378 lines
8.3 KiB
C
378 lines
8.3 KiB
C
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <pwd.h>
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#include <grp.h>
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#include <sys/types.h>
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#include <sys/acl.h>
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#ifndef BOOL
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#define BOOL int
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#endif
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#ifndef TRUE
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#define TRUE (1)
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#endif
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#ifndef FALSE
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#define FALSE (0)
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#endif
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#ifndef ILLEGAL_MODE
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#define ILLEGAL_MODE ((mode_t)0xffffffff)
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#endif
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typedef enum {
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NoAction,
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Set,
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Modify,
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Delete,
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ModNDel,
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SetFromFile
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} action_t;
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char *myname;
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int usage ()
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{
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fprintf(stderr, "usage: %s [-r] -s acl_entries file...\n", myname);
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fprintf(stderr, " %s [-r] -md acl_entries file...\n", myname);
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fprintf(stderr, " %s [-r] -f acl_file file...\n", myname);
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return 1;
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}
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mode_t getperm (char *in)
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{
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if (isdigit (*in) && !in[1])
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{
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int i = atoi (in);
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if (i < 0 || i > 7)
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return ILLEGAL_MODE;
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return i << 6 | i << 3 | i;
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}
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if (strlen (in) != 3)
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return ILLEGAL_MODE;
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if (!strchr ("r-", in[0])
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|| !strchr ("w-", in[1])
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|| !strchr ("x-", in[2]))
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return ILLEGAL_MODE;
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return (in[0] == 'r' ? S_IRUSR | S_IRGRP | S_IROTH : 0)
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| (in[1] == 'w' ? S_IWUSR | S_IWGRP | S_IWOTH : 0)
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| (in[2] == 'x' ? S_IXUSR | S_IXGRP | S_IXOTH : 0);
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}
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BOOL
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getaclentry (action_t action, char *c, aclent_t *ace)
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{
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char *c2;
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ace->a_type = 0;
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ace->a_id = 0;
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ace->a_perm = 0;
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if (!strncmp (c, "default:", 8)
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|| !strncmp (c, "d:", 2))
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{
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ace->a_type = ACL_DEFAULT;
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c = strchr (c, ':') + 1;
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}
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if (!strncmp (c, "user:", 5)
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|| !strncmp (c, "u:", 2))
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{
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ace->a_type |= USER_OBJ;
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c = strchr (c, ':') + 1;
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}
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else if (!strncmp (c, "group:", 6)
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|| !strncmp (c, "g:", 2))
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{
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ace->a_type |= GROUP_OBJ;
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c = strchr (c, ':') + 1;
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}
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else if (!strncmp (c, "mask:", 5)
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|| !strncmp (c, "m:", 2))
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{
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if (!(ace->a_type & ACL_DEFAULT))
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return FALSE;
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ace->a_type |= CLASS_OBJ;
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c = strchr (c, ':') + 1;
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}
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else if (!strncmp (c, "other:", 6)
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|| !strncmp (c, "o:", 2))
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{
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if (!(ace->a_type & ACL_DEFAULT))
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return FALSE;
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ace->a_type |= OTHER_OBJ;
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c = strchr (c, ':') + 1;
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}
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else
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return FALSE;
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if (ace->a_type & (USER_OBJ | GROUP_OBJ))
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{
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if (c2 = strchr (c, ':'))
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{
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if (action == Delete)
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return FALSE;
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*c2 = '\0';
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}
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else if (action != Delete)
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return FALSE;
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if (c2 == c)
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{
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if (action == Delete)
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return FALSE;
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}
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else if (isdigit (*c))
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{
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char *c3;
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ace->a_id = strtol (c, &c3, 10);
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if (*c3)
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return FALSE;
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}
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else if (ace->a_type & USER_OBJ)
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{
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struct passwd *pw = getpwnam (c);
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if (!pw)
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return FALSE;
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ace->a_id = pw->pw_uid;
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}
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else
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{
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struct group *gr = getgrnam (c);
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if (!gr)
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return FALSE;
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ace->a_id = gr->gr_gid;
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}
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if (ace->a_type & USER_OBJ)
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{
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ace->a_type &= ~USER_OBJ;
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ace->a_type |= USER;
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}
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else
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{
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ace->a_type &= ~GROUP_OBJ;
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ace->a_type |= GROUP;
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}
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if (c2)
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c = c2 + 1;
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}
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if (action == Delete)
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{
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if ((ace->a_type & (CLASS_OBJ | OTHER_OBJ))
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&& *c)
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return FALSE;
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ace->a_perm = ILLEGAL_MODE;
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return TRUE;
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}
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if ((ace->a_perm = getperm (c)) == ILLEGAL_MODE)
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return FALSE;
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return TRUE;
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}
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BOOL
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getaclentries (action_t action, char *buf, aclent_t *acls, int *idx)
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{
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char *c;
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if (action == SetFromFile)
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{
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FILE *fp;
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char fbuf[256];
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if (! (fp = fopen (buf, "r")))
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return FALSE;
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while (fgets (fbuf, 256, fp))
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{
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if (!getaclentry (action, fbuf, acls + (*idx)++))
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{
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fclose (fp);
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return FALSE;
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}
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}
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fclose (fp);
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}
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else
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for (c = strtok (buf, ","); c; c = strtok (NULL, ","))
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if (!getaclentry (action, c, acls + (*idx)++))
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return FALSE;
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return TRUE;
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}
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int
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searchace (aclent_t *aclp, int nentries, int type, int id)
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{
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int i;
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for (i = 0; i < nentries; ++i)
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if ((aclp[i].a_type == type && (id < 0 || aclp[i].a_id == id))
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|| !aclp[i].a_type)
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return i;
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return -1;
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}
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int
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modacl (aclent_t *tgt, int tcnt, aclent_t *src, int scnt)
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{
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int t, s, i;
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for (s = 0; s < scnt; ++s)
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{
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t = searchace (tgt, MAX_ACL_ENTRIES, src[s].a_type,
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(src[s].a_type & (USER | GROUP)) ? src[s].a_id : -1);
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if (t < 0)
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return -1;
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if (src[s].a_perm == ILLEGAL_MODE)
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{
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if (t < tcnt)
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{
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for (i = t + 1; i < tcnt; ++i)
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tgt[i - 1] = tgt[i];
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--tcnt;
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}
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}
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else
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{
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tgt[t] = src[s];
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if (t >= tcnt)
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++tcnt;
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}
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}
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return tcnt;
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}
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void
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setfacl (action_t action, char *path, aclent_t *acls, int cnt)
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{
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aclent_t lacl[MAX_ACL_ENTRIES];
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int lcnt;
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memset (lacl, 0, sizeof lacl);
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if (action == Set)
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{
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if (acl (path, SETACL, cnt, acls))
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perror (myname);
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return;
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}
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if ((lcnt = acl (path, GETACL, MAX_ACL_ENTRIES, lacl)) < 0
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|| (lcnt = modacl (lacl, lcnt, acls, cnt)) < 0
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|| (lcnt = acl (path, SETACL, lcnt, lacl)) < 0)
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perror (myname);
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}
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int
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main (int argc, char **argv)
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{
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extern char *optarg;
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extern int optind;
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int c;
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action_t action = NoAction;
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int ropt = 0;
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aclent_t acls[MAX_ACL_ENTRIES];
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int aclidx = 0;
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myname = argv[0];
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memset (acls, 0, sizeof acls);
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while ((c = getopt (argc, argv, "d:f:m:rs:")) != EOF)
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switch (c)
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{
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case 'd':
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if (action == NoAction)
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action = Delete;
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else if (action == Modify)
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action = ModNDel;
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else
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return usage ();
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if (! getaclentries (Delete, optarg, acls, &aclidx))
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{
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fprintf (stderr, "%s: illegal acl entries\n", myname);
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return 2;
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}
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break;
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case 'f':
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if (action == NoAction)
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action = Set;
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else
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return usage ();
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if (! getaclentries (SetFromFile, optarg, acls, &aclidx))
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{
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fprintf (stderr, "%s: illegal acl entries\n", myname);
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return 2;
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}
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break;
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case 'm':
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if (action == NoAction)
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action = Modify;
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else if (action == Delete)
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action = ModNDel;
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else
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return usage ();
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if (! getaclentries (Modify, optarg, acls, &aclidx))
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{
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fprintf (stderr, "%s: illegal acl entries\n", myname);
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return 2;
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}
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break;
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case 'r':
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if (!ropt)
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ropt = 1;
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else
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return usage ();
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break;
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case 's':
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if (action == NoAction)
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action = Set;
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else
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return usage ();
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break;
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if (! getaclentries (Set, optarg, acls, &aclidx))
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{
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fprintf (stderr, "%s: illegal acl entries\n", myname);
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return 2;
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}
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default:
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return usage ();
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}
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if (action == NoAction)
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return usage ();
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if (optind > argc - 1)
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return usage ();
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if (action == Set)
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switch (aclcheck (acls, aclidx, NULL))
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{
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case GRP_ERROR:
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fprintf (stderr, "%s: more than one group entry.\n", myname);
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return 2;
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case USER_ERROR:
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fprintf (stderr, "%s: more than one user entry.\n", myname);
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return 2;
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case CLASS_ERROR:
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fprintf (stderr, "%s: more than one mask entry.\n", myname);
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return 2;
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case OTHER_ERROR:
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fprintf (stderr, "%s: more than one other entry.\n", myname);
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return 2;
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case DUPLICATE_ERROR:
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fprintf (stderr, "%s: duplicate additional user or group.\n", myname);
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return 2;
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case ENTRY_ERROR:
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fprintf (stderr, "%s: invalid entry type.\n", myname);
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return 2;
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case MISS_ERROR:
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fprintf (stderr, "%s: missing entries.\n", myname);
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return 2;
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case MEM_ERROR:
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fprintf (stderr, "%s: out of memory.\n", myname);
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return 2;
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default:
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break;
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}
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for (c = optind; c < argc; ++c)
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setfacl (action, argv[c], acls, aclidx);
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return 0;
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}
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