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Diffstat (limited to 'security/smack/smackfs.c')
-rw-r--r--security/smack/smackfs.c220
1 files changed, 194 insertions, 26 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 80f4b4a4572..32b24882084 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -52,6 +52,8 @@ enum smk_inos {
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 */
};
/*
@@ -59,6 +61,7 @@ enum smk_inos {
*/
static DEFINE_MUTEX(smack_cipso_lock);
static DEFINE_MUTEX(smack_ambient_lock);
+static DEFINE_MUTEX(smack_syslog_lock);
static DEFINE_MUTEX(smk_netlbladdr_lock);
/*
@@ -90,7 +93,22 @@ int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
* everyone. It is expected that the hat (^) label
* will be used if any label is used.
*/
-char *smack_onlycap;
+struct smack_known *smack_onlycap;
+
+/*
+ * 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.
@@ -139,7 +157,7 @@ const char *smack_cipso_option = SMACK_CIPSO_OPTION;
* SMK_LOADLEN: Smack rule length
*/
#define SMK_OACCESS "rwxa"
-#define SMK_ACCESS "rwxat"
+#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)
@@ -282,6 +300,10 @@ static int smk_perm_from_str(const char *string)
case 'T':
perm |= MAY_TRANSMUTE;
break;
+ case 'l':
+ case 'L':
+ perm |= MAY_LOCK;
+ break;
default:
return perm;
}
@@ -297,7 +319,8 @@ static int smk_perm_from_str(const char *string)
* @import: if non-zero, import labels
* @len: label length limit
*
- * Returns 0 on success, -1 on failure
+ * Returns 0 on success, -EINVAL on failure and -ENOENT when either subject
+ * or object is missing.
*/
static int smk_fill_rule(const char *subject, const char *object,
const char *access1, const char *access2,
@@ -310,28 +333,28 @@ static int smk_fill_rule(const char *subject, const char *object,
if (import) {
rule->smk_subject = smk_import_entry(subject, len);
if (rule->smk_subject == NULL)
- return -1;
+ return -EINVAL;
rule->smk_object = smk_import(object, len);
if (rule->smk_object == NULL)
- return -1;
+ return -EINVAL;
} else {
cp = smk_parse_smack(subject, len);
if (cp == NULL)
- return -1;
+ return -EINVAL;
skp = smk_find_entry(cp);
kfree(cp);
if (skp == NULL)
- return -1;
+ return -ENOENT;
rule->smk_subject = skp;
cp = smk_parse_smack(object, len);
if (cp == NULL)
- return -1;
+ return -EINVAL;
skp = smk_find_entry(cp);
kfree(cp);
if (skp == NULL)
- return -1;
+ return -ENOENT;
rule->smk_object = skp->smk_known;
}
@@ -377,6 +400,7 @@ static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
{
ssize_t cnt = 0;
char *tok[4];
+ int rc;
int i;
/*
@@ -401,10 +425,8 @@ static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
while (i < 4)
tok[i++] = NULL;
- if (smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0))
- return -1;
-
- return cnt;
+ 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 */
@@ -452,7 +474,7 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
/*
* Minor hack for backward compatibility
*/
- if (count != SMK_OLOADLEN && count != SMK_LOADLEN)
+ if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
return -EINVAL;
} else {
if (count >= PAGE_SIZE) {
@@ -592,6 +614,8 @@ static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
seq_putc(s, 'a');
if (srp->smk_access & MAY_TRANSMUTE)
seq_putc(s, 't');
+ if (srp->smk_access & MAY_LOCK)
+ seq_putc(s, 'l');
seq_putc(s, '\n');
}
@@ -1169,7 +1193,7 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
data[count] = '\0';
- rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
+ 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",
@@ -1597,7 +1621,7 @@ static const struct file_operations smk_ambient_ops = {
};
/**
- * smk_read_onlycap - read() for /smack/onlycap
+ * smk_read_onlycap - read() for smackfs/onlycap
* @filp: file pointer, not actually used
* @buf: where to put the result
* @cn: maximum to send along
@@ -1616,7 +1640,7 @@ static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
return 0;
if (smack_onlycap != NULL)
- smack = smack_onlycap;
+ smack = smack_onlycap->smk_known;
asize = strlen(smack) + 1;
@@ -1627,7 +1651,7 @@ static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
}
/**
- * smk_write_onlycap - write() for /smack/onlycap
+ * smk_write_onlycap - write() for smackfs/onlycap
* @file: file pointer, not actually used
* @buf: where to get the data from
* @count: bytes sent
@@ -1650,7 +1674,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
* explicitly for clarity. The smk_access() implementation
* would use smk_access(smack_onlycap, MAY_WRITE)
*/
- if (smack_onlycap != NULL && smack_onlycap != skp->smk_known)
+ if (smack_onlycap != NULL && smack_onlycap != skp)
return -EPERM;
data = kzalloc(count, GFP_KERNEL);
@@ -1670,7 +1694,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
if (copy_from_user(data, buf, count) != 0)
rc = -EFAULT;
else
- smack_onlycap = smk_import(data, count);
+ smack_onlycap = smk_import_entry(data, count);
kfree(data);
return rc;
@@ -1850,11 +1874,12 @@ static ssize_t smk_user_access(struct file *file, const char __user *buf,
res = smk_parse_long_rule(data, &rule, 0, 3);
}
- if (res < 0)
+ if (res >= 0)
+ res = smk_access(rule.smk_subject, rule.smk_object,
+ rule.smk_access1, NULL);
+ else if (res != -ENOENT)
return -EINVAL;
- res = smk_access(rule.smk_subject, rule.smk_object,
- rule.smk_access1, NULL);
data[0] = res == 0 ? '1' : '0';
data[1] = '\0';
@@ -2137,7 +2162,7 @@ static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
/*
* Must have privilege.
*/
- if (!capable(CAP_MAC_ADMIN))
+ if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
@@ -2152,12 +2177,151 @@ static const struct file_operations smk_change_rule_ops = {
};
/**
- * smk_fill_super - fill the /smackfs superblock
+ * 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, 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 (skp == NULL)
+ rc = -EINVAL;
+ else
+ smack_syslog_label = smk_import_entry(data, count);
+ }
+
+ 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 /smack
+ * Fill in the well known entries for the smack filesystem
*
* Returns 0 on success, an error code on failure
*/
@@ -2202,6 +2366,10 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
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},
/* last one */
{""}
};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 11:15:44 +0000