user_list.c

   1 /*
   2  * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file user_list.c user handling for para_server */
   8
   9 #include <sys/types.h>
  10 #include <dirent.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "fd.h"
  15 #include "string.h"
  16 #include "list.h"
  17 #include "user_list.h"
  18
  19 static struct list_head user_list;
  20
  21 /*
  22  * lookup user in user list file. Fills in a user struct containing
  23  * filename of the user's public key as well as the permissions of that user.
  24  * Returns 1 on success, 0 if user does not exist and < 0 on errors.
  25  */
  26 static void populate_user_list(char *user_list_file)
  27 {
  28         FILE *file_ptr = NULL;
  29         char *char_ptr;
  30         char line[MAXLINE];
  31         /* keyword, user, key, perms */
  32         char w[MAXLINE], n[MAXLINE], k[MAXLINE], p[MAXLINE], tmp[4][MAXLINE];
  33         int num, ret;
  34
  35         file_ptr = fopen(user_list_file, "r");
  36         ret = -E_USERLIST;
  37         if (!file_ptr)
  38                 goto out;
  39         for (;;) {
  40                 struct user *u;
  41                 ret = para_fgets(line, MAXLINE, file_ptr);
  42                 if (ret < 0)
  43                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
  44                 if (ret <= 0)
  45                         break;
  46                 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
  47                         continue;
  48                 if (strcmp(w, "user"))
  49                         continue;
  50                 PARA_DEBUG_LOG("found entry for %s\n", n);
  51                 u = para_malloc(sizeof(struct user));
  52                 u->name = para_strdup(n);
  53                 ret = get_rsa_key(k, &u->rsa, LOAD_PUBLIC_KEY);
  54                 if (ret < 0)
  55                         break;
  56                 char_ptr = p;
  57                 num = sscanf(char_ptr, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
  58                         tmp[0], tmp[1], tmp[2], tmp[3]);
  59                 PARA_DEBUG_LOG("found %i perm entries\n", num);
  60                 u->perms = 0;
  61                 while (num > 0) {
  62                         num--;
  63                         if (!strcmp(tmp[num], "VSS_READ"))
  64                                 u->perms |= VSS_READ;
  65                         else if (!strcmp(tmp[num], "VSS_WRITE"))
  66                                 u->perms |= VSS_WRITE;
  67                         else if (!strcmp(tmp[num], "AFS_READ"))
  68                                 u->perms |= AFS_READ;
  69                         else if (!strcmp(tmp[num], "AFS_WRITE"))
  70                                 u->perms |= AFS_WRITE;
  71                         else /* unknown permission */
  72                                 PARA_WARNING_LOG("ignoring unknown permission: %s\n",
  73                                         tmp[num]);
  74                 }
  75                 para_list_add(&u->node, &user_list);
  76         }
  77 out:
  78         if (file_ptr)
  79                 fclose(file_ptr);
  80         if (ret >= 0)
  81                 return;
  82         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
  83         exit(EXIT_FAILURE);
  84 }
  85
  86 /**
  87  * initialize the list of users allowed to connecto to para_server
  88  *
  89  * \param user_list_file the file containing access information
  90  *
  91  * If this function is called a second time, the contents of the
  92  * previous call are discarded.
  93  */
  94 void init_user_list(char *user_list_file)
  95 {
  96         struct user *u, *tmp;
  97         static int initialized;
  98
  99         if (initialized) {
 100                 list_for_each_entry_safe(u, tmp, &user_list, node) {
 101                         list_del(&u->node);
 102                         free(u->name);
 103                         rsa_free(u->rsa);
 104                         free(u);
 105                 }
 106         } else
 107                 INIT_LIST_HEAD(&user_list);
 108         initialized = 1;
 109         populate_user_list(user_list_file);
 110 }
 111
 112 /**
 113  * lookup user in user_list.
 114  *
 115  * \param name of the user
 116  *
 117  * \return a pointer to the corresponding user struct if the user was found,
 118  *  \p NULL otherwise.
 119  */
 120 struct user *lookup_user(const char *name)
 121 {
 122         struct user *u;
 123         list_for_each_entry(u, &user_list, node) {
 124                 if (strcmp(u->name, name))
 125                         continue;
 126                 return u;
 127         }
 128         return NULL;
 129 }