| /* |
| * 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 <linux/magic.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 '-' */ |
| SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */ |
| SMK_SYSLOG = 20, /* change syslog label) */ |
| SMK_PTRACE = 21, /* set ptrace rule */ |
| #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
| SMK_UNCONFINED = 22, /* define an unconfined label */ |
| #endif |
| }; |
| |
| /* |
| * List locks |
| */ |
| 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 |
| */ |
| struct smack_known *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; |
| |
| #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
| /* |
| * Allow one label to be unconfined. This is for |
| * debugging and application bring-up purposes only. |
| * It is bad and wrong, but everyone seems to expect |
| * to have it. |
| */ |
| struct smack_known *smack_unconfined; |
| #endif |
| |
| /* |
| * If this value is set restrict syslog use to the label specified. |
| * It can be reset via smackfs/syslog |
| */ |
| struct smack_known *smack_syslog_label; |
| |
| /* |
| * Ptrace current rule |
| * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based) |
| * SMACK_PTRACE_EXACT labels must match, but can be overriden with |
| * CAP_SYS_PTRACE |
| * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect |
| */ |
| int smack_ptrace_rule = SMACK_PTRACE_DEFAULT; |
| |
| /* |
| * 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); |
| |
| struct smack_parsed_rule { |
| struct smack_known *smk_subject; |
| struct smack_known *smk_object; |
| int smk_access1; |
| int smk_access2; |
| }; |
| |
| static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
| |
| struct smack_known smack_cipso_option = { |
| .smk_known = SMACK_CIPSO_OPTION, |
| .smk_secid = 0, |
| }; |
| |
| /* |
| * 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 "rwxatl" |
| #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) |
| { |
| struct smack_known *skp = smk_of_current(); |
| |
| nap->loginuid = audit_get_loginuid(current); |
| nap->sessionid = audit_get_sessionid(current); |
| nap->secid = skp->smk_secid; |
| } |
| |
| /* |
| * 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 or replace an old rule |
| * @srp: the rule to add or replace |
| * @rule_list: the list of rules |
| * @rule_lock: the rule list lock |
| * @global: if non-zero, indicates a global rule |
| * |
| * 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 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_parsed_rule *srp, |
| struct list_head *rule_list, |
| struct mutex *rule_lock, int global) |
| { |
| struct smack_rule *sp; |
| struct smack_master_list *smlp; |
| int found = 0; |
| int rc = 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_access1; |
| sp->smk_access &= ~srp->smk_access2; |
| break; |
| } |
| } |
| |
| if (found == 0) { |
| sp = kzalloc(sizeof(*sp), GFP_KERNEL); |
| if (sp == NULL) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| sp->smk_subject = srp->smk_subject; |
| sp->smk_object = srp->smk_object; |
| sp->smk_access = srp->smk_access1 & ~srp->smk_access2; |
| |
| list_add_rcu(&sp->list, rule_list); |
| /* |
| * If this is a global as opposed to self and a new rule |
| * it needs to get added for reporting. |
| */ |
| if (global) { |
| smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); |
| if (smlp != NULL) { |
| smlp->smk_rule = sp; |
| list_add_rcu(&smlp->list, &smack_rule_list); |
| } else |
| rc = -ENOMEM; |
| } |
| } |
| |
| out: |
| mutex_unlock(rule_lock); |
| return rc; |
| } |
| |
| /** |
| * smk_perm_from_str - parse smack accesses from a text string |
| * @string: a text string that contains a Smack accesses code |
| * |
| * Returns an integer with respective bits set for specified accesses. |
| */ |
| static int smk_perm_from_str(const char *string) |
| { |
| int perm = 0; |
| const char *cp; |
| |
| for (cp = string; ; cp++) |
| switch (*cp) { |
| case '-': |
| break; |
| case 'r': |
| case 'R': |
| perm |= MAY_READ; |
| break; |
| case 'w': |
| case 'W': |
| perm |= MAY_WRITE; |
| break; |
| case 'x': |
| case 'X': |
| perm |= MAY_EXEC; |
| break; |
| case 'a': |
| case 'A': |
| perm |= MAY_APPEND; |
| break; |
| case 't': |
| case 'T': |
| perm |= MAY_TRANSMUTE; |
| break; |
| case 'l': |
| case 'L': |
| perm |= MAY_LOCK; |
| break; |
| case 'b': |
| case 'B': |
| perm |= MAY_BRINGUP; |
| break; |
| default: |
| return perm; |
| } |
| } |
| |
| /** |
| * smk_fill_rule - Fill Smack rule from strings |
| * @subject: subject label string |
| * @object: object label string |
| * @access1: access string |
| * @access2: string with permissions to be removed |
| * @rule: Smack rule |
| * @import: if non-zero, import labels |
| * @len: label length limit |
| * |
| * Returns 0 on success, appropriate error code on failure. |
| */ |
| static int smk_fill_rule(const char *subject, const char *object, |
| const char *access1, const char *access2, |
| struct smack_parsed_rule *rule, int import, |
| int len) |
| { |
| const char *cp; |
| struct smack_known *skp; |
| |
| if (import) { |
| rule->smk_subject = smk_import_entry(subject, len); |
| if (IS_ERR(rule->smk_subject)) |
| return PTR_ERR(rule->smk_subject); |
| |
| rule->smk_object = smk_import_entry(object, len); |
| if (IS_ERR(rule->smk_object)) |
| return PTR_ERR(rule->smk_object); |
| } else { |
| cp = smk_parse_smack(subject, len); |
| if (IS_ERR(cp)) |
| return PTR_ERR(cp); |
| skp = smk_find_entry(cp); |
| kfree(cp); |
| if (skp == NULL) |
| return -ENOENT; |
| rule->smk_subject = skp; |
| |
| cp = smk_parse_smack(object, len); |
| if (IS_ERR(cp)) |
| return PTR_ERR(cp); |
| skp = smk_find_entry(cp); |
| kfree(cp); |
| if (skp == NULL) |
| return -ENOENT; |
| rule->smk_object = skp; |
| } |
| |
| rule->smk_access1 = smk_perm_from_str(access1); |
| if (access2) |
| rule->smk_access2 = smk_perm_from_str(access2); |
| else |
| rule->smk_access2 = ~rule->smk_access1; |
| |
| 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_parsed_rule *rule, |
| int import) |
| { |
| int rc; |
| |
| rc = smk_fill_rule(data, data + SMK_LABELLEN, |
| data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
| import, SMK_LABELLEN); |
| return rc; |
| } |
| |
| /** |
| * smk_parse_long_rule - parse Smack rule from rule string |
| * @data: string to be parsed, null terminated |
| * @rule: Will be filled with Smack parsed rule |
| * @import: if non-zero, import labels |
| * @tokens: numer of substrings expected in data |
| * |
| * Returns number of processed bytes on success, -ERRNO on failure. |
| */ |
| static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, |
| int import, int tokens) |
| { |
| ssize_t cnt = 0; |
| char *tok[4]; |
| int rc; |
| int i; |
| |
| /* |
| * Parsing the rule in-place, filling all white-spaces with '\0' |
| */ |
| for (i = 0; i < tokens; ++i) { |
| while (isspace(data[cnt])) |
| data[cnt++] = '\0'; |
| |
| if (data[cnt] == '\0') |
| /* Unexpected end of data */ |
| return -EINVAL; |
| |
| tok[i] = data + cnt; |
| |
| while (data[cnt] && !isspace(data[cnt])) |
| ++cnt; |
| } |
| while (isspace(data[cnt])) |
| data[cnt++] = '\0'; |
| |
| while (i < 4) |
| tok[i++] = NULL; |
| |
| rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0); |
| return rc == 0 ? cnt : rc; |
| } |
| |
| #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
| #define SMK_LONG_FMT 1 /* Variable long label format */ |
| #define SMK_CHANGE_FMT 2 /* Rule modification 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 or /smack/change-rule 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" |
| * The format for SMK_CHANGE_FMT is: |
| * "subject<whitespace>object<whitespace> |
| * acc_enable<whitespace>acc_disable[<whitespace>...]" |
| */ |
| 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_parsed_rule rule; |
| char *data; |
| int rc; |
| int trunc = 0; |
| int tokens; |
| ssize_t cnt = 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; |
| } else { |
| if (count >= PAGE_SIZE) { |
| count = PAGE_SIZE - 1; |
| trunc = 1; |
| } |
| } |
| |
| data = kmalloc(count + 1, GFP_KERNEL); |
| if (data == NULL) |
| return -ENOMEM; |
| |
| if (copy_from_user(data, buf, count) != 0) { |
| rc = -EFAULT; |
| goto out; |
| } |
| |
| /* |
| * In case of parsing only part of user buf, |
| * avoid having partial rule at the data buffer |
| */ |
| if (trunc) { |
| while (count > 0 && (data[count - 1] != '\n')) |
| --count; |
| if (count == 0) { |
| rc = -EINVAL; |
| goto out; |
| } |
| } |
| |
| data[count] = '\0'; |
| tokens = (format == SMK_CHANGE_FMT ? 4 : 3); |
| while (cnt < count) { |
| if (format == SMK_FIXED24_FMT) { |
| rc = smk_parse_rule(data, &rule, 1); |
| if (rc < 0) |
| goto out; |
| cnt = count; |
| } else { |
| rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); |
| if (rc < 0) |
| goto out; |
| if (rc == 0) { |
| rc = -EINVAL; |
| goto out; |
| } |
| cnt += rc; |
| } |
| |
| if (rule_list == NULL) |
| rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, |
| &rule.smk_subject->smk_rules_lock, 1); |
| else |
| rc = smk_set_access(&rule, rule_list, rule_lock, 0); |
| |
| if (rc) |
| goto out; |
| } |
| |
| rc = cnt; |
| 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; |
| int i = *pos; |
| |
| rcu_read_lock(); |
| for (list = rcu_dereference(list_next_rcu(head)); |
| list != head; |
| list = rcu_dereference(list_next_rcu(list))) { |
| if (i-- == 0) |
| return list; |
| } |
| |
| return NULL; |
| } |
| |
| static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
| struct list_head *head) |
| { |
| struct list_head *list = v; |
| |
| ++*pos; |
| list = rcu_dereference(list_next_rcu(list)); |
| |
| return (list == head) ? NULL : list; |
| } |
| |
| static void smk_seq_stop(struct seq_file *s, void *v) |
| { |
| rcu_read_unlock(); |
| } |
| |
| 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->smk_known) >= max || |
| strlen(srp->smk_object->smk_known) >= max) |
| return; |
| |
| if (srp->smk_access == 0) |
| return; |
| |
| seq_printf(s, "%s %s", |
| srp->smk_subject->smk_known, |
| srp->smk_object->smk_known); |
| |
| 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 & MAY_LOCK) |
| seq_putc(s, 'l'); |
| if (srp->smk_access & MAY_BRINGUP) |
| seq_putc(s, 'b'); |
| |
| 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_rcu(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; |
| |
| rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, 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_rcu(list, struct smack_known, list); |
| struct netlbl_lsm_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_catmap_walk(cmp, 0); i >= 0; |
| i = netlbl_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 (IS_ERR(skp)) { |
| rc = PTR_ERR(skp); |
| goto out; |
| } |
| |
| if (format == SMK_FIXED24_FMT) |
| rule += SMK_LABELLEN; |
| else |
| rule += strlen(skp->smk_known) + 1; |
| |
| 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_MAXCATNUM) |
| goto out; |
| |
| smack_catset_bit(cat, mapcatset); |
| } |
| |
| rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
| if (rc >= 0) { |
| netlbl_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_rcu(list, struct smack_known, list); |
| struct netlbl_lsm_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_catmap_walk(cmp, 0); i >= 0; |
| i = netlbl_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_rcu(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->smk_known); |
| |
| 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 *snp; |
| struct sockaddr_in newname; |
| char *smack; |
| struct smack_known *skp; |
| 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/%u %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] != '-') { |
| skp = smk_import_entry(smack, 0); |
| if (IS_ERR(skp)) { |
| rc = PTR_ERR(skp); |
| goto free_out; |
| } |
| } else { |
| /* check known options */ |
| if (strcmp(smack, smack_cipso_option.smk_known) == 0) |
| skp = &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(snp, &smk_netlbladdr_list, list) { |
| if (snp->smk_host.sin_addr.s_addr == nsa && |
| snp->smk_mask.s_addr == mask.s_addr) { |
| found = 1; |
| break; |
| } |
| } |
| smk_netlabel_audit_set(&audit_info); |
| |
| if (found == 0) { |
| snp = kzalloc(sizeof(*snp), GFP_KERNEL); |
| if (snp == NULL) |
| rc = -ENOMEM; |
| else { |
| rc = 0; |
| snp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; |
| snp->smk_mask.s_addr = mask.s_addr; |
| snp->smk_label = skp; |
| smk_netlbladdr_insert(snp); |
| } |
| } else { |
| /* we delete the unlabeled entry, only if the previous label |
| * wasn't the special CIPSO option */ |
| if (snp->smk_label != &smack_cipso_option) |
| rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
| &snp->smk_host.sin_addr, &snp->smk_mask, |
| PF_INET, &audit_info); |
| else |
| rc = 0; |
| snp->smk_label = skp; |
| } |
| |
| /* |
| * 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 && skp != &smack_cipso_option) |
| rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
| &snp->smk_host.sin_addr, &snp->smk_mask, PF_INET, |
| snp->smk_label->smk_secid, &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->smk_known) + 1; |
| |
| if (cn >= asize) |
| rc = simple_read_from_buffer(buf, cn, ppos, |
| smack_net_ambient->smk_known, |
| 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) |
| { |
| struct smack_known *skp; |
| char *oldambient; |
| 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; |
| } |
| |
| skp = smk_import_entry(data, count); |
| if (IS_ERR(skp)) { |
| rc = PTR_ERR(skp); |
| goto out; |
| } |
| |
| mutex_lock(&smack_ambient_lock); |
| |
| oldambient = smack_net_ambient->smk_known; |
| smack_net_ambient = skp; |
| 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, |
| }; |
| |
| /* |
| * Seq_file operations for /smack/onlycap |
| */ |
| static void *onlycap_seq_start(struct seq_file *s, loff_t *pos) |
| { |
| return smk_seq_start(s, pos, &smack_onlycap_list); |
| } |
| |
| static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| { |
| return smk_seq_next(s, v, pos, &smack_onlycap_list); |
| } |
| |
| static int onlycap_seq_show(struct seq_file *s, void *v) |
| { |
| struct list_head *list = v; |
| struct smack_onlycap *sop = |
| list_entry_rcu(list, struct smack_onlycap, list); |
| |
| seq_puts(s, sop->smk_label->smk_known); |
| seq_putc(s, ' '); |
| |
| return 0; |
| } |
| |
| static const struct seq_operations onlycap_seq_ops = { |
| .start = onlycap_seq_start, |
| .next = onlycap_seq_next, |
| .show = onlycap_seq_show, |
| .stop = smk_seq_stop, |
| }; |
| |
| static int smk_open_onlycap(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &onlycap_seq_ops); |
| } |
| |
| /** |
| * smk_list_swap_rcu - swap public list with a private one in RCU-safe way |
| * The caller must hold appropriate mutex to prevent concurrent modifications |
| * to the public list. |
| * Private list is assumed to be not accessible to other threads yet. |
| * |
| * @public: public list |
| * @private: private list |
| */ |
| static void smk_list_swap_rcu(struct list_head *public, |
| struct list_head *private) |
| { |
| struct list_head *first, *last; |
| |
| if (list_empty(public)) { |
| list_splice_init_rcu(private, public, synchronize_rcu); |
| } else { |
| /* Remember public list before replacing it */ |
| first = public->next; |
| last = public->prev; |
| |
| /* Publish private list in place of public in RCU-safe way */ |
| private->prev->next = public; |
| private->next->prev = public; |
| rcu_assign_pointer(public->next, private->next); |
| public->prev = private->prev; |
| |
| synchronize_rcu(); |
| |
| /* When all readers are done with the old public list, |
| * attach it in place of private */ |
| private->next = first; |
| private->prev = last; |
| first->prev = private; |
| last->next = private; |
| } |
| } |
| |
| /** |
| * smk_write_onlycap - write() for smackfs/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 *data_parse; |
| char *tok; |
| struct smack_known *skp; |
| struct smack_onlycap *sop; |
| struct smack_onlycap *sop2; |
| LIST_HEAD(list_tmp); |
| 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) { |
| kfree(data); |
| return -EFAULT; |
| } |
| |
| data_parse = data; |
| while ((tok = strsep(&data_parse, " ")) != NULL) { |
| if (!*tok) |
| continue; |
| |
| skp = smk_import_entry(tok, 0); |
| if (IS_ERR(skp)) { |
| rc = PTR_ERR(skp); |
| break; |
| } |
| |
| sop = kzalloc(sizeof(*sop), GFP_KERNEL); |
| if (sop == NULL) { |
| rc = -ENOMEM; |
| break; |
| } |
| |
| sop->smk_label = skp; |
| list_add_rcu(&sop->list, &list_tmp); |
| } |
| kfree(data); |
| |
| /* |
| * Clear the smack_onlycap on invalid label errors. This means |
| * that we can pass a null string to unset the onlycap value. |
| * |
| * Importing will also reject a label beginning with '-', |
| * so "-usecapabilities" will also work. |
| * |
| * But do so only on invalid label, not on system errors. |
| * The invalid label must be first to count as clearing attempt. |
| */ |
| if (rc == -EINVAL && list_empty(&list_tmp)) |
| rc = count; |
| |
| if (rc >= 0) { |
| mutex_lock(&smack_onlycap_lock); |
| smk_list_swap_rcu(&smack_onlycap_list, &list_tmp); |
| mutex_unlock(&smack_onlycap_lock); |
| } |
| |
| list_for_each_entry_safe(sop, sop2, &list_tmp, list) |
| kfree(sop); |
| |
| return rc; |
| } |
| |
| static const struct file_operations smk_onlycap_ops = { |
| .open = smk_open_onlycap, |
| .read = seq_read, |
| .write = smk_write_onlycap, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| |
| #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
| /** |
| * smk_read_unconfined - read() for smackfs/unconfined |
| * @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_unconfined(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_unconfined != NULL) |
| smack = smack_unconfined->smk_known; |
| |
| asize = strlen(smack) + 1; |
| |
| if (cn >= asize) |
| rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); |
| |
| return rc; |
| } |
| |
| /** |
| * smk_write_unconfined - write() for smackfs/unconfined |
| * @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_unconfined(struct file *file, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| char *data; |
| struct smack_known *skp; |
| 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 freeout; |
| } |
| |
| /* |
| * Clear the smack_unconfined on invalid label errors. This means |
| * that we can pass a null string to unset the unconfined value. |
| * |
| * Importing will also reject a label beginning with '-', |
| * so "-confine" will also work. |
| * |
| * But do so only on invalid label, not on system errors. |
| */ |
| skp = smk_import_entry(data, count); |
| if (PTR_ERR(skp) == -EINVAL) |
| skp = NULL; |
| else if (IS_ERR(skp)) { |
| rc = PTR_ERR(skp); |
| goto freeout; |
| } |
| |
| smack_unconfined = skp; |
| |
| freeout: |
| kfree(data); |
| return rc; |
| } |
| |
| static const struct file_operations smk_unconfined_ops = { |
| .read = smk_read_unconfined, |
| .write = smk_write_unconfined, |
| .llseek = default_llseek, |
| }; |
| #endif /* CONFIG_SECURITY_SMACK_BRINGUP */ |
| |
| /** |
| * 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_rcu(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_parsed_rule rule; |
| char *data; |
| 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 { |
| /* |
| * simple_transaction_get() returns null-terminated data |
| */ |
| res = smk_parse_long_rule(data, &rule, 0, 3); |
| } |
| |
| if (res >= 0) |
| res = smk_access(rule.smk_subject, rule.smk_object, |
| rule.smk_access1, NULL); |
| else if (res != -ENOENT) |
| return res; |
| |
| /* |
| * smk_access() can return a value > 0 in the "bringup" case. |
| */ |
| 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_rcu(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_rcu(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; |
| const char *cp; |
| 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 out_data; |
| } |
| |
| cp = smk_parse_smack(data, count); |
| if (IS_ERR(cp)) { |
| rc = PTR_ERR(cp); |
| goto out_data; |
| } |
| |
| skp = smk_find_entry(cp); |
| if (skp == NULL) |
| goto out_cp; |
| |
| 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); |
| |
| out_cp: |
| kfree(cp); |
| out_data: |
| kfree(data); |
| |
| 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_write_change_rule - write() for /smack/change-rule |
| * @file: file pointer |
| * @buf: data from user space |
| * @count: bytes sent |
| * @ppos: where to start - must be 0 |
| */ |
| static ssize_t smk_write_change_rule(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_CHANGE_FMT); |
| } |
| |
| static const struct file_operations smk_change_rule_ops = { |
| .write = smk_write_change_rule, |
| .read = simple_transaction_read, |
| .release = simple_transaction_release, |
| .llseek = generic_file_llseek, |
| }; |
| |
| /** |
| * smk_read_syslog - read() for smackfs/syslog |
| * @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_syslog(struct file *filp, char __user *buf, |
| size_t cn, loff_t *ppos) |
| { |
| struct smack_known *skp; |
| ssize_t rc = -EINVAL; |
| int asize; |
| |
| if (*ppos != 0) |
| return 0; |
| |
| if (smack_syslog_label == NULL) |
| skp = &smack_known_star; |
| else |
| skp = smack_syslog_label; |
| |
| asize = strlen(skp->smk_known) + 1; |
| |
| if (cn >= asize) |
| rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, |
| asize); |
| |
| return rc; |
| } |
| |
| /** |
| * smk_write_syslog - write() for smackfs/syslog |
| * @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_syslog(struct file *file, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| char *data; |
| struct smack_known *skp; |
| 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; |
| else { |
| skp = smk_import_entry(data, count); |
| if (IS_ERR(skp)) |
| rc = PTR_ERR(skp); |
| else |
| smack_syslog_label = skp; |
| } |
| |
| kfree(data); |
| return rc; |
| } |
| |
| static const struct file_operations smk_syslog_ops = { |
| .read = smk_read_syslog, |
| .write = smk_write_syslog, |
| .llseek = default_llseek, |
| }; |
| |
| |
| /** |
| * smk_read_ptrace - read() for /smack/ptrace |
| * @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_ptrace(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", smack_ptrace_rule); |
| rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
| return rc; |
| } |
| |
| /** |
| * smk_write_ptrace - write() for /smack/ptrace |
| * @file: file pointer |
| * @buf: data from user space |
| * @count: bytes sent |
| * @ppos: where to start - must be 0 |
| */ |
| static ssize_t smk_write_ptrace(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 (*ppos != 0 || 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 < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX) |
| return -EINVAL; |
| smack_ptrace_rule = i; |
| |
| return count; |
| } |
| |
| static const struct file_operations smk_ptrace_ops = { |
| .write = smk_write_ptrace, |
| .read = smk_read_ptrace, |
| .llseek = default_llseek, |
| }; |
| |
| /** |
| * smk_fill_super - fill the smackfs superblock |
| * @sb: the empty superblock |
| * @data: unused |
| * @silent: unused |
| * |
| * Fill in the well known entries for the smack filesystem |
| * |
| * 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}, |
| [SMK_CHANGE_RULE] = { |
| "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, |
| [SMK_SYSLOG] = { |
| "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, |
| [SMK_PTRACE] = { |
| "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR}, |
| #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
| [SMK_UNCONFINED] = { |
| "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR}, |
| #endif |
| /* 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 = d_inode(sb->s_root); |
| |
| 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")) |
| 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); |