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// Douglas Thrift |
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// |
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// CCS Computer Science |
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// |
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// Common Functions |
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|
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#include "common.h" |
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|
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int check(int value, jmp_buf environment) |
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{ |
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if (value == -1) |
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longjmp(environment, 1); |
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|
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return value; |
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} |
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|
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int regcheck(int value, const regex_t *regex, jmp_buf environment) |
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{ |
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if (value && value != REG_NOMATCH) |
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{ |
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char exception[regerror(value, regex, NULL, 0)]; |
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|
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regerror(value, regex, exception, sizeof (exception)); |
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longjmp(environment, (int)exception); |
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} |
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|
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return value; |
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} |
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|
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char *fcheck(char *value, FILE *stream, jmp_buf environment) |
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{ |
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if (!value) |
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{ |
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if (ferror(stream)) |
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longjmp(environment, 1); |
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else |
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{ |
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clearerr(stdin); |
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printf("\n"); |
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|
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return ""; |
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} |
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} |
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|
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return value; |
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} |
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|
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void authenticate(const char *program, jmp_buf environment) |
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{ |
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struct passwd *entry = getpwuid(getuid()); |
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|
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if (!entry) |
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longjmp(environment, 1); |
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|
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char name[strlen(entry->pw_name) + 36]; |
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|
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sprintf(name, "uid=%s,ou=People,dc=ccs,dc=ucsb,dc=edu", entry->pw_name); |
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umask(022); |
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|
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char *password = getpass("Password: "); |
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|
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if (!strlen(password)) |
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longjmp(environment, (int)"Empty password"); |
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|
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char secret[] = "/tmp/secret.XXXXXX"; |
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|
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putpassword(password, secret, environment); |
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|
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int pipe_[2]; |
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|
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check(pipe(pipe_), environment); |
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|
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pid_t ldapwhoami; |
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|
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if (!(ldapwhoami = check(fork(), environment))) |
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{ |
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check(dup2(pipe_[1], 1), environment); |
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check(close(pipe_[0]), environment); |
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check(execl("/usr/local/bin/ldapwhoami", program, "-D", name, "-W", "-x", "-y", secret, NULL), environment); |
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} |
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|
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check(close(pipe_[1]), environment); |
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|
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FILE *ldapwhoami_ = fdopen(pipe_[0], "r"); |
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size_t size; |
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char *whoami_ = fcheck(fgetln(ldapwhoami_, &size), ldapwhoami_, environment); |
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int status; |
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|
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check(waitpid(ldapwhoami, &status, 0), environment); |
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check(unlink(secret), environment); |
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|
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char whoami[size]; |
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|
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strlcpy(whoami, whoami_, size); |
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|
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whoami_ = malloc(sizeof (name) + 3); |
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|
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sprintf(whoami_, "dn:%s", name); |
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|
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if (strcmp(whoami, whoami_)) |
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longjmp(environment, (int)"Sorry"); |
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|
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free(whoami_); |
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} |
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|
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void getpassword(char password[_PASSWORD_LEN], jmp_buf environment) |
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{ |
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strcpy(password, getpass("New Password: ")); |
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|
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if (!strlen(password)) |
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longjmp(environment, (int)"Empty password"); |
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|
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if (strcmp(password, getpass("Confirm Password: "))) |
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longjmp(environment, (int)"Password and confirm password mismatched"); |
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} |
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|
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void putpassword(char password[_PASSWORD_LEN], char *name, jmp_buf environment) |
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{ |
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int file = check(mkstemp(name), environment); |
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|
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check(write(file, password, strlen(password)), environment); |
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check(close(file), environment); |
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} |
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|
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void get(const char *prompt, regex_t *regex, char **string, jmp_buf environment) |
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{ |
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do |
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{ |
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printf("%s: ", prompt); |
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|
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size_t size; |
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char *string_ = fcheck(fgetln(stdin, &size), stdin, environment); |
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|
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*string = *string ? realloc(*string, size) : malloc(size); |
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|
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strlcpy(*string, string_, size); |
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} |
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while (regcheck(regexec(regex, *string, 0, NULL, 0), regex, environment)); |
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} |
