diff options
Diffstat (limited to 'utils.c')
| -rw-r--r-- | utils.c | 53 |
1 files changed, 49 insertions, 4 deletions
@@ -24,6 +24,9 @@ #include <sys/types.h> #include <unistd.h> #include <sys/wait.h> +#include <string.h> +#include <pwd.h> +#include <grp.h> #include "utils.h" #include "conf.h" @@ -53,15 +56,57 @@ const char *get_shell() { return ret; } -int new_map_id(const char *idtp, pid_t pid, int id) { - // TODO check /etc/sub* for current user subids and map them +struct subid { + char *start; + char *count; +}; + +struct subid parse_sub(const char *idtp, const char *name) { + FILE *f = fopen(aprintf("/etc/sub%s", idtp), "r"); + struct subid res = {NULL, NULL}; + char *line = NULL; + ssize_t len = 0; + while ((len = getline(&line, &len, f)) != -1) { + char *firstcol = strchr(line, ':'); + if (firstcol == NULL || strncmp(name, line, firstcol - line)) + continue; + char *seccol = strchr(firstcol + 1, ':'); + if (seccol == NULL) + continue; + res.start = strndup(firstcol + 1, (seccol - firstcol) - 1); + res.count = strndup(seccol + 1, len - 1 - (seccol - line) - (line[len - 1] == '\n' ? 1 : 0)); + } + free(line); + fclose(f); + return res; +} + +int new_map_id(enum mapidtype type, pid_t pid, int id) { + // TODO possibly we should use all maps provided by sub* files for given + // account. It is common that there is only one mapping but there can + // technically be multiple ones. + char const *idtp; + struct subid subid; + switch (type) { + case MAP_ID_USER: + idtp = "uid"; + struct passwd *upass = getpwuid(getuid()); + subid = parse_sub(idtp, upass->pw_name); + break; + case MAP_ID_GROUP: + idtp = "gid"; + struct group *gpass = getgrgid(getgid()); + subid = parse_sub(idtp, gpass->gr_name); + break; + } pid_t chld = fork(); if (!chld) { char *tool = aprintf("new%smap", idtp); char *const args[] = { - tool, aprintf("%d", pid), + tool, + aprintf("%d", pid), "0", aprintf("%d", id), "1", - "1", "65537", "65536", + subid.start && subid.count ? "1" : NULL, subid.start, subid.count, NULL }; execvp(tool, args); |