* src/login_nopam.c: Do not use the YES and NO macros. Use the
booleans true and false instead. Change the prototypes of list_match(), user_match(), from_match(), and string_match() accordingly. Also use booleans internally. * src/login_nopam.c: Add brackets and parenthesis. * src/login_nopam.c: Avoid implicit conversion of pointers / integers / chars to booleans. * src/login_nopam.c: Avoid assignments in comparisons.
This commit is contained in:
nekral-guest
parent
4e0d734598
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46466a8fcc
11
ChangeLog
11
ChangeLog
@ -1,3 +1,14 @@
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2008-06-09 Nicolas François <nicolas.francois@centraliens.net>
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* src/login_nopam.c: Do not use the YES and NO macros. Use the
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booleans true and false instead. Change the prototypes of
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list_match(), user_match(), from_match(), and string_match()
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accordingly. Also use booleans internally.
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* src/login_nopam.c: Add brackets and parenthesis.
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* src/login_nopam.c: Avoid implicit conversion of pointers /
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integers / chars to booleans.
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* src/login_nopam.c: Avoid assignments in comparisons.
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2008-06-09 Nicolas François <nicolas.francois@centraliens.net>
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* src/newgrp.c: Use a bool for is_newgrp, notfound, needspasswd,
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@ -66,14 +66,10 @@
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static char fs[] = ":"; /* field separator */
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static char sep[] = ", \t"; /* list-element separator */
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/* Constants to be used in assignments only, not in comparisons... */
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#define YES 1
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#define NO 0
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static int list_match (char *list, const char *item, int (*match_fn) (const char *, const char *));
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static int user_match (const char *tok, const char *string);
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static int from_match (const char *tok, const char *string);
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static int string_match (const char *tok, const char *string);
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static bool list_match (char *list, const char *item, bool (*match_fn) (const char *, const char *));
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static bool user_match (const char *tok, const char *string);
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static bool from_match (const char *tok, const char *string);
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static bool string_match (const char *tok, const char *string);
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static const char *resolve_hostname (const char *string);
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/* login_access - match username/group and host/tty with access control file */
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@ -84,7 +80,7 @@ int login_access (const char *user, const char *from)
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char *perm; /* becomes permission field */
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char *users; /* becomes list of login names */
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char *froms; /* becomes list of terminals or hosts */
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int match = NO;
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bool match = false;
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int end;
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int lineno = 0; /* for diagnostics */
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@ -95,26 +91,31 @@ int login_access (const char *user, const char *from)
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* mandatory. The first field should be a "+" or "-" character. A
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* non-existing table means no access control.
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*/
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if ((fp = fopen (TABLE, "r"))) {
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while (!match && fgets (line, sizeof (line), fp)) {
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fp = fopen (TABLE, "r");
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if (NULL != fp) {
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while (!match && (fgets (line, sizeof (line), fp) == line)) {
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lineno++;
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if (line[end = strlen (line) - 1] != '\n') {
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end = (int) strlen (line) - 1;
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if (line[end] != '\n') {
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SYSLOG ((LOG_ERR,
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"%s: line %d: missing newline or line too long",
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TABLE, lineno));
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continue;
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}
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if (line[0] == '#')
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if (line[0] == '#') {
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continue; /* comment line */
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while (end > 0 && isspace (line[end - 1]))
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}
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while (end > 0 && isspace (line[end - 1])) {
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end--;
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line[end] = 0; /* strip trailing whitespace */
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if (line[0] == 0) /* skip blank lines */
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}
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line[end] = '\0'; /* strip trailing whitespace */
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if (line[0] == '\0') { /* skip blank lines */
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continue;
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if (!(perm = strtok (line, fs))
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|| !(users = strtok ((char *) 0, fs))
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|| !(froms = strtok ((char *) 0, fs))
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|| strtok ((char *) 0, fs)) {
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}
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if ( ((perm = strtok (line, fs)) == NULL)
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|| ((users = strtok ((char *) 0, fs)) == NULL)
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|| ((froms = strtok ((char *) 0, fs)) == NULL)
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|| (strtok ((char *) 0, fs) != NULL)) {
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SYSLOG ((LOG_ERR,
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"%s: line %d: bad field count",
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TABLE, lineno));
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@ -133,14 +134,14 @@ int login_access (const char *user, const char *from)
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} else if (errno != ENOENT) {
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SYSLOG ((LOG_ERR, "cannot open %s: %m", TABLE));
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}
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return (match == 0 || (line[0] == '+'));
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return (!match || (line[0] == '+'))?1:0;
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}
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/* list_match - match an item against a list of tokens with exceptions */
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static int list_match (char *list, const char *item, int (*match_fn) (const char *, const char*))
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static bool list_match (char *list, const char *item, bool (*match_fn) (const char *, const char*))
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{
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char *tok;
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int match = NO;
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bool match = false;
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/*
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* Process tokens one at a time. We have exhausted all possible matches
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@ -148,22 +149,26 @@ static int list_match (char *list, const char *item, int (*match_fn) (const char
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* a match, look for an "EXCEPT" list and recurse to determine whether
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* the match is affected by any exceptions.
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*/
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for (tok = strtok (list, sep); tok != 0; tok = strtok ((char *) 0, sep)) {
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if (strcasecmp (tok, "EXCEPT") == 0) /* EXCEPT: give up */
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for (tok = strtok (list, sep); tok != NULL; tok = strtok ((char *) 0, sep)) {
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if (strcasecmp (tok, "EXCEPT") == 0) { /* EXCEPT: give up */
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break;
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if ((match = (*match_fn) (tok, item))) /* YES */
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}
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match = (*match_fn) (tok, item);
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if (match) {
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break;
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}
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}
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/* Process exceptions to matches. */
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if (match != NO) {
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while ((tok = strtok ((char *) 0, sep))
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&& strcasecmp (tok, "EXCEPT"))
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if (match) {
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while ( ((tok = strtok ((char *) 0, sep)) != NULL)
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&& (strcasecmp (tok, "EXCEPT") != 0))
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/* VOID */ ;
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if (tok == 0 || list_match ((char *) 0, item, match_fn) == NO)
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if (tok == 0 || !list_match ((char *) 0, item, match_fn)) {
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return (match);
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}
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return (NO);
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}
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return false;
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}
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/* myhostname - figure out local machine name */
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@ -171,33 +176,33 @@ static char *myhostname (void)
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{
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static char name[MAXHOSTNAMELEN + 1] = "";
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if (name[0] == 0) {
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if (name[0] == '\0') {
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gethostname (name, sizeof (name));
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name[MAXHOSTNAMELEN] = 0;
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name[MAXHOSTNAMELEN] = '\0';
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}
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return (name);
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}
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#if HAVE_INNETGR
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/* netgroup_match - match group against machine or user */
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static int
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static bool
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netgroup_match (const char *group, const char *machine, const char *user)
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{
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static char *mydomain = 0;
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static char *mydomain = (char *)0;
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if (mydomain == 0) {
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if (mydomain == (char *)0) {
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static char domain[MAXHOSTNAMELEN + 1];
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getdomainname (domain, MAXHOSTNAMELEN);
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mydomain = domain;
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}
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return innetgr (group, machine, user, mydomain);
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return (innetgr (group, machine, user, mydomain) != 0);
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}
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#endif
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/* user_match - match a username against one token */
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static int user_match (const char *tok, const char *string)
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static bool user_match (const char *tok, const char *string)
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{
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struct group *group;
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@ -209,11 +214,12 @@ static int user_match (const char *tok, const char *string)
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/*
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* If a token has the magic value "ALL" the match always succeeds.
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* Otherwise, return YES if the token fully matches the username, or if
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* Otherwise, return true if the token fully matches the username, or if
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* the token is a group that contains the username.
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*/
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if ((at = strchr (tok + 1, '@')) != 0) { /* split user@host pattern */
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*at = 0;
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at = strchr (tok + 1, '@');
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if (NULL != at) { /* split user@host pattern */
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*at = '\0';
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return ( user_match (tok, string)
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&& from_match (at + 1, myhostname ()));
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#if HAVE_INNETGR
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@ -221,12 +227,14 @@ static int user_match (const char *tok, const char *string)
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return (netgroup_match (tok + 1, (char *) 0, string));
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#endif
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} else if (string_match (tok, string)) { /* ALL or exact match */
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return (YES);
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return true;
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/* local, no need for xgetgrnam */
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} else if ((group = getgrnam (tok))) { /* try group membership */
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for (i = 0; group->gr_mem[i]; i++)
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if (strcasecmp (string, group->gr_mem[i]) == 0)
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return (YES);
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} else if ((group = getgrnam (tok)) != NULL) { /* try group membership */
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for (i = 0; NULL != group->gr_mem[i]; i++) {
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if (strcasecmp (string, group->gr_mem[i]) == 0) {
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return true;
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}
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}
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#ifdef PRIMARY_GROUP_MATCH
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/*
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* If the string is an user whose initial GID matches the token,
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@ -237,12 +245,15 @@ static int user_match (const char *tok, const char *string)
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* getpwnam() doesn't have some nasty side effects. --marekm
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*/
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/* local, no need for xgetpwnam */
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if ((userinf = getpwnam (string)))
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if (userinf->pw_gid == group->gr_gid)
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return (YES);
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userinf = getpwnam (string);
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if (NULL != userinf) {
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if (userinf->pw_gid == group->gr_gid) {
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return true;
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}
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}
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#endif
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}
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return (NO);
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return false;
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}
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static const char *resolve_hostname (const char *string)
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@ -254,8 +265,9 @@ static const char *resolve_hostname (const char *string)
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struct hostent *hp;
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hp = gethostbyname (string);
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if (hp)
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if (NULL != hp) {
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return inet_ntoa (*((struct in_addr *) *(hp->h_addr_list)));
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}
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SYSLOG ((LOG_ERR, "%s - unknown host", string));
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return string;
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@ -263,17 +275,17 @@ static const char *resolve_hostname (const char *string)
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/* from_match - match a host or tty against a list of tokens */
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static int from_match (const char *tok, const char *string)
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static bool from_match (const char *tok, const char *string)
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{
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int tok_len;
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int str_len;
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size_t tok_len;
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size_t str_len;
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/*
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* If a token has the magic value "ALL" the match always succeeds. Return
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* YES if the token fully matches the string. If the token is a domain
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* name, return YES if it matches the last fields of the string. If the
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* token has the magic value "LOCAL", return YES if the string does not
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* contain a "." character. If the token is a network number, return YES
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* true if the token fully matches the string. If the token is a domain
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* name, return true if it matches the last fields of the string. If the
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* token has the magic value "LOCAL", return true if the string does not
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* contain a "." character. If the token is a network number, return true
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* if it matches the head of the string.
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*/
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#if HAVE_INNETGR
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@ -282,35 +294,39 @@ static int from_match (const char *tok, const char *string)
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} else
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#endif
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if (string_match (tok, string)) { /* ALL or exact match */
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return (YES);
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return true;
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} else if (tok[0] == '.') { /* domain: match last fields */
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if ((str_len = strlen (string)) > (tok_len = strlen (tok))
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&& strcasecmp (tok, string + str_len - tok_len) == 0)
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return (YES);
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} else if (strcasecmp (tok, "LOCAL") == 0) { /* local: no dots */
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if (strchr (string, '.') == 0)
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return (YES);
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} else if (tok[(tok_len = strlen (tok)) - 1] == '.' /* network */
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&& strncmp (tok, resolve_hostname (string), tok_len) == 0) {
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return (YES);
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str_len = strlen (string);
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tok_len = strlen (tok);
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if ( (str_len > tok_len)
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&& (strcasecmp (tok, string + str_len - tok_len) == 0)) {
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return true;
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}
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return (NO);
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} else if (strcasecmp (tok, "LOCAL") == 0) { /* local: no dots */
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if (strchr (string, '.') == NULL) {
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return true;
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}
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} else if ( (tok[(tok_len = strlen (tok)) - 1] == '.') /* network */
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&& (strncmp (tok, resolve_hostname (string), tok_len) == 0)) {
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return true;
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}
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return false;
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}
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/* string_match - match a string against one token */
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static int string_match (const char *tok, const char *string)
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static bool string_match (const char *tok, const char *string)
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{
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/*
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* If the token has the magic value "ALL" the match always succeeds.
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* Otherwise, return YES if the token fully matches the string.
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* Otherwise, return true if the token fully matches the string.
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*/
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if (strcasecmp (tok, "ALL") == 0) { /* all: always matches */
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return (YES);
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return true;
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} else if (strcasecmp (tok, string) == 0) { /* try exact match */
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return (YES);
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return true;
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}
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return (NO);
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return false;
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}
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#else /* !USE_PAM */
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