diff options
Diffstat (limited to 'security/smack/smackfs.c')
| -rw-r--r-- | security/smack/smackfs.c | 1169 |
1 files changed, 914 insertions, 255 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 5c32f36..5a4ab14 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -22,7 +22,6 @@ #include <linux/mutex.h> #include <linux/slab.h> #include <net/net_namespace.h> -#include <net/netlabel.h> #include <net/cipso_ipv4.h> #include <linux/seq_file.h> #include <linux/ctype.h> @@ -45,6 +44,13 @@ enum smk_inos { 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) */ }; /* @@ -60,7 +66,7 @@ static DEFINE_MUTEX(smk_netlbladdr_lock); * If it isn't somehow marked, use this. * It can be reset via smackfs/ambient */ -char *smack_net_ambient = smack_known_floor.smk_known; +char *smack_net_ambient; /* * This is the level in a CIPSO header that indicates a @@ -70,6 +76,13 @@ char *smack_net_ambient = smack_known_floor.smk_known; 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 @@ -89,7 +102,7 @@ LIST_HEAD(smk_netlbladdr_list); /* * Rule lists are maintained for each label. - * This master list is just for reading /smack/load. + * This master list is just for reading /smack/load and /smack/load2. */ struct smack_master_list { struct list_head list; @@ -125,6 +138,18 @@ const char *smack_cipso_option = SMACK_CIPSO_OPTION; #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 @@ -137,12 +162,10 @@ static void smk_netlabel_audit_set(struct netlbl_audit *nap) } /* - * Values for parsing single label host rules + * Value for parsing single label host rules * "1.2.3.4 X" - * "192.168.138.129/32 abcdefghijklmnopqrstuvw" */ #define SMK_NETLBLADDRMIN 9 -#define SMK_NETLBLADDRMAX 42 /** * smk_set_access - add a rule to the rule list @@ -188,124 +211,210 @@ static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list, } /** - * smk_parse_rule - parse Smack rule from load string - * @data: string to be parsed whose size is SMK_LOADLEN + * 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; + default: + return perm; + } +} + +/** + * smk_fill_rule - Fill Smack rule from strings + * @subject: subject label string + * @object: object label string + * @access: access string + * @access_remove: string with permissions to be removed * @rule: Smack rule * @import: if non-zero, import labels + * + * Returns 0 on success, -1 on failure */ -static int smk_parse_rule(const char *data, struct smack_rule *rule, int import) +static int smk_fill_rule(const char *subject, const char *object, + const char *access, const char *access_remove, + struct smack_rule *rule, int import) { - char smack[SMK_LABELLEN]; + int rc = -1; + const char *cp; struct smack_known *skp; if (import) { - rule->smk_subject = smk_import(data, 0); + rule->smk_subject = smk_import(subject, 0); if (rule->smk_subject == NULL) return -1; - rule->smk_object = smk_import(data + SMK_LABELLEN, 0); + rule->smk_object = smk_import(object, 0); if (rule->smk_object == NULL) return -1; } else { - smk_parse_smack(data, 0, smack); - skp = smk_find_entry(smack); + cp = smk_parse_smack(subject, 0); + if (cp == NULL) + return -1; + skp = smk_find_entry(cp); + kfree(cp); if (skp == NULL) return -1; rule->smk_subject = skp->smk_known; - smk_parse_smack(data + SMK_LABELLEN, 0, smack); - skp = smk_find_entry(smack); + cp = smk_parse_smack(object, 0); + 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; + if (access_remove) { + rule->smk_access |= smk_perm_from_str(access); + rule->smk_access &= ~smk_perm_from_str(access_remove); + } else + rule->smk_access = smk_perm_from_str(access); - switch (data[SMK_LABELLEN + SMK_LABELLEN]) { - case '-': - break; - case 'r': - case 'R': - rule->smk_access |= MAY_READ; - break; - default: - return -1; - } + rc = 0; - switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { - case '-': - break; - case 'w': - case 'W': - rule->smk_access |= MAY_WRITE; - break; - default: - return -1; - } + return rc; +} - switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { - case '-': - break; - case 'x': - case 'X': - rule->smk_access |= MAY_EXEC; - break; - default: - return -1; - } +/** + * 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; - switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { - case '-': - break; - case 'a': - case 'A': - rule->smk_access |= MAY_APPEND; - break; - default: - return -1; - } + rc = smk_fill_rule(data, data + SMK_LABELLEN, + data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, + import); + return rc; +} - switch (data[SMK_LABELLEN + SMK_LABELLEN + 4]) { - case '-': - break; - case 't': - case 'T': - rule->smk_access |= MAY_TRANSMUTE; - break; - default: +/** + * 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 + * @change: if non-zero, data is from /smack/change-rule + * + * Returns 0 on success, -1 on failure + */ +static int smk_parse_long_rule(const char *data, struct smack_rule *rule, + int import, int change) +{ + char *subject; + char *object; + char *access; + char *access_remove; + int datalen; + int rc = -1; + + /* + * This is probably inefficient, but safe. + */ + datalen = strlen(data); + subject = kzalloc(datalen, 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; + access_remove = kzalloc(datalen, GFP_KERNEL); + if (access_remove == NULL) + goto free_out_a; + + if (change) { + if (sscanf(data, "%s %s %s %s", + subject, object, access, access_remove) == 4) + rc = smk_fill_rule(subject, object, access, + access_remove, rule, import); + } else { + if (sscanf(data, "%s %s %s", subject, object, access) == 3) + rc = smk_fill_rule(subject, object, access, + NULL, rule, import); } - return 0; + kfree(access_remove); +free_out_a: + 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 */ +#define SMK_CHANGE_FMT 2 /* Rule modification format */ /** - * smk_write_load_list - write() for any /smack/load + * 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 is exactly: - * char subject[SMK_LABELLEN] - * char object[SMK_LABELLEN] - * char access[SMK_ACCESSLEN] - * - * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. + * 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_load_list(struct file *file, const char __user *buf, - size_t count, loff_t *ppos, - struct list_head *rule_list, - struct mutex *rule_lock) +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; @@ -315,13 +424,18 @@ static ssize_t smk_write_load_list(struct file *file, const char __user *buf, */ if (*ppos != 0) return -EINVAL; - /* - * Minor hack for backward compatibility - */ - if (count < (SMK_OLOADLEN) || count > SMK_LOADLEN) - return -EINVAL; - data = kzalloc(SMK_LOADLEN, GFP_KERNEL); + if (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; @@ -330,20 +444,33 @@ static ssize_t smk_write_load_list(struct file *file, const char __user *buf, goto out; } - /* - * More on the minor hack for backward compatibility - */ - if (count == (SMK_OLOADLEN)) - data[SMK_OLOADLEN] = '-'; - rule = kzalloc(sizeof(*rule), GFP_KERNEL); if (rule == NULL) { rc = -ENOMEM; goto out; } - if (smk_parse_rule(data, rule, 1)) - goto out_free_rule; + if (format == SMK_LONG_FMT) { + /* + * Be sure the data string is terminated. + */ + data[count] = '\0'; + if (smk_parse_long_rule(data, rule, 1, 0)) + goto out_free_rule; + } else if (format == SMK_CHANGE_FMT) { + data[count] = '\0'; + if (smk_parse_long_rule(data, rule, 1, 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; @@ -354,18 +481,20 @@ static ssize_t smk_write_load_list(struct file *file, const char __user *buf, rc = count; /* - * If this is "load" as opposed to "load-self" and a new rule + * 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 (load && !smk_set_access(rule, rule_list, rule_lock)) { - smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); - if (smlp != NULL) { - smlp->smk_rule = rule; - list_add_rcu(&smlp->list, &smack_rule_list); - } else - rc = -ENOMEM; + 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; } @@ -421,29 +550,21 @@ static void smk_seq_stop(struct seq_file *s, void *v) /* No-op */ } -/* - * Seq_file read operations for /smack/load - */ - -static void *load_seq_start(struct seq_file *s, loff_t *pos) +static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) { - return smk_seq_start(s, pos, &smack_rule_list); -} - -static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) -{ - return smk_seq_next(s, v, pos, &smack_rule_list); -} + /* + * 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; -static int load_seq_show(struct seq_file *s, void *v) -{ - struct list_head *list = v; - struct smack_master_list *smlp = - list_entry(list, struct smack_master_list, list); - struct smack_rule *srp = smlp->smk_rule; + if (srp->smk_access == 0) + return; - seq_printf(s, "%s %s", (char *)srp->smk_subject, - (char *)srp->smk_object); + seq_printf(s, "%s %s", srp->smk_subject, srp->smk_object); seq_putc(s, ' '); @@ -457,17 +578,38 @@ static int load_seq_show(struct seq_file *s, void *v) seq_putc(s, 'a'); if (srp->smk_access & MAY_TRANSMUTE) seq_putc(s, 't'); - if (srp->smk_access == 0) - seq_putc(s, '-'); seq_putc(s, '\n'); +} + +/* + * 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 = load_seq_start, - .next = load_seq_next, + .start = load2_seq_start, + .next = load2_seq_next, .show = load_seq_show, .stop = smk_seq_stop, }; @@ -495,16 +637,16 @@ static int smk_open_load(struct inode *inode, struct file *file) static ssize_t smk_write_load(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - /* * Must have privilege. * No partial writes. * Enough data must be present. */ - if (!capable(CAP_MAC_ADMIN)) + if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; - return smk_write_load_list(file, buf, count, ppos, NULL, NULL); + return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, + SMK_FIXED24_FMT); } static const struct file_operations smk_load_ops = { @@ -574,6 +716,8 @@ static void smk_unlbl_ambient(char *oldambient) 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); @@ -605,27 +749,28 @@ static int cipso_seq_show(struct seq_file *s, void *v) struct list_head *list = v; struct smack_known *skp = list_entry(list, struct smack_known, list); - struct smack_cipso *scp = skp->smk_cipso; - char *cbp; + struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; char sep = '/'; - int cat = 1; int i; - unsigned char m; - if (scp == NULL) + /* + * 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", (char *)&skp->smk_known, scp->smk_level); + seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); - cbp = scp->smk_catset; - for (i = 0; i < SMK_LABELLEN; i++) - for (m = 0x80; m != 0; m >>= 1) { - if (m & cbp[i]) { - seq_printf(s, "%c%d", sep, cat); - sep = ','; - } - cat++; - } + 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'); @@ -653,23 +798,24 @@ static int smk_open_cipso(struct inode *inode, struct file *file) } /** - * smk_write_cipso - write() for /smack/cipso + * 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_write_cipso(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) +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 smack_cipso *scp = NULL; - char mapcatset[SMK_LABELLEN]; + struct netlbl_lsm_secattr ncats; + char mapcatset[SMK_CIPSOLEN]; int maplevel; - int cat; + unsigned int cat; int catlen; ssize_t rc = -EINVAL; char *data = NULL; @@ -682,11 +828,12 @@ static ssize_t smk_write_cipso(struct file *file, const char __user *buf, * No partial writes. * Enough data must be present. */ - if (!capable(CAP_MAC_ADMIN)) + if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; if (*ppos != 0) return -EINVAL; - if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) + if (format == SMK_FIXED24_FMT && + (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) return -EINVAL; data = kzalloc(count + 1, GFP_KERNEL); @@ -698,11 +845,6 @@ static ssize_t smk_write_cipso(struct file *file, const char __user *buf, goto unlockedout; } - /* labels cannot begin with a '-' */ - if (data[0] == '-') { - rc = -EINVAL; - goto unlockedout; - } data[count] = '\0'; rule = data; /* @@ -715,7 +857,11 @@ static ssize_t smk_write_cipso(struct file *file, const char __user *buf, if (skp == NULL) goto out; - rule += SMK_LABELLEN; + 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; @@ -725,41 +871,29 @@ static ssize_t smk_write_cipso(struct file *file, const char __user *buf, if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) goto out; - if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) + 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, "%d", &cat); + ret = sscanf(rule, "%u", &cat); if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) goto out; smack_catset_bit(cat, mapcatset); } - if (skp->smk_cipso == NULL) { - scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); - if (scp == NULL) { - rc = -ENOMEM; - goto out; - } + 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; } - spin_lock_bh(&skp->smk_cipsolock); - - if (scp == NULL) - scp = skp->smk_cipso; - else - skp->smk_cipso = scp; - - scp->smk_level = maplevel; - memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); - - spin_unlock_bh(&skp->smk_cipsolock); - - rc = count; out: mutex_unlock(&smack_cipso_lock); unlockedout: @@ -767,6 +901,22 @@ unlockedout: 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, @@ -776,6 +926,80 @@ static const struct file_operations smk_cipso_ops = { }; /* + * 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 */ @@ -887,9 +1111,9 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, { struct smk_netlbladdr *skp; struct sockaddr_in newname; - char smack[SMK_LABELLEN]; + char *smack; char *sp; - char data[SMK_NETLBLADDRMAX + 1]; + char *data; char *host = (char *)&newname.sin_addr.s_addr; int rc; struct netlbl_audit audit_info; @@ -907,14 +1131,27 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, * "<addr/mask, as a.b.c.d/e><space><label>" * "<addr, as a.b.c.d><space><label>" */ - if (!capable(CAP_MAC_ADMIN)) + if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; if (*ppos != 0) return -EINVAL; - if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX) + if (count < SMK_NETLBLADDRMIN) return -EINVAL; - if (copy_from_user(data, buf, count) != 0) - return -EFAULT; + + 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'; @@ -923,24 +1160,34 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, if (rc != 6) { rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", &host[0], &host[1], &host[2], &host[3], smack); - if (rc != 5) - return -EINVAL; + if (rc != 5) { + rc = -EINVAL; + goto free_out; + } m = BEBITS; } - if (m > BEBITS) - return -EINVAL; + if (m > BEBITS) { + rc = -EINVAL; + goto free_out; + } - /* if smack begins with '-', its an option, don't import it */ + /* + * If smack begins with '-', it is an option, don't import it + */ if (smack[0] != '-') { sp = smk_import(smack, 0); - if (sp == NULL) - return -EINVAL; + 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 - return -EINVAL; + else { + rc = -EINVAL; + goto free_out; + } } for (temp_mask = 0; m > 0; m--) { @@ -1006,6 +1253,11 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, mutex_unlock(&smk_netlbladdr_lock); +free_out: + kfree(smack); +free_data_out: + kfree(data); + return rc; } @@ -1056,7 +1308,7 @@ static ssize_t smk_write_doi(struct file *file, const char __user *buf, char temp[80]; int i; - if (!capable(CAP_MAC_ADMIN)) + if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; if (count >= sizeof(temp) || count == 0) @@ -1119,10 +1371,11 @@ static ssize_t smk_read_direct(struct file *filp, char __user *buf, 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 (!capable(CAP_MAC_ADMIN)) + if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; if (count >= sizeof(temp) || count == 0) @@ -1136,7 +1389,20 @@ static ssize_t smk_write_direct(struct file *file, const char __user *buf, if (sscanf(temp, "%d", &i) != 1) return -EINVAL; - smack_cipso_direct = i; + /* + * 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; } @@ -1148,6 +1414,84 @@ static const struct file_operations smk_direct_ops = { }; /** + * 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 @@ -1195,22 +1539,28 @@ static ssize_t smk_read_ambient(struct file *filp, char __user *buf, static ssize_t smk_write_ambient(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - char in[SMK_LABELLEN]; char *oldambient; - char *smack; + char *smack = NULL; + char *data; + int rc = count; - if (!capable(CAP_MAC_ADMIN)) + if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; - if (count >= SMK_LABELLEN) - return -EINVAL; + data = kzalloc(count + 1, GFP_KERNEL); + if (data == NULL) + return -ENOMEM; - if (copy_from_user(in, buf, count) != 0) - return -EFAULT; + if (copy_from_user(data, buf, count) != 0) { + rc = -EFAULT; + goto out; + } - smack = smk_import(in, count); - if (smack == NULL) - return -EINVAL; + smack = smk_import(data, count); + if (smack == NULL) { + rc = -EINVAL; + goto out; + } mutex_lock(&smack_ambient_lock); @@ -1220,7 +1570,9 @@ static ssize_t smk_write_ambient(struct file *file, const char __user *buf, mutex_unlock(&smack_ambient_lock); - return count; +out: + kfree(data); + return rc; } static const struct file_operations smk_ambient_ops = { @@ -1271,10 +1623,11 @@ static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - char in[SMK_LABELLEN]; + char *data; char *sp = smk_of_task(current->cred->security); + int rc = count; - if (!capable(CAP_MAC_ADMIN)) + if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; /* @@ -1285,11 +1638,9 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, if (smack_onlycap != NULL && smack_onlycap != sp) return -EPERM; - if (count >= SMK_LABELLEN) - return -EINVAL; - - if (copy_from_user(in, buf, count) != 0) - return -EFAULT; + data = kzalloc(count, GFP_KERNEL); + if (data == NULL) + return -ENOMEM; /* * Should the null string be passed in unset the onlycap value. @@ -1297,10 +1648,17 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, * 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. */ - smack_onlycap = smk_import(in, count); + if (copy_from_user(data, buf, count) != 0) + rc = -EFAULT; + else + smack_onlycap = smk_import(data, count); - return count; + kfree(data); + return rc; } static const struct file_operations smk_onlycap_ops = { @@ -1347,7 +1705,7 @@ static ssize_t smk_write_logging(struct file *file, const char __user *buf, char temp[32]; int i; - if (!capable(CAP_MAC_ADMIN)) + if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; if (count >= sizeof(temp) || count == 0) @@ -1398,25 +1756,7 @@ static int load_self_seq_show(struct seq_file *s, void *v) struct smack_rule *srp = list_entry(list, struct smack_rule, list); - seq_printf(s, "%s %s", (char *)srp->smk_subject, - (char *)srp->smk_object); - - seq_putc(s, ' '); - - if (srp->smk_access & MAY_READ) - seq_putc(s, 'r'); - if (srp->smk_access & MAY_WRITE) - seq_putc(s, 'w'); - if (srp->smk_access & MAY_EXEC) - seq_putc(s, 'x'); - if (srp->smk_access & MAY_APPEND) - seq_putc(s, 'a'); - if (srp->smk_access & MAY_TRANSMUTE) - seq_putc(s, 't'); - if (srp->smk_access == 0) - seq_putc(s, '-'); - - seq_putc(s, '\n'); + smk_rule_show(s, srp, SMK_LABELLEN); return 0; } @@ -1430,7 +1770,7 @@ static const struct seq_operations load_self_seq_ops = { /** - * smk_open_load_self - open() for /smack/load-self + * smk_open_load_self - open() for /smack/load-self2 * @inode: inode structure representing file * @file: "load" file pointer * @@ -1454,8 +1794,8 @@ static ssize_t smk_write_load_self(struct file *file, const char __user *buf, { struct task_smack *tsp = current_security(); - return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules, - &tsp->smk_rules_lock); + 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 = { @@ -1467,24 +1807,42 @@ static const struct file_operations smk_load_self_ops = { }; /** - * smk_write_access - handle access check transaction + * 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_write_access(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) +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 (count < SMK_LOADLEN || smk_parse_rule(data, &rule, 0)) + 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, 0); + kfree(cod); + } + + if (res) return -EINVAL; res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access, @@ -1493,7 +1851,23 @@ static ssize_t smk_write_access(struct file *file, const char __user *buf, data[1] = '\0'; simple_transaction_set(file, 2); - return SMK_LOADLEN; + + 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 = { @@ -1503,6 +1877,261 @@ static const struct file_operations smk_access_ops = { .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, +}; + +/** + * 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 (!capable(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_fill_super - fill the /smackfs superblock * @sb: the empty superblock @@ -1539,6 +2168,21 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent) "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}, /* last one */ {""} }; @@ -1581,6 +2225,15 @@ static struct file_system_type smk_fs_type = { 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 * @@ -1597,6 +2250,7 @@ static struct vfsmount *smackfs_mount; static int __init init_smk_fs(void) { int err; + int rc; if (!security_module_enable(&smack_ops)) return 0; @@ -1614,19 +2268,24 @@ static int __init init_smk_fs(void) smk_cipso_doi(); smk_unlbl_ambient(NULL); - mutex_init(&smack_known_floor.smk_rules_lock); - mutex_init(&smack_known_hat.smk_rules_lock); - mutex_init(&smack_known_huh.smk_rules_lock); - mutex_init(&smack_known_invalid.smk_rules_lock); - mutex_init(&smack_known_star.smk_rules_lock); - mutex_init(&smack_known_web.smk_rules_lock); - - INIT_LIST_HEAD(&smack_known_floor.smk_rules); - INIT_LIST_HEAD(&smack_known_hat.smk_rules); - INIT_LIST_HEAD(&smack_known_huh.smk_rules); - INIT_LIST_HEAD(&smack_known_invalid.smk_rules); - INIT_LIST_HEAD(&smack_known_star.smk_rules); - INIT_LIST_HEAD(&smack_known_web.smk_rules); + 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; } |