diff options
Diffstat (limited to 'pw/pw_group.c')
| -rw-r--r-- | pw/pw_group.c | 424 |
1 files changed, 424 insertions, 0 deletions
diff --git a/pw/pw_group.c b/pw/pw_group.c new file mode 100644 index 0000000..f4f2116 --- /dev/null +++ b/pw/pw_group.c @@ -0,0 +1,424 @@ +/*- + * Copyright (C) 1996 + * David L. Nugent. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static const char rcsid[] = + "$FreeBSD$"; +#endif /* not lint */ + +#include <ctype.h> +#include <err.h> +#include <termios.h> +#include <stdbool.h> +#include <unistd.h> +#include <grp.h> +#include <libutil.h> + +#include "pw.h" +#include "bitmap.h" + + +static struct passwd *lookup_pwent(const char *user); +static void delete_members(char ***members, int *grmembers, int *i, + struct carg *arg, struct group *grp); +static int print_group(struct group * grp, int pretty); +static gid_t gr_gidpolicy(struct userconf * cnf, struct cargs * args); + +int +pw_group(struct userconf * cnf, int mode, struct cargs * args) +{ + int rc; + struct carg *a_name = getarg(args, 'n'); + struct carg *a_gid = getarg(args, 'g'); + struct carg *arg; + struct group *grp = NULL; + int grmembers = 0; + char **members = NULL; + + static struct group fakegroup = + { + "nogroup", + "*", + -1, + NULL + }; + + if (mode == M_LOCK || mode == M_UNLOCK) + errx(EX_USAGE, "'lock' command is not available for groups"); + + /* + * With M_NEXT, we only need to return the + * next gid to stdout + */ + if (mode == M_NEXT) { + gid_t next = gr_gidpolicy(cnf, args); + if (getarg(args, 'q')) + return next; + printf("%ld\n", (long)next); + return EXIT_SUCCESS; + } + + if (mode == M_PRINT && getarg(args, 'a')) { + int pretty = getarg(args, 'P') != NULL; + + SETGRENT(); + while ((grp = GETGRENT()) != NULL) + print_group(grp, pretty); + ENDGRENT(); + return EXIT_SUCCESS; + } + if (a_gid == NULL) { + if (a_name == NULL) + errx(EX_DATAERR, "group name or id required"); + + if (mode != M_ADD && grp == NULL && isdigit((unsigned char)*a_name->val)) { + (a_gid = a_name)->ch = 'g'; + a_name = NULL; + } + } + grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val)); + + if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) { + if (a_name == NULL && grp == NULL) /* Try harder */ + grp = GETGRGID(atoi(a_gid->val)); + + if (grp == NULL) { + if (mode == M_PRINT && getarg(args, 'F')) { + char *fmems[1]; + fmems[0] = NULL; + fakegroup.gr_name = a_name ? a_name->val : "nogroup"; + fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1; + fakegroup.gr_mem = fmems; + return print_group(&fakegroup, getarg(args, 'P') != NULL); + } + errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val); + } + if (a_name == NULL) /* Needed later */ + a_name = addarg(args, 'n', grp->gr_name); + + /* + * Handle deletions now + */ + if (mode == M_DELETE) { + gid_t gid = grp->gr_gid; + + rc = delgrent(grp); + if (rc == -1) + err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name); + else if (rc != 0) { + warn("group update"); + return EX_IOERR; + } + pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid); + return EXIT_SUCCESS; + } else if (mode == M_PRINT) + return print_group(grp, getarg(args, 'P') != NULL); + + if (a_gid) + grp->gr_gid = (gid_t) atoi(a_gid->val); + + if ((arg = getarg(args, 'l')) != NULL) + grp->gr_name = pw_checkname((u_char *)arg->val, 0); + } else { + if (a_name == NULL) /* Required */ + errx(EX_DATAERR, "group name required"); + else if (grp != NULL) /* Exists */ + errx(EX_DATAERR, "group name `%s' already exists", a_name->val); + + extendarray(&members, &grmembers, 200); + members[0] = NULL; + grp = &fakegroup; + grp->gr_name = pw_checkname((u_char *)a_name->val, 0); + grp->gr_passwd = "*"; + grp->gr_gid = gr_gidpolicy(cnf, args); + grp->gr_mem = members; + } + + /* + * This allows us to set a group password Group passwords is an + * antique idea, rarely used and insecure (no secure database) Should + * be discouraged, but it is apparently still supported by some + * software. + */ + + if ((arg = getarg(args, 'h')) != NULL || + (arg = getarg(args, 'H')) != NULL) { + if (strcmp(arg->val, "-") == 0) + grp->gr_passwd = "*"; /* No access */ + else { + int fd = atoi(arg->val); + int precrypt = (arg->ch == 'H'); + int b; + int istty = isatty(fd); + struct termios t; + char *p, line[256]; + + if (istty) { + if (tcgetattr(fd, &t) == -1) + istty = 0; + else { + struct termios n = t; + + /* Disable echo */ + n.c_lflag &= ~(ECHO); + tcsetattr(fd, TCSANOW, &n); + printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name); + fflush(stdout); + } + } + b = read(fd, line, sizeof(line) - 1); + if (istty) { /* Restore state */ + tcsetattr(fd, TCSANOW, &t); + fputc('\n', stdout); + fflush(stdout); + } + if (b < 0) { + warn("-h file descriptor"); + return EX_OSERR; + } + line[b] = '\0'; + if ((p = strpbrk(line, " \t\r\n")) != NULL) + *p = '\0'; + if (!*line) + errx(EX_DATAERR, "empty password read on file descriptor %d", fd); + if (precrypt) { + if (strchr(line, ':') != NULL) + return EX_DATAERR; + grp->gr_passwd = line; + } else + grp->gr_passwd = pw_pwcrypt(line); + } + } + + if (((arg = getarg(args, 'M')) != NULL || + (arg = getarg(args, 'd')) != NULL || + (arg = getarg(args, 'm')) != NULL) && arg->val) { + int i = 0; + char *p; + struct passwd *pwd; + + /* Make sure this is not stay NULL with -M "" */ + extendarray(&members, &grmembers, 200); + if (arg->ch == 'd') + delete_members(&members, &grmembers, &i, arg, grp); + else if (arg->ch == 'm') { + int k = 0; + + while (grp->gr_mem[k] != NULL) { + if (extendarray(&members, &grmembers, i + 2) != -1) + members[i++] = grp->gr_mem[k]; + k++; + } + } + + if (arg->ch != 'd') + for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) { + int j; + + /* + * Check for duplicates + */ + pwd = lookup_pwent(p); + for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++) + ; + if (j == i && extendarray(&members, &grmembers, i + 2) != -1) + members[i++] = newstr(pwd->pw_name); + } + while (i < grmembers) + members[i++] = NULL; + grp->gr_mem = members; + } + + if (getarg(args, 'N') != NULL) + return print_group(grp, getarg(args, 'P') != NULL); + + if (mode == M_ADD && (rc = addgrent(grp)) != 0) { + if (rc == -1) + warnx("group '%s' already exists", grp->gr_name); + else + warn("group update"); + return EX_IOERR; + } else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) { + if (rc == -1) + warnx("group '%s' not available (NIS?)", grp->gr_name); + else + warn("group update"); + return EX_IOERR; + } + /* grp may have been invalidated */ + if ((grp = GETGRNAM(a_name->val)) == NULL) + errx(EX_SOFTWARE, "group disappeared during update"); + + pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid); + + if (members) + free(members); + + return EXIT_SUCCESS; +} + + +/* + * Lookup a passwd entry using a name or UID. + */ +static struct passwd * +lookup_pwent(const char *user) +{ + struct passwd *pwd; + + if ((pwd = GETPWNAM(user)) == NULL && + (!isdigit((unsigned char)*user) || + (pwd = getpwuid((uid_t) atoi(user))) == NULL)) + errx(EX_NOUSER, "user `%s' does not exist", user); + + return (pwd); +} + + +/* + * Delete requested members from a group. + */ +static void +delete_members(char ***members, int *grmembers, int *i, struct carg *arg, + struct group *grp) +{ + bool matchFound; + char *user; + char *valueCopy; + char *valuePtr; + int k; + struct passwd *pwd; + + k = 0; + while (grp->gr_mem[k] != NULL) { + matchFound = false; + if ((valueCopy = strdup(arg->val)) == NULL) + errx(EX_UNAVAILABLE, "out of memory"); + valuePtr = valueCopy; + while ((user = strsep(&valuePtr, ", \t")) != NULL) { + pwd = lookup_pwent(user); + if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) { + matchFound = true; + break; + } + } + free(valueCopy); + + if (!matchFound && + extendarray(members, grmembers, *i + 2) != -1) + (*members)[(*i)++] = grp->gr_mem[k]; + + k++; + } + + return; +} + + +static gid_t +gr_gidpolicy(struct userconf * cnf, struct cargs * args) +{ + struct group *grp; + gid_t gid = (gid_t) - 1; + struct carg *a_gid = getarg(args, 'g'); + + /* + * Check the given gid, if any + */ + if (a_gid != NULL) { + gid = (gid_t) atol(a_gid->val); + + if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL) + errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid); + } else { + struct bitmap bm; + + /* + * We need to allocate the next available gid under one of + * two policies a) Grab the first unused gid b) Grab the + * highest possible unused gid + */ + if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */ + cnf->min_gid = 1000; + cnf->max_gid = 32000; + } + bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1); + + /* + * Now, let's fill the bitmap from the password file + */ + SETGRENT(); + while ((grp = GETGRENT()) != NULL) + if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid && + (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid) + bm_setbit(&bm, grp->gr_gid - cnf->min_gid); + ENDGRENT(); + + /* + * Then apply the policy, with fallback to reuse if necessary + */ + if (cnf->reuse_gids) + gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); + else { + gid = (gid_t) (bm_lastset(&bm) + 1); + if (!bm_isset(&bm, gid)) + gid += cnf->min_gid; + else + gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); + } + + /* + * Another sanity check + */ + if (gid < cnf->min_gid || gid > cnf->max_gid) + errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used"); + bm_dealloc(&bm); + } + return gid; +} + + +static int +print_group(struct group * grp, int pretty) +{ + if (!pretty) { + char *buf = NULL; + + buf = gr_make(grp); + fputs(buf, stdout); + free(buf); + } else { + int i; + + printf("Group Name: %-15s #%lu\n" + " Members: ", + grp->gr_name, (long) grp->gr_gid); + for (i = 0; grp->gr_mem[i]; i++) + printf("%s%s", i ? "," : "", grp->gr_mem[i]); + fputs("\n\n", stdout); + } + return EXIT_SUCCESS; +} |