X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=security%2Fselinux%2Fselinuxfs.c;h=0341567665b3b32eab4ac7bfa717c5c0ec00d908;hb=44cad261025c04327fd7e847a7088fd3031b0c3e;hp=aca099aa2ed3d743e65d38a4c77da690e4609e2f;hpb=f697b677620d04d8c77841745727de85f7e948b1;p=linux-2.6 diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index aca099aa2e..0341567665 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -2,6 +2,11 @@ * * Added conditional policy language extensions * + * Updated: Hewlett-Packard + * + * Added support for the policy capability bitmap + * + * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. * Copyright (C) 2003 - 2004 Tresys Technology, LLC * Copyright (C) 2004 Red Hat, Inc., James Morris * This program is free software; you can redistribute it and/or modify @@ -35,6 +40,11 @@ #include "objsec.h" #include "conditional.h" +/* Policy capability filenames */ +static char *policycap_names[] = { + "network_peer_controls" +}; + unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT @@ -65,8 +75,16 @@ static DEFINE_MUTEX(sel_mutex); /* global data for booleans */ static struct dentry *bool_dir = NULL; static int bool_num = 0; +static char **bool_pending_names; static int *bool_pending_values = NULL; +/* global data for classes */ +static struct dentry *class_dir = NULL; +static unsigned long last_class_ino; + +/* global data for policy capabilities */ +static struct dentry *policycap_dir = NULL; + extern void selnl_notify_setenforce(int val); /* Check whether a task is allowed to use a security operation. */ @@ -99,14 +117,18 @@ enum sel_inos { SEL_MEMBER, /* compute polyinstantiation membership decision */ SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ SEL_COMPAT_NET, /* whether to use old compat network packet controls */ + SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ + SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ SEL_INO_NEXT, /* The next inode number to use */ }; static unsigned long sel_last_ino = SEL_INO_NEXT - 1; -#define SEL_INITCON_INO_OFFSET 0x01000000 -#define SEL_BOOL_INO_OFFSET 0x02000000 -#define SEL_INO_MASK 0x00ffffff +#define SEL_INITCON_INO_OFFSET 0x01000000 +#define SEL_BOOL_INO_OFFSET 0x02000000 +#define SEL_CLASS_INO_OFFSET 0x04000000 +#define SEL_POLICYCAP_INO_OFFSET 0x08000000 +#define SEL_INO_MASK 0x00ffffff #define TMPBUFLEN 12 static ssize_t sel_read_enforce(struct file *filp, char __user *buf, @@ -150,9 +172,10 @@ static ssize_t sel_write_enforce(struct file * file, const char __user * buf, if (length) goto out; audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, - "enforcing=%d old_enforcing=%d auid=%u", new_value, - selinux_enforcing, - audit_get_loginuid(current->audit_context)); + "enforcing=%d old_enforcing=%d auid=%u ses=%u", + new_value, selinux_enforcing, + audit_get_loginuid(current), + audit_get_sessionid(current)); selinux_enforcing = new_value; if (selinux_enforcing) avc_ss_reset(0); @@ -172,6 +195,23 @@ static const struct file_operations sel_enforce_ops = { .write = sel_write_enforce, }; +static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + char tmpbuf[TMPBUFLEN]; + ssize_t length; + ino_t ino = filp->f_path.dentry->d_inode->i_ino; + int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? + security_get_reject_unknown() : !security_get_allow_unknown(); + + length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); +} + +static const struct file_operations sel_handle_unknown_ops = { + .read = sel_read_handle_unknown, +}; + #ifdef CONFIG_SECURITY_SELINUX_DISABLE static ssize_t sel_write_disable(struct file * file, const char __user * buf, size_t count, loff_t *ppos) @@ -204,8 +244,9 @@ static ssize_t sel_write_disable(struct file * file, const char __user * buf, if (length < 0) goto out; audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, - "selinux=0 auid=%u", - audit_get_loginuid(current->audit_context)); + "selinux=0 auid=%u ses=%u", + audit_get_loginuid(current), + audit_get_sessionid(current)); } length = count; @@ -237,6 +278,12 @@ static const struct file_operations sel_policyvers_ops = { /* declaration for sel_write_load */ static int sel_make_bools(void); +static int sel_make_classes(void); +static int sel_make_policycap(void); + +/* declaration for sel_make_class_dirs */ +static int sel_make_dir(struct inode *dir, struct dentry *dentry, + unsigned long *ino); static ssize_t sel_read_mls(struct file *filp, char __user *buf, size_t count, loff_t *ppos) @@ -287,13 +334,33 @@ static ssize_t sel_write_load(struct file * file, const char __user * buf, goto out; ret = sel_make_bools(); + if (ret) { + length = ret; + goto out1; + } + + ret = sel_make_classes(); + if (ret) { + length = ret; + goto out1; + } + + ret = sel_make_policycap(); if (ret) length = ret; else length = count; + +out1: + + printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n", + (security_get_reject_unknown() ? "reject" : + (security_get_allow_unknown() ? "allow" : "deny"))); + audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, - "policy loaded auid=%u", - audit_get_loginuid(current->audit_context)); + "policy loaded auid=%u ses=%u", + audit_get_loginuid(current), + audit_get_sessionid(current)); out: mutex_unlock(&sel_mutex); vfree(data); @@ -790,15 +857,16 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf, ssize_t length; ssize_t ret; int cur_enforcing; - struct inode *inode; + struct inode *inode = filep->f_path.dentry->d_inode; + unsigned index = inode->i_ino & SEL_INO_MASK; + const char *name = filep->f_path.dentry->d_name.name; mutex_lock(&sel_mutex); - ret = -EFAULT; - - /* check to see if this file has been deleted */ - if (!filep->f_op) + if (index >= bool_num || strcmp(name, bool_pending_names[index])) { + ret = -EINVAL; goto out; + } if (count > PAGE_SIZE) { ret = -EINVAL; @@ -809,15 +877,13 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf, goto out; } - inode = filep->f_path.dentry->d_inode; - cur_enforcing = security_get_bool_value(inode->i_ino&SEL_INO_MASK); + cur_enforcing = security_get_bool_value(index); if (cur_enforcing < 0) { ret = cur_enforcing; goto out; } - length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, - bool_pending_values[inode->i_ino&SEL_INO_MASK]); + bool_pending_values[index]); ret = simple_read_from_buffer(buf, count, ppos, page, length); out: mutex_unlock(&sel_mutex); @@ -830,9 +896,11 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, size_t count, loff_t *ppos) { char *page = NULL; - ssize_t length = -EFAULT; + ssize_t length; int new_value; - struct inode *inode; + struct inode *inode = filep->f_path.dentry->d_inode; + unsigned index = inode->i_ino & SEL_INO_MASK; + const char *name = filep->f_path.dentry->d_name.name; mutex_lock(&sel_mutex); @@ -840,16 +908,19 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, if (length) goto out; - /* check to see if this file has been deleted */ - if (!filep->f_op) + if (index >= bool_num || strcmp(name, bool_pending_names[index])) { + length = -EINVAL; goto out; + } if (count >= PAGE_SIZE) { length = -ENOMEM; goto out; } + if (*ppos != 0) { /* No partial writes. */ + length = -EINVAL; goto out; } page = (char*)get_zeroed_page(GFP_KERNEL); @@ -858,6 +929,7 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, goto out; } + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -868,8 +940,7 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, if (new_value) new_value = 1; - inode = filep->f_path.dentry->d_inode; - bool_pending_values[inode->i_ino&SEL_INO_MASK] = new_value; + bool_pending_values[index] = new_value; length = count; out: @@ -889,7 +960,7 @@ static ssize_t sel_commit_bools_write(struct file *filep, size_t count, loff_t *ppos) { char *page = NULL; - ssize_t length = -EFAULT; + ssize_t length; int new_value; mutex_lock(&sel_mutex); @@ -898,10 +969,6 @@ static ssize_t sel_commit_bools_write(struct file *filep, if (length) goto out; - /* check to see if this file has been deleted */ - if (!filep->f_op) - goto out; - if (count >= PAGE_SIZE) { length = -ENOMEM; goto out; @@ -916,6 +983,7 @@ static ssize_t sel_commit_bools_write(struct file *filep, goto out; } + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -940,12 +1008,9 @@ static const struct file_operations sel_commit_bools_ops = { .write = sel_commit_bools_write, }; -/* delete booleans - partial revoke() from - * fs/proc/generic.c proc_kill_inodes */ -static void sel_remove_bools(struct dentry *de) +static void sel_remove_entries(struct dentry *de) { - struct list_head *p, *node; - struct super_block *sb = de->d_sb; + struct list_head *node; spin_lock(&dcache_lock); node = de->d_subdirs.next; @@ -965,18 +1030,6 @@ static void sel_remove_bools(struct dentry *de) } spin_unlock(&dcache_lock); - - file_list_lock(); - list_for_each(p, &sb->s_files) { - struct file * filp = list_entry(p, struct file, f_u.fu_list); - struct dentry * dentry = filp->f_path.dentry; - - if (dentry->d_parent != de) { - continue; - } - filp->f_op = NULL; - } - file_list_unlock(); } #define BOOL_DIR_NAME "booleans" @@ -995,10 +1048,12 @@ static int sel_make_bools(void) u32 sid; /* remove any existing files */ + kfree(bool_pending_names); kfree(bool_pending_values); + bool_pending_names = NULL; bool_pending_values = NULL; - sel_remove_bools(dir); + sel_remove_entries(dir); if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) return -ENOMEM; @@ -1037,18 +1092,19 @@ static int sel_make_bools(void) d_add(dentry, inode); } bool_num = num; + bool_pending_names = names; bool_pending_values = values; out: free_page((unsigned long)page); + return ret; +err: if (names) { for (i = 0; i < num; i++) kfree(names[i]); kfree(names); } - return ret; -err: kfree(values); - sel_remove_bools(dir); + sel_remove_entries(dir); ret = -ENOMEM; goto out; } @@ -1190,7 +1246,7 @@ static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) { } -static struct seq_operations sel_avc_cache_stats_seq_ops = { +static const struct seq_operations sel_avc_cache_stats_seq_ops = { .start = sel_avc_stats_seq_start, .next = sel_avc_stats_seq_next, .show = sel_avc_stats_seq_show, @@ -1294,7 +1350,275 @@ out: return ret; } -static int sel_make_dir(struct inode *dir, struct dentry *dentry) +static inline unsigned int sel_div(unsigned long a, unsigned long b) +{ + return a / b - (a % b < 0); +} + +static inline unsigned long sel_class_to_ino(u16 class) +{ + return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; +} + +static inline u16 sel_ino_to_class(unsigned long ino) +{ + return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); +} + +static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) +{ + return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; +} + +static inline u32 sel_ino_to_perm(unsigned long ino) +{ + return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); +} + +static ssize_t sel_read_class(struct file * file, char __user *buf, + size_t count, loff_t *ppos) +{ + ssize_t rc, len; + char *page; + unsigned long ino = file->f_path.dentry->d_inode->i_ino; + + page = (char *)__get_free_page(GFP_KERNEL); + if (!page) { + rc = -ENOMEM; + goto out; + } + + len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); + rc = simple_read_from_buffer(buf, count, ppos, page, len); + free_page((unsigned long)page); +out: + return rc; +} + +static const struct file_operations sel_class_ops = { + .read = sel_read_class, +}; + +static ssize_t sel_read_perm(struct file * file, char __user *buf, + size_t count, loff_t *ppos) +{ + ssize_t rc, len; + char *page; + unsigned long ino = file->f_path.dentry->d_inode->i_ino; + + page = (char *)__get_free_page(GFP_KERNEL); + if (!page) { + rc = -ENOMEM; + goto out; + } + + len = snprintf(page, PAGE_SIZE,"%d", sel_ino_to_perm(ino)); + rc = simple_read_from_buffer(buf, count, ppos, page, len); + free_page((unsigned long)page); +out: + return rc; +} + +static const struct file_operations sel_perm_ops = { + .read = sel_read_perm, +}; + +static ssize_t sel_read_policycap(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + int value; + char tmpbuf[TMPBUFLEN]; + ssize_t length; + unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; + + value = security_policycap_supported(i_ino & SEL_INO_MASK); + length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); + + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); +} + +static const struct file_operations sel_policycap_ops = { + .read = sel_read_policycap, +}; + +static int sel_make_perm_files(char *objclass, int classvalue, + struct dentry *dir) +{ + int i, rc = 0, nperms; + char **perms; + + rc = security_get_permissions(objclass, &perms, &nperms); + if (rc) + goto out; + + for (i = 0; i < nperms; i++) { + struct inode *inode; + struct dentry *dentry; + + dentry = d_alloc_name(dir, perms[i]); + if (!dentry) { + rc = -ENOMEM; + goto out1; + } + + inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); + if (!inode) { + rc = -ENOMEM; + goto out1; + } + inode->i_fop = &sel_perm_ops; + /* i+1 since perm values are 1-indexed */ + inode->i_ino = sel_perm_to_ino(classvalue, i+1); + d_add(dentry, inode); + } + +out1: + for (i = 0; i < nperms; i++) + kfree(perms[i]); + kfree(perms); +out: + return rc; +} + +static int sel_make_class_dir_entries(char *classname, int index, + struct dentry *dir) +{ + struct dentry *dentry = NULL; + struct inode *inode = NULL; + int rc; + + dentry = d_alloc_name(dir, "index"); + if (!dentry) { + rc = -ENOMEM; + goto out; + } + + inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); + if (!inode) { + rc = -ENOMEM; + goto out; + } + + inode->i_fop = &sel_class_ops; + inode->i_ino = sel_class_to_ino(index); + d_add(dentry, inode); + + dentry = d_alloc_name(dir, "perms"); + if (!dentry) { + rc = -ENOMEM; + goto out; + } + + rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); + if (rc) + goto out; + + rc = sel_make_perm_files(classname, index, dentry); + +out: + return rc; +} + +static void sel_remove_classes(void) +{ + struct list_head *class_node; + + list_for_each(class_node, &class_dir->d_subdirs) { + struct dentry *class_subdir = list_entry(class_node, + struct dentry, d_u.d_child); + struct list_head *class_subdir_node; + + list_for_each(class_subdir_node, &class_subdir->d_subdirs) { + struct dentry *d = list_entry(class_subdir_node, + struct dentry, d_u.d_child); + + if (d->d_inode) + if (d->d_inode->i_mode & S_IFDIR) + sel_remove_entries(d); + } + + sel_remove_entries(class_subdir); + } + + sel_remove_entries(class_dir); +} + +static int sel_make_classes(void) +{ + int rc = 0, nclasses, i; + char **classes; + + /* delete any existing entries */ + sel_remove_classes(); + + rc = security_get_classes(&classes, &nclasses); + if (rc < 0) + goto out; + + /* +2 since classes are 1-indexed */ + last_class_ino = sel_class_to_ino(nclasses+2); + + for (i = 0; i < nclasses; i++) { + struct dentry *class_name_dir; + + class_name_dir = d_alloc_name(class_dir, classes[i]); + if (!class_name_dir) { + rc = -ENOMEM; + goto out1; + } + + rc = sel_make_dir(class_dir->d_inode, class_name_dir, + &last_class_ino); + if (rc) + goto out1; + + /* i+1 since class values are 1-indexed */ + rc = sel_make_class_dir_entries(classes[i], i+1, + class_name_dir); + if (rc) + goto out1; + } + +out1: + for (i = 0; i < nclasses; i++) + kfree(classes[i]); + kfree(classes); +out: + return rc; +} + +static int sel_make_policycap(void) +{ + unsigned int iter; + struct dentry *dentry = NULL; + struct inode *inode = NULL; + + sel_remove_entries(policycap_dir); + + for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { + if (iter < ARRAY_SIZE(policycap_names)) + dentry = d_alloc_name(policycap_dir, + policycap_names[iter]); + else + dentry = d_alloc_name(policycap_dir, "unknown"); + + if (dentry == NULL) + return -ENOMEM; + + inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); + if (inode == NULL) + return -ENOMEM; + + inode->i_fop = &sel_policycap_ops; + inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; + d_add(dentry, inode); + } + + return 0; +} + +static int sel_make_dir(struct inode *dir, struct dentry *dentry, + unsigned long *ino) { int ret = 0; struct inode *inode; @@ -1306,7 +1630,7 @@ static int sel_make_dir(struct inode *dir, struct dentry *dentry) } inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; - inode->i_ino = ++sel_last_ino; + inode->i_ino = ++(*ino); /* directory inodes start off with i_nlink == 2 (for "." entry) */ inc_nlink(inode); d_add(dentry, inode); @@ -1338,6 +1662,8 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR}, + [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, + [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, /* last one */ {""} }; ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); @@ -1352,7 +1678,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) goto err; } - ret = sel_make_dir(root_inode, dentry); + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); if (ret) goto err; @@ -1385,7 +1711,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) goto err; } - ret = sel_make_dir(root_inode, dentry); + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); if (ret) goto err; @@ -1399,7 +1725,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) goto err; } - ret = sel_make_dir(root_inode, dentry); + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); if (ret) goto err; @@ -1407,6 +1733,30 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) if (ret) goto err; + dentry = d_alloc_name(sb->s_root, "class"); + if (!dentry) { + ret = -ENOMEM; + goto err; + } + + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); + if (ret) + goto err; + + class_dir = dentry; + + dentry = d_alloc_name(sb->s_root, "policy_capabilities"); + if (!dentry) { + ret = -ENOMEM; + goto err; + } + + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); + if (ret) + goto err; + + policycap_dir = dentry; + out: return ret; err: