Adding upstream version 1.9.15p5.upstream/1.9.15p5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 505 insertions, 0 deletions

diff --git a/plugins/sudoers/parse.h b/plugins/sudoers/parse.h
new file mode 100644
index 0000000..0764c54
--- /dev/null
+++ b/plugins/sudoers/parse.h
@@ -0,0 +1,505 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 1996, 1998-2000, 2004, 2007-2023
+ *	Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef SUDOERS_PARSE_H
+#define SUDOERS_PARSE_H
+
+#include <sys/stat.h>
+#include <sudo_queue.h>
+
+/* Characters that must be quoted in sudoers. */
+#define SUDOERS_QUOTED		":,=#\""
+#define SUDOERS_QUOTED_CMD	":,= \t#"
+#define SUDOERS_QUOTED_ARG	":,=#"
+
+/* Returns true if string 's' contains meta characters. */
+#define has_meta(s)	(strpbrk(s, "\\?*[]") != NULL)
+
+/* Match by name, not inode, when fuzzing. */
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+# define SUDOERS_NAME_MATCH
+#endif
+
+/* Allowed by policy (rowhammer resistant). */
+#undef ALLOW
+#define ALLOW	 0x52a2925	/* 0101001010100010100100100101 */
+
+/* Denied by policy (rowhammer resistant). */
+#undef DENY
+#define DENY	 0xad5d6da	/* 1010110101011101011011011010 */
+
+/* Neither allowed, nor denied. */
+#undef UNSPEC
+#define UNSPEC	-1
+
+/* Tag implied by root access (SETENV only). */
+#undef IMPLIED
+#define IMPLIED	 2
+
+/*
+ * We must explicitly check against ALLOW and DENY instead testing
+ * that the value is not UNSPEC to avoid potential ROWHAMMER issues.
+ */
+#define SPECIFIED(_v)	((_v) == ALLOW || (_v) == DENY)
+
+/*
+ * Initialize all tags to UNSPEC.
+ */
+#define TAGS_INIT(t)	do {						       \
+    (t)->follow = UNSPEC;						       \
+    (t)->intercept = UNSPEC;						       \
+    (t)->log_input = UNSPEC;						       \
+    (t)->log_output = UNSPEC;						       \
+    (t)->noexec = UNSPEC;						       \
+    (t)->nopasswd = UNSPEC;						       \
+    (t)->send_mail = UNSPEC;						       \
+    (t)->setenv = UNSPEC;						       \
+} while (0)
+
+/*
+ * Copy any tags set in t2 into t, overriding the value in t.
+ */
+#define TAGS_MERGE(t, t2) do {						       \
+    if ((t2).follow != UNSPEC)						       \
+	(t).follow = (t2).follow;					       \
+    if ((t2).intercept != UNSPEC)					       \
+	(t).intercept = (t2).intercept;					       \
+    if ((t2).log_input != UNSPEC)					       \
+	(t).log_input = (t2).log_input;					       \
+    if ((t2).log_output != UNSPEC)					       \
+	(t).log_output = (t2).log_output;				       \
+    if ((t2).noexec != UNSPEC)						       \
+	(t).noexec = (t2).noexec;					       \
+    if ((t2).nopasswd != UNSPEC)					       \
+	(t).nopasswd = (t2).nopasswd;					       \
+    if ((t2).send_mail != UNSPEC)					       \
+	(t).send_mail = (t2).send_mail;					       \
+    if ((t2).setenv != UNSPEC)						       \
+	(t).setenv = (t2).setenv;					       \
+} while (0)
+
+/*
+ * Returns true if any tag are not UNSPEC, else false.
+ */
+#define TAGS_SET(t)							       \
+    ((t).follow != UNSPEC || (t).intercept != UNSPEC ||			       \
+     (t).log_input != UNSPEC || (t).log_output != UNSPEC ||		       \
+     (t).noexec != UNSPEC || (t).nopasswd != UNSPEC ||			       \
+     (t).send_mail != UNSPEC ||	(t).setenv != UNSPEC)
+
+/*
+ * Returns true if the specified tag is not UNSPEC or IMPLIED, else false.
+ */
+#define TAG_SET(tt) \
+    ((tt) == true || (tt) == false)
+
+/*
+ * Returns true if any tags set in nt differ between ot and nt, else false.
+ */
+#define TAGS_CHANGED(ot, nt) \
+    ((TAG_SET((nt).follow) && (nt).follow != (ot).follow) || \
+    (TAG_SET((nt).intercept) && (nt).intercept != (ot).intercept) || \
+    (TAG_SET((nt).log_input) && (nt).log_input != (ot).log_input) || \
+    (TAG_SET((nt).log_output) && (nt).log_output != (ot).log_output) || \
+    (TAG_SET((nt).noexec) && (nt).noexec != (ot).noexec) || \
+    (TAG_SET((nt).nopasswd) && (nt).nopasswd != (ot).nopasswd) || \
+    (TAG_SET((nt).setenv) && (nt).setenv != (ot).setenv) || \
+    (TAG_SET((nt).send_mail) && (nt).send_mail != (ot).send_mail))
+
+/*
+ * Returns true if the runas user and group lists match, else false.
+ */
+#define RUNAS_CHANGED(cs1, cs2) \
+     ((cs1)->runasuserlist != (cs2)->runasuserlist || \
+     (cs1)->runasgrouplist != (cs2)->runasgrouplist)
+
+struct command_digest {
+    TAILQ_ENTRY(command_digest) entries;
+    unsigned int digest_type;
+    char *digest_str;
+};
+
+/*
+ * Tags associated with a command.
+ * Possible values: true, false, IMPLIED, UNSPEC.
+ */
+struct cmndtag {
+    signed int follow: 3;
+    signed int intercept: 3;
+    signed int log_input: 3;
+    signed int log_output: 3;
+    signed int noexec: 3;
+    signed int nopasswd: 3;
+    signed int send_mail: 3;
+    signed int setenv: 3;
+};
+
+/*
+ * Per-command option container struct.
+ */
+struct command_options {
+    time_t notbefore;			/* time restriction */
+    time_t notafter;			/* time restriction */
+    int timeout;			/* command timeout */
+    char *runcwd;			/* working directory */
+    char *runchroot;			/* root directory */
+#ifdef HAVE_SELINUX
+    char *role, *type;			/* SELinux role and type */
+#endif
+#ifdef HAVE_APPARMOR
+    char *apparmor_profile;		/* AppArmor profile */
+#endif
+#ifdef HAVE_PRIV_SET
+    char *privs, *limitprivs;		/* Solaris privilege sets */
+#endif
+};
+
+/*
+ * The parsed sudoers file is stored as a collection of linked lists,
+ * modelled after the yacc grammar.
+ *
+ * Other than the alias struct, which is stored in a red-black tree,
+ * the data structure used is a doubly-linked tail queue.  While sudoers
+ * is being parsed, a headless tail queue is used where the first entry
+ * acts as the head and the prev pointer does double duty as the tail pointer.
+ * This makes it possible to trivially append sub-lists.  In addition, the prev
+ * pointer is always valid (even if it points to itself).  Unlike a circle
+ * queue, the next pointer of the last entry is NULL and does not point back
+ * to the head.  When the tail queue is finalized, it is converted to a
+ * normal BSD tail queue.
+ */
+
+/*
+ * Tail queue list head structures.
+ */
+TAILQ_HEAD(defaults_list, defaults);
+TAILQ_HEAD(userspec_list, userspec);
+TAILQ_HEAD(member_list, member);
+TAILQ_HEAD(privilege_list, privilege);
+TAILQ_HEAD(cmndspec_list, cmndspec);
+TAILQ_HEAD(command_digest_list, command_digest);
+STAILQ_HEAD(comment_list, sudoers_comment);
+TAILQ_HEAD(sudoers_parse_tree_list, sudoers_parse_tree);
+
+/*
+ * Structure describing a user specification and list thereof.
+ */
+struct userspec {
+    TAILQ_ENTRY(userspec) entries;
+    struct member_list users;		/* list of users */
+    struct privilege_list privileges;	/* list of privileges */
+    struct comment_list comments;	/* optional comments */
+    int line;				/* line number in sudoers */
+    int column;				/* column number in sudoers */
+    char *file;				/* name of sudoers file */
+};
+
+/*
+ * Structure describing a privilege specification.
+ */
+struct privilege {
+    TAILQ_ENTRY(privilege) entries;
+    char *ldap_role;			/* LDAP sudoRole */
+    struct member_list hostlist;	/* list of hosts */
+    struct cmndspec_list cmndlist;	/* list of Cmnd_Specs */
+    struct defaults_list defaults;	/* list of sudoOptions */
+};
+
+/*
+ * A command with option args and digest.
+ * XXX - merge into struct member
+ */
+struct sudo_command {
+    char *cmnd;
+    char *args;
+    struct command_digest_list digests;
+};
+
+/*
+ * Structure describing a linked list of Cmnd_Specs.
+ * XXX - include struct command_options instead of its contents inline
+ */
+struct cmndspec {
+    TAILQ_ENTRY(cmndspec) entries;
+    struct member_list *runasuserlist;	/* list of runas users */
+    struct member_list *runasgrouplist;	/* list of runas groups */
+    struct member *cmnd;		/* command to allow/deny */
+    struct cmndtag tags;		/* tag specificaion */
+    int timeout;			/* command timeout */
+    time_t notbefore;			/* time restriction */
+    time_t notafter;			/* time restriction */
+    char *runcwd;			/* working directory */
+    char *runchroot;			/* root directory */
+#ifdef HAVE_SELINUX
+    char *role, *type;			/* SELinux role and type */
+#endif
+#ifdef HAVE_APPARMOR
+    char *apparmor_profile;		/* AppArmor profile */
+#endif
+#ifdef HAVE_PRIV_SET
+    char *privs, *limitprivs;		/* Solaris privilege sets */
+#endif
+};
+
+/*
+ * Generic structure to hold users, hosts, commands.
+ */
+struct member {
+    TAILQ_ENTRY(member) entries;
+    char *name;				/* member name */
+    short type;				/* type (see gram.h) */
+    short negated;			/* negated via '!'? */
+};
+
+struct runascontainer {
+    struct member *runasusers;
+    struct member *runasgroups;
+};
+
+struct defaults_binding {
+    struct member_list members;
+    unsigned int refcnt;
+};
+
+struct sudoers_comment {
+    STAILQ_ENTRY(sudoers_comment) entries;
+    char *str;
+};
+
+/*
+ * Generic structure to hold {User,Host,Runas,Cmnd}_Alias
+ * Aliases are stored in a red-black tree, sorted by name and type.
+ */
+struct alias {
+    char *name;				/* alias name */
+    short type;				/* {USER,HOST,RUNAS,CMND}ALIAS */
+    short used;				/* "used" flag for cycle detection */
+    int line;				/* line number of alias entry */
+    int column;				/* column number of alias entry */
+    char *file;				/* file the alias entry was in */
+    struct member_list members;		/* list of alias members */
+};
+
+/*
+ * Structure describing a Defaults entry in sudoers.
+ */
+struct defaults {
+    TAILQ_ENTRY(defaults) entries;
+    char *var;				/* variable name */
+    char *val;				/* variable value */
+    struct defaults_binding *binding;	/* user/host/runas binding */
+    char *file;				/* file Defaults entry was in */
+    int type;				/* DEFAULTS{,_USER,_RUNAS,_HOST} */
+    int op;				/* true, false, '+', '-' */
+    int line;				/* line number of Defaults entry */
+    int column;				/* column number of Defaults entry */
+};
+
+struct sudoers_match_info {
+    const struct sudoers_parse_tree *parse_tree;
+    const struct userspec *us;		/* matching userspec */
+    const struct privilege *priv;	/* matching privilege */
+    const struct cmndspec *cs;		/* matching cmndspec */
+};
+
+/*
+ * Parsed sudoers policy.
+ */
+struct sudo_nss;
+struct sudoers_parse_tree {
+    TAILQ_ENTRY(sudoers_parse_tree) entries;
+    struct userspec_list userspecs;
+    struct defaults_list defaults;
+    struct rbtree *aliases;
+    char *shost, *lhost;
+    struct sudo_nss *nss;
+    struct sudoers_context *ctx;
+};
+
+/*
+ * Info about the command being resolved.
+ */
+struct cmnd_info {
+    struct stat cmnd_stat;
+    char *cmnd_path;
+    int status;
+};
+
+/*
+ * Optional callback for sudoers_lookup().
+ */
+typedef void (*sudoers_lookup_callback_fn_t)(const struct sudoers_parse_tree *parse_tree, const struct userspec *us, int user_match, const struct privilege *priv, int host_match, const struct cmndspec *cs, int date_match, int runas_match, int cmnd_match, void *closure);
+
+/*
+ * The parser passes pointers to data structures that are not stored anywhere.
+ * We add them to the leak list at allocation time and remove them from
+ * the list when they are stored in another data structure.
+ * This makes it possible to free data on error that would otherwise be leaked.
+ */
+enum parser_leak_types {
+    LEAK_UNKNOWN,
+    LEAK_PRIVILEGE,
+    LEAK_CMNDSPEC,
+    LEAK_DEFAULTS,
+    LEAK_MEMBER,
+    LEAK_DIGEST,
+    LEAK_RUNAS,
+    LEAK_PTR
+};
+struct parser_leak_entry {
+    SLIST_ENTRY(parser_leak_entry) entries;
+    enum parser_leak_types type;
+    union {
+	struct command_digest *dig;
+	struct privilege *p;
+	struct cmndspec *cs;
+	struct defaults *d;
+	struct member *m;
+	struct runascontainer *rc;
+	void *ptr;
+    } u;
+};
+SLIST_HEAD(parser_leak_list, parser_leak_entry);
+
+#define YY_DECL int sudoerslex(void)
+
+/* alias.c */
+struct rbtree *alloc_aliases(void);
+void free_aliases(struct rbtree *aliases);
+bool no_aliases(const struct sudoers_parse_tree *parse_tree);
+bool alias_add(struct sudoers_parse_tree *parse_tree, char *name, short type, char *file, int line, int column, struct member *members);
+const char *alias_type_to_string(short alias_type);
+struct alias *alias_get(const struct sudoers_parse_tree *parse_tree, const char *name, short type);
+struct alias *alias_remove(struct sudoers_parse_tree *parse_tree, const char *name, short type);
+bool alias_find_used(struct sudoers_parse_tree *parse_tree, struct rbtree *used_aliases);
+void alias_apply(struct sudoers_parse_tree *parse_tree, int (*func)(struct sudoers_parse_tree *, struct alias *, void *), void *cookie);
+void alias_free(void *a);
+void alias_put(struct alias *a);
+
+/* check_aliases.c */
+int check_aliases(struct sudoers_parse_tree *parse_tree, bool strict, bool quiet, int (*cb_unused)(struct sudoers_parse_tree *, struct alias *, void *));
+
+/* gram.y */
+extern bool parse_error;
+extern struct sudoers_parse_tree parsed_policy;
+extern bool (*sudoers_error_hook)(const struct sudoers_context *ctx, const char *file, int line, int column, const char * restrict fmt, va_list args);
+bool reset_parser(void);
+void free_member(struct member *m);
+void free_members(struct member_list *members);
+void free_cmndspec(struct cmndspec *cs, struct cmndspec_list *csl);
+void free_cmndspecs(struct cmndspec_list *csl);
+void free_privilege(struct privilege *priv);
+void free_userspec(struct userspec *us);
+void free_userspecs(struct userspec_list *usl);
+void free_default(struct defaults *def);
+void free_defaults(struct defaults_list *defs);
+bool init_parser(struct sudoers_context *ctx, const char *file);
+void init_parse_tree(struct sudoers_parse_tree *parse_tree, char *lhost, char *shost, struct sudoers_context *ctx, struct sudo_nss *nss);
+void free_parse_tree(struct sudoers_parse_tree *parse_tree);
+bool parser_leak_add(enum parser_leak_types type, void *v);
+bool parser_leak_remove(enum parser_leak_types type, void *v);
+void parser_leak_init(void);
+void reparent_parse_tree(struct sudoers_parse_tree *new_tree);
+int sudoersparse(void);
+uid_t sudoers_file_uid(void);
+gid_t sudoers_file_gid(void);
+mode_t sudoers_file_mode(void);
+bool sudoers_error_recovery(void);
+bool sudoers_strict(void);
+
+/* match_addr.c */
+int addr_matches(char *n);
+
+/* match_command.c */
+int command_matches(struct sudoers_context *ctx, const char *sudoers_cmnd, const char *sudoers_args, const char *runchroot, struct cmnd_info *info, const struct command_digest_list *digests);
+
+/* match_digest.c */
+int digest_matches(int fd, const char *path, const struct command_digest_list *digests);
+
+/* match.c */
+struct group;
+struct passwd;
+int group_matches(const char *sudoers_group, const struct group *gr);
+int hostname_matches(const char *shost, const char *lhost, const char *pattern);
+int netgr_matches(const struct sudo_nss *nss, const char *netgr, const char *lhost, const char *shost, const char *user);
+int usergr_matches(const char *group, const char *user, const struct passwd *pw);
+int userpw_matches(const char *sudoers_user, const char *user, const struct passwd *pw);
+int cmnd_matches(const struct sudoers_parse_tree *parse_tree, const struct member *m, const char *runchroot, struct cmnd_info *info);
+int cmnd_matches_all(const struct sudoers_parse_tree *parse_tree, const struct member *m, const char *runchroot, struct cmnd_info *info);
+int cmndlist_matches(const struct sudoers_parse_tree *parse_tree, const struct member_list *list, const char *runchroot, struct cmnd_info *info);
+int host_matches(const struct sudoers_parse_tree *parse_tree, const struct passwd *pw, const char *host, const char *shost, const struct member *m);
+int hostlist_matches(const struct sudoers_parse_tree *parse_tree, const struct passwd *pw, const struct member_list *list);
+int runaslist_matches(const struct sudoers_parse_tree *parse_tree, const struct member_list *user_list, const struct member_list *group_list, struct member **matching_user, struct member **matching_group);
+int user_matches(const struct sudoers_parse_tree *parse_tree, const struct passwd *pw, const struct member *m);
+int userlist_matches(const struct sudoers_parse_tree *parse_tree, const struct passwd *pw, const struct member_list *list);
+const char *sudo_getdomainname(void);
+struct gid_list *runas_getgroups(const struct sudoers_context *ctx);
+
+/* toke.l */
+YY_DECL;
+void sudoersrestart(FILE *);
+extern FILE *sudoersin;
+extern char *sudoers;
+
+/* base64.c */
+size_t base64_decode(const char *str, unsigned char *dst, size_t dsize);
+size_t base64_encode(const unsigned char *in, size_t in_len, char *out, size_t out_len);
+
+/* timeout.c */
+int parse_timeout(const char *timestr);
+
+/* gentime.c */
+time_t parse_gentime(const char *expstr);
+
+/* filedigest.c */
+unsigned char *sudo_filedigest(int fd, const char *file, unsigned int digest_type, size_t *digest_len);
+
+/* digestname.c */
+const char *digest_type_to_name(unsigned int digest_type);
+
+/* parse.c */
+struct sudo_nss_list;
+unsigned int sudoers_lookup(struct sudo_nss_list *snl, struct sudoers_context *ctx, time_t now, sudoers_lookup_callback_fn_t callback, void *cb_data, int *cmnd_status, int pwflag);
+
+/* display.c */
+int display_privs(struct sudoers_context *ctx, const struct sudo_nss_list *snl, struct passwd *pw, int verbose);
+int display_cmnd(struct sudoers_context *ctx, const struct sudo_nss_list *snl, struct passwd *pw, int verbose);
+
+/* parse_ldif.c */
+bool sudoers_parse_ldif(struct sudoers_parse_tree *parse_tree, FILE *fp, const char *sudoers_base, bool store_options);
+
+/* fmtsudoers.c */
+struct sudo_lbuf;
+bool sudoers_format_cmndspec(struct sudo_lbuf *lbuf, const struct sudoers_parse_tree *parse_tree, const struct cmndspec *cs, const struct cmndspec *prev_cs, struct cmndtag tags, bool expand_aliases);
+bool sudoers_format_default(struct sudo_lbuf *lbuf, const struct defaults *d);
+bool sudoers_format_member(struct sudo_lbuf *lbuf, const struct sudoers_parse_tree *parse_tree, const struct member *m, const char *separator, short alias_type);
+bool sudoers_defaults_to_tags(const char *var, const char *val, int op, struct cmndtag *tags);
+bool sudoers_defaults_list_to_tags(const struct defaults_list *defs, struct cmndtag *tags);
+
+/* fmtsudoers_cvt.c */
+bool sudoers_format_privilege(struct sudo_lbuf *lbuf, const struct sudoers_parse_tree *parse_tree, const struct privilege *priv, bool expand_aliases);
+bool sudoers_format_userspec(struct sudo_lbuf *lbuf, const struct sudoers_parse_tree *parse_tree, const struct userspec *us, bool expand_aliases);
+bool sudoers_format_userspecs(struct sudo_lbuf *lbuf, const struct sudoers_parse_tree *parse_tree, const char *separator, bool expand_aliases, bool flush);
+bool sudoers_format_default_line(struct sudo_lbuf *lbuf, const struct sudoers_parse_tree *parse_tree, const struct defaults *d, struct defaults **next, bool expand_aliases);
+
+/* parser_warnx.c */
+bool parser_warnx(const struct sudoers_context *ctx, const char *file, int line, int column, bool strict, bool quiet, const char * restrict fmt, ...) sudo_printflike(7, 8);
+bool parser_vwarnx(const struct sudoers_context *ctx, const char *file, int line, int column, bool strict, bool quiet, const char * restrict fmt, va_list ap) sudo_printflike(7, 0);
+
+#endif /* SUDOERS_PARSE_H */