diff options
Diffstat (limited to 'ANDROID_3.4.5/security/smack/smackfs.c')
| -rw-r--r-- | ANDROID_3.4.5/security/smack/smackfs.c | 1620 |
1 files changed, 0 insertions, 1620 deletions
diff --git a/ANDROID_3.4.5/security/smack/smackfs.c b/ANDROID_3.4.5/security/smack/smackfs.c deleted file mode 100644 index 038811cb..00000000 --- a/ANDROID_3.4.5/security/smack/smackfs.c +++ /dev/null @@ -1,1620 +0,0 @@ -/* - * 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. - * - * Authors: - * Casey Schaufler <casey@schaufler-ca.com> - * Ahmed S. Darwish <darwish.07@gmail.com> - * - * Special thanks to the authors of selinuxfs. - * - * 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 <linux/slab.h> -#include <net/net_namespace.h> -#include <net/netlabel.h> -#include <net/cipso_ipv4.h> -#include <linux/seq_file.h> -#include <linux/ctype.h> -#include <linux/audit.h> -#include "smack.h" - -/* - * smackfs pseudo filesystem. - */ - -enum smk_inos { - SMK_ROOT_INO = 2, - SMK_LOAD = 3, /* load policy */ - SMK_CIPSO = 4, /* load label -> CIPSO mapping */ - SMK_DOI = 5, /* CIPSO DOI */ - SMK_DIRECT = 6, /* CIPSO level indicating direct label */ - SMK_AMBIENT = 7, /* internet ambient label */ - SMK_NETLBLADDR = 8, /* single label hosts */ - SMK_ONLYCAP = 9, /* the only "capable" label */ - SMK_LOGGING = 10, /* logging */ - SMK_LOAD_SELF = 11, /* task specific rules */ - SMK_ACCESSES = 12, /* access policy */ -}; - -/* - * List locks - */ -static DEFINE_MUTEX(smack_list_lock); -static DEFINE_MUTEX(smack_cipso_lock); -static DEFINE_MUTEX(smack_ambient_lock); -static DEFINE_MUTEX(smk_netlbladdr_lock); - -/* - * This is the "ambient" label for network traffic. - * If it isn't somehow marked, use this. - * It can be reset via smackfs/ambient - */ -char *smack_net_ambient = smack_known_floor.smk_known; - -/* - * 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; - -/* - * Unless a process is running with this label even - * having CAP_MAC_OVERRIDE isn't enough to grant - * privilege to violate MAC policy. If no label is - * designated (the NULL case) capabilities apply to - * everyone. It is expected that the hat (^) label - * will be used if any label is used. - */ -char *smack_onlycap; - -/* - * Certain IP addresses may be designated as single label hosts. - * Packets are sent there unlabeled, but only from tasks that - * can write to the specified label. - */ - -LIST_HEAD(smk_netlbladdr_list); - -/* - * Rule lists are maintained for each label. - * This master list is just for reading /smack/load. - */ -struct smack_master_list { - struct list_head list; - struct smack_rule *smk_rule; -}; - -LIST_HEAD(smack_rule_list); - -static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; - -const char *smack_cipso_option = SMACK_CIPSO_OPTION; - -/* - * Values for parsing cipso rules - * SMK_DIGITLEN: Length of a digit field in a rule. - * SMK_CIPSOMIN: Minimum possible cipso rule length. - * SMK_CIPSOMAX: Maximum possible cipso rule length. - */ -#define SMK_DIGITLEN 4 -#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) -#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) - -/* - * Values for parsing MAC rules - * SMK_ACCESS: Maximum possible combination of access permissions - * SMK_ACCESSLEN: Maximum length for a rule access field - * SMK_LOADLEN: Smack rule length - */ -#define SMK_OACCESS "rwxa" -#define SMK_ACCESS "rwxat" -#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) -#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) -#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) -#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) - -/** - * smk_netlabel_audit_set - fill a netlbl_audit struct - * @nap: structure to fill - */ -static void smk_netlabel_audit_set(struct netlbl_audit *nap) -{ - nap->loginuid = audit_get_loginuid(current); - nap->sessionid = audit_get_sessionid(current); - nap->secid = smack_to_secid(smk_of_current()); -} - -/* - * Values for parsing single label host rules - * "1.2.3.4 X" - * "192.168.138.129/32 abcdefghijklmnopqrstuvw" - */ -#define SMK_NETLBLADDRMIN 9 -#define SMK_NETLBLADDRMAX 42 - -/** - * smk_set_access - add a rule to the rule list - * @srp: the new rule to add - * @rule_list: the list of rules - * @rule_lock: the rule list lock - * - * Looks through the current subject/object/access list for - * the subject/object pair and replaces the access that was - * there. If the pair isn't found add it with the specified - * access. - * - * Returns 1 if a rule was found to exist already, 0 if it is new - * Returns 0 if nothing goes wrong or -ENOMEM if it fails - * during the allocation of the new pair to add. - */ -static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list, - struct mutex *rule_lock) -{ - struct smack_rule *sp; - int found = 0; - - mutex_lock(rule_lock); - - /* - * Because the object label is less likely to match - * than the subject label check it first - */ - list_for_each_entry_rcu(sp, rule_list, list) { - if (sp->smk_object == srp->smk_object && - sp->smk_subject == srp->smk_subject) { - found = 1; - sp->smk_access = srp->smk_access; - break; - } - } - if (found == 0) - list_add_rcu(&srp->list, rule_list); - - mutex_unlock(rule_lock); - - return found; -} - -/** - * smk_parse_rule - parse Smack rule from load string - * @data: string to be parsed whose size is SMK_LOADLEN - * @rule: Smack rule - * @import: if non-zero, import labels - */ -static int smk_parse_rule(const char *data, struct smack_rule *rule, int import) -{ - char smack[SMK_LABELLEN]; - struct smack_known *skp; - - if (import) { - rule->smk_subject = smk_import(data, 0); - if (rule->smk_subject == NULL) - return -1; - - rule->smk_object = smk_import(data + SMK_LABELLEN, 0); - if (rule->smk_object == NULL) - return -1; - } else { - smk_parse_smack(data, 0, smack); - skp = smk_find_entry(smack); - if (skp == NULL) - return -1; - rule->smk_subject = skp->smk_known; - - smk_parse_smack(data + SMK_LABELLEN, 0, smack); - skp = smk_find_entry(smack); - if (skp == NULL) - return -1; - rule->smk_object = skp->smk_known; - } - - rule->smk_access = 0; - - switch (data[SMK_LABELLEN + SMK_LABELLEN]) { - case '-': - break; - case 'r': - case 'R': - rule->smk_access |= MAY_READ; - break; - default: - return -1; - } - - switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { - case '-': - break; - case 'w': - case 'W': - rule->smk_access |= MAY_WRITE; - break; - default: - return -1; - } - - switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { - case '-': - break; - case 'x': - case 'X': - rule->smk_access |= MAY_EXEC; - break; - default: - return -1; - } - - switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { - case '-': - break; - case 'a': - case 'A': - rule->smk_access |= MAY_APPEND; - break; - default: - return -1; - } - - switch (data[SMK_LABELLEN + SMK_LABELLEN + 4]) { - case '-': - break; - case 't': - case 'T': - rule->smk_access |= MAY_TRANSMUTE; - break; - default: - return -1; - } - - return 0; -} - -/** - * smk_write_load_list - write() for any /smack/load - * @file: file pointer, not actually used - * @buf: where to get the data from - * @count: bytes sent - * @ppos: where to start - must be 0 - * @rule_list: the list of rules to write to - * @rule_lock: lock for the rule list - * - * Get one smack access rule from above. - * The format is exactly: - * char subject[SMK_LABELLEN] - * char object[SMK_LABELLEN] - * char access[SMK_ACCESSLEN] - * - * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. - */ -static ssize_t smk_write_load_list(struct file *file, const char __user *buf, - size_t count, loff_t *ppos, - struct list_head *rule_list, - struct mutex *rule_lock) -{ - struct smack_master_list *smlp; - struct smack_known *skp; - struct smack_rule *rule; - char *data; - int rc = -EINVAL; - int load = 0; - - /* - * No partial writes. - * Enough data must be present. - */ - if (*ppos != 0) - return -EINVAL; - /* - * Minor hack for backward compatibility - */ - if (count < (SMK_OLOADLEN) || count > SMK_LOADLEN) - return -EINVAL; - - data = kzalloc(SMK_LOADLEN, GFP_KERNEL); - if (data == NULL) - return -ENOMEM; - - if (copy_from_user(data, buf, count) != 0) { - rc = -EFAULT; - goto out; - } - - /* - * More on the minor hack for backward compatibility - */ - if (count == (SMK_OLOADLEN)) - data[SMK_OLOADLEN] = '-'; - - rule = kzalloc(sizeof(*rule), GFP_KERNEL); - if (rule == NULL) { - rc = -ENOMEM; - goto out; - } - - if (smk_parse_rule(data, rule, 1)) - goto out_free_rule; - - if (rule_list == NULL) { - load = 1; - skp = smk_find_entry(rule->smk_subject); - rule_list = &skp->smk_rules; - rule_lock = &skp->smk_rules_lock; - } - - rc = count; - /* - * If this is "load" as opposed to "load-self" and a new rule - * it needs to get added for reporting. - * smk_set_access returns true if there was already a rule - * for the subject/object pair, and false if it was new. - */ - if (load && !smk_set_access(rule, rule_list, rule_lock)) { - smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); - if (smlp != NULL) { - smlp->smk_rule = rule; - list_add_rcu(&smlp->list, &smack_rule_list); - } else - rc = -ENOMEM; - goto out; - } - -out_free_rule: - kfree(rule); -out: - kfree(data); - return rc; -} - -/* - * Core logic for smackfs seq list operations. - */ - -static void *smk_seq_start(struct seq_file *s, loff_t *pos, - struct list_head *head) -{ - struct list_head *list; - - /* - * This is 0 the first time through. - */ - if (s->index == 0) - s->private = head; - - if (s->private == NULL) - return NULL; - - list = s->private; - if (list_empty(list)) - return NULL; - - if (s->index == 0) - return list->next; - return list; -} - -static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, - struct list_head *head) -{ - struct list_head *list = v; - - if (list_is_last(list, head)) { - s->private = NULL; - return NULL; - } - s->private = list->next; - return list->next; -} - -static void smk_seq_stop(struct seq_file *s, void *v) -{ - /* No-op */ -} - -/* - * Seq_file read operations for /smack/load - */ - -static void *load_seq_start(struct seq_file *s, loff_t *pos) -{ - return smk_seq_start(s, pos, &smack_rule_list); -} - -static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) -{ - return smk_seq_next(s, v, pos, &smack_rule_list); -} - -static int load_seq_show(struct seq_file *s, void *v) -{ - struct list_head *list = v; - struct smack_master_list *smlp = - list_entry(list, struct smack_master_list, list); - struct smack_rule *srp = smlp->smk_rule; - - seq_printf(s, "%s %s", (char *)srp->smk_subject, - (char *)srp->smk_object); - - seq_putc(s, ' '); - - if (srp->smk_access & MAY_READ) - seq_putc(s, 'r'); - if (srp->smk_access & MAY_WRITE) - seq_putc(s, 'w'); - if (srp->smk_access & MAY_EXEC) - seq_putc(s, 'x'); - if (srp->smk_access & MAY_APPEND) - seq_putc(s, 'a'); - if (srp->smk_access & MAY_TRANSMUTE) - seq_putc(s, 't'); - if (srp->smk_access == 0) - seq_putc(s, '-'); - - seq_putc(s, '\n'); - - return 0; -} - -static const struct seq_operations load_seq_ops = { - .start = load_seq_start, - .next = load_seq_next, - .show = load_seq_show, - .stop = smk_seq_stop, -}; - -/** - * smk_open_load - open() for /smack/load - * @inode: inode structure representing file - * @file: "load" file pointer - * - * For reading, use load_seq_* seq_file reading operations. - */ -static int smk_open_load(struct inode *inode, struct file *file) -{ - return seq_open(file, &load_seq_ops); -} - -/** - * smk_write_load - write() for /smack/load - * @file: file pointer, not actually used - * @buf: where to get the data from - * @count: bytes sent - * @ppos: where to start - must be 0 - * - */ -static ssize_t smk_write_load(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - - /* - * Must have privilege. - * No partial writes. - * Enough data must be present. - */ - if (!capable(CAP_MAC_ADMIN)) - return -EPERM; - - return smk_write_load_list(file, buf, count, ppos, NULL, NULL); -} - -static const struct file_operations smk_load_ops = { - .open = smk_open_load, - .read = seq_read, - .llseek = seq_lseek, - .write = smk_write_load, - .release = seq_release, -}; - -/** - * smk_cipso_doi - initialize the CIPSO domain - */ -static void smk_cipso_doi(void) -{ - int rc; - struct cipso_v4_doi *doip; - struct netlbl_audit nai; - - smk_netlabel_audit_set(&nai); - - rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); - if (rc != 0) - printk(KERN_WARNING "%s:%d remove rc = %d\n", - __func__, __LINE__, rc); - - doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); - if (doip == NULL) - panic("smack: Failed to initialize cipso DOI.\n"); - doip->map.std = NULL; - 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 = netlbl_cfg_cipsov4_add(doip, &nai); - if (rc != 0) { - printk(KERN_WARNING "%s:%d cipso add rc = %d\n", - __func__, __LINE__, rc); - kfree(doip); - return; - } - rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); - if (rc != 0) { - printk(KERN_WARNING "%s:%d map add rc = %d\n", - __func__, __LINE__, rc); - kfree(doip); - return; - } -} - -/** - * smk_unlbl_ambient - initialize the unlabeled domain - * @oldambient: previous domain string - */ -static void smk_unlbl_ambient(char *oldambient) -{ - int rc; - struct netlbl_audit nai; - - smk_netlabel_audit_set(&nai); - - if (oldambient != NULL) { - rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); - if (rc != 0) - printk(KERN_WARNING "%s:%d remove rc = %d\n", - __func__, __LINE__, rc); - } - - rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET, - NULL, NULL, &nai); - if (rc != 0) - printk(KERN_WARNING "%s:%d add rc = %d\n", - __func__, __LINE__, rc); -} - -/* - * Seq_file read operations for /smack/cipso - */ - -static void *cipso_seq_start(struct seq_file *s, loff_t *pos) -{ - return smk_seq_start(s, pos, &smack_known_list); -} - -static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) -{ - return smk_seq_next(s, v, pos, &smack_known_list); -} - -/* - * Print cipso labels in format: - * label level[/cat[,cat]] - */ -static int cipso_seq_show(struct seq_file *s, void *v) -{ - struct list_head *list = v; - struct smack_known *skp = - list_entry(list, struct smack_known, list); - struct smack_cipso *scp = skp->smk_cipso; - char *cbp; - char sep = '/'; - int cat = 1; - int i; - unsigned char m; - - if (scp == NULL) - return 0; - - seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); - - cbp = scp->smk_catset; - for (i = 0; i < SMK_LABELLEN; i++) - for (m = 0x80; m != 0; m >>= 1) { - if (m & cbp[i]) { - seq_printf(s, "%c%d", sep, cat); - sep = ','; - } - cat++; - } - - seq_putc(s, '\n'); - - return 0; -} - -static const struct seq_operations cipso_seq_ops = { - .start = cipso_seq_start, - .next = cipso_seq_next, - .show = cipso_seq_show, - .stop = smk_seq_stop, -}; - -/** - * smk_open_cipso - open() for /smack/cipso - * @inode: inode structure representing file - * @file: "cipso" file pointer - * - * Connect our cipso_seq_* operations with /smack/cipso - * file_operations - */ -static int smk_open_cipso(struct inode *inode, struct file *file) -{ - return seq_open(file, &cipso_seq_ops); -} - -/** - * smk_write_cipso - write() for /smack/cipso - * @file: file pointer, not actually used - * @buf: where to get the data from - * @count: bytes sent - * @ppos: where to start - * - * Accepts only one cipso rule per write call. - * Returns number of bytes written or error code, as appropriate - */ -static ssize_t smk_write_cipso(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - struct smack_known *skp; - struct smack_cipso *scp = NULL; - char mapcatset[SMK_LABELLEN]; - int maplevel; - int cat; - int catlen; - ssize_t rc = -EINVAL; - char *data = NULL; - char *rule; - int ret; - int i; - - /* - * Must have privilege. - * No partial writes. - * Enough data must be present. - */ - if (!capable(CAP_MAC_ADMIN)) - return -EPERM; - if (*ppos != 0) - return -EINVAL; - if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) - return -EINVAL; - - data = kzalloc(count + 1, GFP_KERNEL); - if (data == NULL) - return -ENOMEM; - - if (copy_from_user(data, buf, count) != 0) { - rc = -EFAULT; - goto unlockedout; - } - - /* labels cannot begin with a '-' */ - if (data[0] == '-') { - rc = -EINVAL; - goto unlockedout; - } - data[count] = '\0'; - rule = data; - /* - * Only allow one writer at a time. Writes should be - * quite rare and small in any case. - */ - mutex_lock(&smack_cipso_lock); - - skp = smk_import_entry(rule, 0); - if (skp == NULL) - goto out; - - rule += SMK_LABELLEN; - ret = sscanf(rule, "%d", &maplevel); - if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) - goto out; - - rule += SMK_DIGITLEN; - ret = sscanf(rule, "%d", &catlen); - if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) - goto out; - - if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) - goto out; - - memset(mapcatset, 0, sizeof(mapcatset)); - - for (i = 0; i < catlen; i++) { - rule += SMK_DIGITLEN; - ret = sscanf(rule, "%d", &cat); - if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) - goto out; - - smack_catset_bit(cat, mapcatset); - } - - if (skp->smk_cipso == NULL) { - scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); - if (scp == NULL) { - rc = -ENOMEM; - goto out; - } - } - - spin_lock_bh(&skp->smk_cipsolock); - - if (scp == NULL) - scp = skp->smk_cipso; - else - skp->smk_cipso = scp; - - scp->smk_level = maplevel; - memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); - - spin_unlock_bh(&skp->smk_cipsolock); - - rc = count; -out: - mutex_unlock(&smack_cipso_lock); -unlockedout: - kfree(data); - return rc; -} - -static const struct file_operations smk_cipso_ops = { - .open = smk_open_cipso, - .read = seq_read, - .llseek = seq_lseek, - .write = smk_write_cipso, - .release = seq_release, -}; - -/* - * Seq_file read operations for /smack/netlabel - */ - -static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) -{ - return smk_seq_start(s, pos, &smk_netlbladdr_list); -} - -static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) -{ - return smk_seq_next(s, v, pos, &smk_netlbladdr_list); -} -#define BEBITS (sizeof(__be32) * 8) - -/* - * Print host/label pairs - */ -static int netlbladdr_seq_show(struct seq_file *s, void *v) -{ - struct list_head *list = v; - struct smk_netlbladdr *skp = - list_entry(list, struct smk_netlbladdr, list); - unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; - int maskn; - u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); - - for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); - - seq_printf(s, "%u.%u.%u.%u/%d %s\n", - hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); - - return 0; -} - -static const struct seq_operations netlbladdr_seq_ops = { - .start = netlbladdr_seq_start, - .next = netlbladdr_seq_next, - .show = netlbladdr_seq_show, - .stop = smk_seq_stop, -}; - -/** - * smk_open_netlbladdr - open() for /smack/netlabel - * @inode: inode structure representing file - * @file: "netlabel" file pointer - * - * Connect our netlbladdr_seq_* operations with /smack/netlabel - * file_operations - */ -static int smk_open_netlbladdr(struct inode *inode, struct file *file) -{ - return seq_open(file, &netlbladdr_seq_ops); -} - -/** - * smk_netlbladdr_insert - * @new : netlabel to insert - * - * This helper insert netlabel in the smack_netlbladdrs list - * sorted by netmask length (longest to smallest) - * locked by &smk_netlbladdr_lock in smk_write_netlbladdr - * - */ -static void smk_netlbladdr_insert(struct smk_netlbladdr *new) -{ - struct smk_netlbladdr *m, *m_next; - - if (list_empty(&smk_netlbladdr_list)) { - list_add_rcu(&new->list, &smk_netlbladdr_list); - return; - } - - m = list_entry_rcu(smk_netlbladdr_list.next, - struct smk_netlbladdr, list); - - /* the comparison '>' is a bit hacky, but works */ - if (new->smk_mask.s_addr > m->smk_mask.s_addr) { - list_add_rcu(&new->list, &smk_netlbladdr_list); - return; - } - - list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { - if (list_is_last(&m->list, &smk_netlbladdr_list)) { - list_add_rcu(&new->list, &m->list); - return; - } - m_next = list_entry_rcu(m->list.next, - struct smk_netlbladdr, list); - if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { - list_add_rcu(&new->list, &m->list); - return; - } - } -} - - -/** - * smk_write_netlbladdr - write() for /smack/netlabel - * @file: file pointer, not actually used - * @buf: where to get the data from - * @count: bytes sent - * @ppos: where to start - * - * Accepts only one netlbladdr per write call. - * Returns number of bytes written or error code, as appropriate - */ -static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - struct smk_netlbladdr *skp; - struct sockaddr_in newname; - char smack[SMK_LABELLEN]; - char *sp; - char data[SMK_NETLBLADDRMAX + 1]; - char *host = (char *)&newname.sin_addr.s_addr; - int rc; - struct netlbl_audit audit_info; - struct in_addr mask; - unsigned int m; - int found; - u32 mask_bits = (1<<31); - __be32 nsa; - u32 temp_mask; - - /* - * Must have privilege. - * No partial writes. - * Enough data must be present. - * "<addr/mask, as a.b.c.d/e><space><label>" - * "<addr, as a.b.c.d><space><label>" - */ - if (!capable(CAP_MAC_ADMIN)) - return -EPERM; - if (*ppos != 0) - return -EINVAL; - if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX) - return -EINVAL; - if (copy_from_user(data, buf, count) != 0) - return -EFAULT; - - data[count] = '\0'; - - rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", - &host[0], &host[1], &host[2], &host[3], &m, smack); - if (rc != 6) { - rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", - &host[0], &host[1], &host[2], &host[3], smack); - if (rc != 5) - return -EINVAL; - m = BEBITS; - } - if (m > BEBITS) - return -EINVAL; - - /* if smack begins with '-', its an option, don't import it */ - if (smack[0] != '-') { - sp = smk_import(smack, 0); - if (sp == NULL) - return -EINVAL; - } else { - /* check known options */ - if (strcmp(smack, smack_cipso_option) == 0) - sp = (char *)smack_cipso_option; - else - return -EINVAL; - } - - for (temp_mask = 0; m > 0; m--) { - temp_mask |= mask_bits; - mask_bits >>= 1; - } - mask.s_addr = cpu_to_be32(temp_mask); - - newname.sin_addr.s_addr &= mask.s_addr; - /* - * Only allow one writer at a time. Writes should be - * quite rare and small in any case. - */ - mutex_lock(&smk_netlbladdr_lock); - - nsa = newname.sin_addr.s_addr; - /* try to find if the prefix is already in the list */ - found = 0; - list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { - if (skp->smk_host.sin_addr.s_addr == nsa && - skp->smk_mask.s_addr == mask.s_addr) { - found = 1; - break; - } - } - smk_netlabel_audit_set(&audit_info); - - if (found == 0) { - skp = kzalloc(sizeof(*skp), GFP_KERNEL); - if (skp == NULL) - rc = -ENOMEM; - else { - rc = 0; - skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; - skp->smk_mask.s_addr = mask.s_addr; - skp->smk_label = sp; - smk_netlbladdr_insert(skp); - } - } else { - /* we delete the unlabeled entry, only if the previous label - * wasn't the special CIPSO option */ - if (skp->smk_label != smack_cipso_option) - rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, - &skp->smk_host.sin_addr, &skp->smk_mask, - PF_INET, &audit_info); - else - rc = 0; - skp->smk_label = sp; - } - - /* - * Now tell netlabel about the single label nature of - * this host so that incoming packets get labeled. - * but only if we didn't get the special CIPSO option - */ - if (rc == 0 && sp != smack_cipso_option) - rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, - &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, - smack_to_secid(skp->smk_label), &audit_info); - - if (rc == 0) - rc = count; - - mutex_unlock(&smk_netlbladdr_lock); - - return rc; -} - -static const struct file_operations smk_netlbladdr_ops = { - .open = smk_open_netlbladdr, - .read = seq_read, - .llseek = seq_lseek, - .write = smk_write_netlbladdr, - .release = seq_release, -}; - -/** - * smk_read_doi - read() for /smack/doi - * @filp: file pointer, not actually used - * @buf: where to put the result - * @count: maximum to send along - * @ppos: where to start - * - * Returns number of bytes read or error code, as appropriate - */ -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; -} - -/** - * smk_write_doi - write() for /smack/doi - * @file: file pointer, not actually used - * @buf: where to get the data from - * @count: bytes sent - * @ppos: where to start - * - * Returns number of bytes written or error code, as appropriate - */ -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_ADMIN)) - return -EPERM; - - if (count >= sizeof(temp) || count == 0) - return -EINVAL; - - if (copy_from_user(temp, buf, count) != 0) - return -EFAULT; - - temp[count] = '\0'; - - if (sscanf(temp, "%d", &i) != 1) - return -EINVAL; - - smk_cipso_doi_value = i; - - smk_cipso_doi(); - - return count; -} - -static const struct file_operations smk_doi_ops = { - .read = smk_read_doi, - .write = smk_write_doi, - .llseek = default_llseek, -}; - -/** - * smk_read_direct - read() for /smack/direct - * @filp: file pointer, not actually used - * @buf: where to put the result - * @count: maximum to send along - * @ppos: where to start - * - * Returns number of bytes read or error code, as appropriate - */ -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; -} - -/** - * smk_write_direct - write() for /smack/direct - * @file: file pointer, not actually used - * @buf: where to get the data from - * @count: bytes sent - * @ppos: where to start - * - * Returns number of bytes written or error code, as appropriate - */ -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_ADMIN)) - return -EPERM; - - if (count >= sizeof(temp) || count == 0) - return -EINVAL; - - if (copy_from_user(temp, buf, count) != 0) - return -EFAULT; - - temp[count] = '\0'; - - if (sscanf(temp, "%d", &i) != 1) - return -EINVAL; - - smack_cipso_direct = i; - - return count; -} - -static const struct file_operations smk_direct_ops = { - .read = smk_read_direct, - .write = smk_write_direct, - .llseek = default_llseek, -}; - -/** - * smk_read_ambient - read() for /smack/ambient - * @filp: file pointer, not actually used - * @buf: where to put the result - * @cn: maximum to send along - * @ppos: where to start - * - * Returns number of bytes read or error code, as appropriate - */ -static ssize_t smk_read_ambient(struct file *filp, char __user *buf, - size_t cn, loff_t *ppos) -{ - ssize_t rc; - int asize; - - if (*ppos != 0) - return 0; - /* - * Being careful to avoid a problem in the case where - * smack_net_ambient gets changed in midstream. - */ - mutex_lock(&smack_ambient_lock); - - asize = strlen(smack_net_ambient) + 1; - - if (cn >= asize) - rc = simple_read_from_buffer(buf, cn, ppos, - smack_net_ambient, asize); - else - rc = -EINVAL; - - mutex_unlock(&smack_ambient_lock); - - return rc; -} - -/** - * smk_write_ambient - write() for /smack/ambient - * @file: file pointer, not actually used - * @buf: where to get the data from - * @count: bytes sent - * @ppos: where to start - * - * Returns number of bytes written or error code, as appropriate - */ -static ssize_t smk_write_ambient(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - char in[SMK_LABELLEN]; - char *oldambient; - char *smack; - - if (!capable(CAP_MAC_ADMIN)) - return -EPERM; - - if (count >= SMK_LABELLEN) - return -EINVAL; - - if (copy_from_user(in, buf, count) != 0) - return -EFAULT; - - smack = smk_import(in, count); - if (smack == NULL) - return -EINVAL; - - mutex_lock(&smack_ambient_lock); - - oldambient = smack_net_ambient; - smack_net_ambient = smack; - smk_unlbl_ambient(oldambient); - - mutex_unlock(&smack_ambient_lock); - - return count; -} - -static const struct file_operations smk_ambient_ops = { - .read = smk_read_ambient, - .write = smk_write_ambient, - .llseek = default_llseek, -}; - -/** - * smk_read_onlycap - read() for /smack/onlycap - * @filp: file pointer, not actually used - * @buf: where to put the result - * @cn: maximum to send along - * @ppos: where to start - * - * Returns number of bytes read or error code, as appropriate - */ -static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, - size_t cn, loff_t *ppos) -{ - char *smack = ""; - ssize_t rc = -EINVAL; - int asize; - - if (*ppos != 0) - return 0; - - if (smack_onlycap != NULL) - smack = smack_onlycap; - - asize = strlen(smack) + 1; - - if (cn >= asize) - rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); - - return rc; -} - -/** - * smk_write_onlycap - write() for /smack/onlycap - * @file: file pointer, not actually used - * @buf: where to get the data from - * @count: bytes sent - * @ppos: where to start - * - * Returns number of bytes written or error code, as appropriate - */ -static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - char in[SMK_LABELLEN]; - char *sp = smk_of_task(current->cred->security); - - if (!capable(CAP_MAC_ADMIN)) - return -EPERM; - - /* - * This can be done using smk_access() but is done - * explicitly for clarity. The smk_access() implementation - * would use smk_access(smack_onlycap, MAY_WRITE) - */ - if (smack_onlycap != NULL && smack_onlycap != sp) - return -EPERM; - - if (count >= SMK_LABELLEN) - return -EINVAL; - - if (copy_from_user(in, buf, count) != 0) - return -EFAULT; - - /* - * Should the null string be passed in unset the onlycap value. - * This seems like something to be careful with as usually - * smk_import only expects to return NULL for errors. It - * is usually the case that a nullstring or "\n" would be - * bad to pass to smk_import but in fact this is useful here. - */ - smack_onlycap = smk_import(in, count); - - return count; -} - -static const struct file_operations smk_onlycap_ops = { - .read = smk_read_onlycap, - .write = smk_write_onlycap, - .llseek = default_llseek, -}; - -/** - * smk_read_logging - read() for /smack/logging - * @filp: file pointer, not actually used - * @buf: where to put the result - * @cn: maximum to send along - * @ppos: where to start - * - * Returns number of bytes read or error code, as appropriate - */ -static ssize_t smk_read_logging(struct file *filp, char __user *buf, - size_t count, loff_t *ppos) -{ - char temp[32]; - ssize_t rc; - - if (*ppos != 0) - return 0; - - sprintf(temp, "%d\n", log_policy); - rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); - return rc; -} - -/** - * smk_write_logging - write() for /smack/logging - * @file: file pointer, not actually used - * @buf: where to get the data from - * @count: bytes sent - * @ppos: where to start - * - * Returns number of bytes written or error code, as appropriate - */ -static ssize_t smk_write_logging(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - char temp[32]; - int i; - - if (!capable(CAP_MAC_ADMIN)) - return -EPERM; - - if (count >= sizeof(temp) || count == 0) - return -EINVAL; - - if (copy_from_user(temp, buf, count) != 0) - return -EFAULT; - - temp[count] = '\0'; - - if (sscanf(temp, "%d", &i) != 1) - return -EINVAL; - if (i < 0 || i > 3) - return -EINVAL; - log_policy = i; - return count; -} - - - -static const struct file_operations smk_logging_ops = { - .read = smk_read_logging, - .write = smk_write_logging, - .llseek = default_llseek, -}; - -/* - * Seq_file read operations for /smack/load-self - */ - -static void *load_self_seq_start(struct seq_file *s, loff_t *pos) -{ - struct task_smack *tsp = current_security(); - - return smk_seq_start(s, pos, &tsp->smk_rules); -} - -static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) -{ - struct task_smack *tsp = current_security(); - - return smk_seq_next(s, v, pos, &tsp->smk_rules); -} - -static int load_self_seq_show(struct seq_file *s, void *v) -{ - struct list_head *list = v; - struct smack_rule *srp = - list_entry(list, struct smack_rule, list); - - seq_printf(s, "%s %s", (char *)srp->smk_subject, - (char *)srp->smk_object); - - seq_putc(s, ' '); - - if (srp->smk_access & MAY_READ) - seq_putc(s, 'r'); - if (srp->smk_access & MAY_WRITE) - seq_putc(s, 'w'); - if (srp->smk_access & MAY_EXEC) - seq_putc(s, 'x'); - if (srp->smk_access & MAY_APPEND) - seq_putc(s, 'a'); - if (srp->smk_access & MAY_TRANSMUTE) - seq_putc(s, 't'); - if (srp->smk_access == 0) - seq_putc(s, '-'); - - seq_putc(s, '\n'); - - return 0; -} - -static const struct seq_operations load_self_seq_ops = { - .start = load_self_seq_start, - .next = load_self_seq_next, - .show = load_self_seq_show, - .stop = smk_seq_stop, -}; - - -/** - * smk_open_load_self - open() for /smack/load-self - * @inode: inode structure representing file - * @file: "load" file pointer - * - * For reading, use load_seq_* seq_file reading operations. - */ -static int smk_open_load_self(struct inode *inode, struct file *file) -{ - return seq_open(file, &load_self_seq_ops); -} - -/** - * smk_write_load_self - write() for /smack/load-self - * @file: file pointer, not actually used - * @buf: where to get the data from - * @count: bytes sent - * @ppos: where to start - must be 0 - * - */ -static ssize_t smk_write_load_self(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - struct task_smack *tsp = current_security(); - - return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules, - &tsp->smk_rules_lock); -} - -static const struct file_operations smk_load_self_ops = { - .open = smk_open_load_self, - .read = seq_read, - .llseek = seq_lseek, - .write = smk_write_load_self, - .release = seq_release, -}; - -/** - * smk_write_access - handle access check transaction - * @file: file pointer - * @buf: data from user space - * @count: bytes sent - * @ppos: where to start - must be 0 - */ -static ssize_t smk_write_access(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - struct smack_rule rule; - char *data; - int res; - - data = simple_transaction_get(file, buf, count); - if (IS_ERR(data)) - return PTR_ERR(data); - - if (count < SMK_LOADLEN || smk_parse_rule(data, &rule, 0)) - return -EINVAL; - - res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access, - NULL); - data[0] = res == 0 ? '1' : '0'; - data[1] = '\0'; - - simple_transaction_set(file, 2); - return SMK_LOADLEN; -} - -static const struct file_operations smk_access_ops = { - .write = smk_write_access, - .read = simple_transaction_read, - .release = simple_transaction_release, - .llseek = generic_file_llseek, -}; - -/** - * smk_fill_super - fill the /smackfs superblock - * @sb: the empty superblock - * @data: unused - * @silent: unused - * - * Fill in the well known entries for /smack - * - * Returns 0 on success, an error code on failure - */ -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_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_NETLBLADDR] = { - "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, - [SMK_ONLYCAP] = { - "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, - [SMK_LOGGING] = { - "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, - [SMK_LOAD_SELF] = { - "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, - [SMK_ACCESSES] = { - "access", &smk_access_ops, S_IRUGO|S_IWUGO}, - /* last one */ - {""} - }; - - rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); - if (rc != 0) { - printk(KERN_ERR "%s failed %d while creating inodes\n", - __func__, rc); - return rc; - } - - root_inode = sb->s_root->d_inode; - root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); - - return 0; -} - -/** - * smk_mount - get the smackfs superblock - * @fs_type: passed along without comment - * @flags: passed along without comment - * @dev_name: passed along without comment - * @data: passed along without comment - * - * Just passes everything along. - * - * Returns what the lower level code does. - */ -static struct dentry *smk_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_single(fs_type, flags, data, smk_fill_super); -} - -static struct file_system_type smk_fs_type = { - .name = "smackfs", - .mount = smk_mount, - .kill_sb = kill_litter_super, -}; - -static struct vfsmount *smackfs_mount; - -/** - * init_smk_fs - get the smackfs superblock - * - * register the smackfs - * - * Do not register smackfs if Smack wasn't enabled - * on boot. We can not put this method normally under the - * smack_init() code path since the security subsystem get - * initialized before the vfs caches. - * - * Returns true if we were not chosen on boot or if - * we were chosen and filesystem registration succeeded. - */ -static int __init init_smk_fs(void) -{ - int err; - - if (!security_module_enable(&smack_ops)) - return 0; - - 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; - } - } - - smk_cipso_doi(); - smk_unlbl_ambient(NULL); - - return err; -} - -__initcall(init_smk_fs); |