = NETLBL_NLTYPE_CIPSOV4;
+ ndmp->type_def.cipsov4 = doip;
+
+ rc = netlbl_domhsh_remove_default(&audit_info);
+ if (rc != 0)
+ printk("%s:%d remove rc = %d\n", __FUNCTION__, __LINE__, rc);
+
+ rc = netlbl_domhsh_add_default(ndmp, &audit_info);
+ if (rc != 0)
+ printk("%s:%d add rc = %d\n", __FUNCTION__, __LINE__, rc);
+}
+
+/*
+ * label level[/cat[,cat]]
+ */
+static ssize_t smk_read_cipso(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t bytes;
+ struct smk_cipso_entry *slp = smack_cipso;
+ char sep;
+ char *result;
+ char *cp;
+ char *cbp;
+ int realbytes = 0;
+ int cat = -1;
+ unsigned char m;
+
+ smk_cipso_doi();
+
+ result = kzalloc(smk_cipso_written, GFP_KERNEL);
+ if (result == NULL)
+ return -ENOMEM;
+ cp = result;
+
+ for (slp = smack_cipso; slp != NULL; slp = slp->smk_next) {
+ sprintf(cp, "%-8s %3d", (char *)&slp->smk_smack,slp->smk_level);
+ cp += strlen(cp);
+ cat = 1;
+ sep = '/';
+ for (cbp = (char *)&slp->smk_catset; *cbp != 0; cbp++) {
+ for (m = 0x80; m != 0; m >>= 1) {
+ if ((m & *cbp) != 0) {
+ sprintf(cp, "%c%d", sep, cat);
+ cp += strlen(cp);
+ sep = ',';
+ }
+ cat++;
+ }
+ }
+ *cp++ = '\n';
+ }
+ *cp++ = '\0';
+ realbytes = strlen(result);
+
+ bytes = simple_read_from_buffer(buf, count, ppos, result, realbytes);
+
+ kfree(result);
+
+ return bytes;
+}
+
+static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct smk_cipso_entry *scp;
+ smack_t mapsmack;
+ smack_t mapcatset;
+ int maplevel;
+ ssize_t rc = count;
+ char *data = NULL;
+ char *cp;
+ char *eolp;
+ char *linep;
+ int cat;
+ int i;
+
+ smk_cipso_doi();
+
+ if (!capable(CAP_MAC_OVERRIDE))
+ return -EPERM;
+ /*
+ * No partial writes.
+ */
+ if (*ppos != 0)
+ return -EINVAL;
+ /*
+ * 80 characters per line ought to be enough.
+ */
+ if (count > SMACK_LIST_MAX * 80)
+ return -ENOMEM;
+
+ data = kzalloc(count + 1, GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ if (copy_from_user(data, buf, count) != 0) {
+ kfree(data);
+ return -EFAULT;
+ }
+
+ *(data + count) = '\0';
+ smk_cipso_written += count;
+
+ for (eolp = strchr(data, '\n'), linep = data;
+ eolp != NULL && rc >= 0;
+ linep = eolp + 1, eolp = strchr(linep, '\n')) {
+
+ if (eolp == linep)
+ continue;
+ *eolp = '\0';
+
+ mapsmack = smk_from_string(linep);
+ mapcatset = 0ll;
+
+ if (mapsmack == SMK_INVALID)
+ continue;
+
+ cp = smk_digit(linep + strlen((char *)&mapsmack));
+ if (cp == NULL)
+ continue;
+
+ i = sscanf(cp, "%d", &maplevel);
+ if (i != 1)
+ continue;
+
+ cp = strchr(cp, '/');
+ if (cp != NULL) {
+ cp = smk_digit(cp);
+ if (cp == NULL)
+ continue;
+
+ do {
+ i = sscanf(cp, "%d", &cat);
+ if (i != 1)
+ break;
+ if (cat > SMACK_CIPSO_MAXCAT) {
+ i = 0;
+ break;
+ }
+ smack_catset_bit(cat, &mapcatset);
+
+ cp = strchr(cp, ',');
+ if (cp != NULL)
+ cp = smk_digit(cp);
+ } while (cp != NULL);
+ }
+
+ if (i != 1)
+ continue;
+
+ mutex_lock(&smack_cipso_lock);
+
+ for (scp = smack_cipso; scp != NULL; scp = scp->smk_next)
+ if (mapsmack == scp->smk_smack)
+ break;
+
+ if (scp == NULL) {
+ scp = kzalloc(sizeof(struct smk_cipso_entry),
+ GFP_KERNEL);
+ if (scp == NULL)
+ rc = -ENOMEM;
+ else {
+ scp->smk_next = smack_cipso;
+ scp->smk_smack = mapsmack;
+ scp->smk_level = maplevel;
+ scp->smk_catset = mapcatset;
+ smack_cipso = scp;
+ /*
+ * Add this to ensure that there are
+ * enough bytes for the regurgitation
+ */
+ smk_cipso_written += sizeof(smack_t);
+ }
+ }
+
+ mutex_unlock(&smack_cipso_lock);
+ }
+
+ kfree(data);
+ return rc;
+}
+
+static struct file_operations smk_cipso_ops = {
+ .read = smk_read_cipso,
+ .write = smk_write_cipso,
+};
+
+static ssize_t smk_read_doi(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char temp[80];
+ ssize_t rc;
+
+ if (*ppos != 0)
+ return 0;
+
+ sprintf(temp, "%d", smk_cipso_doi_value);
+ rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
+
+ return rc;
+}
+
+static ssize_t smk_write_doi(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char temp[80];
+ int i;
+
+ if (!capable(CAP_MAC_OVERRIDE))
+ return -EPERM;
+
+ if (count > sizeof(temp))
+ return -EINVAL;
+
+ if (copy_from_user(temp, buf, count) != 0)
+ return -EFAULT;
+
+ if (sscanf(temp, "%d", &i) != 1)
+ return -EINVAL;
+
+ smk_cipso_doi_value = i;
+
+ return count;
+}
+
+static struct file_operations smk_doi_ops = {
+ .read = smk_read_doi,
+ .write = smk_write_doi,
+};
+
+static ssize_t smk_read_direct(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char temp[80];
+ ssize_t rc;
+
+ if (*ppos != 0)
+ return 0;
+
+ sprintf(temp, "%d", smack_cipso_direct);
+ rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
+
+ return rc;
+}
+
+static ssize_t smk_write_direct(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char temp[80];
+ int i;
+
+ if (!capable(CAP_MAC_OVERRIDE))
+ return -EPERM;
+
+ if (count > sizeof(temp))
+ return -EINVAL;
+
+ if (copy_from_user(temp, buf, count) != 0)
+ return -EFAULT;
+
+ if (sscanf(temp, "%d", &i) != 1)
+ return -EINVAL;
+
+ smack_cipso_direct = i;
+
+ return count;
+}
+
+static struct file_operations smk_direct_ops = {
+ .read = smk_read_direct,
+ .write = smk_write_direct,
+};
+
+static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t rc;
+
+ if (count < sizeof(smack_t))
+ return -EINVAL;
+
+ if (*ppos != 0)
+ return 0;
+
+ rc = simple_read_from_buffer(buf, count, ppos, &smack_net_ambient,
+ sizeof(smack_t));
+
+ return rc;
+}
+
+static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ smack_t smack;
+
+ if (!capable(CAP_MAC_OVERRIDE))
+ return -EPERM;
+
+ if (count > sizeof(smack_t))
+ return -EINVAL;
+
+ if (copy_from_user(&smack, buf, count) != 0)
+ return -EFAULT;
+
+ smack = smk_from_buffer(&smack, count);
+ if (smack == SMK_INVALID)
+ return -EINVAL;
+ /*
+ * Better check to be sure this is OK.
+ */
+ smack_net_ambient = smack;
+
+ return count;
+}
+
+static struct file_operations smk_ambient_ops = {
+ .read = smk_read_ambient,
+ .write = smk_write_ambient,
+};
+
+struct option_names {
+ int o_number;
+ char *o_name;
+ char *o_alias;
+};
+
+static struct option_names netlbl_choices[] = {
+ { NETLBL_NLTYPE_RIPSO,
+ NETLBL_NLTYPE_RIPSO_NAME, "ripso" },
+ { NETLBL_NLTYPE_CIPSOV4,
+ NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" },
+ { NETLBL_NLTYPE_CIPSOV4,
+ NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" },
+ { NETLBL_NLTYPE_CIPSOV6,
+ NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" },
+ { NETLBL_NLTYPE_UNLABELED,
+ NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" },
+};
+#define NCHOICES (sizeof(netlbl_choices) / sizeof(struct option_names))
+
+static ssize_t smk_read_nltype(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char bound[40];
+ ssize_t rc;
+ int i;
+
+ if (count < sizeof(smack_t))
+ return -EINVAL;
+
+ if (*ppos != 0)
+ return 0;
+
+ sprintf(bound, "unknown");
+
+ for (i = 0; i < NCHOICES; i++)
+ if (smack_net_nltype == netlbl_choices[i].o_number) {
+ sprintf(bound, "%s", netlbl_choices[i].o_name);
+ break;
+ }
+
+ rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound));
+
+ return rc;
+}
+
+static ssize_t smk_write_nltype(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char bound[40];
+ char *cp;
+ int i;
+
+ if (!capable(CAP_MAC_OVERRIDE))
+ return -EPERM;
+
+ if (count >= 40)
+ return -EINVAL;
+
+ if (copy_from_user(bound, buf, count) != 0)
+ return -EFAULT;
+
+ bound[count] = '\0';
+ cp = strchr(bound, ' ');
+ if (cp != NULL)
+ *cp = '\0';
+ cp = strchr(bound, '\n');
+ if (cp != NULL)
+ *cp = '\0';
+
+ for (i = 0; i < NCHOICES; i++)
+ if ((strcmp(bound, netlbl_choices[i].o_name) == 0) ||
+ (strcmp(bound, netlbl_choices[i].o_alias) == 0)) {
+ smack_net_nltype = netlbl_choices[i].o_number;
+ return count;
+ }
+ /*
+ * Not a valid choice.
+ */
+ return -EINVAL;
+}
+
+static struct file_operations smk_nltype_ops = {
+ .read = smk_read_nltype,
+ .write = smk_write_nltype,
+};
+
+/*
+ * mapping for symlinks
+ */
+#define SMK_TMPPATH_SIZE 32
+#define SMK_TMPPATH_ROOT "/moldy/"
+
+struct smk_link {
+ struct smk_link *sl_next;
+ int sl_inum;
+ char sl_name[SMK_TMPPATH_SIZE];
+ char sl_target[SMK_TMPPATH_SIZE];
+};
+
+static struct super_block *smk_sb = NULL;
+static struct smk_link *smk_links = NULL;
+static int smk_links_count = 0;
+
+static void *smackfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ struct task_smack *tsp = current->security;
+ smack_t *sp = &tsp->smk_task;
+ char *cp;
+ int inum = dentry->d_inode->i_ino;
+ struct smk_link *slp;
+
+ for (slp = smk_links; slp != NULL; slp = slp->sl_next)
+ if (slp->sl_inum == inum)
+ break;
+
+ if (slp == NULL) {
+ printk("%s:%d failed\n", __FUNCTION__, __LINE__);
+ return NULL;
+ }
+ cp = kzalloc(SMK_TMPPATH_SIZE, GFP_KERNEL);
+ if (cp == NULL)
+ return NULL;
+
+ strcpy(cp, slp->sl_target);
+ strcat(cp, (char *)sp);
+ nd_set_link(nd, cp);
+ /*
+ * Unlike the relink below, hang on to the memory allocated
+ * because nd_set_link passes it along.
+ */
+ return NULL;
+}
+
+static int smackfs_readlink(struct dentry *dentry, char __user *buffer, int
buflen)
+{
+ smack_t *csp = smk_of_task(current);
+ char *cp;
+ int len;
+ int inum = dentry->d_inode->i_ino;
+ struct smk_link *slp;
+
+ for (slp = smk_links; slp != NULL; slp = slp->sl_next)
+ if (slp->sl_inum == inum)
+ break;
+
+ if (slp == NULL) {
+ printk("%s:%d failed\n", __FUNCTION__, __LINE__);
+ return -EACCES;
+ }
+
+ cp = kzalloc(SMK_TMPPATH_SIZE, GFP_KERNEL);
+ if (cp == NULL)
+ return -ENOMEM;
+
+ strcpy(cp, slp->sl_target);
+ strcat(cp, (char *)csp);
+ len = strlen(cp);
+ len = (len > buflen) ? buflen : len;
+
+ if (copy_to_user(buffer, cp, len) != 0)
+ len = -EFAULT;
+
+ kfree(cp);
+ return len;
+}
+
+static void smackfs_put_link(struct dentry *dentry, struct nameidata *nd, void
*ptr)
+{
+ kfree(nd_get_link(nd));
+}
+
+static struct inode_operations smackfs_symlink_inode_operations = {
+ .readlink = smackfs_readlink,
+ .follow_link = smackfs_follow_link,
+ .put_link = smackfs_put_link,
+};
+
+static void smk_add_symlink(char *name, char *target)
+{
+ static int inum = SMK_TMP;
+ struct inode *inode;
+ struct dentry *dentry;
+ struct smk_link *slp;
+
+ for (slp = smk_links; slp != NULL; slp = slp->sl_next) {
+ if (strcmp(slp->sl_name, name) != 0)
+ continue;
+ strcpy(slp->sl_target, target);
+ return;
+ }
+
+ slp = kzalloc(sizeof(struct smk_link), GFP_KERNEL);
+ if (slp == NULL)
+ return;
+
+ dentry = d_alloc_name(smk_sb->s_root, name);
+ if (dentry == NULL) {
+ printk("%s:%d link dentry failed\n", __FUNCTION__, __LINE__);
+ return;
+ }
+
+ inode = new_inode(smk_sb);
+ if (inode == NULL) {
+ printk("%s:%d link inode failed\n", __FUNCTION__, __LINE__);
+ return;
+ }
+
+ inode->i_mode = S_IFLNK | S_IRWXUGO;
+ inode->i_uid = 0;
+ inode->i_gid = 0;
+ inode->i_blocks = 0;
+ inode->i_atime = CURRENT_TIME;
+ inode->i_mtime = inode->i_atime;
+ inode->i_ctime = inode->i_atime;
+ inode->i_ino = inum++;
+ inode->i_op = &smackfs_symlink_inode_operations;
+ d_add(dentry, inode);
+
+ strcpy(slp->sl_name, name);
+ strcpy(slp->sl_target, target);
+ slp->sl_inum = inode->i_ino;
+ slp->sl_next = smk_links;
+ smk_links = slp;
+ smk_links_count++;
+
+ return;
+}
+
+static ssize_t smk_read_links(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t bytes = sizeof(struct smk_link) * smk_links_count;
+ struct smk_link *slp;
+ char *result;
+ char *cp;
+
+
+ result = kzalloc(bytes, GFP_KERNEL);
+ if (result == NULL)
+ return -ENOMEM;
+ *result = '\0';
+
+ for (slp = smk_links, cp = result; slp != NULL; slp = slp->sl_next) {
+ sprintf(cp, "%s %s\n", slp->sl_name, slp->sl_target);
+ cp += strlen(slp->sl_name) + strlen(slp->sl_target);
+ }
+
+ bytes = simple_read_from_buffer(buf,count,ppos,result,strlen(result));
+
+ kfree(result);
+
+ return bytes;
+}
+
+static ssize_t smk_write_links(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t rc = count;
+ char *data;
+ char *cp;
+ char name[SMK_TMPPATH_SIZE];
+ char target[SMK_TMPPATH_SIZE];
+
+ /*
+ * No partial writes.
+ */
+ if (*ppos != 0)
+ return -EINVAL;
+ /*
+ * 80 characters per line ought to be enough.
+ */
+ if (count > SMACK_LIST_MAX * 80)
+ return -ENOMEM;
+
+ data = kzalloc(count + 1, GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ if (copy_from_user(data, buf, count) != 0) {
+ kfree(data);
+ return -EFAULT;
+ }
+
+ *(data + count) = '\0';
+
+ for (cp = data - 1; cp != NULL; cp = strchr(cp + 1, '\n')) {
+ if (*++cp == '\0')
+ break;
+ if (sscanf(cp, "%14s %30s\n", name, target) != 2) {
+ printk("%s:%d bad scan\n",
+ __FUNCTION__, __LINE__);
+ break;
+ }
+ smk_add_symlink(name, target);
+ printk("%s:%d add %s -> %s\n",
+ __FUNCTION__, __LINE__, name, target);
+ }
+
+ kfree(data);
+ return rc;
+}
+
+static struct file_operations smk_links_ops = {
+ .read = smk_read_links,
+ .write = smk_write_links,
+};
+
+static int smk_fill_super(struct super_block *sb, void * data, int silent)
+{
+ int rc;
+ struct inode *root_inode;
+
+ static struct tree_descr smack_files[] = {
+ [SMK_LOAD] = {"load", &smk_load_ops, S_IRUGO|S_IWUSR},
+ [SMK_LINKS] = {"links", &smk_links_ops, S_IRUGO|S_IWUSR},
+ [SMK_CIPSO] = {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
+ [SMK_DOI] = {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
+ [SMK_DIRECT] = {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
+ [SMK_AMBIENT] = {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
+ [SMK_NLTYPE] = {"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR},
+ /* last one */ {""}
+ };
+
+ /*
+ * There will be only one smackfs. Casey says so.
+ */
+ smk_sb = sb;
+
+ rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
+ if (rc != 0) {
+ printk(KERN_ERR "%s failed %d while creating inodes\n",
+ __FUNCTION__, rc);
+ return rc;
+ }
+
+ root_inode = sb->s_root->d_inode;
+ root_inode->i_security = new_inode_smack(SMK_FLOOR);
+
+ /*
+ * Create a directory for /smack/tmp
+ */
+ smk_add_symlink("tmp", SMK_TMPPATH_ROOT);
+
+ return 0;
+}
+
+static int smk_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data,
+ struct vfsmount *mnt)
+{
+ return get_sb_single(fs_type, flags, data, smk_fill_super, mnt);
+}
+
+static struct file_system_type smk_fs_type = {
+ .name = "smackfs",
+ .get_sb = smk_get_sb,
+ .kill_sb = kill_litter_super,
+};
+
+static struct vfsmount *smackfs_mount;
+
+static int __init init_smk_fs(void)
+{
+ int err;
+
+ err = register_filesystem(&smk_fs_type);
+ if (!err) {
+ smackfs_mount = kern_mount(&smk_fs_type);
+ if (IS_ERR(smackfs_mount)) {
+ printk(KERN_ERR "smackfs: could not mount!\n");
+ err = PTR_ERR(smackfs_mount);
+ smackfs_mount = NULL;
+ }
+ }
+
+ mutex_init(&smack_list_lock);
+ mutex_init(&smack_cipso_lock);
+ return err;
+}
+
+__initcall(init_smk_fs);
diff -uprN -X linux-2.6.22-base/Documentation/dontdiff
linux-2.6.22-base/security/smack/smack.h linux-2.6.22/security/smack/smack.h
--- linux-2.6.22-base/security/smack/smack.h 1969-12-31 16:00:00.000000000
-0800
+++ linux-2.6.22/security/smack/smack.h 2007-07-24 16:16:27.000000000 -0700
@@ -0,0 +1,246 @@
+/*
+ * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2.
+ *
+ * Author:
+ * Casey Schaufler <casey@schaufler-ca.com>
+ *
+ */
+
+#ifndef _SECURITY_SMACK_H
+#define _SECURITY_SMACK_H
+
+#include <linux/capability.h>
+#include <net/netlabel.h>
+
+/*
+ * A smack_t contains an 8 byte string, 7 characters
+ * and a terminating NULL. Yes, it's short and 12.5%
+ * wasted.
+ *
+ * There is likely to be experimentation with alternative
+ * representations, perhaps a u32 so that it's the same
+ * as what's used in Other LSM MAC schemes, or an array
+ * of 20 chars so that the names aren't so tightly constrained.
+ */
+typedef u64 smack_t;
+
+struct superblock_smack {
+ smack_t smk_root;
+ smack_t smk_floor;
+ smack_t smk_hat;
+ smack_t smk_default;
+ int smk_initialized;
+};
+
+/*
+ * Task smack data
+ */
+struct task_smack {
+ smack_t smk_task; /* label of the task */
+};
+
+/*
+ * Socket smack data
+ */
+struct socket_smack {
+ smack_t smk_out; /* label to associate with outbound packets */
+ smack_t smk_in; /* label to check on incoming packets */
+ smack_t smk_packet; /* label of incoming packet on request */
+};
+
+/*
+ * Inode smack data
+ */
+struct inode_smack {
+ smack_t smk_inode; /* label of the fso */
+ struct mutex smk_lock; /* initialization lock */
+ int smk_flags; /* smack inode flags */
+};
+
+#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
+
+/*
+ * A label access rule.
+ */
+struct smack_rule {
+ smack_t smk_subject;
+ smack_t smk_object;
+ int smk_access;
+};
+
+/*
+ * An entry in the table of permitted label accesses.
+ */
+struct smk_list_entry {
+ struct smk_list_entry *smk_next;
+ struct smack_rule smk_rule;
+};
+
+/*
+ * An entry in the table mapping smack values to
+ * CIPSO level/category-set values.
+ */
+struct smk_cipso_entry {
+ struct smk_cipso_entry *smk_next;
+ int smk_level; /* for CIPSO */
+ smack_t smk_smack;
+ smack_t smk_catset;
+};
+
+/*
+ * Mount options
+ */
+#define SMK_FSDEFAULT "smackfsdef="
+#define SMK_FSFLOOR "smackfsfloor="
+#define SMK_FSHAT "smackfshat="
+#define SMK_FSROOT "smackfsroot="
+
+/*
+ * xattr names
+ */
+#define XATTR_SMACK_SUFFIX "SMACK64"
+#define XATTR_SMACK_IPIN "SMACK64IPIN"
+#define XATTR_SMACK_IPOUT "SMACK64IPOUT"
+#define XATTR_SMACK_PACKET "SMACK64PACKET"
+#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
+
+/*
+ * smackfs macic number
+ */
+#define SMACK_MAGIC 0x43415d53 /* "SMAC" */
+
+/*
+ * A limit on the number of entries in the lists
+ * makes some of the list administration easier.
+ */
+#define SMACK_LIST_MAX 10000
+
+/*
+ * CIPSO defaults.
+ */
+#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
+#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
+#define SMACK_CIPSO_MAXCAT 63 /* Bigger gets harder */
+
+/*
+ * Pre-defined smack label values.
+ */
+#define SMK_INVALID 0x00LL /* NULLSTRING */
+#define SMK_HAT 0x5ELL /* "^" */
+#define SMK_FLOOR 0x5FLL /* "_" */
+#define SMK_STAR 0x2ALL /* "*" */
+#define SMK_HUH 0x3FLL /* "?" */
+#define SMK_UNSET 0x5445534e55LL /* "UNSET" */
+/*
+ * There's a place in the CIPSO initialization that
+ * wants this.
+ */
+#define SMK32_FLOOR 0x5F /* "_" */
+
+#define SMK_MAXLEN (sizeof(smack_t) - 1) /* NULL terminated */
+/*
+ * Just to make the common cases easier to deal with
+ */
+#define MAY_ANY (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
+#define MAY_ANYREAD (MAY_READ | MAY_EXEC)
+#define MAY_ANYWRITE (MAY_WRITE | MAY_APPEND)
+#define MAY_READWRITE (MAY_READ | MAY_WRITE)
+#define MAY_NOT 0
+
+/*
+ * There are not enough CAP bits available to make this
+ * real, so Casey borrowed the capability that looks to
+ * him like it has the best balance of similarity amd
+ * low use.
+ */
+#define CAP_MAC_OVERRIDE CAP_LINUX_IMMUTABLE
+
+/*
+ * These functions are in smack_lsm.c
+ */
+struct inode_smack *new_inode_smack(smack_t);
+
+/*
+ * These functions are in smack_access.c
+ */
+int smk_access(smack_t *, smack_t *, int);
+int smk_curacc(smack_t *, u32);
+smack_t smk_from_string(char *);
+
+/*
+ * Stricly for CIPSO level manipulation.
+ * Set the category bit number in a smack_t.
+ */
+static inline void smack_catset_bit(int cat, smack_t *catsetp)
+{
+ char *cp = (char *)catsetp;
+
+ if (cat > sizeof(smack_t) * 8)
+ return;
+
+ cp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
+}
+
+/*
+ * Present a pointer to the smack label in a task blob.
+ */
+static inline smack_t *smk_of_task(const struct task_struct *tsp)
+{
+ struct task_smack *stp = tsp->security;
+ return &stp->smk_task;
+}
+
+/*
+ * Present a pointer to the smack label in an inode blob.
+ */
+static inline smack_t *smk_of_inode(const struct inode *isp)
+{
+ struct inode_smack *sip = isp->i_security;
+ return &sip->smk_inode;
+}
+
+/*
+ * allocate a new smack label.
+ */
+static inline smack_t *new_smack_t(smack_t value)
+{
+ smack_t *bp;
+
+ bp = kzalloc(sizeof(smack_t), GFP_KERNEL);
+ if (bp != NULL)
+ *bp = value;
+
+ return bp;
+}
+
+/*
+ * Copy a smack label from the buffer. The smack label may
+ * actually be shorter than size. In any case, null pad
+ * beyond the end.
+ */
+static inline smack_t smk_from_buffer(const void *value, int size)
+{
+ smack_t smack;
+ char *from = (char *)value;
+ char *to = (char *)&smack;
+ int found;
+ int i;
+
+ for (i = 0, found = 0; i < sizeof(smack_t); i++, to++) {
+ if (found)
+ *to = '\0';
+ else if (i >= size || *from > '~' || *from <= ' ') {
+ *to = '\0';
+ found = 1;
+ }
+ else
+ *to = *from++;
+ }
+ return smack;
+}
+
+#endif /* _SECURITY_SMACK_H */

Casey Schaufler
casey@schaufler-ca.com
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