/* * 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/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 */ SMK_MAPPED = 13, /* CIPSO level indicating mapped label */ SMK_LOAD2 = 14, /* load policy with long labels */ SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */ SMK_ACCESS2 = 16, /* make an access check with long labels */ SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */ SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */ }; /* * 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; /* * 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; /* * This is the level in a CIPSO header that indicates a * secid is contained directly in the category set. * It can be reset via smackfs/mapped */ int smack_cipso_mapped = SMACK_CIPSO_MAPPED_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 and /smack/load2. */ 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) /* * Stricly for CIPSO level manipulation. * Set the category bit number in a smack label sized buffer. */ static inline void smack_catset_bit(unsigned int cat, char *catsetp) { if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) return; catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); } /** * 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()); } /* * Value for parsing single label host rules * "1.2.3.4 X" */ #define SMK_NETLBLADDRMIN 9 /** * 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_fill_rule - Fill Smack rule from strings * @subject: subject label string * @object: object label string * @access: access string * @rule: Smack rule * @import: if non-zero, import labels * @len: label length limit * * Returns 0 on success, -1 on failure */ static int smk_fill_rule(const char *subject, const char *object, const char *access, struct smack_rule *rule, int import, int len) { const char *cp; struct smack_known *skp; if (import) { rule->smk_subject = smk_import(subject, len); if (rule->smk_subject == NULL) return -1; rule->smk_object = smk_import(object, len); if (rule->smk_object == NULL) return -1; } else { cp = smk_parse_smack(subject, len); if (cp == NULL) return -1; skp = smk_find_entry(cp); kfree(cp); if (skp == NULL) return -1; rule->smk_subject = skp->smk_known; cp = smk_parse_smack(object, len); if (cp == NULL) return -1; skp = smk_find_entry(cp); kfree(cp); if (skp == NULL) return -1; rule->smk_object = skp->smk_known; } rule->smk_access = 0; for (cp = access; *cp != '\0'; cp++) { switch (*cp) { case '-': break; case 'r': case 'R': rule->smk_access |= MAY_READ; break; case 'w': case 'W': rule->smk_access |= MAY_WRITE; break; case 'x': case 'X': rule->smk_access |= MAY_EXEC; break; case 'a': case 'A': rule->smk_access |= MAY_APPEND; break; case 't': case 'T': rule->smk_access |= MAY_TRANSMUTE; break; default: return 0; } } return 0; } /** * 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 * * Returns 0 on success, -1 on errors. */ static int smk_parse_rule(const char *data, struct smack_rule *rule, int import) { int rc; rc = smk_fill_rule(data, data + SMK_LABELLEN, data + SMK_LABELLEN + SMK_LABELLEN, rule, import, SMK_LABELLEN); return rc; } /** * smk_parse_long_rule - parse Smack rule from rule string * @data: string to be parsed, null terminated * @rule: Smack rule * @import: if non-zero, import labels * * Returns 0 on success, -1 on failure */ static int smk_parse_long_rule(const char *data, struct smack_rule *rule, int import) { char *subject; char *object; char *access; int datalen; int rc = -1; /* This is inefficient */ datalen = strlen(data); /* Our first element can be 64 + \0 with no spaces */ subject = kzalloc(datalen + 1, GFP_KERNEL); if (subject == NULL) return -1; object = kzalloc(datalen, GFP_KERNEL); if (object == NULL) goto free_out_s; access = kzalloc(datalen, GFP_KERNEL); if (access == NULL) goto free_out_o; if (sscanf(data, "%s %s %s", subject, object, access) == 3) rc = smk_fill_rule(subject, object, access, rule, import, 0); kfree(access); free_out_o: kfree(object); free_out_s: kfree(subject); return rc; } #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ #define SMK_LONG_FMT 1 /* Variable long label format */ /** * smk_write_rules_list - write() for any /smack rule file * @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 * @format: /smack/load or /smack/load2 format. * * Get one smack access rule from above. * The format for SMK_LONG_FMT is: * "subject<whitespace>object<whitespace>access[<whitespace>...]" * The format for SMK_FIXED24_FMT is exactly: * "subject object rwxat" */ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, size_t count, loff_t *ppos, struct list_head *rule_list, struct mutex *rule_lock, int format) { struct smack_master_list *smlp; struct smack_known *skp; struct smack_rule *rule; char *data; int datalen; int rc = -EINVAL; int load = 0; /* * No partial writes. * Enough data must be present. */ if (*ppos != 0) return -EINVAL; if (format == SMK_FIXED24_FMT) { /* * Minor hack for backward compatibility */ if (count != SMK_OLOADLEN && count != SMK_LOADLEN) return -EINVAL; datalen = SMK_LOADLEN; } else datalen = count + 1; data = kzalloc(datalen, GFP_KERNEL); if (data == NULL) return -ENOMEM; if (copy_from_user(data, buf, count) != 0) { rc = -EFAULT; goto out; } rule = kzalloc(sizeof(*rule), GFP_KERNEL); if (rule == NULL) { rc = -ENOMEM; goto out; } if (format == SMK_LONG_FMT) { /* * Be sure the data string is terminated. */ data[count] = '\0'; if (smk_parse_long_rule(data, rule, 1)) goto out_free_rule; } else { /* * More on the minor hack for backward compatibility */ if (count == (SMK_OLOADLEN)) data[SMK_OLOADLEN] = '-'; 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 a global as opposed to 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 (!smk_set_access(rule, rule_list, rule_lock)) { if (load) { 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 */ } static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) { /* * Don't show any rules with label names too long for * interface file (/smack/load or /smack/load2) * because you should expect to be able to write * anything you read back. */ if (strlen(srp->smk_subject) >= max || strlen(srp->smk_object) >= max) return; if (srp->smk_access == 0) return; seq_printf(s, "%s %s", srp->smk_subject, 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'); seq_putc(s, '\n'); } /* * Seq_file read operations for /smack/load */ static void *load2_seq_start(struct seq_file *s, loff_t *pos) { return smk_seq_start(s, pos, &smack_rule_list); } static void *load2_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); smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); return 0; } static const struct seq_operations load_seq_ops = { .start = load2_seq_start, .next = load2_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 (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, SMK_FIXED24_FMT); } 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); } if (smack_net_ambient == NULL) smack_net_ambient = smack_known_floor.smk_known; 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 netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; char sep = '/'; int i; /* * Don't show a label that could not have been set using * /smack/cipso. This is in support of the notion that * anything read from /smack/cipso ought to be writeable * to /smack/cipso. * * /smack/cipso2 should be used instead. */ if (strlen(skp->smk_known) >= SMK_LABELLEN) return 0; seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; i = netlbl_secattr_catmap_walk(cmp, i + 1)) { seq_printf(s, "%c%d", sep, i); sep = ','; } 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_set_cipso - do the work for write() for cipso and cipso2 * @file: file pointer, not actually used * @buf: where to get the data from * @count: bytes sent * @ppos: where to start * @format: /smack/cipso or /smack/cipso2 * * Accepts only one cipso rule per write call. * Returns number of bytes written or error code, as appropriate */ static ssize_t smk_set_cipso(struct file *file, const char __user *buf, size_t count, loff_t *ppos, int format) { struct smack_known *skp; struct netlbl_lsm_secattr ncats; char mapcatset[SMK_CIPSOLEN]; int maplevel; unsigned 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 (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; if (*ppos != 0) return -EINVAL; if (format == SMK_FIXED24_FMT && (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; } 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; if (format == SMK_FIXED24_FMT) rule += SMK_LABELLEN; else rule += strlen(skp->smk_known); 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 (format == SMK_FIXED24_FMT && 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, "%u", &cat); if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) goto out; smack_catset_bit(cat, mapcatset); } rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); if (rc >= 0) { netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat); skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; rc = count; } out: mutex_unlock(&smack_cipso_lock); unlockedout: kfree(data); return rc; } /** * 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) { return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); } 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/cipso2 */ /* * Print cipso labels in format: * label level[/cat[,cat]] */ static int cipso2_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 netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; char sep = '/'; int i; seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; i = netlbl_secattr_catmap_walk(cmp, i + 1)) { seq_printf(s, "%c%d", sep, i); sep = ','; } seq_putc(s, '\n'); return 0; } static const struct seq_operations cipso2_seq_ops = { .start = cipso_seq_start, .next = cipso_seq_next, .show = cipso2_seq_show, .stop = smk_seq_stop, }; /** * smk_open_cipso2 - open() for /smack/cipso2 * @inode: inode structure representing file * @file: "cipso2" file pointer * * Connect our cipso_seq_* operations with /smack/cipso2 * file_operations */ static int smk_open_cipso2(struct inode *inode, struct file *file) { return seq_open(file, &cipso2_seq_ops); } /** * smk_write_cipso2 - write() for /smack/cipso2 * @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_cipso2(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); } static const struct file_operations smk_cipso2_ops = { .open = smk_open_cipso2, .read = seq_read, .llseek = seq_lseek, .write = smk_write_cipso2, .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; char *sp; char *data; 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 (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; if (*ppos != 0) return -EINVAL; if (count < SMK_NETLBLADDRMIN) return -EINVAL; data = kzalloc(count + 1, GFP_KERNEL); if (data == NULL) return -ENOMEM; if (copy_from_user(data, buf, count) != 0) { rc = -EFAULT; goto free_data_out; } smack = kzalloc(count + 1, GFP_KERNEL); if (smack == NULL) { rc = -ENOMEM; goto free_data_out; } 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) { rc = -EINVAL; goto free_out; } m = BEBITS; } if (m > BEBITS) { rc = -EINVAL; goto free_out; } /* * If smack begins with '-', it is an option, don't import it */ if (smack[0] != '-') { sp = smk_import(smack, 0); if (sp == NULL) { rc = -EINVAL; goto free_out; } } else { /* check known options */ if (strcmp(smack, smack_cipso_option) == 0) sp = (char *)smack_cipso_option; else { rc = -EINVAL; goto free_out; } } 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); free_out: kfree(smack); free_data_out: kfree(data); 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 (!smack_privileged(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) { struct smack_known *skp; char temp[80]; int i; if (!smack_privileged(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; /* * Don't do anything if the value hasn't actually changed. * If it is changing reset the level on entries that were * set up to be direct when they were created. */ if (smack_cipso_direct != i) { mutex_lock(&smack_known_lock); list_for_each_entry_rcu(skp, &smack_known_list, list) if (skp->smk_netlabel.attr.mls.lvl == smack_cipso_direct) skp->smk_netlabel.attr.mls.lvl = i; smack_cipso_direct = i; mutex_unlock(&smack_known_lock); } return count; } static const struct file_operations smk_direct_ops = { .read = smk_read_direct, .write = smk_write_direct, .llseek = default_llseek, }; /** * smk_read_mapped - read() for /smack/mapped * @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_mapped(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_mapped); rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); return rc; } /** * smk_write_mapped - write() for /smack/mapped * @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_mapped(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct smack_known *skp; char temp[80]; int i; if (!smack_privileged(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; /* * Don't do anything if the value hasn't actually changed. * If it is changing reset the level on entries that were * set up to be mapped when they were created. */ if (smack_cipso_mapped != i) { mutex_lock(&smack_known_lock); list_for_each_entry_rcu(skp, &smack_known_list, list) if (skp->smk_netlabel.attr.mls.lvl == smack_cipso_mapped) skp->smk_netlabel.attr.mls.lvl = i; smack_cipso_mapped = i; mutex_unlock(&smack_known_lock); } return count; } static const struct file_operations smk_mapped_ops = { .read = smk_read_mapped, .write = smk_write_mapped, .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 *oldambient; char *smack = NULL; char *data; int rc = count; if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; data = kzalloc(count + 1, GFP_KERNEL); if (data == NULL) return -ENOMEM; if (copy_from_user(data, buf, count) != 0) { rc = -EFAULT; goto out; } smack = smk_import(data, count); if (smack == NULL) { rc = -EINVAL; goto out; } mutex_lock(&smack_ambient_lock); oldambient = smack_net_ambient; smack_net_ambient = smack; smk_unlbl_ambient(oldambient); mutex_unlock(&smack_ambient_lock); out: kfree(data); return rc; } 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 *data; char *sp = smk_of_task(current->cred->security); int rc = count; if (!smack_privileged(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; data = kzalloc(count, GFP_KERNEL); if (data == NULL) return -ENOMEM; /* * 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. * * smk_import will also reject a label beginning with '-', * so "-usecapabilities" will also work. */ if (copy_from_user(data, buf, count) != 0) rc = -EFAULT; else smack_onlycap = smk_import(data, count); kfree(data); return rc; } 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 (!smack_privileged(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); smk_rule_show(s, srp, SMK_LABELLEN); 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-self2 * @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_rules_list(file, buf, count, ppos, &tsp->smk_rules, &tsp->smk_rules_lock, SMK_FIXED24_FMT); } 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_user_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_user_access(struct file *file, const char __user *buf, size_t count, loff_t *ppos, int format) { struct smack_rule rule; char *data; char *cod; int res; data = simple_transaction_get(file, buf, count); if (IS_ERR(data)) return PTR_ERR(data); if (format == SMK_FIXED24_FMT) { if (count < SMK_LOADLEN) return -EINVAL; res = smk_parse_rule(data, &rule, 0); } else { /* * Copy the data to make sure the string is terminated. */ cod = kzalloc(count + 1, GFP_KERNEL); if (cod == NULL) return -ENOMEM; memcpy(cod, data, count); cod[count] = '\0'; res = smk_parse_long_rule(cod, &rule, 0); kfree(cod); } if (res) 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); if (format == SMK_FIXED24_FMT) return SMK_LOADLEN; return count; } /** * 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) { return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); } static const struct file_operations smk_access_ops = { .write = smk_write_access, .read = simple_transaction_read, .release = simple_transaction_release, .llseek = generic_file_llseek, }; /* * Seq_file read operations for /smack/load2 */ static int load2_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); smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); return 0; } static const struct seq_operations load2_seq_ops = { .start = load2_seq_start, .next = load2_seq_next, .show = load2_seq_show, .stop = smk_seq_stop, }; /** * smk_open_load2 - open() for /smack/load2 * @inode: inode structure representing file * @file: "load2" file pointer * * For reading, use load2_seq_* seq_file reading operations. */ static int smk_open_load2(struct inode *inode, struct file *file) { return seq_open(file, &load2_seq_ops); } /** * smk_write_load2 - write() for /smack/load2 * @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_load2(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { /* * Must have privilege. */ if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, SMK_LONG_FMT); } static const struct file_operations smk_load2_ops = { .open = smk_open_load2, .read = seq_read, .llseek = seq_lseek, .write = smk_write_load2, .release = seq_release, }; /* * Seq_file read operations for /smack/load-self2 */ static void *load_self2_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_self2_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_self2_seq_show(struct seq_file *s, void *v) { struct list_head *list = v; struct smack_rule *srp = list_entry(list, struct smack_rule, list); smk_rule_show(s, srp, SMK_LONGLABEL); return 0; } static const struct seq_operations load_self2_seq_ops = { .start = load_self2_seq_start, .next = load_self2_seq_next, .show = load_self2_seq_show, .stop = smk_seq_stop, }; /** * smk_open_load_self2 - open() for /smack/load-self2 * @inode: inode structure representing file * @file: "load" file pointer * * For reading, use load_seq_* seq_file reading operations. */ static int smk_open_load_self2(struct inode *inode, struct file *file) { return seq_open(file, &load_self2_seq_ops); } /** * smk_write_load_self2 - write() for /smack/load-self2 * @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_self2(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct task_smack *tsp = current_security(); return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, &tsp->smk_rules_lock, SMK_LONG_FMT); } static const struct file_operations smk_load_self2_ops = { .open = smk_open_load_self2, .read = seq_read, .llseek = seq_lseek, .write = smk_write_load_self2, .release = seq_release, }; /** * smk_write_access2 - 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_access2(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); } static const struct file_operations smk_access2_ops = { .write = smk_write_access2, .read = simple_transaction_read, .release = simple_transaction_release, .llseek = generic_file_llseek, }; /** * smk_write_revoke_subj - write() for /smack/revoke-subject * @file: file pointer * @buf: data from user space * @count: bytes sent * @ppos: where to start - must be 0 */ static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char *data = NULL; const char *cp = NULL; struct smack_known *skp; struct smack_rule *sp; struct list_head *rule_list; struct mutex *rule_lock; int rc = count; if (*ppos != 0) return -EINVAL; if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; if (count == 0 || count > SMK_LONGLABEL) return -EINVAL; data = kzalloc(count, GFP_KERNEL); if (data == NULL) return -ENOMEM; if (copy_from_user(data, buf, count) != 0) { rc = -EFAULT; goto free_out; } cp = smk_parse_smack(data, count); if (cp == NULL) { rc = -EINVAL; goto free_out; } skp = smk_find_entry(cp); if (skp == NULL) { rc = -EINVAL; goto free_out; } rule_list = &skp->smk_rules; rule_lock = &skp->smk_rules_lock; mutex_lock(rule_lock); list_for_each_entry_rcu(sp, rule_list, list) sp->smk_access = 0; mutex_unlock(rule_lock); free_out: kfree(data); kfree(cp); return rc; } static const struct file_operations smk_revoke_subj_ops = { .write = smk_write_revoke_subj, .read = simple_transaction_read, .release = simple_transaction_release, .llseek = generic_file_llseek, }; static struct kset *smackfs_kset; /** * smk_init_sysfs - initialize /sys/fs/smackfs * */ static int smk_init_sysfs(void) { smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj); if (!smackfs_kset) return -ENOMEM; return 0; } /** * 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}, [SMK_MAPPED] = { "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, [SMK_LOAD2] = { "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, [SMK_LOAD_SELF2] = { "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, [SMK_ACCESS2] = { "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, [SMK_CIPSO2] = { "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, [SMK_REVOKE_SUBJ] = { "revoke-subject", &smk_revoke_subj_ops, S_IRUGO|S_IWUSR}, /* 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; 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; static int __init smk_preset_netlabel(struct smack_known *skp) { skp->smk_netlabel.domain = skp->smk_known; skp->smk_netlabel.flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, &skp->smk_netlabel, strlen(skp->smk_known)); } /** * 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; int rc; if (!security_module_enable(&smack_ops)) return 0; err = smk_init_sysfs(); if (err) printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); 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); rc = smk_preset_netlabel(&smack_known_floor); if (err == 0 && rc < 0) err = rc; rc = smk_preset_netlabel(&smack_known_hat); if (err == 0 && rc < 0) err = rc; rc = smk_preset_netlabel(&smack_known_huh); if (err == 0 && rc < 0) err = rc; rc = smk_preset_netlabel(&smack_known_invalid); if (err == 0 && rc < 0) err = rc; rc = smk_preset_netlabel(&smack_known_star); if (err == 0 && rc < 0) err = rc; rc = smk_preset_netlabel(&smack_known_web); if (err == 0 && rc < 0) err = rc; return err; } __initcall(init_smk_fs);